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<strong>IgG</strong> <strong>Therapy</strong> <strong>for</strong> <strong>the</strong> <strong>Home</strong>-<strong>Based</strong> <strong>Patient</strong>: <strong>Administration</strong><br />

<strong>and</strong> Delivery Method Considerations<br />

By Hetty Lima, R.Ph., FASHP, <strong>and</strong> Amy Clarke, R.N.<br />

Adapted from <strong>the</strong> original April 26 presentation at <strong>the</strong> 2012 <strong>NHIA</strong> Annual Conference & Exposition<br />

Supported by an educational grant from CSL Behring


CE In<strong>for</strong>mation:<br />

Pharmacist<br />

This INFUSION article is cosponsored by Educational Review Systems (ERS), which is accredited by <strong>the</strong> Accreditation<br />

Council <strong>for</strong> Pharmacy Education (ACPE) as a provider of continuing pharmacy education. ERS has assigned<br />

1 contact hour (0.1 CEU) of continuing education credits to this article. Eligibility to receive continuing education<br />

credits <strong>for</strong> this article begins December 1, 2012 <strong>and</strong> expires November 20, 2015. The universal activity number<br />

<strong>for</strong> this program is 0761­9999­12­176­H01­P. Activity Type: Knowledge­<strong>Based</strong>.<br />

Dietitian<br />

CPE<br />

Accredited<br />

Provider<br />

Educational Review Systems (Provider number ED002) is a Continuing Professional Education (CPE)<br />

Accredited Provider with <strong>the</strong> Commission on Dietetic Registration (CDR). Registered dietitians (RDs) <strong>and</strong><br />

dietetic technicians, registered (DTRs) will receive 1 hour or 1 continuing professional education unit (CPEU)<br />

<strong>for</strong> completion of this program/material. Eligibility to receive continuing education credits <strong>for</strong> this article<br />

begins December 1, 2012 <strong>and</strong> expires November 30, 2014.<br />

Nurse<br />

Educational Review Systems is an approved provider of continuing nursing education by Alabama State<br />

Nurses Association (ASNA), an accredited approver of continuing nursing education by <strong>the</strong> American<br />

Nurses Credentialing Center, Commission on Accreditation. Program # 05­115­12­002.<br />

This program is approved <strong>for</strong> 1 hour of continuing nursing education. Eligibility to receive continuing education credits <strong>for</strong> this<br />

article begins December 1, 2012 <strong>and</strong> expires November 30, 2014. Educational Review Systems is also approved <strong>for</strong> nursing continuing<br />

education by <strong>the</strong> state of Cali<strong>for</strong>nia, <strong>the</strong> state of Florida, <strong>and</strong> <strong>the</strong> District of Columbia.<br />

This continuing education article is intended <strong>for</strong> pharmacists, nurses, dietitians, <strong>and</strong> o<strong>the</strong>r alternate­site infusion professionals. In<br />

order to receive credit <strong>for</strong> this program activity, participants must complete <strong>the</strong> online post­test <strong>and</strong> subsequent evaluation questions<br />

available at this link: www.nhia.org/CE_Infusion. Participants are allowed two attempts to receive a minimum passing score<br />

of 70%.<br />

Approval as a provider refers to recognition of educational activities only <strong>and</strong> does not imply Accreditation Council <strong>for</strong> Pharmacy<br />

Education, ERS, ANCC Commission on Accreditation, or Commission on Dietetic Registration approval or endorsement<br />

of any product.<br />

Educational Learning Objectives:<br />

After reading this article, <strong>the</strong> participant should be able to:<br />

1. Distinguish between <strong>the</strong> advantages <strong>and</strong> disadvantages of SCIG <strong>for</strong> home­based patients.<br />

2. Explain <strong>the</strong> differences in bioavailability <strong>and</strong> dosing strategy <strong>for</strong> IVIG versus SCIG.<br />

3. Describe <strong>the</strong> role of monitoring outcomes such as disease progression, frequency of infection, <strong>and</strong> days of school/work<br />

missed in clinical decision making.<br />

4. Enumerate <strong>the</strong> core elements of patient <strong>and</strong> caregiver education when transitioning a patient to self administration of<br />

SCIG <strong>the</strong>rapy.<br />

<strong>IgG</strong> <strong>Therapy</strong> <strong>for</strong> <strong>the</strong> <strong>Home</strong>­<strong>Based</strong> <strong>Patient</strong>: <strong>Administration</strong> <strong>and</strong> Delivery Method Considerations


Author Bios:<br />

Hetty Lima, R.Ph., FASHP, is <strong>the</strong> Vice President of Specialty Infusion<br />

<strong>and</strong> Rare Diseases at Diplomat Specialty Pharmacy in Flint,<br />

Michigan. An accomplished health care executive with more<br />

than 27 years of home infusion/specialty pharmacy experience,<br />

she has held executive leadership positions at providers such as<br />

Baxter Healthcare, CVS/Caremark’s Specialty Pharmacy division,<br />

<strong>and</strong> Coram’s Hemophilia Services division. A graduate of <strong>the</strong> University<br />

of Rhode Isl<strong>and</strong>, Lima is also <strong>the</strong> past President of <strong>the</strong><br />

American Society of Health­System Pharmacists’ (ASHP’s) Section<br />

of <strong>Home</strong> Care Practitioners. She has lectured at national <strong>and</strong><br />

international pharmacy <strong>and</strong> nursing meetings <strong>and</strong> has published<br />

extensively on <strong>the</strong> clinical <strong>and</strong> practical aspects of home infusion<br />

<strong>and</strong> specialty pharmacy. Her work has appeared in numerous<br />

pharmacy <strong>and</strong> nursing journals <strong>and</strong> pharmaceutical texts.<br />

Amy Clarke, R.N., is a registered nurse <strong>and</strong> has practiced in <strong>the</strong><br />

home infusion arena since 1994, as Director of Nursing <strong>for</strong> <strong>the</strong><br />

Chicago locations of Chartwell Diversified Services <strong>and</strong> Option<br />

Care’s <strong>Home</strong> Infusion <strong>Therapy</strong> Pharmacies. Clarke has provided clinical<br />

education on infusion <strong>the</strong>rapy <strong>and</strong> specialty medications to<br />

nursing staff (internal <strong>and</strong> external), pharmacists, physicians, <strong>and</strong><br />

social workers. She has presented continuing education presentations<br />

to some of <strong>the</strong> nation’s top payers including various Blue<br />

Cross Blue Shield plans, Humana, Aetna <strong>and</strong> United Healthcare.<br />

Clarke has a particular passion <strong>for</strong> immunoglobulin <strong>the</strong>rapy, having<br />

personally per<strong>for</strong>med over 1,500 IV <strong>and</strong> SC infusions to date.<br />

Working with home infusion pharmacy in <strong>the</strong> 1990s she observed<br />

that IVIG was not well understood by nursing staff, pharmacies,<br />

payers, <strong>and</strong> in many instances <strong>the</strong> physicians <strong>the</strong>mselves. She has<br />

developed multiple presentations on IVIG administration<br />

specifics, as well as <strong>the</strong> “ins <strong>and</strong> outs” of subcutaneous IG <strong>the</strong>rapy.<br />

Clarke has developed a successful national <strong>IgG</strong> program as<br />

Program Manager <strong>for</strong> Diplomat Specialty Pharmacy.<br />

AUTHOR DISCLOSURE STATEMENT:<br />

The authors declare no conflicts of interest or financial interest<br />

in any product or service mentioned in this program,<br />

including grants, employment, gifts, stock<br />

holdings, <strong>and</strong> honoraria. This article may include discussion<br />

of off­label/investigational drug use but in a fair <strong>and</strong><br />

unbiased manner. Hetty Lima <strong>and</strong> her sons use medications<br />

from <strong>the</strong> sponsoring organization (CSL Behring) to<br />

treat Von Willebr<strong>and</strong>’s Disease.<br />

<strong>IgG</strong> <strong>Therapy</strong> <strong>for</strong> <strong>the</strong> <strong>Home</strong>­<strong>Based</strong> <strong>Patient</strong>: <strong>Administration</strong> <strong>and</strong> Delivery Method Considerations 1


<strong>IgG</strong> Market Overview <strong>and</strong> Uses<br />

The <strong>IgG</strong> market has grown steadily over <strong>the</strong> past several<br />

years. In 2010, sales of intravenous <strong>IgG</strong> (IVIG) <strong>and</strong> subcutaneous<br />

<strong>IgG</strong> (SCIG) combined exceeded $2.8 billion. Approximately<br />

42.3 million grams of product was sold in 2010—an<br />

8% increase over <strong>the</strong> previous year. 1 Although <strong>IgG</strong> is by no<br />

means a major <strong>the</strong>rapeutic class in terms of payer drug<br />

spend, like chemo<strong>the</strong>rapy or rheumatology <strong>the</strong>rapies, it is<br />

gradually becoming a notable category. For a health plan<br />

with 1 million covered lives, approximately $16 million or<br />

about 6% of all claims will be <strong>for</strong> IVIG. 2<br />

Of <strong>the</strong> <strong>IgG</strong> that is used <strong>for</strong> FDA­approved indications, 36%<br />

is <strong>for</strong> <strong>the</strong> treatment of primary immunodeficiencies, 26% in<br />

hematology <strong>and</strong> oncology, 25% <strong>for</strong> neurological disorders,<br />

<strong>and</strong> 13% <strong>for</strong> miscellaneous indications. 1 However, it’s difficult<br />

to ascertain <strong>the</strong> true breakdown of <strong>the</strong> <strong>IgG</strong> market because<br />

a great deal of immune globulin is used <strong>for</strong> off­label<br />

indications. In 2009 <strong>the</strong> off­label usages <strong>for</strong> IVIG represented<br />

approximately 55% of prescribed product. 1 It’s important<br />

to note that although <strong>the</strong>se indications are not yet<br />

approved by <strong>the</strong> U.S. Food <strong>and</strong> Drug <strong>Administration</strong> (FDA),<br />

many indications are supported by peer­reviewed literature<br />

<strong>and</strong> are generally accepted <strong>for</strong> reimbursement by payers.<br />

See Exhibit 1 <strong>for</strong> a list of FDA­approved indications <strong>and</strong> offlabel<br />

uses.<br />

With more than 150 specific disease states falling under<br />

<strong>the</strong> umbrella of primary deficiency disorders, clinicians <strong>and</strong><br />

payers alike encounter challenges determining when <strong>and</strong><br />

<strong>for</strong> which patients <strong>IgG</strong> is most appropriate. A history of<br />

product shortages <strong>and</strong> growing dem<strong>and</strong> only serve to increase<br />

<strong>the</strong> pressures surrounding <strong>the</strong>se decisions. In 2006,<br />

<strong>the</strong> American Academy of Allergy, Asthma, <strong>and</strong> Immunology<br />

(AAAAI) conducted a literature review <strong>and</strong> issued evidencebased<br />

recommendations <strong>for</strong> efficient use of <strong>IgG</strong>, categorizing<br />

<strong>the</strong>m by <strong>the</strong> degree to which <strong>the</strong> <strong>the</strong>rapy was beneficial<br />

<strong>and</strong> <strong>the</strong> strength of <strong>the</strong> recommendation based on <strong>the</strong> available<br />

evidence. 3 This paper <strong>and</strong> o<strong>the</strong>r resources <strong>for</strong> clinicians<br />

are available in an online toolkit available at:<br />

http://www.aaaai.org/practice­resources/managementtools­<strong>and</strong>­technology/ivig­toolkit.aspx.<br />

The Emergence of SCIG<br />

The subcutaneous method of <strong>IgG</strong> (SCIG) administration has<br />

been an accepted practice in Sc<strong>and</strong>inavia <strong>and</strong> <strong>the</strong> United<br />

Kingdom <strong>for</strong> some time. Literature dating back 60 years, including<br />

<strong>the</strong> research of pioneering American physician<br />

Ogden Bruton, a pediatrician at Walter Reed Army Hospital,<br />

documents <strong>the</strong> safe <strong>and</strong> effective use of SCIG in a case of<br />

primary immune deficiency (PID) in an eight year old boy<br />

with X­lined agammaglobulinemia which is also known as<br />

“Bruton’s syndrome.” 4 In 1980, Berger <strong>and</strong> colleagues at <strong>the</strong><br />

National Institutes of Health reported using a portable syringe<br />

driver to administer <strong>IgG</strong> to three adult patients, concluding<br />

that <strong>the</strong> slow subcutaneous infusions were well<br />

Exhibit 1<br />

Uses <strong>for</strong> <strong>IgG</strong><br />

FDA­Approved Indications<br />

(as of November 2012)<br />

• Primary immunodeficiencies<br />

• Allogenic bone marrow/stem cell<br />

transplant<br />

• Chronic lymphocytic leukemia<br />

• Idiopathic thrombocytopenic<br />

purpura<br />

• Pediatric HIV<br />

• Kawasaki disease<br />

• Chronic inflammatory<br />

demyelinating polyneuropathy<br />

(CIDP)*<br />

• Kidney transplant, with a highantibody<br />

recipient or an<br />

ABO­incompatible donor<br />

Off­Label Uses—Neurological<br />

• Guillain­Barre syndrome<br />

• Multi­focal Motor Neuropathy<br />

• Multiple Sclerosis<br />

• Myas<strong>the</strong>nia Gravis (w/exacerbation)<br />

• Neuromyelitis Optica (Devic’s<br />

disease)<br />

• Stiff Person’s syndrome<br />

Off­Label Uses—O<strong>the</strong>r<br />

• Dermatomyositis<br />

• Infertility<br />

• Pediatric autoimmune<br />

neuropsychiatric disorders<br />

associated with Streptococcal<br />

infections (PANDAS)<br />

• Pemphigus<br />

• Polymyositis<br />

• Renal transplant<br />

• Scleroderma<br />

• Sjogren’s syndrome<br />

• Susac’s syndrome<br />

* Only Gamunex­C® <strong>and</strong> GammaKed® are approved at this time<br />

Source: Huber, A. Advanced Considerations <strong>for</strong> <strong>Home</strong> <strong>Administration</strong> of Immunoglobulin <strong>Therapy</strong>. <strong>NHIA</strong> Annual Conference<br />

& Exposition, April 2011, Orl<strong>and</strong>o, Florida.<br />

2<br />

<strong>IgG</strong> <strong>Therapy</strong> <strong>for</strong> <strong>the</strong> <strong>Home</strong>­<strong>Based</strong> <strong>Patient</strong>: <strong>Administration</strong> <strong>and</strong> Delivery Method Considerations


tolerated <strong>and</strong> noticeably free of adverse reactions. 5 This<br />

study paved <strong>the</strong> way <strong>for</strong> additional research in both adult<br />

<strong>and</strong> pediatric patients—largely with positive results. By<br />

1981, <strong>the</strong> safe <strong>and</strong> effective home administration of SCIG<br />

was first reported. 6 Subsequent studies reported similar success<br />

with varying rates of administration. 7,8,9<br />

Despite <strong>the</strong>se innovations, <strong>the</strong> subcutaneous (SC) method<br />

of <strong>IgG</strong> administration did not take hold in <strong>the</strong> U.S., largely due<br />

to <strong>the</strong> availability of IVIG <strong>and</strong> <strong>the</strong> fact that <strong>the</strong>re was no commercial<br />

product specifically <strong>for</strong>mulated <strong>for</strong> SC delivery. That<br />

changed in 2006, when <strong>the</strong> FDA approved <strong>the</strong> first <strong>IgG</strong> <strong>for</strong>mulation<br />

designed exclusively <strong>for</strong> subcutaneous administration. 10<br />

Since <strong>the</strong>n, three additional SCIG <strong>for</strong>mulations have been FDA<br />

approved <strong>for</strong> primary immunodeficiency—with o<strong>the</strong>rs currently<br />

in clinical trials. The subcutaneous administration of IVIG<br />

<strong>for</strong>mulations has also become more widespread.<br />

To date, few studies have been conducted to directly<br />

compare IVIG <strong>and</strong> SCIG. However, sufficient available research<br />

has shown that, due to its relatively stable bioavailability,<br />

SCIG is associated with fewer systemic adverse<br />

events. 11 In addition, this administration route offers a variety<br />

of advantages to patients who are willing to commit<br />

to self­administration.<br />

SCIG <strong>Patient</strong> Selection<br />

SCIG offers several advantages over intravenous administration.<br />

Chief among <strong>the</strong>m is a viable treatment alternative <strong>for</strong><br />

patients with limited vascular access or those who cannot tolerate<br />

<strong>the</strong> side effects commonly associated with IV administration.<br />

The slower administration <strong>and</strong> gradual absorption of SCIG<br />

eliminates rapid, large variances in serum <strong>IgG</strong> levels, which reduces<br />

adverse affects, such as migraines, <strong>and</strong> <strong>the</strong> need to premedicate<br />

prior to infusion. In addition, consistent serum levels<br />

achieved through this <strong>the</strong>rapy modality eliminate low trough<br />

levels, <strong>the</strong>reby reducing associated symptoms, such as extreme<br />

fatigue, joint pain, swelling, <strong>and</strong> malaise. 11<br />

SCIG also offers greater flexibility <strong>and</strong> patient autonomy. Although<br />

<strong>the</strong> fractionated doses require weekly—or more frequent—infusions,<br />

patients often enjoy <strong>the</strong> flexibility of being<br />

SCIG at a Glance<br />

Advantages<br />

• No IV access necessary<br />

• Fewer systemic side effects, no need to premedicate<br />

• Fewer systemic effects resulting from peak <strong>and</strong><br />

trough variability<br />

• <strong>Patient</strong> flexibility/autonomy<br />

Disadvantages of SCIG<br />

• Requires commitment <strong>and</strong> compliance<br />

• Not appropriate <strong>for</strong> large volume <strong>the</strong>rapies or very<br />

lean patients<br />

• Requires more frequent infusions<br />

• Local infusion reactions can occur<br />

<strong>IgG</strong> <strong>Therapy</strong> <strong>for</strong> <strong>the</strong> <strong>Home</strong>­<strong>Based</strong> <strong>Patient</strong>: <strong>Administration</strong> <strong>and</strong> Delivery Method Considerations 3


able to per<strong>for</strong>m <strong>the</strong>ir own infusions, at home when it’s convenient,<br />

without having to travel to <strong>and</strong> from a treatment center.<br />

A 2010 study showed that patients preferred SCIG over IVIG<br />

<strong>the</strong>rapy (92%) <strong>and</strong> home <strong>the</strong>rapy over <strong>the</strong>rapy at <strong>the</strong><br />

clinic/physician (83%). 12<br />

Un<strong>for</strong>tunately, patients requiring higher <strong>IgG</strong> doses, such as<br />

those with autoimmune diseases, may not be appropriate<br />

c<strong>and</strong>idates <strong>for</strong> SCIG <strong>the</strong>rapy due to <strong>the</strong> large volume of fluid<br />

that would need to be delivered. This is especially true <strong>for</strong> patients<br />

on <strong>for</strong>mulations with comparatively lower­concentration<br />

<strong>IgG</strong> (i.e. 10% vs 16% or 20%). Similarly, patients who are<br />

very lean may not be suitable c<strong>and</strong>idates <strong>for</strong> SCIG because<br />

<strong>the</strong>y often have limited appropriate sites <strong>for</strong> SC access.<br />

For SCIG to be successful, patients <strong>and</strong> caregivers must<br />

be committed to learning <strong>and</strong> adapting to self­care. They<br />

should also have a demonstrated history of <strong>the</strong>rapy compliance.<br />

Independence is typically achieved after two to four<br />

nurse teaching visits with continued clinical monitoring <strong>and</strong><br />

patient follow­up.<br />

Dosing <strong>and</strong> Conversion to SCIG<br />

Several studies demonstrate favorable improvement in infection<br />

rates, hospital admissions, <strong>and</strong> overall morbidity <strong>for</strong> patients<br />

on SCIG. 7,13­16 But, how much <strong>IgG</strong> is needed to achieve<br />

<strong>the</strong>se results, <strong>and</strong> what is <strong>the</strong> best dosing strategy <strong>for</strong> patients<br />

just starting SCIG <strong>the</strong>rapy <strong>and</strong>/or converting from IVIG?<br />

Not all patients respond <strong>the</strong> same way to <strong>the</strong> many <strong>IgG</strong> <strong>for</strong>mulations<br />

on <strong>the</strong> market. Differences in pH, osmolarity,<br />

amount of sucrose, <strong>and</strong> amount of IgA, make product selection<br />

very individualized. Similarly, <strong>the</strong>re is no cookie cutter<br />

<strong>for</strong>mula <strong>for</strong> dosing—although higher doses are beginning to<br />

be supported in <strong>the</strong> literature as offering improved clinical<br />

benefits <strong>and</strong> quality of life <strong>for</strong> patients. 17<br />

Unlike IVIG, SCIG doesn’t immediately enter <strong>the</strong> circulatory<br />

system during administration. For this reason, it has a<br />

lower systemic bioavailability <strong>and</strong> more stable serum levels<br />

following administration. Weekly administration of SCIG<br />

leads to stable steady­state serum <strong>IgG</strong> levels with lower<br />

peak levels <strong>and</strong> higher trough levels compared to monthly<br />

IVIG treatment (see Exhibit 2). The FDA recognized this difference<br />

<strong>and</strong> adjusted dosing to achieve a similar “area under<br />

<strong>the</strong> curve” (AUC) by using a product­specific multiplier <strong>for</strong><br />

calculating dosages. Formulas <strong>for</strong> converting IVIG doses are<br />

provided in package inserts <strong>and</strong> available from <strong>IgG</strong> manufacturers<br />

online (see Exhibit 3).<br />

The optimal dose of <strong>IgG</strong> <strong>for</strong> primary immune deficiency was<br />

considered to be 400­800 mg/kg/month (100­200<br />

mg/kg/week <strong>for</strong> SCIG) with <strong>the</strong> goal of achieving serum levels<br />

of 500 mg/dL or greater. 18,19 But, in 2006, <strong>the</strong> PID Committee<br />

of <strong>the</strong> AAAAI issued a report in which it asserted that <strong>the</strong><br />

dose of <strong>IgG</strong> should be titrated to achieve a trough level<br />

greater than 500 mg/dL in agammaglobulinemic patients <strong>and</strong><br />

that trough levels greater than 800 mg/dL have <strong>the</strong> potential<br />

to improve pulmonary outcomes. 3 This was fur<strong>the</strong>r demonstrated<br />

in a 2010 meta­analysis of PIDD patients on IVIG <strong>the</strong>rapy<br />

<strong>and</strong> experiencing pneumonia, whose rates of infection<br />

were reduced by increasing <strong>the</strong> <strong>IgG</strong> trough levels to mid­normal<br />

range (1,000 mg/dL). 17 A subsequent study, published in<br />

2012, examined a broader set of outcomes <strong>and</strong> also favored<br />

higher doses of <strong>IgG</strong>. Researchers comparing results from two<br />

parallel clinical studies found that PIDD patients who maintained<br />

a higher mean <strong>IgG</strong> dose (1.5 times higher) had significantly<br />

lower rates of non­serious infections, hospitalization,<br />

antibiotic use, <strong>and</strong> missed work/school activity. In addition,<br />

<strong>the</strong> higher­dose group experienced lower health care utiliza­<br />

Exhibit 2<br />

Subcutaneous Versus Intravenous<br />

Serum Ig levels<br />

Total <strong>IgG</strong><br />

1600<br />

1400<br />

1200<br />

1000<br />

800<br />

600<br />

400<br />

Intravenous Ig<br />

Subcutanenous Ig<br />

0 2 4 6 8 10 12 14 16 18 20 22<br />

Days<br />

Source: P&T Product Profiler – Hizentra Vol. 35, Issue 8 /<br />

August 2010 Section 2 / adapted from Berger 2004. Available<br />

at http://www.ptcommunity.com/ptjournal/fulltext/Profiler_Hizentra/Profiler_Hizentra.pdf<br />

Exhibit 3<br />

FDA-Recommended Dose Conversion<br />

<strong>for</strong> SCIG<br />

• 20% products = IVIG dose (g) x 1.53 / number of<br />

weeks between doses<br />

• 10% products = IVIG dose (g) x 1.37 / number of<br />

weeks between doses<br />

4<br />

<strong>IgG</strong> <strong>Therapy</strong> <strong>for</strong> <strong>the</strong> <strong>Home</strong>­<strong>Based</strong> <strong>Patient</strong>: <strong>Administration</strong> <strong>and</strong> Delivery Method Considerations


tion <strong>and</strong> improved indices of well­being compared to <strong>the</strong><br />

group treated with traditional <strong>IgG</strong> doses. 18<br />

Many clinicians now believe that <strong>the</strong> mean dose adjustment<br />

coefficient <strong>and</strong> <strong>the</strong> mean trough level ratio should only<br />

be used as rough guides in dosing. As additional outcomes,<br />

such as slowing of disease progression, frequency of infection,<br />

days of work/school missed, etc., are considered, experienced<br />

clinicians are tending toward higher doses while<br />

relying on patient monitoring to adjust <strong>the</strong>rapeutic levels of<br />

<strong>IgG</strong>. In a survey of immunologists, those with more in­depth<br />

experience—more than 10% of <strong>the</strong>ir practice was devoted<br />

to PID patients—were significantly more likely to target<br />

higher serum levels (above 750 mg/dL); whereas those with<br />

fewer than 10% PID patients usually targeted lower serum<br />

levels (500­750 mg/dL). 20<br />

<strong>Home</strong> infusion <strong>and</strong> specialty pharmacy providers can play a<br />

critical role in patient monitoring by collecting supporting documentation<br />

on <strong>the</strong> <strong>the</strong>rapeutic effectiveness of <strong>IgG</strong> regimens<br />

from a variety of perspectives, including: response to <strong>the</strong>rapy,<br />

abatement of symptoms, <strong>and</strong> quality of life. This data provides<br />

meaningful feedback <strong>for</strong> physicians working to find each patient’s<br />

dosing “sweet spot,” <strong>and</strong> also aids in building a case <strong>for</strong><br />

reimbursement, especially if <strong>the</strong> patient’s recommended<br />

dosage falls outside <strong>the</strong> “normal” payer guidelines.<br />

SCIG <strong>Administration</strong><br />

SCIG administration presents some unique challenges from<br />

a clinical perspective. With <strong>the</strong> medication itself, volume <strong>and</strong><br />

viscosity are key factors in care planning. The <strong>the</strong>rapy also<br />

involves a different—but similar—set of supplies than those<br />

used to administer IVIG.<br />

For example, <strong>the</strong> home infusion/specialty pharmacy care<br />

team should map out a regimen based on <strong>the</strong> prescribed dosing<br />

parameters. They need to consider <strong>the</strong> individual patient<br />

<strong>and</strong> total volume of <strong>the</strong>rapy to determine <strong>the</strong> number of fractionations<br />

<strong>and</strong> sites to be infused with each administration.<br />

As a rule of thumb, infusions should last 45­50 minutes, <strong>and</strong><br />

should not be longer than 90 minutes. Generally, no more<br />

than 15 mL should be administered in any one site. In order<br />

to limit swelling, a rate of 20 mL/hour is suggested <strong>for</strong> rapid<br />

infusions; 4 mL/hour is suggested <strong>for</strong> longer infusions. 11<br />

SCIG is viscous—much more so than <strong>the</strong> sterile water used<br />

to calibrate typical IV administration rates—so tubing sets<br />

need to be adjusted to achieve <strong>the</strong> desired rate. For example,<br />

pumps <strong>and</strong> tubing may need to be set at 600 mL/hr to deliver<br />

20 mL/hr to <strong>the</strong> patient. There are several infusion pumps<br />

<strong>and</strong> needles specifically designed <strong>for</strong> SC administration—<br />

some pumps use only proprietary sets. Many pump manufacturers<br />

offer sample supply lists online to prompt pharmacy<br />

<strong>IgG</strong> <strong>Therapy</strong> <strong>for</strong> <strong>the</strong> <strong>Home</strong>­<strong>Based</strong> <strong>Patient</strong>: <strong>Administration</strong> <strong>and</strong> Delivery Method Considerations 5


Hot packs, which cause vasodilatation, can trigger a similar<br />

reaction, <strong>and</strong> should be avoided. However, cold is an effective<br />

tool in preventing site reactions <strong>and</strong> slightly numbing<br />

<strong>the</strong> area prior to needle insertion. Many providers advise<br />

patients to use freezer packs or even place flat rocks in <strong>the</strong><br />

freezer <strong>for</strong> chilling an injection site prior to administration.<br />

Topical steroids <strong>and</strong> histamine blockers are also effective in<br />

reducing minor site reactions.<br />

Regardless of <strong>the</strong> route of administration, <strong>IgG</strong> <strong>the</strong>rapy<br />

is <strong>the</strong> inoculation of a protein­based substance into <strong>the</strong><br />

body. There<strong>for</strong>e, adverse reactions similar to those reported<br />

with o<strong>the</strong>r <strong>IgG</strong> administration methods may also<br />

occur. While <strong>the</strong> most frequent adverse reaction is a<br />

local reaction at <strong>the</strong> injection site, Exhibit 4 lists o<strong>the</strong>r<br />

adverse reactions reported in clinical studies as a percentage<br />

of subcutaneous administrations <strong>for</strong> one <strong>for</strong>mulation<br />

of SCIG. 21<br />

Preparing <strong>the</strong> <strong>Patient</strong> <strong>for</strong> SCIG <strong>Therapy</strong><br />

As mentioned previously, patients who take on self­administration<br />

must be willing to undergo appropriate training.<br />

<strong>Patient</strong>s <strong>and</strong> caregivers are taught administration techniques<br />

via h<strong>and</strong>s­on instruction from a nurse, <strong>and</strong> asked to<br />

return demonstrate successfully be<strong>for</strong>e independently per<strong>for</strong>ming<br />

self­infusion.<br />

Exhibit 4<br />

Adverse Reactions <strong>for</strong> SCIG<br />

ordering. It should also be noted that a growing number of<br />

prescribers prefer IV push administration, which is lower­tech<br />

but also reduces supply costs.<br />

While rotating injection sites is a st<strong>and</strong>ard best practice <strong>for</strong><br />

most <strong>the</strong>rapies, this is not <strong>the</strong> case <strong>for</strong> SCIG. After a few administrations,<br />

subcutaneous pockets can accept <strong>the</strong> <strong>IgG</strong> more<br />

readily without triggering an antibody reaction. Most SCIG<br />

patients use <strong>the</strong> same sites repeatedly, or alternate every<br />

o<strong>the</strong>r use. It’s also important to note that inadvertent intradermal<br />

injection of <strong>IgG</strong> could cause <strong>the</strong> release of mediators<br />

resulting in an adverse reaction via complement activation. 11<br />

The best way to avoid this is to be sure that <strong>the</strong> needle length<br />

is appropriate <strong>for</strong> <strong>the</strong> individual patient <strong>and</strong> injection site.<br />

Adverse Reaction<br />

(n=3,656 infusions)<br />

Injection site reactions 49%<br />

Non­injection site reactions<br />

• Headache 1.6%<br />

• Rash 0.2%<br />

• Nausea 0.2%<br />

• Nervousness 0.1%<br />

• As<strong>the</strong>nia 0.1%<br />

• Skin disorder 0.1%<br />

• Urine abnormality 0.1%<br />

• Fever 0.1%<br />

• Dyspnea 0.1%<br />

• Gastrointestinal pain 0.1%<br />

• Tachycardia 0.1%<br />

Frequency<br />

Source: ZLB Behring. Immune Globulin Subcutaneous<br />

(Human) Vivaglobin Prescribing in<strong>for</strong>mation, January<br />

2006.<br />

6<br />

<strong>IgG</strong> <strong>Therapy</strong> <strong>for</strong> <strong>the</strong> <strong>Home</strong>­<strong>Based</strong> <strong>Patient</strong>: <strong>Administration</strong> <strong>and</strong> Delivery Method Considerations


The primary driver in <strong>the</strong> success of that educational ef<strong>for</strong>t is<br />

being sure that <strong>the</strong> patient knows what to expect. The home<br />

infusion care team should create a care plan that details <strong>the</strong><br />

number of infusions per week/month <strong>the</strong> patient will have, an<br />

estimated time <strong>for</strong> each infusion, <strong>the</strong> volume being infused, <strong>and</strong><br />

<strong>the</strong> number of sites accessed. This in<strong>for</strong>mation—along with a<br />

set of supplies, written instructions, <strong>and</strong> pharmacy contact in<strong>for</strong>mation—should<br />

be supplied prior to <strong>the</strong> teaching visit.<br />

Typically, patients <strong>and</strong>/or caregivers can become independent<br />

in as few as two or three teaching visits (see Exhibit<br />

5). During <strong>the</strong> first visit, <strong>the</strong> nurse per<strong>for</strong>ms <strong>the</strong> entire administration,<br />

explaining each step as <strong>the</strong> patient observes.<br />

There should be time <strong>for</strong> <strong>the</strong> patient to ask questions <strong>and</strong><br />

get acquainted with <strong>the</strong> many various supplies. The second<br />

visit is a t<strong>and</strong>em administration with <strong>the</strong> patient per<strong>for</strong>ming<br />

<strong>the</strong> majority of <strong>the</strong> tasks with verbal cues from <strong>the</strong> nurse.<br />

The nurse may per<strong>for</strong>m certain tasks, such as <strong>the</strong> needlestick.<br />

By <strong>the</strong> third visit, <strong>the</strong> patient should be able to per<strong>for</strong>m<br />

all of <strong>the</strong> tasks with only minimal cuing from <strong>the</strong> nurse. If<br />

<strong>the</strong> patient or caregiver is not fully independent, more visits<br />

may be offered. Additional support, such as phone assistance<br />

<strong>and</strong> access to manufacturer teaching materials, may<br />

also be offered.<br />

Ano<strong>the</strong>r critical element <strong>for</strong> success is regular follow­up.<br />

Phone calls to check on patient progress <strong>and</strong> answer questions<br />

aid in compliance <strong>and</strong> help patients avoid complications<br />

that can sometimes arise from lapses in technique.<br />

<strong>Patient</strong>s should be made aware of what to expect during<br />

SCIG administration. Typically, <strong>the</strong> first several infusions result<br />

in a stretching, burning, tingling feeling at <strong>the</strong> injection site.<br />

This sensation usually disappears after <strong>the</strong> tissue in <strong>and</strong> around<br />

subcutaneous space becomes sensitized. <strong>Patient</strong>s may continue<br />

to experience sunburn­like redness <strong>and</strong> swelling at <strong>the</strong><br />

injection site <strong>and</strong> a “goose egg” reservoir of fluid in <strong>the</strong> subcutaneous<br />

space, due to <strong>the</strong> volume of infusion. These fluid pockets<br />

generally disappear within 6 ­ 24 hours as <strong>the</strong> fluid is<br />

absorbed into <strong>the</strong> body. It’s common <strong>for</strong> patients to feel tenderness<br />

<strong>and</strong>/or discom<strong>for</strong>t at <strong>the</strong> infusion site 12 ­ 24 hours following<br />

administration; counsel <strong>the</strong>m to choose activities <strong>and</strong><br />

even clothing appropriately. <strong>Patient</strong>s may also experience<br />

bruising 5 ­ 10 days after an infusion, <strong>and</strong> should know not to<br />

be alarmed by <strong>the</strong> delayed appearance of bruising.<br />

Exhibit 5<br />

Core Elements of <strong>Patient</strong> Education<br />

• <strong>Therapy</strong> regimen. The patient’s lifestyle must accommodate more frequent (weekly vs. monthly) administrations.<br />

<strong>Patient</strong>s must also underst<strong>and</strong> that compliance with an independent self administration schedule is essential to<br />

good outcomes.<br />

• Anaphylaxis procedures. Review epinephrine auto­injector use <strong>and</strong> storage procedures in <strong>the</strong> event of an anaphylactic<br />

reaction.<br />

• H<strong>and</strong> hygiene. Proper h<strong>and</strong> hygiene is a core element in all effective infection control programs, including in <strong>the</strong> patient’s<br />

home.<br />

• Site selection <strong>and</strong> preparation. <strong>Patient</strong>s should be involved in determining which site(s) to use <strong>for</strong> infusion based<br />

on com<strong>for</strong>t, body mass, convenience, etc. They should also be counseled on how to recognize improper needle<br />

length <strong>for</strong> <strong>the</strong> site used (i.e. A needle that is too long may brush muscle wall causing bruising <strong>and</strong> discom<strong>for</strong>t, or a<br />

needle that is too short can infuse intradermally, increasing <strong>the</strong> severity of local infusion site reactions.)<br />

• Supplies. <strong>Patient</strong>s should receive a list with all <strong>the</strong> supplies needed <strong>for</strong> <strong>the</strong>ir care along with storage/h<strong>and</strong>ling instructions.<br />

Inventory awareness <strong>and</strong> appropriateness should also be stressed with patients during <strong>the</strong> training<br />

phase, as <strong>the</strong>y will be expected to assist <strong>the</strong>ir pharmacy with <strong>the</strong>ir supply needs <strong>and</strong> should know how to communicate<br />

supply <strong>and</strong> usage needs.<br />

• Priming needles. <strong>Patient</strong>s should be instructed that all ef<strong>for</strong>t should be taken to insert a dry needle so that <strong>IgG</strong> is<br />

not being tracked through <strong>the</strong> dermis, triggering a possible histamine release <strong>and</strong> increasing <strong>the</strong> probability of a<br />

local site reaction.<br />

• Needlestick procedure. Teach patients to insert <strong>the</strong> needle into <strong>the</strong> subcutaneous space <strong>and</strong> how to avoid intradermal<br />

injection. Proper placement of <strong>the</strong> needles limits leaking, discom<strong>for</strong>t, <strong>and</strong> localized site reactions. Also teach<br />

90­degree angle insertion, avoiding scars, skin folds, or keloids.<br />

• Needle Securement: Apply tape over <strong>the</strong> needle in a chevron pattern to hold it securely in place during <strong>the</strong> infusion,<br />

minimizing <strong>the</strong> risk of dislodgement <strong>and</strong> subsequent intradermal infusion.<br />

• Disposal of trash <strong>and</strong> medical waste. Instruct patients on state <strong>and</strong> local regulations <strong>and</strong> to have appropriate<br />

garbage receptacle ready be<strong>for</strong>e <strong>the</strong> administration procedure begins.<br />

• Adverse reactions. While local site reactions are <strong>the</strong> most common, patients should also be educated regarding <strong>the</strong><br />

rare risks of aseptic meningitis, renal compromise, <strong>and</strong> cardiac compromise – particularly if <strong>the</strong>re is comorbidity.<br />

• Troubleshooting. Caution patients that <strong>the</strong> use of heating pads may increase a histamine response. Icing with a<br />

cold water bottle be<strong>for</strong>e needle placement minimizes pain <strong>and</strong> can enhance com<strong>for</strong>t. Chronic leaking or redness at<br />

<strong>the</strong> site should be a sign <strong>for</strong> <strong>the</strong> patient to discuss <strong>the</strong> needle length <strong>and</strong>/or pretreatment with <strong>the</strong>ir clinician.<br />

<strong>IgG</strong> <strong>Therapy</strong> <strong>for</strong> <strong>the</strong> <strong>Home</strong>­<strong>Based</strong> <strong>Patient</strong>: <strong>Administration</strong> <strong>and</strong> Delivery Method Considerations 7


It’s important that patients are educated about <strong>the</strong><br />

types of adverse reactions associated with SCIG <strong>and</strong> how<br />

to recognize <strong>the</strong>m. Symptoms, such as warmth, redness,<br />

<strong>and</strong> itching may be associated with a less­serious site reaction<br />

<strong>and</strong> may be resolved by working with <strong>the</strong>ir clinical<br />

team to strategize a pre­treatment plan or re­examine<br />

needle length, administration procedure, or o<strong>the</strong>r variables.<br />

See <strong>the</strong> “SCIG <strong>Administration</strong>” section on page 5<br />

<strong>for</strong> more in<strong>for</strong>mation.<br />

Case Study<br />

Converting IVIG patient to SCIG<br />

Mr. D was a 46­year­old male with CIPD. He<br />

was experiencing pain <strong>and</strong> decreased<br />

strength in his lower extremities. For four<br />

years, he had been receiving <strong>the</strong> same IVIG<br />

<strong>for</strong>mulation (off­label) at an infusion center.<br />

To be treated, he needed to travel 60 minutes<br />

(each way) monthly, in addition to wait<br />

<strong>and</strong> infusion time at <strong>the</strong> hospital­based infusion<br />

clinic.<br />

Following his infusions, he experienced<br />

severe chronic reactions, including migraine,<br />

vomiting, <strong>and</strong> flu­like symptoms<br />

<strong>and</strong> was bed­ridden <strong>for</strong> up to three days<br />

post­infusion. Overall, his disease state<br />

was poorly controlled <strong>and</strong> his quality of life<br />

was greatly diminished.<br />

The specialty infusion team worked with<br />

Mr. D’s physician to find an alternative IVIG<br />

<strong>for</strong>mulation that might reduce <strong>the</strong> side effects<br />

Actual patient not shown. Photo courtesy of Melvin Berger, M.D. <strong>and</strong> CSL Behring<br />

he was experiencing. The team educated <strong>the</strong><br />

physician on recognizing patient­specific product<br />

intolerances as well as rate­related side effects<br />

that can be abated by using a st<strong>and</strong>ard IVIG infusion rate (which <strong>the</strong> center was not doing).<br />

Mr. D successfully switched to a different IVIG product without incident <strong>and</strong> received his infusions at home. His infusion<br />

reactions resolved—he was no longer bedbound <strong>for</strong> three days with flu­like symptoms each month—<strong>and</strong> his trips to <strong>the</strong><br />

infusion center were also eliminated which conservatively saved his payer $20,000 per year in infusion suite costs. Mr. D<br />

also reported decreased pain in his limbs <strong>and</strong> neck.<br />

Mr. D <strong>the</strong>n expressed his desire to move to SCIG in order to become even more autonomous. He converted successfully<br />

after three nurse­teaching visits, <strong>and</strong> reports having improved energy levels <strong>and</strong> quality of life. He has regular monthly<br />

assessments with his physician, <strong>and</strong> <strong>the</strong> specialty pharmacy infusion team follows his progress.<br />

Subcutaneous immune globulin <strong>the</strong>rapy offers a safe, less invasive alternative to intravenous IG <strong>the</strong>rapy to those patients<br />

<strong>and</strong> caregivers willing to self­administer in <strong>the</strong> home setting.<br />

8<br />

<strong>IgG</strong> <strong>Therapy</strong> <strong>for</strong> <strong>the</strong> <strong>Home</strong>­<strong>Based</strong> <strong>Patient</strong>: <strong>Administration</strong> <strong>and</strong> Delivery Method Considerations


References<br />

1. Marketing Research Bureau, Inc. The plasma proteins market<br />

in <strong>the</strong> U.S. July 2011; 28(12):168. Available at http://www.marketingresearchbureau.com/IBPN_July2011.pdf<br />

(accessed on<br />

10/29/2012).<br />

2. Icore Healthcare. Medical pharmacy <strong>and</strong> oncology trend<br />

report, 2 nd edition. 2011:38. Available at:<br />

http://www.icorehealthcare.com/icore­util/trend­report­download.aspx/<br />

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3. Orange J, Hossny E, Weiler C, et al. Use of intravenous<br />

immunoglobulin in human disease: A review of evidence<br />

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Immunology. J Allergy Clin Immunol.2006;117(4):S525­<br />

553. Available at: www.aaaai.org/Aaaai/media/MediaLibrary/PDF%20Documents/Practice%20Resources/2006_i<br />

vig_evidence_review.pdf (accessed 10/29/2012).<br />

4. Bruton OC. Agammaglobulinemia. Pediatrics.<br />

1952.Jun;9(6):722­8.<br />

5. Berger M, Cupps TR, Fauci AS. Immunoglobulin replacement<br />

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Med.1980;93(1):55­56.<br />

6. van der Meer JWN, van Furth R. Rood JJ. Subcutaneous<br />

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Immuno<strong>the</strong>rapy: a guide to immunoglobulin prophylaxis<br />

<strong>and</strong> <strong>the</strong>rapy. London:Academic Press, 1981:133­42.<br />

7. Gardulf A, Hammarstrom L, Smith C.I.E. <strong>Home</strong> treatment<br />

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gammaglobulin by rapid infusion. Lancet.<br />

1991;338(8760):162­166.<br />

8. Gardulf A, Andersen V. Bjork<strong>and</strong>er J. et al. Subcutaneous<br />

immunoglobulin replacement in patients with primary<br />

antibody deficiencies: safety <strong>and</strong> costs. Lancet.<br />

1995;345:365­9<br />

9. Welch MJ, Stiehm ER. Slow subcutaneous immunoglobulin<br />

<strong>the</strong>rapy in a patient with reactions to intramuscular<br />

immunoglobulin. J Clin Immunol. 1983;3(3):285­286.<br />

10. FDA. Approval letter <strong>for</strong> Vivaglobin. January 9, 2006.<br />

Available at: http://www.fda.gov/BiologicsBloodVaccines/BloodBloodProducts/ApprovedProducts/LicensedProductsBLAs/FractionatedPlasmaProducts/ucm<br />

070367.htm (accessed 10/29/2012).<br />

11. Berger, M. Subcutaneous immunoglobulin replacement<br />

in primary immune deficiencies.J Clin Immunol.2004;112:1­7.<br />

12. Hoffmann F, Grimbacher B, Thiel J, et al. <strong>Home</strong>­based subcutaneous<br />

immunoglobulin G replacement <strong>the</strong>rapy under<br />

real­life conditions in children <strong>and</strong> adults with antibody deficiency.Eur<br />

J Med Res.2010 Jun 28; 15(6) :238­45.<br />

13. Gasper, Gerritsen, Jones. Immunoglobulin treatment by<br />

rapid subcutaneous infusion, Arch Dis Child 79(1998);48­51.<br />

14. Chapel HM, Spickett GP, Ericson D, Engl W, Eibl MM,<br />

Bjork<strong>and</strong>er J. The comparison of <strong>the</strong> efficacy <strong>and</strong> safety<br />

of intravenous versus subcutaneous immunoglobulin<br />

replacement <strong>the</strong>rapy. J Clin Immunol.2000;20(2):94­100.<br />

15. Ugazio AG, Duse M, Re R, Mangili G, Burgio GR. Subcutaneous<br />

infusion of gammaglobulins in management of<br />

agammaglobulinaemia. Lancet.1982;1(8265):226.<br />

16. Gardulf A, Bjorvell H, Gustafson R, Hammarstrom L,<br />

Smith CI. Safety of rapid subcutaneous gammaglobulin<br />

infusions in patients with primary antibody deficiency.<br />

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17. Orange JS, Grossman WJ, Navickis RJ, <strong>and</strong> Wilkes MM.<br />

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subcutaneous <strong>IgG</strong> reduce resource utilization in patients<br />

with primary immunodeficiency. J Clin Immunol.<br />

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setting.INFUSION.2006.12(3):S1­S8.<br />

20. Yong PL, Boyle J, Ballow M, Boyle M, Berger M, Blessing<br />

J, et al. Use of intravenous immunoglobulin <strong>and</strong> adjunctive<br />

<strong>the</strong>rapies in <strong>the</strong> treatment of primary immunodeficiencies:<br />

a working group report of <strong>and</strong> study by <strong>the</strong><br />

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Supplement to INFUSION, November/December 2012<br />

(Vol. 18, No. 6)<br />

<strong>IgG</strong> <strong>Therapy</strong> <strong>for</strong> <strong>the</strong> <strong>Home</strong>­<strong>Based</strong> <strong>Patient</strong>: <strong>Administration</strong> <strong>and</strong> Delivery Method Considerations


National <strong>Home</strong> Infusion Association • 703.549.3740 • www.nhia.org • info@nhia.org

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