Surgery and Healing in the Developing World - Dartmouth-Hitchcock
Surgery and Healing in the Developing World - Dartmouth-Hitchcock Surgery and Healing in the Developing World - Dartmouth-Hitchcock
15 134 Surgery and Healing in the Developing World sudden expulsion when resistance of the perineum is overcome results in lacerations. Do not make more than three attempts at vacuum-assisted delivery. If possible, attempt vacuum-assist in the OR so the patient can go immediately to section if extraction fails. Symphysiotomy Definition and Indications Symphysiotomy (separating the pubic symphysis to increase pelvic diameters) deserves discussion as an alternative to Cesarean section for the relief of obstructed labor that is due to mild or moderate cephalopelvic disproportion (CPD). This procedure is not in the armamentarium of obstetricians in the developed world but may yet have a limited place in the mission setting. For example, one might consider symphysiotomy as an emergency procedure when clinical pelvimetry suggests that an obstructed labor pattern is due to mild CPD, and Cesarean section would be difficult or dangerous under existing conditions. Among the advantages of the procedure one can count the facts that there will be no need for abdominal surgery and no uterine scar. Future deliveries should be much easier. The chief indication for symphysiotomy—failure to make progress in labor, associated with CPD with the head too high for vacuum-assist (or after vacuum-assist has failed)—presupposes that adequate clinical pelvimetry and Leopold’s assessment have been completed to support the diagnosis of CPD. The procedure is contraindicated in severe CPD. A Cesarean is the patient’s only option in this case. It is also inappropriate in the setting of malpresentations with one exception. It may be useful to release the aftercoming head in a difficult breech delivery. It may also be contraindicated by maternal body habitus, e.g., obesity and/or musculoskeletal abnormalities of the legs and/or spine. It won’t enable you to deliver a macrosomic fetus. Perform a vaginal exam to assess the degree of cervical dilatation and the station and position of the presenting part (which must be the head!). Symphysiotomy is performed at full dilatation and is always accompanied by an episiotomy. If the head has descended such that 1/5 or less is above the pelvic brim, you should be able to deliver the baby without symphysiotomy. If the head has stopped descending with 2/5 above the brim this is an indication for symphysiotomy. With 3/5 of the head above the brim, King et al recommend the following assessment: attempt to pass a finger between the head and the pelvis. If you are unable to, the CPD is too great for symphysiotomy to be useful. If it passes easily, symphysiotomy isn’t called for. If it passes with difficulty, symphysiotomy may be appropriate. Procedure Position the patient in lithotomy position. Her legs must be secured in such a way that they will not further abduct when the symphysis is cut. This would result in painful injury to the sacroiliac joints. Place a stiff catheter in her urethra, which will be used to displace the urethra out of the path of your incision. Cleanse and prepare the skin over the symphysis in the usual fashion. Infiltrate with 1% lidocaine plus epinephrine (15-20 cc, maximum 7 mg/kg body weight). With your nondominant hand, reach into the vagina and displace the urethra and catheter. While holding the urethra out of harm’s way, locate the joint, and cut down to its full length. Maintain hemostasis and avoid the bladder. Next, divide the
Basic Obstetrics and Obstetric Surgery in a Mission Setting 135 joint using a scalpel to incise carefully and gradually until the joint opens. Do not allow more than 3 cm of separation. Assistants to support the patient’s legs at this point are essential. In conjunction with an episiotomy, this procedure should allow immediate delivery of the baby. You may require vacuum-assist, but DO NOT use forceps. Strain on the sacro-iliacs must now be diligently avoided. Repair the symphysiotomy with subcutaneous and subcuticular sutures. Repair your episiotomy in the usual fashion. Leave a Foley in place. The patient should not attempt to walk for 48 hours so DVT prophylaxis will be appropriate. She should be fully ambulatory by days 7-10. The symphysis should heal well, leaving an expanded pelvis that should facilitate future labors. Cesarean Section In the developed nations, the Cesarean is the most common major surgery, constituting 20% of births in United States and even higher elsewhere (e.g., Taiwan). Cesarean is also the most common emergency surgery in the mission setting. Practical knowledge of this procedure will therefore be of very high yield. There are two key decisions to be made en route to performing a Cesarean section. (1) When is a Cesarean indicated? (2) What type of Cesarean is indicated (low transverse, classic vertical, or more rarely, extraperitoneal Cesarean or Cesarean-hysterectomy). The risks and benefits of these related procedures are distinct, should be understood and when appropriate should be explained to the patient and her family. Indications for Cesarean are described in C1 and C2 below. Cesarean is indicated in cases of footling breech, breech with unfavorable pelvimetry, transverse or brow presentation. Cesarean is the only option for placenta previa and abruption. Contraindications to Cesarean include a head that is deeply engaged in the pelvis (either push it back up Zavinelli-like or consider a symphysiotomy), and fetal demise (in which case a destructive operation is far safer for the bereaved mother). Low Transverse Cesarean Section (LTCS - or Lapara-Trachelotomy) Indications A common indication for LTCS is dysfunctional labor (dystocia). Dysfunctional labor patterns include (1) primary dysfunction (failure to achieve a normal rate of dilatation in the first stage) and (2) secondary arrest of dilatation (arrest or failure to maintain a normal rate of dilatation in the first stage), both of which patterns must be recognized by use of a labor curve or “partograph”. Dysfunctional labor also includes secondary arrest of descent, e.g., the patient achieves full dilatation but is unable to bring the baby’s head (in vertex presentations) down to the ischial spines after two hours of pushing. In the latter case, LTCS should be considered if progress is not made after the following interventions. a. Empty the bladder by use of a straight catheter. b. If the patient is tired and pushing efforts inadequate, provide moderate fundal pressure with contractions and see if descent is gained. If the presenting part remains 3/5 or more above the pelvic brim, outlet forceps or vacuum extraction are inappropriate, and symphysiotomy would be problematic. Section is indicated. 15
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Basic Obstetrics <strong>and</strong> Obstetric <strong>Surgery</strong> <strong>in</strong> a Mission Sett<strong>in</strong>g<br />
135<br />
jo<strong>in</strong>t us<strong>in</strong>g a scalpel to <strong>in</strong>cise carefully <strong>and</strong> gradually until <strong>the</strong> jo<strong>in</strong>t opens. Do not<br />
allow more than 3 cm of separation. Assistants to support <strong>the</strong> patient’s legs at this<br />
po<strong>in</strong>t are essential.<br />
In conjunction with an episiotomy, this procedure should allow immediate delivery<br />
of <strong>the</strong> baby. You may require vacuum-assist, but DO NOT use forceps. Stra<strong>in</strong><br />
on <strong>the</strong> sacro-iliacs must now be diligently avoided.<br />
Repair <strong>the</strong> symphysiotomy with subcutaneous <strong>and</strong> subcuticular sutures. Repair<br />
your episiotomy <strong>in</strong> <strong>the</strong> usual fashion. Leave a Foley <strong>in</strong> place. The patient should not<br />
attempt to walk for 48 hours so DVT prophylaxis will be appropriate. She should be<br />
fully ambulatory by days 7-10. The symphysis should heal well, leav<strong>in</strong>g an exp<strong>and</strong>ed<br />
pelvis that should facilitate future labors.<br />
Cesarean Section<br />
In <strong>the</strong> developed nations, <strong>the</strong> Cesarean is <strong>the</strong> most common major surgery, constitut<strong>in</strong>g<br />
20% of births <strong>in</strong> United States <strong>and</strong> even higher elsewhere (e.g., Taiwan).<br />
Cesarean is also <strong>the</strong> most common emergency surgery <strong>in</strong> <strong>the</strong> mission sett<strong>in</strong>g. Practical<br />
knowledge of this procedure will <strong>the</strong>refore be of very high yield.<br />
There are two key decisions to be made en route to perform<strong>in</strong>g a Cesarean section.<br />
(1) When is a Cesarean <strong>in</strong>dicated? (2) What type of Cesarean is <strong>in</strong>dicated (low<br />
transverse, classic vertical, or more rarely, extraperitoneal Cesarean or<br />
Cesarean-hysterectomy). The risks <strong>and</strong> benefits of <strong>the</strong>se related procedures are dist<strong>in</strong>ct,<br />
should be understood <strong>and</strong> when appropriate should be expla<strong>in</strong>ed to <strong>the</strong> patient<br />
<strong>and</strong> her family.<br />
Indications for Cesarean are described <strong>in</strong> C1 <strong>and</strong> C2 below. Cesarean is <strong>in</strong>dicated<br />
<strong>in</strong> cases of footl<strong>in</strong>g breech, breech with unfavorable pelvimetry, transverse or<br />
brow presentation. Cesarean is <strong>the</strong> only option for placenta previa <strong>and</strong> abruption.<br />
Contra<strong>in</strong>dications to Cesarean <strong>in</strong>clude a head that is deeply engaged <strong>in</strong> <strong>the</strong> pelvis<br />
(ei<strong>the</strong>r push it back up Zav<strong>in</strong>elli-like or consider a symphysiotomy), <strong>and</strong> fetal demise<br />
(<strong>in</strong> which case a destructive operation is far safer for <strong>the</strong> bereaved mo<strong>the</strong>r).<br />
Low Transverse Cesarean Section (LTCS - or Lapara-Trachelotomy)<br />
Indications<br />
A common <strong>in</strong>dication for LTCS is dysfunctional labor (dystocia). Dysfunctional<br />
labor patterns <strong>in</strong>clude (1) primary dysfunction (failure to achieve a normal rate of<br />
dilatation <strong>in</strong> <strong>the</strong> first stage) <strong>and</strong> (2) secondary arrest of dilatation (arrest or failure to<br />
ma<strong>in</strong>ta<strong>in</strong> a normal rate of dilatation <strong>in</strong> <strong>the</strong> first stage), both of which patterns must<br />
be recognized by use of a labor curve or “partograph”. Dysfunctional labor also<br />
<strong>in</strong>cludes secondary arrest of descent, e.g., <strong>the</strong> patient achieves full dilatation but is<br />
unable to br<strong>in</strong>g <strong>the</strong> baby’s head (<strong>in</strong> vertex presentations) down to <strong>the</strong> ischial sp<strong>in</strong>es<br />
after two hours of push<strong>in</strong>g. In <strong>the</strong> latter case, LTCS should be considered if progress<br />
is not made after <strong>the</strong> follow<strong>in</strong>g <strong>in</strong>terventions.<br />
a. Empty <strong>the</strong> bladder by use of a straight ca<strong>the</strong>ter.<br />
b. If <strong>the</strong> patient is tired <strong>and</strong> push<strong>in</strong>g efforts <strong>in</strong>adequate, provide moderate<br />
fundal pressure with contractions <strong>and</strong> see if descent is ga<strong>in</strong>ed.<br />
If <strong>the</strong> present<strong>in</strong>g part rema<strong>in</strong>s 3/5 or more above <strong>the</strong> pelvic brim, outlet forceps<br />
or vacuum extraction are <strong>in</strong>appropriate, <strong>and</strong> symphysiotomy would be problematic.<br />
Section is <strong>in</strong>dicated.<br />
15