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Complementary Alternative Cardiovascular Medicine

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Chapter 15 / Aromatherapy and CVD 241<br />

Aromatherapy was not mentioned in Eisenberg’s 1993 landmark study<br />

(3). This study showed nonconventional medicine to be a serious consumer-led<br />

commodity, with one in three Americans using complementary<br />

therapies. However, 5 yr later in Eisenberg’s second study (4),<br />

aromatherapy was used by 5.6% of the adult patient population (n = 2055<br />

adults).<br />

DEFINITIONS<br />

Aromatherapy is the use of essential oils for therapeutic purposes that<br />

encompass mind, body, and spirit (5). The name aromatherapy leads<br />

people to believe that the therapy is purely about smelling scents, but this<br />

belief is incorrect (6). There are many different kinds of aromatherapy,<br />

ranging from a nice-smelling candle to the clinical application of essential<br />

oils for medicinal reasons (7). Only the role of clinical aromatherapy<br />

has a place in a cardiology text.<br />

The definition of essential oils is specific—they are “the steam distillates<br />

of aromatic plants” (8). Therefore, any extract not obtained by<br />

steam distillation is not an essential oil and is relevant for use in<br />

aromatherapy. Essential oils are found in the flowers, leaves, bark, wood,<br />

roots, seed, and peels of aromatic plants and are stored in microscopic<br />

cellular containers of the plant, i.e., cells, glands, ducts, and hairs. Essential<br />

oils are highly volatile, complex mixtures of chemical constituents<br />

divided into functional groups, such as ketones, alcohols, terpenes, and<br />

esters. The proportions of these individual constituents vary according<br />

to the species of plant, climate where grown, and distillation process<br />

used. It is the chemistry of an essential oil that determines its therapeutic<br />

properties.<br />

SCIENTIFIC BASIS<br />

The pharmacologically active components in essential oils work at<br />

psychological and physical levels. Aroma effects can be rapid, and,<br />

occasionally, just thinking about a smell can have a powerful effect. This<br />

effect can be relaxing or stimulating, depending on the individual’s<br />

experiences, as well as the chemistry of the essential oil used. Essential<br />

oils can be absorbed into and through the skin in minutes. They are<br />

lipophyllic (fat soluble) and nonpolar (do not mix with water) and are<br />

excreted through respiration, the kidneys, and insensate loss.<br />

Each essential oil is composed of between 1 and 300 different chemical<br />

components. These separate olfactory stimulants travel via the nose<br />

to the olfactory bulb. From there, nerve impulses continue to the limbic<br />

system of the brain, an inner complex ring of brain structures below the

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