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Postoperative Nausea

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Management of a Patient with Postoperative Nausea and Vomiting
Susanne Frycek
Advocate Lutheran General Hospital

Introduction Post-Operative Nausea and Vomiting (PONV) is defined as any nausea, retching or vomiting occurring during the first 24 hours after surgery (Oxford Journals). It is an uncomfortable and unpleasant experience for the patient and can adversely affect the post recovery outcome by causing dehydration, electrolyte imbalance, aspiration, wound dehiscence, increasing length of stay (LOS), unanticipated admission, and increased healthcare costs, not to mention a top concern and great dissatisfier for the patient (JPN, Hodgens). Since approximately 30% of all post-operative patients …show more content…

To acquire a baseline of the severity of the nausea, I asked her to quantify it using a verbal descriptor scale (0-10) to establish if it was mild, moderate or severe, which is a recommendation established by the American Society of PeriAnesthesiaNurses (ASPAN). This would allow me to evaluate my interventions to determine if they were effective. The patient stated that she was experiencing a nausea score of "7", which would be moderate to severe in ranking. I immediately assessed the patient, determining that vital signs were stable, no complaints of discomfort, hydration of Lactated Ringers 800 ml was administered, along with prophylactic anti-emetics, Dexamethasone 6mg and Zofran 4mg IVP during surgery. After reviewing the medications ordered for Phase 1 recovery, the only anti-emetic ordered by Anesthesia was a second dose of Zofran 4mg. Based on current literature, it has been determined that when prophylaxis with one has failed, a repeat dose of that drug should not be initiated as a rescue therapy; instead, a drug from a different class of anti-emetic drugs should be administered (SOGC clinical practice). The reason for not repeating the dose is …show more content…

It is a large patient dissatisfier with many of my patients telling me that they would rather experience post operative pain (which they expected) than nausea (which they did not expect). The pathophysiology of PONV is very complex, because it can be triggered by several perioperative stimuli; including opioids, volatile anaesthetics, anxiety, adverse drug reactions and motion( ). The complex set of activities that culminate in vomiting come from two anatomically unique and distinct units within the brain stem; the vomiting center and Chemoreceptor Trigger Zone (CTZ) (Smith-Collins, 2011, p.36). They receive information/signals from a number of outlying sources and their excitement triggers vomiting. The "vomiting center" receives afferent (nerve fibers carrying sensory information toward a location) signals from several major sources; Viseral afferents from the Gastrointestinal Tract (GI distention, irritation), Viseralafferents outside the GI tract (Bile ducts, heart, variety of other organs), afferents from outside the area of the vomiting center of the brain responsible for vestibular disturbances (motion), psychic stimuli (odors, fear) and trauma, along with the CTZ. Since the Chemoreceptor Trigger Zone (CRZ) is situated outside of the blood brain barrier its responsibility is to detect chemical abnormalities in the body, such as

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