Basic and patient-oriented researchPostoperative Nausea and Vomiting (PONV) After Orthognathic Surgery: A Retrospective Study and Literature Review
Section snippets
Pathophysiology of Emesis
The physiology of the vomiting reflex is well understood; however, the pathways involved in the control of nausea and vomiting are not well-known. The act of vomiting, or the vomiting reflex, is coordinated by the vomiting center. This center is located in the lateral reticular formation of the medulla oblongata of the mid-brainstem, close to the fourth cerebral ventricle, to the nucleus of the solitary tract and to the area postrema at the level of the dorsal motor nucleus of the vagus nerve.
Patients and Methods
This study was designed as a retrospective cross-sectional analytic survey to assess the prevalence and possible risk factors for PONV in patients who underwent orthognathic surgery at the Division of Maxillofacial Surgery at Kaiser Permanente Oakland Medical Center (Oakland, CA) between January 2003 and March 2004. After obtaining approval from the Kaiser Permanente Institutional Review Board, a retrospective analysis of the medical records of all patients over 14 years of age who underwent
Preoperative factors and PONV
A total of 553 charts were analyzed in this survey; however, 39 medical records were incomplete and therefore excluded; 514 patients met the inclusion criteria. Of the 514 patients enrolled in this study, an overall prevalence of PONV of 40.08% (206/514) was found. Among the patients who experienced PONV, 63.11% (130/206) occurred only in PACU, 23.79% (49/206) occurred only in the SSU, and 13.11% (27/206) experienced PONV in both (PACU and SSU).
Discussion
The results of this study showed a high prevalence (40.08%) of PONV among orthognathic surgery patients during their hospital stay. This number likely underestimated the actual prevalence of PONV in our patient population as we did not evaluate PONV after our patients were discharged from the hospital. We verified Apfel’s7 4-factor risk score in our patient population and found that multimodal prophylaxis for PONV was not particularly effective in high-risk patients (Fig 3). We found that the
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