Basic and patient-oriented research
Postoperative Nausea and Vomiting (PONV) After Orthognathic Surgery: A Retrospective Study and Literature Review

https://doi.org/10.1016/j.joms.2006.05.024Get rights and content

Purpose

Postoperative nausea and vomiting (PONV) is the most common postoperative complication after surgery and general anesthesia. PONV occurs primarily within the first 24 hours and can lead to significant morbidity, delayed hospital discharge, increased hospital costs and perhaps most importantly, poor patient satisfaction. We sought, in this study, to determine the prevalence of PONV and to identify risk factors in patients who underwent orthognathic surgery.

Patients and Methods

We conducted a retrospective cross-sectional analytic survey of 553 consecutive patients over 14 years of age, who underwent maxillary and/or mandibular osteotomies at Kaiser Permanente Hospital (Oakland, CA), between January 2003 and March 2004. Patient-, anesthesia- and surgery-related factors that were considered to have a possible effect on the prevalence of PONV events were evaluated.

Results

A total of 514 patients met the inclusion criteria. Among these patients, 40.08% experienced PONV during the first 24 hours after surgery. The most important predictive factors associated with an increased risk of PONV were female gender, young patients (15 to 25 years old), nonsmoking status, presence of predisposing factors (ie, prior history of motion sickness and/or PONV, vertigo or migraine headaches), use of volatile general anesthetics, maxillary surgery, postoperative pain level (PACU) and the use of postoperative analgesic opioid drugs. We found a directly proportional relationship between the number of risk factors and the prevalence of PONV.

Conclusion

We found PONV had a high prevalence among patients undergoing orthognathic surgery. Further studies are needed to develop effective protocols for preventing this common and unpleasant problem.

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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