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Journal of the Korean Association of Oral and Maxillofacial Surgeons logoLink to Journal of the Korean Association of Oral and Maxillofacial Surgeons
. 2020 Apr 30;46(2):116–124. doi: 10.5125/jkaoms.2020.46.2.116

Incidence and risk factors for postoperative nausea and vomiting in orthognathic surgery: a 10-year retrospective study

Subhabrata Ghosh 1,✉, Kirthi Kumar Rai 1, Hosadurga Rudraswamy Shivakumar 1, Amarnath P Upasi 1, Vinayak Gourish Naik 1, Avijit Bharat 1
PMCID: PMC7222617  PMID: 32364351

Abstract

Objectives

Postoperative nausea and vomiting (PONV) is considered as one of the most incessant and anguishing factors for patients who have surgery under general anesthesia. The occurrence of PONV after orthognathic surgery can lead to dehydration, infection, bleeding at the surgical site, and patient discomfort, all of which leave a patient with a negative impression of anesthesia and surgery. The purpose of this study is to assess the incidence of PONV after orthognathic surgery and to correlate it with factors related to patient, anesthesia, and surgery.

Materials and Methods

A 10-year retrospective survey was done for patients who underwent orthognathic surgery between January 2008 and March 2018. The incidence of PONV was evaluated, correlations with factors related to patient, anesthesia, and surgery were studied, and the duration between the end of surgery and the occurrence of the first episode of PONV was tabulated.

Results

The medical records of 109 patients were screened, out of which 101 satisfied the inclusion criteria. Amongst these patients, 60 patients (59.4%) suffered from PONV. Patient’s sex, induction agent used, intravenous fluids administered intraoperatively, duration and type of surgery, and the presence of a nasogastric tube were seen to have a significant influence on precipitating PONV. It was noted that among the patients who suffered from PONV, 61.7% of them experienced it 48-96 hours after the end of surgery.

Conclusion

Despite the improved anesthetic equipments, drugs, and surgical techniques currently used, the incidence of PONV was high in our study. Certain factors that were seen to influence PONV in this study need to be considered in order to develop an efficacious protocol to reduce PONV in orthognathic surgeries.

Keywords: Postoperative nausea and vomiting, Orthognathic surgery, General anesthesia

I. Introduction

It has been more than a century since Flagg highlighted three main factors for postoperative nausea and vomiting (PONV): anesthetic drugs, reflex responses, and use of opioids. Subsequent studies have revealed a plethora of other factors precipitating PONV that include age, sex, motion sickness, body habitus, surgical site, and postoperative feeding procedures1. In the present world we have witnessed phenomenal improvement in the field of anesthetic equipment, drugs, and surgical techniques, but PONV still remains one of the most common problems for both the patient and the surgeon. It has been reported that 36% of all surgery patients experience PONV, and the percentage increases to 40% in the case of orthognathic surgeries2-4. PONV causes discomfort and stress in the patient and may also result in dehydration, electrolyte imbalance, esophageal rupture, wound dehiscence, aspiration of gastric contents, and possibly death5-7. The significance of PONV and its management is amplified for orthognathic surgeries for the very reason that the vomitus can affect the healing of intraoral surgical wounds and may also lead to intraoral bleeding, which may further trigger nausea and vomiting due to the swallowing of blood3,8. These events can prolong the patient’s stay in the hospital, thus increasing medical costs, and may leave a negative impression with the patient regarding the surgery5. Although reports in the literature suggest that the occurrence of PONV is highest amongst ophthalmologic, ear, intra-abdominal, and laparoscopic surgeries5,9,10, very few studies have documented the incidence of PONV following orthognathic surgeries over a considerable postoperative period or have analyzed its risk factors. The purpose of this retrospective study was to determine the prevalence of PONV in patients undergoing orthognathic surgeries and correlate it with key factors related to the patient, anesthesia, and surgery.

II. Materials and Methods

This study was designed as a retrospective cross-sectional study to evaluate the prevalence of PONV in patients who underwent orthognathic surgery in the Department of Oral and Maxillofacial Surgery at Bapuji Dental College and Hospital, Davangere, India, between January 2008 and March 2018. The collected data was correlated with certain potential risk factors. The study was given ethical approval by the Institutional Review Board of Bapuji Dental College and Hospital (No. BDC/Exam/393/2017-18). All patients above the age of 14 years who underwent orthognathic surgery in maxilla, mandible, or both simultaneously were included in the study. Patients with any history of PONV, vertigo, migraine headaches, and neurological or gastrointestinal problems were excluded from the study. Patients with incomplete or illegible medical records were also excluded. Medical charts were screened by one researcher. The nursing notes indicating the incidence of PONV and the need to administer antiemetic drugs in the post anesthetic care unit (PACU) and short stay unit (SSU) were noted. Nausea, vomiting, or retching were all classified as PONV.

All postoperative patients were kept under observation in the PACU or recovery room for 1 to 2 hours and were shifted to the SSU or wards when they had adequately controlled pain, had an adequate level of consciousness, and their vital parameters were stable.

In the SSU or wards the patients were administered parenteral antibiotics as per their requirements and were given analgesics to control pain. Regular intraoral irrigation and dressing of the surgical site was done and it was ensured that postoperative oral hygiene was maintained.

The data collected from the charts were divided into three sections: 1) patient-related factors, 2) general anesthesia-related factors, and 3) surgery-related factors.

In patient-related factors, the patient’s age, sex, and body mass index (BMI) were recorded. The BMI was calculated with the formula BMI=(body weight in kg)/(height in meter)2. All of these data were taken from the patient’s medical record. BMI was divided into four categories: underweight (BMI <18.5 kg/m2), normal weight (BMI 18.5-24.9 kg/m2), overweight (BMI 25-29.9 kg/m2), and obese (BMI 30 kg/m2 or greater).

The anesthesia records were extracted from the anesthetist’s chart. The induction agent used, the intraoperative intravenous (IV) fluids given per kg of body weight, and the administration of opioids were recorded. Over the 10-year period included in the study, all patients were anesthetized by the same anesthesiologist. All patients received a standard pre-anesthetic medication and, in all cases, general anesthesia was maintained with a mixture of nitrous oxide, oxygen, and isoflurane. The total fluid that was given intraoperatively was calculated in milliliters and was divided by the patient’s body weight to obtain the IV fluids given/kg body weight. Any opioids given at the end of the surgical procedure were also noted.

In the surgery-related factors, the duration of surgery, site of surgery, and presence of nasogastric feeding tube were noted. The duration and the site of surgery was recorded from the operation theatre notes. The surgical site was divided into three categories: 1) maxillary procedures (maxillary osteotomies, palatal expansions); 2) mandibular procedures (mandibular sagittal osteotomies, distraction osteogenesis, genioplasty); and 3) bi-jaw procedures (maxillary and mandibular osteotomies). The decision for the requirement of the nasogastric tube was taken by the operating surgeon prior to the surgery. In patients where a nasogastric tube was present, gastric lavage was done postoperatively and this tube was used for feeding purpose also. The nasogastric tube was removed once the healing of the surgical wounds were adjudged to be satisfactory by the operating surgeon.

Nursing notes made in the PACU and SSUs, as well as administration of postoperative antiemetic drugs, were evaluated to determine the prevalence of PONV. The time elapsed between the end of surgery and the occurrence of first episode of PONV was also documented.

A compilation of data and percentage analysis was performed. The results were analyzed statistically using Pearson’s correlation test for parametric variables and a chi-square test for non-parametric variables. Results were considered to be significant at a 5% critical level (P<0.05). Statistical analysis was performed using IBM SPSS Statistics (ver. 22.0; IBM, Armonk, NY, USA).

III. Results

A total of 109 medical records were analyzed in this study, out of which 101 met the inclusion criteria. Of the 101 patients, the prevalence of PONV was found to be 59.4% (60/101).

1. Patient-related factors

In this study, 78.2% patients were female (79/101), out of which 69.6% (55/79) experienced PONV when compared to 22.7% (5/22) of the males (Fig. 1), and this was statistically significant.(Table 1) Our sample group consisted of patients in the age range of 14-28 years. It the highest prevalence of PONV was seen in the age group 19-23 years (64.3%), but there was no statistical correlation found between age and PONV. The incidence of PONV was found to be directly proportional to BMI (underweight, 50%; normal, 53.1%; obese, 72%; and overweight, 77.8%) but this was not statistically significant.

Fig. 1. Incidence (%) of postoperative nausea and vomiting (PONV) with sex.

Fig. 1

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Table 1.

Descriptive statistics of correlation between PONV and potential risk factors

Potential risk factor Sub group No. of patients PONV present PONV absent P-value
Age (yr) 14-18 26 14 (53.8) 12 (46.2) 0.974
19-23 56 36 (64.3) 20 (35.7)
24-28 19 10 (52.6) 9 (47.4)
Sex Male 22 5 (22.7) 17 (77.3) 0.000*
Female 79 55 (69.6) 24 (30.4)
Body mass index (kg/m2) Underweight 18 9 (50.0) 9 (50.0) 0.178
Normal 49 26 (53.1) 23 (46.9)
Obese 25 18 (72.0) 7 (28.0)
Overweight 9 7 (77.8) 2 (22.2)
Induction agent Thiopentone 71 53 (74.6) 18 (25.4) 0.000*
Propofol 30 7 (23.3) 23 (76.7)
Intraoperative IV fluids given per kg body weight <25 mL/kg body weight 39 16 (41.0) 23 (59.0) –0.386*,1
≥25 mL/kg body weight 62 44 (71.0) 18 (29.0)
Usage of opioids intraoperatively Butrephenol only 38 19 (50.0) 19 (50.0) 0.004*
Pentazocine only 22 9 (40.9) 13 (59.1)
Butrephenol/pentazocine and tramadol at the end of the procedure 41 32 (78.0) 9 (22.0)
Duration of surgery (min) 0-180 36 8 (22.2) 28 (77.8) –0.468*,1
181-360 49 37 (75.5) 12 (24.5)
More than 360 16 15 (93.8) 1 (6.3)
Surgical procedures Mandibular procedures 37 17 (45.9) 20 (54.1) 0.021*
Maxillary procedures 37 22 (59.5) 15 (40.5)
Bi-jaw procedures 27 21 (77.8) 6 (22.2)
Nasogastric tube Present 73 54 (74.0) 19 (26.0) 0.000*
Absent 28 6 (21.4) 22 (78.6)
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(PONV: postoperative nausea and vomiting, IV: intravenous)

*

P<0.05 is statistically significant. 1Negative correlation which is statistically significant.

Values are presented as number only or number (%).

2. Anesthesia-related factors

Among the patients who were induced by thiopentone sodium, 74.6% (53/71) experienced PONV while only 23.3% (7/30) of the patients who were induced by propofol experienced PONV.(Fig. 2) This effect of propofol on PONV was found to be statistically significant.(Table 1) It was noted that when less than 25 mL/kg bodyweight of IV fluid was given intraoperatively, 41.0% (16/39) of the patients experienced PONV, which increased to 71.0% (44/62) when more than 25 mL/kg bodyweight of IV fluid was given intraoperatively.(Fig. 3) This relation between IV fluids/kg bodyweight was statistically significant.(Table 1) The incidence of PONV was seen to rise significantly (78.1%) when an opioid (injected tramadol) was given immediately after the surgery and was statistically significant.(Fig. 4, Table 1)

Fig. 2. Incidence (%) of postoperative nausea and vomiting (PONV) with the agent used for induction of general anesthesia.

Fig. 2

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Fig. 3. Incidence (%) of postoperative nausea and vomiting (PONV) with the intraoperative intravenous fluids given per kg body weight.

Fig. 3

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Fig. 4. Incidence (%) of postoperative nausea and vomiting (PONV) with usage of opioids.

Fig. 4

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3. Surgery-related factors

In our study group, the duration of surgery ranged from 1.5 to 9.5 hours, amongst which there was a significant increase in PONV if the surgeries lasted for more than 3 hours (1-3 hours, 22%; more than 3 hours, 81.3%).(Fig. 5, Table 1) Among the surgical procedures, bi-jaw surgery patients had the highest incidence of PONV (77.8%) followed by patients who underwent only maxillary surgeries (59.5%) and mandibular surgeries (46.0%).(Fig. 6, Table 1) The incidence of PONV was high (74.0%, 54/73) in patients who had a nasogastric tube present postoperatively when compared to patients without a nasogastric tube (21.4%, 6/28).(Fig. 7, Table 1)

Fig. 5. Incidence (%) of postoperative nausea and vomiting (PONV) with duration of surgery.

Fig. 5

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Fig. 6. Incidence (%) of postoperative nausea and vomiting (PONV) with the surgical procedure.

Fig. 6

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Fig. 7. Incidence (%) of postoperative nausea and vomiting (PONV) with the presence of nasogastric tube.

Fig. 7

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When the elapsed time between the first episode of PONV and the end of general anaesthesia was tabulated, it was seen that out of 60 patients who suffered from PONV, 37 (61.7%) of them experienced it 48-96 hours after the end of surgery.(Fig. 8)

Fig. 8. Time elapsed between end of general anesthesia and first episode of postoperative nausea and vomiting (PONV).

Fig. 8

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IV. Discussion

This study was designed to investigate the prevalence and risk factors for PONV in patients undergoing orthognathic surgery on an inpatient basis in our unit. It has already been shown in the studies by Apfel et al.3 and Silva et al.4 that patients with any past history of PONV, motion sickness, vertigo, or migraine headaches and smoking were predisposed to have a higher prevalence of PONV, thus we decided to exclude any such patients from our study group to remove these confounding factors3,6,8,9-12. In our study patients had to be at least 14 years old to be included because the incidence of PONV in children is twice as much as in adults due to an infrequent use of premedication and opioids in the pediatric cohort13-15. Though recent literature suggests that nausea and vomiting are two biologically different phenomenon, in this study we have considered them as one single event and have termed it as PONV. The results of this study showed a high prevalence of PONV (59.4%) amongst our study population, which is significantly more than what was observed by Silva et al.4 (40.1%) and several other studies conducted in this field (20%-30%)2,6,13,16,17, where the patients were observed for a short period of 2-3 days and thus episodes of PONV that occurred afterwards could not be tabulated. Hence, this may be the probable reason for the higher percentage of PONV in this study as it recorded all episodes of PONV during the 6 days after surgery. This observation agreed with that of Carroll et al.18, who reported that there was an over 30% prevalence for post-discharge nausea and vomiting up to 5 days after surgery. Moreover, orthognathic surgery patients have an altered diet after surgery, have associated lip numbness, orofacial swelling, and have episodes of swallowing of blood, all of which are common in the early postoperative period and thus may be associated with the higher prevalence of PONV4,8. There is a wide range of independent factors which have been associated with PONV, out of which we have studied a few in this survey and we have broadly divided them into three sections: 1) patient-related factors; 2) anesthesia-related factors; and 3) surgery-related factors.

1. Patient-related factors

In this study there was no statistical correlation seen between the patient’s age and the presence of PONV. According to Lerman13, the incidence of PONV was least in infants, increases in childhood, and remains constant or decreases slightly through adulthood (16-40 years)14,19-30. Our patient group was 14-28 years of age, which might be a possible reason for the non-significant statistical results for the PONV incidence in this age group. Also, the relationship between the incidence of PONV and age has been difficult to clarify, partly because of the confounding effects of uncontrolled variables such as sex, surgical case mix, anesthetic medications, and duration of surgery13.

Also, 79 out of 101 patients in our patient group were females and the results showed an approximate increase of 40% in the prevalence of PONV among females when compared with males (male, 22.7%; female, 69.6%). This result shows a significant influence of sex on the prevalence of PONV. This may be because of the intense fluctuations in the female sex hormone concentrations during the menstrual cycle, with the greatest incidence of PONV in adult females occurring during the third and fourth week of the menstrual cycle31,32.

The relation between BMI and PONV is controversial. While some studies have found an increase in the prevalence of PONV with an increase in BMI8, others have failed to find any significant relationship between the two4. Our study did not find any statistical significance between BMI and PONV, but it was observed that with an increase in BMI, the incidence of PONV increased. This may be attributed to the fact that the generous fatty tissue in obese patients could act as a long-term storage area, thus prolonging the adverse effects of some lipid soluble emetogenic drugs, especially in surgeries that go for more than 3 hours2,8.

2. Anesthesia-related factors

Several studies conducted in the past on the effect of general anesthesia on PONV have highlighted several independent factors affecting its incidence. In our study group, all of the cases were operated under the vigilance of a single anesthetist and in all cases patient endotracheal intubation was done and nitrous oxide was used along with isoflurane to maintain the anaesthesia. This might be another reason for the higher prevalence of PONV noted amongst our patients because it has been substantiated in previous studies that both endotracheal intubation and nitrous oxide an associated with an increased incidence of PONV6,7,12,33-35. Moreover comparative studies have shown a much lower incidence of PONV with the usage of isoflurane (4%) when compared to desflurane (67%) and sevofluorane (36%), which may be because of the higher solubility of isoflurane compared to desfluorane and sevofluorane36.

Of all patients, 70.5% induced by thiopentone suffered from PONV while only 25.9% induced by propofol suffered the same, suggesting a statistically significantly negative influence of propofol on the prevalence of PONV (P=–0.415, P<0.5). This result is in harmony with several other studies that substantiate that propofol, when used as an induction agent, possesses antiemetic properties and thus can be employed as a combination prophylaxis against PONV37-39.

In our study a statistically significant correlation was seen to exist between PONV and the intraoperative IV fluids given per kg of body weight. It was seen that the patients who received ≥25 mL/kg of IV fluids intraoperatively were more likely to experience PONV. Though pre-existing guidelines encourage hydration to minimize the risk of PONV11,33,40, this study reflected otherwise, which may be because of an increased duration of anesthesia and surgery, associated with an increase in IV fluid administration41.

In our hospital, an injection of an antiemetic prophylaxis (ondansetron 4 mg IV) was given to all adult patients along with the general anesthesia reversal agents. This may be one of the reasons for the low incidence of PONV in the first 24 hours after surgery. Though ondansetron is shown to have a good antiemetic effect without many side effects, drugs like granisetron have been seen to have better effects on reducing the incidence of PONV in the first 24 hours after surgery and may be a viable alternative42.

The incidence of PONV when evaluated against the administration of opioids was seen to be maximum (78.1%) when tramadol was given at the end of the procedure which was statistically significant. The etiology of PONV after opioid usage can be traced back to three mechanisms. First, the chemoreceptor trigger zone is stimulated by opioids, which releases dopamine and serotonin, thus activating the emetic center of the brain. Second, opioids result in a reduction of gastric motility, further leading to dopamine and serotonin release from afferent visceral fibers and thus activating the medullary vomiting center. Lastly, opioids sensitize the middle ear to movement, thus resulting histamine and acetylcholine release, which activates the medullary vomiting center43-46.

3. Surgery-related factors

The impact of orthognathic surgery on PONV has been controversial. In 2007, the Society for Ambulatory Anesthesia (SAMBA) consensus guidelines mentioned orthognathic surgery as a high-risk factor for PONV, though it was removed later in 201411,33,40. However, the high prevalence of PONV seen in this study and in subsequent studies4,41 advocates for more importance to be given to this genre of surgeries with respect to PONV. Amongst the various surgical factors, we evaluated the correlation between PONV and surgery duration, the surgical site, and the use of a nasogastric tube.

Duration of surgery has been seen to affect the incidence of PONV in various studies in the past9,11,33,47 and it was no different in this study. When the surgery lasted less than 3 hours the prevalence of PONV was only 22.2% (8/36), which increased significantly after prolonged procedures (3-6 hours, 75.5%; more than 6 hours, 93.8%). The probable reasons for the effect of surgery duration on the incidence of PONV may be the increased effects of premedication, the accumulation of emetogenic anesthetic drugs, including nitrous oxide, prolonged fasting, and increased pain in surgeries of longer duration2,47. It is believed that when a surgery lasts for more than 3 hours, the effect of BMI on PONV also comes into play, as the lipids in the body serve as a reservoir for emetogenic drugs2,8.

It was also noted that a higher number of episodes of PONV were seen in patients undergoing maxillary and bi-jaw surgeries. Maxillary procedures usually result in greater postoperative bleeding, swallowing of blood, and are associated with the use of hypotensive anesthesia, all of which result in a higher incidence of PONV. However, a higher incidence of PONV with bi-jaw surgeries may be due to the greater average length of the surgical procedures and the involvement of the maxilla, both of which may predispose the patient to PONV2,4,41.

The role of a nasogastric tube on PONV has been controversial. One school of thought reasons it has a beneficial role in that it aids expelling old blood from the stomach. Another group believes an indwelling tube acts as a chronic irritant to the throat and stomach and precipitates PONV by stimulation of the glossopharyngeal nerve33,41,48-50. In our study it was seen that 74.0% of the patients who had a nasogastric tube suffered from PONV while the percentage reduced to 21.4% when there was none.

One of the unique features of this study was the prolonged monitoring of PONV in the patients. The data suggests an unusual spike in the prevalence of PONV between 48-96 hours after surgery, and advocates for further research in this field to find the possible reason.

V. Conclusion

It was seen that there was a high prevalence of PONV amongst orthognathic surgery patients and there were significant correlations between PONV and certain patient-, anaesthesia-, and surgery-related factors. Thus, in order to improve the perioperative management of PONV, an extensive understanding of its causes and risk factors is essential. Preoperative assessment should have a detailed protocol that includes a tool for risk assessment and to label high risk patients for PONV so that prophylactic steps can be taken to reduce its occurrence.

Footnotes

Authors’ Contributions

S.G. took part in conceptualising, study design collecting of data and writing of manuscript. K.K.R. took part in conceptualising and writing of manuscript. H.R.S., A.P.U., and V.G.N. did revision and correction of manuscript. A.B. did data collection and statistical analysis along with S.G.

Ethics Approval and Consent to Participate

The study was given ethical approval by the Institutional Review Board of Bapuji Dental College and Hospital (No. BDC/Exam/393/2017-18), and the informed consent was waived.

Conflict of Interest

No potential conflict of interest relevant to this article was reported.

How to cite this article: Ghosh S, Rai KK, Shivakumar HR, Upasi AP, Naik VG, Bharat A. Incidence and risk factors for postoperative nausea and vomiting in orthognathic surgery: a 10-year retrospective study. J Korean Assoc Oral Maxillofac Surg 2020;46:116-124. https://doi.org/10.5125/jkaoms.2020.46.2.116

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