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Table of Contents
REVIEW ARTICLE
Year : 2022  |  Volume : 13  |  Issue : 2  |  Page : 190-194  

Role of general anesthetic agents in postoperative nausea and vomiting: A review of literature


1 Department of Oral and Maxillofacial Surgery, Sri Ramakrishna Dental College and Hospital, Coimbatore, Tamil Nadu, India
2 Department of Paediatric Dentistry, Ministry of Health, King Khaled Hospital, Riyadh, Saudi Arabia
3 Skin and Laser Care Centre, Dr. Sulaiman Al Habib Hospital, Riyadh, Saudi Arabia
4 General Dentist, Narayana Dental College and Hospital, Nellore, Andhra Pradesh, India
5 General Dentist, Pro Dent Advanced Dental Care, Hyderabad, Telangana, India
6 Department of Oral and Maxillofacial Surgery, SGT University, Jhajjar, Haryana, India

Date of Submission15-Jul-2020
Date of Acceptance13-Jul-2021
Date of Web Publication15-Jun-2022

Correspondence Address:
Dr. Shilpa Sunil Khanna
Department of Oral and Maxillofacial Surgery, Sri Ramakrishna Dental College and Hospital, Coimbatore, Tamil Nadu
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/njms.NJMS_146_20

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   Abstract 


Postoperative nausea and vomiting (PONV) is considered to be the most unpleasant experience associated with surgery and is believed to be one of the most common reasons for poor patient satisfaction in the postoperative period. It also results in prolonged hospitalization and increased use of resources such as intravenous fluids and drug supplements along with prolonged medical attention, all of which have psychological and financial implications. In addition to this, PONV can result in aspiration, laryngospasm, dehydration, electrolyte disturbances, gastric bleeding, increased intracranial pressure, increased intraocular pressure, and wound dehiscence particularly when the surgical intervention is performed through an intraoral approach. It is a well-known fact that there are many etiological factors as well as predisposing factors for PONV. Hence, this review is intended to evaluate as an individual factor what the role was played by the anesthetic agents used for GA in the incidence of PONV.

Keywords: General anesthesia, postoperative nausea and vomiting, surgery


How to cite this article:
Khanna SS, Abdul MS, Fatima U, Garlapati H, Qayyum MA, Gulia SK. Role of general anesthetic agents in postoperative nausea and vomiting: A review of literature. Natl J Maxillofac Surg 2022;13:190-4

How to cite this URL:
Khanna SS, Abdul MS, Fatima U, Garlapati H, Qayyum MA, Gulia SK. Role of general anesthetic agents in postoperative nausea and vomiting: A review of literature. Natl J Maxillofac Surg [serial online] 2022 [cited 2022 Aug 9];13:190-4. Available from: https://www.njms.in/text.asp?2022/13/2/190/347380




   Introduction Top


It is a well-known fact that postoperative nausea and vomiting (PONV) is a common sequela following surgical intervention performed in the oral and maxillofacial region, particularly via intraoral approach under general anesthesia. It is considered to be an unpleasant experience associated with surgery and is believed to be the most common reason for poor patient satisfaction in the postoperative period.[1] Clinically, patients would appear pale and diaphoretic in response due to the sensation of nausea. As a result of anxiety, there would be tachycardia and tachypnea. Active vomiting can stimulate a sympathetic response leading to hypertension and tachycardia. The Valsalva associated with active vomiting can lead to bradycardia and leads to increased intrathoracic pressure and intracranial pressure which can be detrimental to patients in the postoperative period. PONV can result in aspiration, laryngospasm, dehydration, electrolyte disturbances, gastric bleeding, increased intracranial pressure, increased intraocular pressure, and wound dehiscence.[1]

Few predisposing factors are put forth to be associated with PONV. These include previous history of nausea and vomiting, gastrointestinal tract disorders, the duration and type of anesthetic used, and the type of surgical access adopted.[2] PONV is influenced by multiple factors which are related to the patient, surgery, and pre-, intra-, and postoperative anesthesia factors.[3] The reason for PONV is multifactorial. It is assumed to be arising from the chemoreceptor trigger zone (CTZ) in the brainstem, from opiate-induced, direct effects on the gastrointestinal (GI) tract and other anesthetics as well as in the vestibular system through movement and from the sensitization of this system by agents commonly used in anesthesiology. Type and location of surgery play a role as well, and ocular and tympanic surgery and intracranial, abdominal, and gynecological surgeries pose an increased risk for PONV.[4],[5]

Previous studies have shown that pediatric patients exhibit only vomiting due to difficulties in eliciting nausea at a young age. PONV is noticed in 13%–42% of all pediatric patients undergoing surgical interventions under GA. A peak incidence of 34%–51% is noticed in the 6–16 year age group. Prior to puberty, gender differences for postoperative vomiting have not been identified.[6] Literature shows that general anesthesia is associated with an 11-fold increased risk of PONV, which is frequently caused by the emetic properties of volatile anesthetics and the opioids administered.[7] In addition to this, literature shows that the type of surgery is an independent risk factor for PONV.[4] Surgical interventions involving the maxillofacial region, eyes, oropharynx, and auditory system have been shown to have a higher prevalence of PONV.[2]

A literature search was done on Medline and relevant articles were chosen. In this article, we present evidence regarding the risk factors, prophylaxis, and treatment of PONV based on the existing literature using data from randomized controlled trials, systematic reviews, logistic regression analyses, and expert opinion.

Anesthetic factors

Since the anesthesiologist employs more than one drug during an anesthetic procedure, it is difficult to sort out the effects of an individual drug on the incidence of PONV. The incidence of PONV is reported to occur around 8% to 92% and varies according to type and duration of the surgical procedure, age, gender and smoking status of the patient, use of opioids, and anesthetic technique.[8] The pathophysiology of PONV is complex as it involves various pathways and receptors. There are five primary afferent pathways involved in stimulating vomiting which include the CTZ, the vagal mucosal pathway in the GI system, neuronal pathways from the vestibular system, reflex afferent pathways from the cerebral cortex, and the midbrain afferents.[9] Stimulation of one of these afferent pathways can activate the sensation of vomiting via cholinergic, dopaminergic, histaminergic, or serotonergic receptors.[1],[9] The multifactorial etiology of PONV necessitates the need to investigate whether the anesthetic agents used in general anesthesia play a role in PONV.

Nitrous oxide

Studies have shown that there was a significant decrease in postoperative emesis in clinical scenarios where nitrous oxide was avoided in patients undergoing laparoscopic procedures. Two meta-analyses have demonstrated that avoiding nitrous oxide can reduce PONV risk.[10],[11] Three mechanisms have been put forth as contributing factors to the increased incidence of postoperative emesis associated with nitrous oxide.[12] Due to stimulation of sympathetic nervous system with catecholamine release, middle ear pressure changes result in traction of the membrane of round window and consequent stimulation of the vestibular system and Increased abdominal distension as a result of exchange of nitrous oxide and nitrogen in gas introduced into GI tract during mask ventilation.[13],[14],[15] Previous studies show that nitrous oxide does not play a role in the incidence of PONV particularly in adults when halogenated inhalation agents are used.[12] However, nitrous oxide can increase the incidence of PONV in children when used with propofol.[16]

A recent study evaluated the inclusion of nitrous oxide in the gas mixture and it is implicated in PONV taking duration of exposure as a criterion. They concluded that there exists a relation between the duration of exposure to nitrous oxide and the incidence of PONV. This duration-related effect may be via disturbance of methionine and folate metabolism. There was no existing clinically significant effect of nitrous oxide on the risk of PONV for less than an hour of exposure. Hence, nitrous oxide-related PONV should not be seen as an impediment to its use in minor or ambulatory surgery.[17] A recent study retrospectively reviewed the records of 372 patients who underwent surgical interventions in the oral and maxillofacial region to determine the incidence and ascertain the risk factors of PONV. They concluded that a longer duration of anesthesia was associated with an increased risk of PONV.[2],[9] Another study supported this concept and reported that a duration of surgery greater than 60 min increases a patient's risk of experiencing both PON and POV and that a 30-min increase in surgical time predicts a 60% increase in the risk of PONV.[18]

Inhalational agents

Previous studies show that ether and cyclopropane play a role in the higher incidence of PONV as a result of increase in endogenous catecholamines. Sevoflurane, enflurane, desflurane, and halothane are considered to be associated with a lesser degree of PONV.[19] Based on the available literature, it can be advocated that the effect of volatile anesthetics on PONV is dose dependent and is predominantly noticed in the first 2–6 h following surgery. Volatile anesthetics can be considered as the major cause of early PONV and they have minimal impact on delayed PONV.[20] A retrospective cross-sectional analytic survey revealed that a higher prevalence of PONV was noticed with the use of volatile general anesthetics.[21]

Propofol

Numerous studies have shown that propofol results in a lesser incidence of PONV when compared to other intravenous agents even in pediatric patients.[22] Even though some studies have speculated that propofol has a specific antiemetic effect, there is a lack of evidence pertaining to the effect of propofol on the emetic center or CTZ. Studies show that propofol when used alone as an intravenous agent is associated with a lesser incidence of PONV.[16] Ostman et al. advocated that the antiemetic effect of propofol may not be attributed to lipid emulsion used to solubilize the drug.[23] Borgeat et al. reported that propofol does not have vagolytic properties.[24] In a study by Hammas et al., propofol reduced the intensity of PONV after oral intake of ipecacuanha syrup, which releases 5-hydroxytryptamine. It is concluded that propofol may have a serotonin antagonistic effect.[25] Propofol decreased synaptic transmission in the olfactory cortex in an animal study, suggesting a decrease in the release of excitatory amino acids such as glutamate and aspartate, which may be related to its antiemetic activity.[26]

Ketamine

Previous studies have shown that ketamine used for induction resulted in a higher incidence of PONV compared to a patient receiving barbiturates with nitrous oxide. It is advocated that the emetic effect of ketamine is secondary to endogenous catecholamine release.[27] A recent study evaluated the effect of ketamine as an adjunct to a fentanyl-based IV patient-controlled analgesia (IV-PCA) on PONV. It concluded that ketamine did not reduce the incidence of PONV and exerted a negative influence on the severity of nausea. However, it was able to reduce postoperative fentanyl consumption in patients at high risk of PONV.[28] Another study demonstrated that a low-dose administration of ketamine during anesthesia induction improves the extubation time but has no effect on postoperative pain, nausea and vomiting, and perioperative additional analgesic requirements.[29]

Opioids

It is advocated that opioids cause PONV through stimulation of opioid receptors located in CTZ. However, the role of intraoperative opioids in the incidence of PONV is minimal.[3] A recent study evaluated the factors associated with postoperative nausea vomiting following oral and maxillofacial surgery during the first 24–48 h following the surgical intervention. They concluded that the occurrence of PONV after oral and maxillofacial surgery was found to be more strongly associated with patients who used opioids.[2] The prevalence of PONV in pstients who underwent maxillary and/or mandibular osteotomies reveals a higher prevalence of PONV as a result of the use of volatile general anesthetics and postoperative opioid analgesics.[23] In addition to this, studies have shown that there is no difference among different opioids in the incidence of PONV.[30] The incidence of analgesic-induced PONV is reduced with the development of potent NSAIDs. Intraoperative ketorolac has shown to be as effective as morphine and propofol in reducing postoperative pain as is associated with a lesser incidence of PONV.[31]

The drug used for the treatment of postoperative nausea and vomiting and its site of action and the review of previous studies are shown in [Table 1] and [Table 2] respectively.
Table 1: The drug used for the treatment of postoperative nausea and vomiting and its site of action

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Table 2: The review of previous studies

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   Management Top


Previously, a study evaluated the role of prophylactic antiemetic and its effects in the management of postoperative nausea and vomiting following maxillofacial surgery. It concluded that in moderate, high, and very high-risk patients, the benefits of prophylaxis for PONV outweigh the risks, side effects, and cost of antiemetic medications and are preferable to giving no prophylaxis.[32] Palonosetron is a newer antiemetic with a half-life of 40 h. Literature shows that it can be safely used in patients with cardiac impairment.[33] A meta-analysis revealed that palonosetron is safe and more effective than ondansetron or ramosetron in preventing early and late PONV.[34] Another recent study compared the efficacy of ondansetron and clonidine in the prevention of postoperative pain and nausea and vomiting after orthognathic surgeries and concluded that ondansetron with dexamethasone premedication was more effective in controlling PONV after orthognathic surgery compared to clonidine with dexamethasone group.[35] A combination of prophylactic antiemetic drugs with different mechanisms of action should be administered to patients with moderate to high risk of developing PONV. With the existing evidence in literature, clinicians should intervene in PONV as early as possible since it can be cost-effective to the patients and enhance their comfort levels in the postoperative phase.[36]


   Conclusion Top


Based on the existing literature, there are numerous factors associated with the risk of PONV in the form of age, gender, history of motion sickness or postoperative vomiting, and the type of surgical intervention. Based on this review of literature, it is understood that the anesthetic agents have a little or no effect on the incidence of PONV. However, the duration of surgery definitely plays a key role in the incidence of PONV. Potent nonopioid analgesics like ketorolac should be considered to control pain instead of opioid analgesics. Proper antiemetic therapy should be administered in the preoperative period to avoid deleterious effects of PONV in the postoperative period whenever required.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.



 
   References Top

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[PUBMED]  [Full text]  
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Watcha MF, White PF. Postoperative nausea and vomiting. Its etiology, treatment, and prevention. Anesthesiology 1992;77:162-84.  Back to cited text no. 12
    
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Perreault L, Normandin N, Plamondon L, Blain R, Rousseau P, Girard M, et al. Middle ear pressure variations during nitrous oxide and oxygen anaesthesia. Can Anaesth Soc J 1982;29:428-34.  Back to cited text no. 14
    
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Eger EI 2nd, Saidman LJ. Hazards of nitrous oxide anesthesia in bowel obstruction and pneumothorax. Anesthesiology 1965;26:61-6.  Back to cited text no. 15
    
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Watcha MF, Simeon RM, White PF, Stevens JL. Effect of propofol on the incidence of postoperative vomiting after strabismus surgery in pediatric outpatients. Anesthesiology 1991;75:204-9.  Back to cited text no. 16
    
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Peyton PJ, Wu CY. Nitrous oxide-related postoperative nausea and vomiting depends on duration of exposure. Anesthesiology 2014;120:1137-45.  Back to cited text no. 17
    
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Phillips C, Brookes CD, Rich J, Arbon J, Turvey TA. Post operative nausea and vomiting following orthognathic surgery. J Oral Maxillofac Surg 2015;44:745-51.  Back to cited text no. 18
    
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Ostman PL, Faure E, Glosten B, Kemen M, Robert MK, Bedwell S. Is the antiemetic effect of the emulsion formulation of propofol due to the lipid emulsion? Anesth Analg 1990;71:536-40.  Back to cited text no. 23
    
24.
Borgeat A, Wilder-Smith OH, Saiah M, Rifat K. Subhypnotic doses of propofol possess direct antiemetic properties. Anesth Analg 1992;74:539-41.  Back to cited text no. 24
    
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Samieirad S, Sharifian-Attar A, Eshghpour M, Mianbandi V, Shadkam E, Hosseini-Abrishami M, et al. Comparison of Ondansetron versus Clonidine efficacy for prevention of postoperative pain, nausea and vomiting after orthognathic surgeries: A triple blind randomized controlled trial. Med Oral Patol Oral Cir Bucal 2018;23:e767-76.  Back to cited text no. 35
    
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Dewinter G, Staelens W, Veef E, Teunkens A, Van de Velde M, Rex S. Simplified algorithm for the prevention of postoperative nausea and vomiting: A before-and-after study. Br J Anaesth 2018;120:156-63.  Back to cited text no. 36
    



 
 
    Tables

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