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The goal of this superiority randomized controlled trial (RCT) is to learn if one dual-drug arm increases patient comfort (time to needing rescue medication for nausea/vomiting) more effectively than the other in adults with Moderate-to-High PONV risk (Apfel score 2-4) undergoing elective laparoscopic cholecystectomy (gallbladder surgery).
The main question this study aims to answer is:
• Does Ondansetron plus Metoclopramide prolong time to first rescue antiemetic more than Dexamethasone plus Metoclopramide?
Researchers will compare Group A (Ondansetron 4mg plus Metoclopramide 10mg IV) to Group B (Dexamethasone 8mg IV plus Metoclopramide 10mg IV) to see if Group A provides a longer time to first rescue medication.
Participants will:
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Group A (Ondansetron and Metoclopramide)- Separate syringes | Experimental | Participants receive
|
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| Group B (Dexamethasone and Metoclopramide)- Separate syringes | Active Comparator | Participants receive
|
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| ondansetron 4 mg | Drug | Ondansetron 4 mg IV administered as a single colorless syringe 5-10 minutes before induction of anesthesia for prevention of postoperative nausea and vomiting. |
| Measure | Description | Time Frame |
|---|---|---|
| Time to First Rescue Antiemetic (in minutes) | Time in minutes from patient arrival to Post-anaesthesia care unit, PACU (time zero) to administration of rescue metoclopramide 10 mg IV. Rescue is given if patient experiences any episode of vomiting/retching or reports a nausea Verbal Rating Scale (VRS) score >4. VRS scale is no nausea (0), mild (1-3), moderate (4-6), and severe (7-10). | First 24 hours after surgery (measured from the time of arrival to Post-anaesthesia care unit, PACU) |
| Measure | Description | Time Frame |
|---|---|---|
| Incidence of PONV | Proportion of patients experiencing any nausea (VRS >1) or any vomiting/retching episode within the first 24 hours post-surgery. Verbal Rating Scale (VRS) is a well established measurement scale with a total of 11 points where 0 = no nausea and 10 = worst possible nausea. | 24 hours post-surgery |
| Measure | Description | Time Frame |
|---|---|---|
| Adverse Events | Proportion of patients experiencing any adverse reaction including allergic reaction, headache, perineal burning, dystonia, or QT prolongation on post-operative ECG. | From drug administration up to 24 hours post-surgery |
Inclusion Criteria:
Exclusion Criteria:
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| Name | Role | Phone | Extension | |
|---|---|---|---|---|
| Asifa Saeed, MBBS; FCPS | Contact | +923006694460 | drasifasaeed@gmail.com | |
| Huda Ather, MBBS | Contact | +923047922909 | atherhudaather@gmail.com |
| Name | Affiliation | Role |
|---|---|---|
| Asifa Saeed, MBBS; FCPS | Faisalabad Medical University | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Faisalabad Medical University | Faisalābad | Punjab Province | 38000 | Pakistan |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| Background | Alam, M. S., et al. (2025). Haloperidol Versus Dexmedetomidine As An Adjuvant to Ondansetron in Postoperative Nausea and Vomiting in Laparoscopic Cholecystectomy. Egyptian Journal of Surgery, 44(2), 456-463 | ||
| 25629760 | Background | Abel UR, Jensen K, Karapanagiotou-Schenkel I, Kieser M. Some Issues of Sample Size Calculation for Time-to-Event Endpoints Using the Freedman and Schoenfeld Formulas. J Biopharm Stat. 2015;25(6):1285-311. doi: 10.1080/10543406.2014.1000546. Epub 2015 Jan 28. | |
| 8829860 |
| Label | URL |
|---|---|
| STROBE stands for an international, collaborative initiative of epidemiologists, methodologists, statisticians, researchers and journal editors involved in the conduct and dissemination of observational studies, with the common aim of STrengthening the R | View source |
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Individual participant data will not be shared because the study is single-centre, small and unfunded. Only aggregated, de-identified, summary data will besshared
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|
| Dexamethasone (intravenous) | Drug | Dexamethasone 8 mg IV administered as a single colorless syringe 5-10 minutes before induction of anesthesia for prevention of postoperative nausea and vomiting. |
|
|
| Metoclopramide 10mg | Drug | Metoclopramide 10 mg IV administered as a single colorless syringe 5-10 minutes before induction of anesthesia as part of dual-agent PONV prophylaxis. Also used as rescue antiemetic (10 mg IV) if patient has vomiting or VRS >4 for nausea. |
|
|
| Severity of Postoperative Nausea and Vomiting (RINVR Score) |
Measured using the Rhodes Index of Nausea, Vomiting, and Retching (RINVR). It evaluates 8 dimensions: frequency/duration/distress of nausea; frequency/amount/distress of vomiting; and frequency/distress of retching. Total score range is 0-32, with 0 indicating no nausea, 1-8 mild, 9-16 moderate, 17-24 severe, and 25-32 great nausea. The higher scores indicate worse PONV. |
| Measured at 2, 6, 12, and 24 hours post-surgery |
| Number of Rescue Doses Required | Total number of rescue antiemetic (metoclopramide 10 mg IV) doses administered to each patient within the first 24 hours. | First 24 hours after surgery |
| Patient Satisfaction with Antiemetic Treatment | Patient-reported satisfaction measured on a 5-point Likert scale (Very Dissatisfied to Very Satisfied) at the end of hospital stay. Likert scale is a 5-point psychometric survey scale, with 1 indicating very disappointing and 5 indicating very satisfying. The higher the score, the better the treatment was. | At hospital discharge (approximately 24 hours post-surgery) |
| Background |
| Naguib M, el Bakry AK, Khoshim MH, Channa AB, el Gammal M, el Gammal K, Elhattab YS, Attia M, Jaroudi R, Saddique A. Prophylactic antiemetic therapy with ondansetron, tropisetron, granisetron and metoclopramide in patients undergoing laparoscopic cholecystectomy: a randomized, double-blind comparison with placebo. Can J Anaesth. 1996 Mar;43(3):226-31. doi: 10.1007/BF03011739. |
| Background | Chattopadhyay S, Biswas A, SK Samim Ferdows, Bhowmik DK, Dey S, Bi B. Comparison of Ondansetron, Dexamethasone and Ondansetron Plus Dexamethasone For The Prevention of Post-operative Nausea and Vomiting after Laparoscopic Cholecystectomy. Indian Journal of Clinical Anaesthesia. 2025;3(3):459-463. Accessed April 6, 2026. |
| 22263004 | Background | Zhong B. How to calculate sample size in randomized controlled trial? J Thorac Dis. 2009 Dec;1(1):51-4. |
| 41178893 | Background | Korkusuz M, Et T. Effect of perioperative restrictive and liberal fluid regimens on postoperative nausea-vomiting and quality of recovery in laparoscopic cholecystectomy. World J Gastrointest Surg. 2025 Oct 27;17(10):110543. doi: 10.4240/wjgs.v17.i10.110543. |
| 24942194 | Background | Si XY, Wu LP, Li XD, Li B, Zhou YM. Dexamethasone combined with other antiemetics for prophylaxis after laparoscopic cholecystectomy. Asian J Surg. 2015 Jan;38(1):21-7. doi: 10.1016/j.asjsur.2014.04.005. Epub 2014 Jun 15. |
| 22307240 | Background | Mishriky BM, Habib AS. Metoclopramide for nausea and vomiting prophylaxis during and after Caesarean delivery: a systematic review and meta-analysis. Br J Anaesth. 2012 Mar;108(3):374-83. doi: 10.1093/bja/aer509. Epub 2012 Feb 3. |
| 25920297 | Background | Ko-Iam W, Sandhu T, Paiboonworachat S, Pongchairerks P, Junrungsee S, Chotirosniramit A, Chotirosniramit N, Chandacham K, Jirapongcharoenlap T. Metoclopramide, versus its combination with dexamethasone in the prevention of postoperative nausea and vomiting after laparoscopic cholecystectomy: a double-blind randomized controlled trial. J Med Assoc Thai. 2015 Mar;98(3):265-72. |
| 41237407 | Background | Gan TJ, Jin Z, Ayad S, Belani KG, Habib AS, Meyer TA, Urman RD, Andrew BY, Bergese SD, Chung F, Diemunsch P, Kovac AL, Candiotti K, Englesakis M, Grant MC, Hedrick TL, Huang H, Kranke P, Lloyd SJ, Manahan MA, Minkowitz HS, Philip BK, Phillips BJ, Simpson KD, Stever J. Fifth Consensus Guidelines for the Management of Postoperative Nausea and Vomiting: Executive Summary. Anesth Analg. 2025 Nov 14. doi: 10.1213/ANE.0000000000007816. Online ahead of print. No abstract available. |
| 10485781 | Background | Apfel CC, Laara E, Koivuranta M, Greim CA, Roewer N. A simplified risk score for predicting postoperative nausea and vomiting: conclusions from cross-validations between two centers. Anesthesiology. 1999 Sep;91(3):693-700. doi: 10.1097/00000542-199909000-00022. |
| 33075160 | Background | Weibel S, Rucker G, Eberhart LH, Pace NL, Hartl HM, Jordan OL, Mayer D, Riemer M, Schaefer MS, Raj D, Backhaus I, Helf A, Schlesinger T, Kienbaum P, Kranke P. Drugs for preventing postoperative nausea and vomiting in adults after general anaesthesia: a network meta-analysis. Cochrane Database Syst Rev. 2020 Oct 19;10(10):CD012859. doi: 10.1002/14651858.CD012859.pub2. |
| ID | Term |
|---|---|
| D020250 | Postoperative Nausea and Vomiting |
| ID | Term |
|---|---|
| D011183 | Postoperative Complications |
| D010335 | Pathologic Processes |
| D013568 | Pathological Conditions, Signs and Symptoms |
| D009325 | Nausea |
| D012817 | Signs and Symptoms, Digestive |
| D012816 | Signs and Symptoms |
| D014839 | Vomiting |
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| ID | Term |
|---|---|
| D017294 | Ondansetron |
| D003907 | Dexamethasone |
| D002123 | Calcium Dobesilate |
| C018038 | dexamethasone acetate |
| D008787 | Metoclopramide |
| ID | Term |
|---|---|
| D007093 | Imidazoles |
| D001393 | Azoles |
| D006573 | Heterocyclic Compounds, 1-Ring |
| D006571 | Heterocyclic Compounds |
| D002227 | Carbazoles |
| D007211 | Indoles |
| D006574 | Heterocyclic Compounds, 2-Ring |
| D000072471 | Heterocyclic Compounds, Fused-Ring |
| D006575 | Heterocyclic Compounds, 3-Ring |
| D011246 | Pregnadienetriols |
| D011245 | Pregnadienes |
| D011278 | Pregnanes |
| D013256 | Steroids |
| D000072473 | Fused-Ring Compounds |
| D011083 | Polycyclic Compounds |
| D013259 | Steroids, Fluorinated |
| D001557 | Benzenesulfonates |
| D001555 | Benzene Derivatives |
| D006841 | Hydrocarbons, Aromatic |
| D006844 | Hydrocarbons, Cyclic |
| D006838 | Hydrocarbons |
| D009930 | Organic Chemicals |
| D001190 | Arylsulfonates |
| D017739 | Arylsulfonic Acids |
| D013451 | Sulfonic Acids |
| D013456 | Sulfur Acids |
| D013457 | Sulfur Compounds |
| D001549 | Benzamides |
| D000577 | Amides |
| D062366 | para-Aminobenzoates |
| D062365 | Aminobenzoates |
| D001565 | Benzoates |
| D000146 | Acids, Carbocyclic |
| D002264 | Carboxylic Acids |
| D002723 | Chlorobenzoates |
| D062425 | Hydroxybenzoate Ethers |
| D062385 | Hydroxybenzoates |
| D006880 | Hydroxy Acids |
| D010647 | Phenyl Ethers |
| D010636 | Phenols |
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