Pre-operative Olanzapine as Prophylactic Antiemetic in Oncologic Patients

Postoperative Nausea and Vomiting Clinical Trial

Official title: Pre-operative Olanzapine as Prophylactic Antiemetic in Oncologic Patients

Status Completed

Clinical Trial Summary

Olanzapine has been used as prophylactic antiemetic for chemotherapy induced nausea and vomiting.

The project aims to evaluate the efficacy of olanzapine in combination with ondansetron and dexamethasone in patients at high risk of postoperative nausea and vomiting, with previous history of nausea and vomiting induced by prior chemotherapy, submitted to medium and large surgery.

Clinical Trial Description

Double blinded randomized clinical trial. Fifty patients will be selected for each group. Group A will receive 10mg olanzapine in the preoperative and group B will receive placebo in the preoperative period. Both groups will receive intravenous general anesthesia combined with epidural. All patients will receive epidural PCA.

The primary outcome of this study is the incidence of post-operative nausea and vomiting. The power of analysis was based on the following parameters: type error I (α = 0.05), error II (β = 0.8), 95% confidence interval and hypothesis test two-tailed. Thus, 42 patients are indicated per group to obtain reduction of the incidence of nausea and / or vomiting of the population risk from 60% to 30%. The population will be composed of 100 patients because it is assumed that percentage of loss of 10% per group.

The statistical analysis will be performed in program R version 3.5.1. The results obtained will be presented as mean + standard deviation for continuous data or absolute frequency for described data.

For quantitative variables, the Student's t-test will be used for with normal distribution or Mann-Whitney for non-distributed data normal.

For qualitative variables, the chi-square test will be used or Fisher's exact test. Significant difference is defined as p, 0.05.

Data will be collected and managed using REDCap data capture tools ;

Related Conditions & MeSH terms

• Nausea
• Postoperative Nausea
• Postoperative Nausea and Vomiting
• Vomiting

• NCT number: NCT03631004
• Study type: Interventional
• Source: Instituto do Cancer do Estado de São Paulo
• Status: Completed
• Phase: Phase 2/Phase 3
• Start date: October 1, 2018
• Completion date: February 10, 2021