ABSTRACT
BACKGROUND: The Rhodes index of nausea, vomiting and retching (RINVR) is a reliable and valid instrument to assess PONV. The purpose of this study was to investigate the incidence of PONV in high risk group with using RINVR. METHODS: Patients scheduled for elective surgery under general anesthesia were classified in three groups (group I:two risk factors, group II:three risk factors, group III:four risk factors) by using a simplified risk score.We investigated the incidences of PONV in each group. RESULTS: The incidence of PONV was 12.8% in group I, 25% in group II, and 33.1% in group III, which showed a significant difference between group I and group II, between group I and group III.The incidence of PONV, which was over moderate was significantly increased in group III. CONCLUSIONS: For patients with three or four risk factors a multimodal antiemetic strategy should be considered.
Subject(s)
Humans , Anesthesia, General , Incidence , Nausea , Postoperative Nausea and Vomiting , Risk Factors , VomitingABSTRACT
BACKGROUND: The Rhodes index of nausea, vomiting and retching (RINVR) is a patient self-report instrument to assess the objective and subjective factors of nausea and vomiting. The aim of this study is to evaluate the reliability and validity of the RINVR in postoperative nausea and vomiting (PONV). METHODS: The RINVR, VAS for nausea and incidence of emetic episodes were administered to 150 patients approximately 30 minutes apart at 6 hours and 24 hours after surgery. The validity was evaluated by Spearman's correlation and internal consistency of reliability was determined using Cronbach's alpha. To determine test-retest reliability, second administration of the RINVR was done 2 hours after the first. The test-retest reliability was evaluated by Spearman's correlation and agreement. RESULTS: Cronbach's alpha of nausea, vomiting, retching and total experience scores of the RINVR ranged from 0.912 to 0.968. Test-retest scores of all items were strongly correlated (Spearman's coefficients: 0.962-1.000, P< 0.0001) and highly agreed (weighted kappa: 0.932-1.000). Coefficients of construct validity for nausea components (vs VAS for nausea) and emetic components (vs incidence of emetic episodes) of the RINVR were 0.860-0.928 and 0.724-0.811, respectively (P<0.0001). The overall weighted kappa between the incidences of PONV assessed by the RINVR and by patient self-assessment of VAS for nausea and incidence of emetic episodes was 0.917-0.945. The number of patients in "great" total experience category was 1.33% or less. There was no significant difference of VAS for nausea between "severe" and "great" nausea experience categories. CONCLUSIONS: The RINVR was a reliable and valid instrument to assess PONV.