The role of measurement of inferior vena cava collapsibility index in predicting hypotension after general anesthesia induction

Aim: The aim of our study is to evaluate the sensitivity and specificity of the Inferior Vena Cava Collapsibility Index (IVC-CI) in predicting hypotension following anesthesia induction. Method: At Dicle University Medical Faculty Hospital, the IVC-CI was calculated for patients undergoing elective surgical procedures before the operation. The patients were divided into two groups accordingly. Patients were hemodynamically monitored during the intraoperative and postoperative periods. The occurrence of hypotension was evaluated based on predetermined criteria. Results: A total of 49 patients were included in our study. The patients' mean age was 40.32 ± 11.06 years, and their Body Mass Index (BMI) was 26.53 ± 3.97 kg/m². Of our patients, 65.3% (n=32) were female and 34.7% (n=17) were male. Among the patients, 32.5% (n=16) were in the Collapsibility Index + (CI+) group, and 67.5% (n=33) were in the CI- group. Hypotension developed in 24.2% (n=8) of patients in the CI- group during monitoring. In the CI+ group, 56.3% of the patients developed hypotension (p=0.027). Conclusion: There is no clearly defined cut-off value for IVC-CI. However, based on previous studies, this value is likely to be between 40-50%. Considering the other demographic characteristics and parameters of the patient, we recommend calculating the IVC-CI before each surgical procedure and taking necessary precautions during and after the procedure accordingly. Keywords: Collapsibility, Hypotension, Anesthesia, Ultrasonography