Evaluation of the role of vena cava inferior collapsibility index determined by ultrasound before spinal anesthesia in predicting hemodynamic changes after spinal anesthesia

The role of vena cava inferior collapsibility index determined by ultrasound before spinal anesthesia in predicting hemodynamic changes that may occur after spinal anesthesia Aim: We aimed to investigate the effectiveness of this value in predicting the occurrence of hypotension by calculating the preoperative vena cava inferior collapsibility index value of patients scheduled for operation under spinal anesthesia. Material-Methods: Between November 2018- January 2020, at Adnan Menderes University Hospital, patient who will undergo orthopedic surgery and who meet the criteria were included in the study. The demographic information of the patients and end-inspirium and end-expirium of the diameter values of vena cava inferior were recorded. According to these values, inferior vena cava collapsibility index was calculated. The patients were classified into two groups as IVC-CI above %40 (Grup 1) and below % 40 (Grup 2). After arrival to the operation room and undergoing spinal anesthesia, the patient's systolic, diastolic blood pressure, mean arterial blood pressure and heart rate were measured until 30th minute at 5-minute intervals. Five minutes after the process was applied, the block level was calculated by pinprick test. Complications during the operation were recorded. Findings: In group 1 patients, there was a statistically significant decrease in systolic blood pressure at 0, 5, 10, 15, 20, 25 and 30 minutes, diastolic blood pressure at 15 minutes, mean arterial pressure at 15 and 20 minutes has been observed too much. There was no statistically significant difference in the other complications seen in the patients, the amount of fluid given to the patients, the amount of vasopressor used and the amount of bleeding. Results: We concluded that the use of USG, which is a noninvasive method, will be useful in predicting hypotension that occurs after spinal anesthesia, which is one of the important problems of regional anesthesia practice. We think that it may be beneficial to conduct additional studies with more patients in different centers. Key words: Inferior Vena Cava Collapsibility Index, Spinal Anesthesia, Hypotension, Hemodynamic Changes