Anesthesia for cardiac surgery carries additional risks of hemodynamic deterioration, with hypovolemia being a possible trigger. Diagnosis and management will largely depend on the clinical judgment of the anesthesiologist in interpreting and controlling said hemodynamic changes. The purpose of this study was to measure the inferior vena cava collapsibility index (ICVCI) as a predictor of hypovolemia in patients undergoing myocardial revascularization or aortic valve replacement and its relationship with hemodynamic variables during anesthetic induction. A cross-sectional observational design was used, developed at the La Cardio Foundation in Bogotá, Colombia. In patients taken to 2 types of cardiovascular surgeries. Anesthesia records, clinical history and images were reviewed; and the variables were analyzed in JASP v 0.17.1. A total of 60 patients were included, of whom 40 underwent myocardial revascularization (MVR) and 20 aortic valve replacement (AVR). The proportion of hypovolemia (ICVCI greater than 30%) was 67% (40). No differences were found between the groups when they were compared according to the cut-off point of 30% to define hypovolemia by ICVCI. The mean ICVCI for myocardial revascularization was 32.7 (95% CI; 30.5-34.8) versus 29.33 (95% CI; 25.6-33-0) in aortic valve replacement. The cut-off value of 30% did not show a statistically significant relationship with fasting or with the hemodynamic variables during anesthetic induction.