Objective: To evaluate the impact of early ambulation on the functionality of patients undergoing cardiac valve replacement surgery. Methods: Prospective cohort study in patients undergoing cardiac valve replacement surgery. Patients had their functionality assessed preoperatively using the Functional Independence Measurement (FIM) and Perme Intensive Care Unit Mobility Score scales. At ICU discharge, they were divided into two groups: walking group (WG) and, non-walking group (NWG). At discharge, the two functional scales were reapplied in these patients. Results: 170 patients were evaluated, 110 (65%) male, with a mean age of 48 ± 2 years. In relation to Perme Score, the WG had a decrease of 11 ± 2 and in the NWG the decrease was 13 ± 2 (p=0.34). Regarding FIM, those who walked had a decrease of 27 ± 3 against those who did not walk, which reduced 36 ± 5, with a significance level of p<0.001. Conclusion: Based in the FIM data found, patients undergoing cardiac valve replacement surgery who underwent early mobilization had less decrease of functionality compared to patients who did not ambulate.