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Abstract Objectives This study's primary purpose was to demonstrate the correlation of preoperative right ventricular free‐wall longitudinal strain (RVFWLS) and pre‐/postsurgical variation in strain (delta strain) with the clinical and echocardiographic diagnosis of right ventricular dysfunction. Its secondary purpose was to determine the correlation of RVFWLS and delta strain with length of stay (LOS) in the intensive care unit (ICU), ventilation days, trend of natriuretic peptide test. (NT‐proBNP) and lactate in the first 48 h, incidence of acute renal failure, and 28‐day mortality. Design Prospective observational study. Setting Cardio‐thoracic and Vascular Anaesthesia Department and ICU of the University Hospital Integrated Trust of Verona. Participants Patients scheduled for mitral surgery. Interventions None. Measurements and Main Results All clinical and transoesophageal echocardiographic (TEE) parameters were collected at baseline, before surgery (T1) and at admission in the ICU postsurgery (T2). During the postoperative period, the clinical and echocardiographic diagnoses of right, left, or biventricular dysfunction were evaluated. TEE parameters were evaluated by a cardiologist offline. The patients were divided into two subgroups according to the development of any type of ventricular dysfunction. No statistically significant differences emerged between the two groups. According to a logistic regression model, a T1‐RVFWLS value of −15% appeared to predict biventricular dysfunction (sensitivity: 100%; specificity: 91.3%). No correlation between T1‐ or T2‐RVFWLS and creatinine, hours of ventilation or ICU LOS was found. Conclusions Our study introduces a new parameter that could be used in perioperative evaluations to identify patients at risk of postoperative biventricular dysfunction.