Serum prolidase activity in patients with left ventricular diastolic dysfunction

Objectives Prolidase is an important factor in collagen metabolism, matrix remodelling and cell growth. Increased collagen turnover leading to increased ventricular stiffness plays an important role in the pathophysiology of left ventricular diastolic dysfunction (LVDD).This study aims to investigate whether serum prolidase activity is related to left ventricular diastolic function. Methods We studied 144 participants, and divided them into four groups according to the phase of diastolic dysfunction (66 with normal function, 46 with impaired relaxation, 19 with pseudonormalization, and 13 with restrictive-like filling). Assessment of diastolic filling was carried out with the measurements of E wave, A wave, E-wave deceleration time, isovolumic relaxation time, lateral tissue Doppler ES, E and A wave. Serum prolidase activity was measured by spectrophotometrical methods. Results Serum prolidase activity level was higher in patients with left ventricular diastolic dysfunction (LVDD) than without LVDD (P=0.004). Also, prolidase activity values gradually increased from stage I through stage III in patients with LVDD. Multivariate analysis shows that LVDD is independently associated with age (beta=0.066, SE=0.017, P=0.006), hypertension (beta=-1.252, SE=0.354, P=0.037) and prolidase activity (beta=0.021, SE=0.088, P=0.045). Conclusion Our data have shown that, in a selected group of patients, serum prolidase activity was positively and independently associated with the presence and severity of LVDD.