Effect Analysis Of AP Valve Replacement In Patients With Small Aortic Root

Objective: To summarize the AP aortic mechanical valve replacements in patients with small aortic roots, and to improve the outcomes.Methods: For 62 patients with small aortic roots who underwent the AP aortic mechanical valve replacements, and for 62 cases with non-small aortic roots who underwent the conventional aortic mechanical valve replacements from November 2008 to March 2016, the Doppler echocardiogram were used to assess effective orifice area index, left ventricular ejection fraction, left ventricular fractional shortening, left ventricular end diastolic diameter and across-aortic valve peak pressure differential preoperatively and post operatively. The outcomes of those cases were evaluated, and prosthesis-patient mismatch(PPM) was studied.Results: Comparing with those before operation, there was a significant reduction in the left ventricular mass index and peak pressure gradients across aortic valve in all patients. there was a increase in effective orifice area index, left ventricular ejection fraction, left ventricular fractional shortening of all patients through Doppler echocardiography 1 week after operation. Those index improvement showed no significant difference 1months after operation between the AP aortic mechanical valve replacement group and the conventional aortic mechanical valve replacement.Conclusion: Patients with small aortic roots who underwent the AP aortic mechanical valve replacements and those with non-small aortic roots who underwent the conventional aortic mechanical valve replacements,those index and hemodynamic effects all have improved though Doppler echocardiography 1 week after operation. In the patients with small aortic roots who underwent the AP aortic mechanical valve replacements, there was no prosthesis-patient mismatch(PPM). The left ventricular function and hemodynamic effects was significantly improved, and they are close to the same as that of normal mechanical valve replacement.