Abstract 3528: Left Atrium Volume and Contractile Function Measured by Echocardiography is a Powerful Predictor of Successful Surgical MAZE.
Backgroud: Surgical MAZE has been developed for the treatment of atrial fibrillation (AF). However, the potential of echocardiographic parameters that predict success of the treatment is not well defined. Thus, we investigated the prognostic value of echocadiographic variables including left atrium (LA) size and function for maintenance of sinus rhythm after surgical MAZE for AF.
Methods: We investigated 24 consecutive patients (20 men, 60±11 years) who underwent surgical MAZE as an adjunctive therapy for other cardiac surgery. Standard echocardiograpy was recorded before operation. Echocardiographic parameters included LA volume and LA ejection fraction (LAEF), ((maximum LA volume - minimum LA volume) / maximum LA volume), by multi discs methods. 12-lead ECG was recorded 6 months after surgical MAZE to identify maintenance of sinus rhythm.
Result: After 6 months, 20 patients (SR group) were successfully maintained sinus rhythm and remainders (AF group) were AF. Clinical characteristics did not differ between the two groups. LV volume index (volume / body surface area), LV ejection fraction, and maximum LA volume index did not differ between the two groups. Minimum LA volume index was smaller in SR group than AF group (67±22 ml/m2 versus 107±45 ml/m2, p<0.01). LAEF was higher in SR group than AF group (30±13 % versus 10±3 %, p<0.01). LAEF more than 15% was accurately predicted sinus rhythm after surgical MAZE for a sensitivity of 90% and a specificity of 70%.
In Conclusions, noninvasive measurement of LA volume and LAEF by echocardiography is useful and powerful to predict success of surgical MAZE.