Effect of Cibenzoline and Atenolol Administration on Dynamic Left Ventricular Obstruction Due to Sigmoid-Shaped Septum

Obstruction of the left ventricular outflow tract (LVOT) is usually complicated by hypertrophic cardiomyopathy or left ventricular hypertrophy. It occurs rarely in cases of sigmoid-shaped septum (SS), which are considered as a normal part of the aging process. The 2 cases of SS with obstruction of the LVOT were observed. Their complaints were dyspnea on effort and exercise increased the left ventricular pressure gradient. In both cases, atenolol administration decreased rest pressure gradient. Moreover, additional cibenzoline administration decreased the pressure gradient caused by exercise. It is emphasized that dual therapy with cibenzoline and atenolol is effective in resolving the obstruction of the LVOT caused by SS. (Circ J 2008; 72: 2087 - 2091)