Role of echocardiography in differential diagnosis of broad complex XXXX .

@entity1 @entity1165 @entity591 @entity2611 @entity4710
It is not always easy to distinguish between @entity4710 with aberration and @entity1165 by electrocardiographic analysis alone. M mode echocardiography can often help by providing direct or indirect evidence of the relation between atrial and ventricular contraction. Sixteen consecutive @entity1 with spontaneous sustained @entity2611 complex @entity591 with heart rates of 120-225 beats/minute were examined. Echocardiographic evidence of 1:1 conduction was seen in three cases and 2:1 atrioventricular conduction in one (all four had @entity4710 , confirmed by intracardiac electrocardiography in three). Evidence of retrograde block was seen in 12 (all had @entity1165 , with electrophysiological confirmation in 10). Satisfactory views of the mitral valve were obtained in all @entity1 . @entity1 with @entity1165 had a variable mitral valve opening time (range 42-110%) compared with those who had @entity4710 (9-15%). Aortic root and left atrial views gave direct evidence of atrial contraction in three cases, and subcostal right atrial wall views were diagnostic in four of five cases. Seven @entity1 with @entity1165 had been wrongly diagnosed elsewhere as having @entity4710 . This study confirms that echocardiography is a simple and rapid aid to accurate diagnosis in @entity1 with @entity2611 complex @entity591 .
