The basic rhythm is sinus tachycardia at 145 beats/min. Every third P wave is occurring prematurely, hence, atrial trigeminy. When they occur very early (↓), the atrioventricular (AV) conduction ...
The QRS complex is positive in lead I and negative in lead II and also negative in lead aVF – indicating left axis deviation TIP When you see RBBB always look for 1 st degree heart block and/or left ...
Paired narrow QRS complexes, each preceded by a P wave, certainly raise the possibility of atrial bigeminy. But there are other causes of paired QRS complexes during sinus rhythm. One should look ...
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