Fig. 1From: General anesthesia in a patient with asymptomatic second-degree two-to-one atrioventricular blockPreoperative electrocardiogram. The tracing of lead II shows second-degree atrioventricular block with 2:1 AV conduction, ventricular rate of 46 beats per minute. Every other P wave (marked) was regularly conducted. Note the short PR interval during conducted complexes and the narrow QRS complexesBack to article page