Which of the following is seen in second degree AV block-: (A) Change in morphology of ventricular complex, (B) Increased atrial rate compared to ventricular rate, (C) Increase in cardiac output, (D) Decrease in stroke volume
Answer is A. There are two non-distinct types of second-degree AV block, called Type 1 and Type 2. In both types, a P wave is blocked from initiating a QRS complex; but, in Type 1, there are increasing delays in each cycle before the omission, whereas, in Type 2, there is no such patterns Second-degree atrioventricular (AV) block, or second-degree hea block, is a disorder characterized by disturbance, delay, or interruption of atrial impulse conduction to the ventricles through the atrioventricular node (AVN) and bundle of His. Electrocardiographically, some P waves are not followed by a QRS complex Ref Harrison 20th edition pg 1423