Cardiology In Critical Care
Lethal Dysrhythmias of the Heart
Sinus Arrest / Sinus Block
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Sinus Arrest/Sinus Block
A. The sinus node Mis to function for a prolonged period. In
sinus block, me sinus node functions, hut the impulse is not
conducted to the ventricles.
B. Chnical Significance - will led to cardiac arrest with
asystole unless another pacemaker takes over.
1. Junctional pacemaker - inherent pacemaker of 40-60/min.
2. Ventricular pacemaker - 2040/min.
C. Characteristics
1. In sinus arrest, there are no P waves; QRS waves will present only if an escape pacemaker has taken over.
Treatment
1. Atropine
2. CPR if episode is prolonged and patient becomes hemodynamicdly unstable.
3. Transcutaneous or transvenous pacemaker.
