If a person with ECG signs of SND is symptomatic, the condition is classified as sick sinus syndrome (SSS). Also note that bradycardia due to dysfunction in the sinoatrial node is referred to as sinus node dysfunction (SND). Note that escape rhythms may arise during bradycardia. Causes of bradycardia: sinus bradycardia, sinoatrial block, sinoatrial arrest/inhibition, second-degree AV block, third-degree AV block.Sinus rhythm (which is the normal rhythm) has the following characteristics: (1) heart rate 50–100 beats per minute (2) P-wave precedes every QRS complex (3) the P-wave is positive in lead II and (4) the PR interval is constant.P-waves should precede every QRS complex and the P-wave should be positive in lead II.Is atrial rhythm regular? What is the atrial rate (beats/min)?.Is ventricular rhythm regular? What is the ventricular rate (beats/min)?.Assess ventricular (RR intervals) and atrial (PP intervals) rate and rhythm:
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