Figure 031_3152. Electrocardiography (ECG) of a patient with sinus node dysfunction: A , second-degree sinoatrial block, Mobitz type I (Wenckebach); B , advanced second-degree sinoatrial block. Figure courtesy of Dr Andrzej Stanke. - McMaster Textbook of Internal Medicine

Figure 031_3152.
Electrocardiography (ECG) of a patient with sinus node dysfunction: A, second-degree sinoatrial block, Mobitz type I (Wenckebach); B, advanced second-degree sinoatrial block. Figure courtesy of Dr Andrzej Stanke.

Figure 031_3152. Electrocardiography (ECG) of a patient with sinus node dysfunction: A , second-degree sinoatrial block, Mobitz type I (Wenckebach); B , advanced second-degree sinoatrial block. Figure courtesy of Dr Andrzej Stanke.