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🫀 For more EKG help check out our EKG Cheat Sheet , link in our LinkTree🫶🏼 Second degree heart block type 1, also known as Wenckebach or Mobitz 1, is a type of abnormal heart rhythm that affects the electrical conduction system of the heart. It is characterized by a progressive lengthening of the PR interval on an electrocardiogram (ECG) until a QRS complex is dropped. The PR interval is the time it takes for the electrical impulse to travel from the atria to the ventricles.⁣ ⁣ In second-degree heart block type 1, there is a delay in the transmission of electrical signals through the AV node, leading to a progressive lengthening of the PR interval (the time it takes for the electrical impulse to travel from the atria to the ventricles). ⁣ ⁣ The characteristic pattern of second-degree heart block type 1 is as the electrical impulses repeatedly pass through the AV node, the PR interval progressively lengthens until one impulse fails to reach the ventricles, resulting in a “dropped beat.” Following the dropped beat, the cycle begins again with a shorter PR interval and gradually lengthens until the next dropped beat occurs. This cyclic pattern of PR interval lengthening followed by a dropped beat is known as the Wenckebach phenomenon.⁣ ⁣ Causes of second-degree heart block type 1 can vary and may include structural heart disease, medications (such as beta-blockers, calcium channel blockers, or digoxin), myocardial ischemia (reduced blood flow to the heart muscle), or degeneration of the electrical conduction system. In some cases, it can occur transiently during sleep or as a physiological response to increased vagal tone (parasympathetic nervous system dominance).⁣ ⁣ Treatment for second-degree heart block type 1 depends on the severity of symptoms. Asymptomatic cases may not require any specific intervention. For symptomatic individuals or those at risk of progression, treatment options may include medications, temporary or permanent pacemaker implantation, and addressing any underlying causes or contributing factors.⁣

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