Thread by @ManualOMedicine

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Do Not Confuse Mobitz Type I and Mobitz Type II AV Block - Key Points

➡️ Mobitz type I AV Block is characterized by a lengthening P-R interval and a shortening R-R interval followed by a nonconducted P wave.

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➡️ Mobitz type I AVB produces a characteristic and distinctive pattern of grouped beats on the ECG.

➡️ The most common location of conduction block in Mobitz type I is at the level of the AV node.

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➡️ Mobitz type I AV Block, also known as Wenckebach, is generally seen in younger patients and athletes.

➡️ Most patients with Mobitz type I AVB are asymptomatic and require no additional evaluation or treatment.

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➡️ Mobitz type II AVB is always abnormal, usually associated with significant heart disease, and has a high rate of progression to complete heart block (CHB).

➡️ The conduction delay of Mobitz type II is usually below the AV node.

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➡️ Mobitz type II AVB is characterized by a constant P-R interval with unpredictable nonconducted P waves.

➡️ Unlike type I AVB, there is no distinguishable ECG pattern in type II.

➡️ Patients w/ Mobitz type II require hospitalization and evaluation for pacemaker placement.

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➡️ It is challenging to differentiate between type I and type II AV Block when conduction is in a 2:1 pattern.

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