What are the two major types of 2nd degree AV block?

What are the two major types of 2nd degree AV block?

• A. Wenckebach block and Mobitz type 1 block
• B. Mobitz type 1 and Mobitz type 2 block
• C. Type A and Type B block
• D. Atrial and ventricular block types

Answer: (B)

Second-degree AV block is characterized by the incomplete transmission of electrical impulses from the atria to the ventricles, leading to missed beats. The two major types of second-degree AV block are widely recognized as Mobitz type 1 (also known as Wenckebach) and Mobitz type 2. Mobitz type 1 block, characterized by progressively lengthening PR intervals until a beat is dropped, reflects a gradual worsening of conduction before failure. This block is usually considered less severe, often seen in younger individuals and can sometimes resolve without intervention. Mobitz type 2 block, on the other hand, presents with a consistent PR interval followed by sudden dropped beats. This type is generally more concerning, as it has been associated with a higher risk of progression to complete heart block and requires more serious clinical management. Identifying the correct types is crucial for appropriate assessment and treatment, which is why Mobitz type 1 and Mobitz type 2 are recognized as the definitive classifications of second-degree AV block. The other options, while they may represent other forms of av conduction issues or types not standardly used for second-degree AV block classification, do not accurately represent the universally accepted terms.

Second-degree AV block is characterized by the incomplete transmission of electrical impulses from the atria to the ventricles, leading to missed beats. The two major types of second-degree AV block are widely recognized as Mobitz type 1 (also known as Wenckebach) and Mobitz type 2.

Mobitz type 1 block, characterized by progressively lengthening PR intervals until a beat is dropped, reflects a gradual worsening of conduction before failure. This block is usually considered less severe, often seen in younger individuals and can sometimes resolve without intervention.

Mobitz type 2 block, on the other hand, presents with a consistent PR interval followed by sudden dropped beats. This type is generally more concerning, as it has been associated with a higher risk of progression to complete heart block and requires more serious clinical management.

Identifying the correct types is crucial for appropriate assessment and treatment, which is why Mobitz type 1 and Mobitz type 2 are recognized as the definitive classifications of second-degree AV block. The other options, while they may represent other forms of av conduction issues or types not standardly used for second-degree AV block classification, do not accurately represent the universally accepted terms.