AV Blocks – Progressive Conduction Failure: 1. First-Degree AV Block: Consistent delay at the AV node. Prolonged PR interval (>200 ms). Every impulse eventually reaches the ventricles. 2. Mobitz I (Wenckebach): Progressive PR interval lengthening until a P wave is blocked (a QRS is dropped). Typically at the AV node. Usually benign. 3. Mobitz II: Intermittent, sudden failure of conduction without preceding PR prolongation. Block typically infranodal (Bundle of His or below). Carries significant
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AV Blocks – Progressive Conduction Failure: 1. First-Degree AV Block: Consistent delay at the AV node. Prolonged PR interval (>200 ms). Every impulse eventually reaches the ventricles. 2. Mobitz I (Wenckebach): Progressive PR interval lengthening until a P wave is blocked (a QRS is dropped). Typically at the AV node. Usually benign. 3. Mobitz II: Intermittent, sudden failure of conduction without preceding PR prolongation. Block typically infranodal (Bundle of His or below). Carries significant
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Dr. Hayley McDonald | Specialist Veterinary Cardiologist on Instagram: "What happens when the atria and ventricles stop talking? 🫣 ➡️ First-degree AV block: conduction through the AV node is delayed —> prolongation of the PR interval ➡️ Second-degree AV block: Intermittent blockage of conduction through the AV node —> intermittent P with no QRS-T ➡️ Third-degree AV block (complete heart block): All conduction through the AV node is blocked —> there is no association between P waves and QRS-T co
Dr. Hayley McDonald | Specialist Veterinary Cardiologist on Instagram: "What happens when the atria and ventricles stop talking? 🫣 ➡️ First-degree AV block: conduction through the AV node is delayed —> prolongation of the PR interval ➡️ Second-degree AV block: Intermittent blockage of conduction through the AV node —> intermittent P with no QRS-T ➡️ Third-degree AV block (complete heart block): All conduction through the AV node is blocked —> there is no association between P waves and QRS-T co
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