The PR Interval & PR segment – The Cardiovascular
The PR Interval & PR segment – The Cardiovascular
Jan 6, 2025
ecgwaves.com
EKG Heart Blocks as Dances 🫀🕺 🫀First-Degree Heart Block Prolonged PR interval (greater than 0.20 seconds) 💡If the R is far from the P, then you have a FIRST-DEGREE 🫀Second-Degree Heart Block Mobitz I (Wenckebach) PR intervals become increasingly LONGER until an entire QRS complex (beat) is missed 💡”Longer, longer, longer... DROP — that’s Wenckebach! 🫀Second-Degree Heart Block Mobitz II PR intervals are equal in length and do not elongate, yet SOME ARE SIMPLY not followed by a QRS complex
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PR Interval: A Comprehensive Guide
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2nd Degree #MOBITZ Type 1 Heart Block. This is #Wenckebach phenomenon whereby the PR interval gets progressively prolonged until a QRS complex is dropped and then comes back and the cycle continues.. www.facebook.com/anesthesia1 | Anesthesia
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AV Block: 2nd degree, Mobitz I (Wenckebach Phenomenon)
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litfl.com
First-Degree AV Block:🔍 A fixed delay in conduction at the AV node. Not a blockage, but a slowdown. 🔹 Diagnostic ECG Criteria ▸PR Interval: >200 ms (≥ 1 large box). ▸Rhythm: Regular sinus. ▸Conduction: 1:1 (Every P → QRS). ▸Constancy: Fixed PR interval. 💡 Clinical Pearls ▸Often Benign: Asymptomatic; common with high vagal tone, athletes, or medications (BB, NDHP-CCB, digoxin). ▸Context Matters: Assess for underlying heart disease, ischemia, or electrolytes. New onset in acute settings require
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This is FIRST-degree heart block! In this rhythm, the atrial impulse is delayed and travels to the ventricles slower 🐢 than normal. So the time from the P wave (the atria contracting) to the QRS complex (the ventricles contracting), is longer! How do we know? The PR interval is greater than 0.20 seconds (one big box)! 🧠 Memory trick for first degree heart block...If the R is far from P, then you have a FIRST degree! Follow Archer NCLEX Review for more heart block tips to know for nursing schoo
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