Dr. Arnel Carmona @ecgrhythms
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Internal Medicine (IMG) , lover of the squiggly lines and all simplistic learning https://twitter.com/ecgrhythms - blogger @ - https://www.ekgrhythm.com/
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Atrioventricular Blocks (AV blocks) - ECG Diagnosis Summary
First Degree AV Block
 • The P wave is
Second Degree AV ... usually on the second ... Second degree AV ... clinically concerning variant ... Block aka Complete
Second degree AV Block type II (aka Mobitz II)
 • There is constant PR interval (normal
Second degree AV ... Block type II ( ... location of the block ... location of the block ... #Second #Degree
Second degree AV Block 2:1
 • During sinus rhythm, 2 to 1 AV block manifest as
Second degree AV ... degree AV block ... degree AV block ... #Second #degree ... #2nd #AVBlock #2to1
Second Degree AV Block Type I aka Mobitz I / Wenckebach 
 • Normal P waves.
Second Degree AV ... Block Type I aka ... usually on the second ... #Second #Degree ... #AVBlock #TypeI
The 4 Variants of Sinus Arrhythmia
Phasic Sinus Arrhythmia:
 • The rate increases with respiration and decreases
The 4 Variants of ... encompassing a QRS complex ... intervening QRS complex ... presence of AV block ... • Variant of
High-grade AV Block aka Advanced AV Block
 • During sinus rhythm, when 2 or more P
High-grade AV Block ... aka Advanced AV Block ... clinically concerning variant ... may progress to complete ... heart block.
Third Degree AV Block aka Complete Heart Block
 • In sinus rhythm with complete AV block,
Third Degree AV ... Block aka Complete ... Heart Block • ... AV block, the PP ... ThirdDegree #3rd #AVBlock
The 4 Variants of Sinus Arrhythmia
Phasic Sinus Arrhythmia:
 • The rate increases with respiration and decreases
The 4 Variants of ... encompassing a QRS complex ... intervening QRS complex ... presence of AV block ... • Variant of