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 ... • The QRS complex ... aka Complete Heart
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 ... • The QRS complex ... location of the block
Premature atrial complex (PAC) - ECG Recognition
 • Prematurity and altered P wave morphology.
 • P
Premature atrial ... complex (PAC) - ... interval of > 0.12 seconds ... which will be 0.12 seconds ... PACs #premature #atrial
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 3 Fates of a Premature Atrial Complex
 • PAC can be conducted with normal QRS
of a Premature Atrial ... Complex • PAC ... • PAC can be blocked ... electrocardiogram #premature #atrial ... #complexes
Second degree AV Block 2:1
 • During sinus rhythm, 2 to 1 AV block manifest as
Block 2:1 • During ... degree AV block ... • A 2:1 AV block ... degree AV block ... #2nd #AVBlock #2to1
The 4 Variants of Sinus Arrhythmia
Phasic Sinus Arrhythmia:
 • The rate increases with respiration and decreases
encompassing a QRS complex ... intervening QRS complex ... presence of AV block ... Wandering Atrial
High-grade AV Block aka Advanced AV Block
 • During sinus rhythm, when 2 or more P
High-grade AV Block ... aka Advanced AV Block ... may progress to complete ... heart block. ... #Highgrade #AVBlock
Third Degree AV Block aka Complete Heart Block
 • In sinus rhythm with complete AV block,
Third Degree AV Block ... aka Complete Heart ... Block • In sinus ... rhythm with complete ... AV block, the PP
A Summary slide of Sinoatrial Rhythms 
 • Sinus Rhythm
 • Sinus Arrhythmia
- Wandering Atrial ... • Multifocal Atrial ... • Premature Atrial ... Complexes • Sinoatrial ... Blocks - SAB