642 results
Summary of Heart Blocks
1st Degree Heart Block:
 • Prolonged PR >200ms (5 small squares).
 • Narrow
• Prolonged PR ... • Prolonged PR ... PR longest before ... PR shorted after ... electrocardiogram #ecg #cardiology
Wolff-Parkinson-White Syndrome

WPW is a congenital abnormality characterized by an abnormal accessory conduction pathway between the atria
delta wave, short PR ... msec) 3 Short PR ... interval (PR < ... WolffParkinsonWhite #WPW #Cardiology
Typical ECG changes in acute pericarditis includes: stage 1 - diffuse, positive, ST elevations with reciprocal
Elevation of PR ... depression of PR ... normalization of ST and PR ... Diagnosis #EM #IM #Cardiology
Pericarditis on EKG
Stage 1 - Widespread ST elevation (<5mm) and PR depression; In aVR: ST depression
elevation (<5mm) and PR ... depression and PR ... electrocardiogram #cardiology
Antiarrhythmics - Vaughan Williams Classification
Class I (Ia, Ib, Ic) - Na+ Channel Blockade
 • Slows depolarization
rate and prolongs PR ... rate and prolongs PR ... Classification #Classes #cardiology
Second Degree Heart Block, Mobitz Type I (Wenckebach)

P waves and QRS complexes are normal but... 
•
PR interval ... HeartBlock #Diagnosis #Cardiology
Type 1 Second-degree AV block, also known as Mobitz I or Wenckebach periodicity, is almost always
prolongation of the PR ... QRS complex, the PR ... Clinical #EM #IM #Cardiology
Second Degree Heart Block, Mobitz Type II

• p waves are normal 
• QRS complexes are usually
branch block • PR ... HeartBlock #Diagnosis #Cardiology
Multifocal Atrial Tachycardia (MAT) on EKG
 • Heart rate > 100 bpm (usually 100-150 bpm)
 •
with varying PP, PR ... Tachycardia #diagnosis #cardiology
Type 1 Second-degree AV block, also known as Mobitz I or Wenckebach periodicity, is almost always
prolongation of the PR ... QRS complex, the PR ... Clinical #EM #IM #Cardiology