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Summary of Heart Blocks
1st Degree Heart Block:
 • Prolonged PR >200ms (5 small squares).
 • Narrow
• Prolonged PR ... Treatment 2nd Degree, Mobitz ... • Prolonged PR ... . 2nd Degree, Mobitz ... HeartBlocks #Types #Classification
Atrioventricular Blocks (AV blocks) - ECG Diagnosis Summary
First Degree AV Block
 • The P wave is
PR interval ... Block Type I aka Mobitz ... There is constant PR ... • The PR interval ... electrocardiogram #classification
Type 1 Second-degree AV block, also known as Mobitz I or Wenckebach periodicity, is almost always
also known as Mobitz ... prolongation of the PR ... QRS complex, the PR ... MedStudent #EKG #MobitzI ... #Mobitz1 #Mobitz
Type 1 Second-degree AV block, also known as Mobitz I or Wenckebach periodicity, is almost always
also known as Mobitz ... prolongation of the PR ... QRS complex, the PR ... MedStudent #EKG #MobitzI ... #Mobitz1 #Mobitz
Second degree AV Block type II (aka Mobitz II)
 • There is constant PR interval (normal
Block type II (aka Mobitz ... There is constant PR ... AVBlock #TypeII #MobitzII ... electrocardiogram #Mobitz2
Mobitz II heart block is characterized on a surface ECG by intermittently nonconducted P waves not
Mobitz II heart ... not preceded by PR ... not followed by PR ... in describing Mobitz ... #Mobitz2 #Mobitz
Second Degree Heart Block, Mobitz Type I (Wenckebach)

P waves and QRS complexes are normal but... 
•
Degree Heart Block, Mobitz ... • PR interval ... the AV node #Mobitz
Second Degree Heart Block, Mobitz Type II

• p waves are normal 
• QRS complexes are usually
Degree Heart Block, Mobitz ... branch block • PR ... His-Purkinje system #Mobitz
Pacemaker Placement Indications
Class I:
 • Third degree block
 • Advanced 2nd degree block
 • Symptomatic Mobitz
• Symptomatic Mobitz ... I or II • Mobitz ... block Class II: • Mobitz ... arrest, prolonged PR ... , Mobitz I without
Approach to ECGs - Tachy/Bradyarrhythmias
Tachyarrhythmias - HR > 100
Wide
  (1) VT - DANGER
  (2)
block 1º - long PR ... longer pause 2º - Mobitz ... successively longer PR ... 3, etc.) 2º - Mobitz ... II / Mobitz - ,