Second Degree Heart Block Type II ECG Interpretation with Sample Strip


ECG Strip

Second Degree Heart Block Type II ecg rhythm strip


Second Degree Heart Block Type II Rhythm Strip Features

Rate: Characterized by Atrial rate usually faster than ventricular rate (usually slow)
Rhythm: Regular (atrial) and irregular (ventricular)
P Wave: Normal form, but more P waves than QRS complexes
PR Interval: Normal or prolonged
QRS: Normal or wide
A constant P-R interval with missing QRS complexes. Occurring in a specific pattern in a ratio with the P waves.
Second degree Heart Block Mobitz II is characterized by intermittently non-conducted P waves which are not preceded by PR prolongation and are not followed by PR shortening. Mobitz II is usually caused by conduction failure/delay of the His-Purkinje system. In three out of four cases, this conduction block is located distal to the Bundle of His, creating wide QRS complexes. In the other 25% of cases, the block is located within the Bundle of His, producing narrower QRS complexes.
External Source: http://http://texasheart.org/HIC/Topics/Cond/bbblock.cfm
Texas Heart Institute


Authors and Sources

Authors and Reviewers


Sources

  • Electrocardiography for Healthcare Professionals, 6th Edition Kathryn Booth and Thomas O'Brien
    ISBN10: 1265013470, ISBN13: 9781265013479
    McGraw Hill, 2023
  • Rapid Interpretation of EKG's, Sixth Edition
    Dale Dublin
    Cover Publishing Company
  • EKG Reference Guide
    EKG.Academy
  • 12 Lead EKG for Nurses: Simple Steps to Interpret Rhythms, Arrhythmias, Blocks, Hypertrophy, Infarcts, & Cardiac Drugs
    Aaron Reed
    Create Space Independent Publishing
  • Heart Sounds and Murmurs: A Practical Guide with Audio CD-ROM 3rd Edition
    Elsevier-Health Sciences Division
    Barbara A. Erickson, PhD, RN, CCRN
  • The Virtual Cardiac Patient: A Multimedia Guide to Heart Sounds, Murmurs, EKG Jonathan Keroes, David Lieberman
    Publisher: Lippincott Williams & Wilkin)
    ISBN-10: 0781784425; ISBN-13: 978-0781784429
  • Project Semilla, UCLA Emergency Medicine, EKG Training Breena R. Taira, MD, MPH
  • ECG Reference Guide
    PracticalClinicalSkills.com

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