ECG and Rhythm Interpretation Part II: Blocks, Axis, and
Hypertrophy Answered 100% Correctly 50 Q and A's | Latest
UPDATE 2025.
1|Page
, Evaluating the ECG
• What are the seven steps in evaluating an ECG?
1. Rate
2. Rhythm
3. Blocks
4. Axis
5. Hypertrophy
6. Myocardial damage
7. Special issues
2|Page
, Heart Blocks
• What are common heart blocks?
– Blockage of electrical conduction which prevents the
passage of electrical stimuli
• Sinus: occur in SA node
• AV: occur in AV node
• Bundle branch: occur in the bundle of His into
Bundle Branches
• Hemiblock: occur in the anterior or posterior
division of the left bundle branch
3|Page
, Sinus Blocks
• What happens with a sinus node block?
– SA nodes stops pacing for at least one cycle
– After the pause, heart resumes pacing at same rate
– An escape beat from an ectopic foci may occur
P waves with blocked
QRS’s
Contributed by
www.cardiologyreviewonline.com
4|Page
Hypertrophy Answered 100% Correctly 50 Q and A's | Latest
UPDATE 2025.
1|Page
, Evaluating the ECG
• What are the seven steps in evaluating an ECG?
1. Rate
2. Rhythm
3. Blocks
4. Axis
5. Hypertrophy
6. Myocardial damage
7. Special issues
2|Page
, Heart Blocks
• What are common heart blocks?
– Blockage of electrical conduction which prevents the
passage of electrical stimuli
• Sinus: occur in SA node
• AV: occur in AV node
• Bundle branch: occur in the bundle of His into
Bundle Branches
• Hemiblock: occur in the anterior or posterior
division of the left bundle branch
3|Page
, Sinus Blocks
• What happens with a sinus node block?
– SA nodes stops pacing for at least one cycle
– After the pause, heart resumes pacing at same rate
– An escape beat from an ectopic foci may occur
P waves with blocked
QRS’s
Contributed by
www.cardiologyreviewonline.com
4|Page
