identify this rhythm

2nd degree type i heart block
3rd degree heart block
sinus rhythm with 1st degree heart block
sinus arrhythmia
2nd degree type ii heart block

Question

identify this rhythm

2nd degree type i heart block
3rd degree heart block
sinus rhythm with 1st degree heart block
sinus arrhythmia
2nd degree type ii heart block

Accepted Answer

{ "quality": "clear", "question_count": 1, "skills_matched": [ "direct_cot", "multiple_choice_formatter", "explain_then_answer", "quick" ], "needs_drawing": false, "concepts_used": [ "ECG Interpretation", "Heart Block", "Second-Degree Heart Block" ], "new_concepts": [ "Mobitz Type I", "Wenckebach" ], "current_concepts": [ "ECG Interpretation", "Heart Block", "Second-Degree Heart Block", "Mobitz Type I" ] } ## Analyze the PR intervals $$ \begin{aligned} &\text{PR}_1 \approx 0.20\text{ s} \quad (5\text{ small boxes})\ &\text{PR}_2 \approx 0.28\text{ s} \quad (7\text{ small boxes})\ &\text{PR}_3 \approx 0.36\text{ s} \quad (9\text{ small boxes}) \end{aligned} $$ ## Identify the dropped beat $$ \begin{aligned} &\text{P wave present after the 3rd QRS complex with no subsequent QRS conduction.}\ &\text{PR interval progressively prolongs until a QRS complex is dropped (non-conducted P wave).} \end{aligned} $$ ## Determine the rhythm classification $$ \begin{aligned} &\text{Progressive PR prolongation followed by a dropped QRS} \implies \text{Second-Degree AV Block, Mobitz Type I (Wenckebach).} \end{aligned} $$

2nd Degree Type I Heart Block

3rd Degree Heart Block

Sinus Rhythm with 1st degree Heart Block

Sinus Arrhythmia

2nd Degree Type II Heart Block

{ "subject": "Natural Science", "question_type": "Multiple Choice", "knowledge_point": [ "Natural Science", "Medicine", "Cardiology" ] }

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QUESTION IMAGE

Question

Explanation:

Analyze the PR intervals

Identify the dropped beat

Determine the rhythm classification

Answer: