Question:medium
Identify the condition shown in the ECG.
Identify the condition shown in the ECG.
Show Hint
Regular sawtooth F-wave baseline with a regular ventricular rate.
Updated On: Jun 23, 2026
- Atrial fibrillation
- Arrhythmia
- Atrial flutter
- Cardiomyopathy
Show Solution
The Correct Option is C
Solution and Explanation
Step 1: A regular, fast atrial tracing with a continuous undulating baseline resembling the teeth of a saw points to atrial flutter.
Step 2: The atria fire around 250-350 beats per minute through a macro-reentrant circuit, usually around the tricuspid annulus, producing the F waves; the AV node blocks a fixed ratio of beats so the ventricular rhythm stays regular. Typical (type I) and atypical (type II) forms exist.
Step 3: This separates it from the options offered. Atrial fibrillation has no discrete waves and an irregular ventricular response; arrhythmia is merely a generic label; cardiomyopathy is a myocardial disease without a defining strip. The sawtooth flutter waves seal the diagnosis.
\[\boxed{\text{Atrial flutter}}\]
Step 2: The atria fire around 250-350 beats per minute through a macro-reentrant circuit, usually around the tricuspid annulus, producing the F waves; the AV node blocks a fixed ratio of beats so the ventricular rhythm stays regular. Typical (type I) and atypical (type II) forms exist.
Step 3: This separates it from the options offered. Atrial fibrillation has no discrete waves and an irregular ventricular response; arrhythmia is merely a generic label; cardiomyopathy is a myocardial disease without a defining strip. The sawtooth flutter waves seal the diagnosis.
\[\boxed{\text{Atrial flutter}}\]
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