Describe and interpret this ECG.

ECG #14

Interpretation

Rate:

Atrial = 240 min-1

Ventricular = 80 min-1

Rhythm:

Atrial flutter with variable 3:1 and 4:1 blockade

P waves:  

Duration = 80 ms

PR interval:

Duration = 160 ms

Morphology = normal

QRS complex:

Duration = 112 ms

Axis = 77°

Q Waves:

Nil

R wave progression:

Normal

LV Hypertrophy [Sokolow; SV1 + (RV5 or RV6) > 35mm) or RI + SIII > 25mm]?

No

RV Hypertrophy [R/S ratio V5 or V6 < 1 or R/S ratio V1 > 1 or S1S2S3 pattern]?

No

ST segments:

 

N/A

T waves:

 

N/A

QT interval:

 

N/A

Additional comments:

Nil


Interpretation: There is atrial flutter with variable 3:1 and 4:1 blockade. The atrial rate is slower than anticipated (240 min-1 rather than 300 min-1). This implies that the patient is likely to be on rate control medications (β-blockers, CCBs, Class III anti-arrhythmics).

 

ECG #14
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