ECG #21

Describe and interpret this ECG.

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Rate:

Atrial = 280 min^-1

Ventricular = 91 min^-1

Rhythm:

Atrial flutter with variable 2:1 and 4:1 block

P waves:  

Duration = 60 ms

Amplitude = 0.1 mV

PR interval:

Duration =  120 ms

Morphology = Normal

QRS complex:

Duration = 76 ms

Axis = 68°

Q Waves:

III

R wave progression:

Normal

LV Hypertrophy [Sokolow; S_V1 + (R_V5 or R_V6) > 35mm) or R_I + S_III > 25mm]?

No

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

No

ST segments:

Duration = 140 ms

Morphology = Normal

T waves:

Duration = 140 ms

Morphology = Normal

QT interval:

QT duration = 388 ms

QTc duration = 477 ms

Additional comments:

Nil

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Interpretation: This ECG shows atrial flutter with variable block. She had been referred in by her GP for management of atrial fibrillation, identified by her cardiologist some 6 weeks previously. She was on no medications.

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