ECG #19

Describe and interpret this ECG.

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Rate:

Atrial = 73 min^-1

Ventricular = 73 min^-1

Rhythm:

Sinus

P waves:  

Duration = 80 ms

Amplitude = 1 mV

PR interval:

Duration =  70 ms

Morphology = Normal

QRS complex:

Duration = 156 ms

Axis = -43°

Q Waves:

Nil

R wave progression:

Normal

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

Yes

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

No

ST segments:

Duration = 120 ms

Morphology = elevation III, V1-3; sagging depression I, aVL, V4-6

T waves:

Duration = 180 ms

Morphology = inversion I, aVL, V4-6

QT interval:

QT duration = 460 ms

QTc duration = 506 ms

Additional comments:

Nil

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Interpretation: This 12-lead electrocardiogram demonstrates a short PR interval with a LBBB pattern due to Wolff-Parkinson-White pre-excitation syndrome type B (indicates a right sided accessory pathway). The voltage criteria for LVH are part of the WPW disease and NOT reflective of LVH.

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