[expand title=”Interpretation”]
Rate:
Atrial = 75 – 115 min-1
Ventricular = 75 – 115 min-1
Rhythm:
Sinus arrhythmia
P waves:
Duration = 90 ms
Amplitude = 0.05 – 0.2 mV
PR interval:
Duration = 120 ms
Morphology = normal
QRS complex:
Duration = 94 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:
Duration = 80 ms
Morphology = normal
T waves:
Duration = 120 ms
Morphology = normal
QT interval:
QT duration = 340 ms
QTc duration = 427 ms
Additional comments:
Nil
Interpretation: There is marked sinus arrhythmia. This can be a normal variant, or a marker of significant obstructive airways disease (there are no right-sided changes to suggest chronic airways disease). In the elderly patient, this could herald the onset of sinus node disease. No clinical details were given with the patient.
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