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All ECG 99

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Source: Learn the Heart

The rhythm is sinus tachycardia at about 140 beats per minute and the P waves are quite tall and peaked in II-III-AVF, consistent with right atrial abnormality. The frontal plane QRS axis is +90° (rightward). These changes are consistent with pulmonary disease, and the unstable baseline probably represents increased respiratory effort.

Related: Sinus Tachycardia ECG ReviewRight Atrial Enlargement (RAE) ECG Review