Left ventricular hypertrophy

The electrocardiogram demonstrates a number of features of LVH. The QRS complex is slightly widened (about 0.11 seconds), the frontal plane axis is leftward, tall R waves are present in multiple leads, and ST-T changes (formerly called a "strain" pattern) are present. The somewhat prominent P waves also raise consideration of left atrial abnormality. Slow R wave progression (V1-V3) is nonspecific and may be seen with LVH, or with multiple other factors. Underlying anteroseptal MI is not excluded.

Normal electrocardiogram showing normal sinus rhythm at a rate of 75 beats/minute, a PR interval of 0.14 seconds, a QRS interval of 0.10 seconds, and a QRS axis of approximately 75°.