Ophthalmologists can play a pivotal role in detection and treatment of life-threatening disorders by recognizing syndromes associated with retinal tumors. Ophthalmologists can play a pivotal role in detection and treatment of life-threatening disorders by recognizing syndromes associated with retinal tumors.
The P wave in the ECG represents atrial depolarization, which results in atrial contraction.
P wave-the arch preceding the QRS complex. Q wave-the first negative (downward) deflection of the complex. In some leads, it will not be present. In some cases, the complex begins with an R wave.R wave-the first positive (upward) deflection of the QRS complex.RS-the complex represents the depolarization of the ventricles. This is followed by an isoelectric segment. T wave-this represents ventricular repolarization. Atrial Contraction-the atria mechanically contract starting at the beginning of the P wave, until the beginning of the QRS complex.