Freebase(0.00 / 0 votes)Rate this definition: Sponson. Sponsons are projections from the sides of a watercraft, for protection, stability, or the mounting of equipment such as armaments or lifeboats, etc. They extend a hull dimension at or below the waterline and serve to increase flotation or add lift when underway.
ECG (electrocardiogram) and high blood pressure. 1  An electrocardiogram (ECG) is a test which measures the electrical activity of your heart to show whether or not it is working normally. 2  An ECG records the heartâs rhythm and activity on a moving strip of paper or a line on a screen.
I. Cardiac cycle. A. Consists of one beat, or one P-QRS-T sequence. 1. The sequence: Atrial contraction (systole) and relaxation (diastole), followed by ventricular contraction and relaxation. 2. The cardiac cycle is measured on ECG from one R wave to the next R wave. 3. Between cycles the ECG recorder returns to baseline or isoelectric line  the flat line between the T wave and the next P wave.