Скачать или смотреть ECG electrocardiogram| all waves | electrical activity of Heart

electrocardiograph or ECG is a test used to measure the electrical activity of the heart. The test takes only about a few minutes and is devoid of any pain.

The electrical activity of the heart causes the heart muscles to contract that results in the pumping of the heart. The ECG is in the form of spikes and dips known as waves. The wave pattern helps in assessing the rate and rhythm of our heartbeat.
The human heart produces an electrical impulse by itself. As this electrical impulse passes through our heart, it generates an electrical current that spreads over our body and reaches the skin.
The patient is connected to the Electrocardiograph (ECG) machine with three electrical leads (one each to both wrists and the third to the left ankle of the patient), that is used to monitor the activity of the heart. This is standard ECG testing.
The process of electrocardiograph includes:
Small sticky electrodes are attached to the arms, chest and legs.
These electrodes are connected to the ECG machine through wires that help in detecting the electrical impulses occurring at each heartbeat.
These electrodes usually detect the very minute form of changes in an electrical path on the skin which arises from the heart muscles and the electrophysiologic patterns of the depolarizing during every heartbeat.The P wave is the electrical excitation of the atria, or depolarization, initiating atrial contraction.
The QRS complex is the depolarization of ventricles, initiating ventricular contraction. Marking the beginning of the systole.
T wave means the return of ventricles to the normal state (repolarization). Marking the end of the systole.
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