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The heart remains physically quiet during repolarization, a strictly electrical phenomenon.

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The electrode pairs are different for each lead, so the tracing changes slightly in each lead as we change the angle from which we monitor cardiac activity.

The SA node begins the electrical impulse which spreads in wave fashion, stimulating both atria.

Each vertical space represents a voltage change of 0.1 (one-tenth) mv; the voltage between two of the heavy horizontal lines is 0.5 (one-half) mv.

Each small square represents 0.04 (four-hundredths) of a second: the time interval between the heavy lines is 0.2 (two-tenths) seconds in duration.

The electrocardiogram is inscribed on a paper strip ruled in one-mm squares.

The electrocardiograph plots millivolts ( ↕ vertical axis ) over seconds ( ↔ horizontal axis ).Every web hosting plan comes with our in-house built Hepsia hosting Control Panel tool, which will astonish you with its user-friendliness, and our PHP script installation tool offering a 1-click installation of 50 scripts.The Memcached memory caching system and the Varnish Cache web application accelerator are offered too.The web hosting service and the customer service we offer are fantastic.The plans feature a plethora of extras and the prices are very low.Upward spikes are called “positive” deflections; downward spikes are called “negative” deflections.

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