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The larger QRS complex of ventricular depolarization (up to 10 milliseconds), consisting of one or more of the following:

-the Qwave, a downward deflection from septal depolarization -the R wave, an upward deflection from ventricular depolarization -the S wave, a downward deflection following an R wave

A T wave of ventricular repolarization, or recovery (duration relates to QRS).

The electrical impulse slightly precedes the myocardial contraction that it stimulates. The relation of electrocardiographic waves to the cardiac cycle is shown below.

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Coping with Asthma

Coping with Asthma

If you suffer with asthma, you will no doubt be familiar with the uncomfortable sensations as your bronchial tubes begin to narrow and your muscles around them start to tighten. A sticky mucus known as phlegm begins to produce and increase within your bronchial tubes and you begin to wheeze, cough and struggle to breathe.

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