TABLE 7-1 ■ Variations and Abnormalities of the Ventricular Impulses
When a ventricle works under conditions of chronic pressure overload or increased afterload, its walls gradually thicken or hypertrophy. Volume overload (increased preload), in contrast, produces dilatation of the ventricle as well as thickening of its walls. A hyperkinetic impulse results from increased stroke volume and does not necessarily signify heart disease. An impulse may feel hyperkinetic when the chest wall is unusually thin.
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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.