agents that inhibit the entry of calcium ions into heart muscle cells, causing a slowing of the heart rate, a lessening of the demand for oxygen and nutrients, and a relaxing of the smooth muscle cells of the blood vessels to cause dilation; used to prevent or treat angina pectoris, some arrhythmias, and hypertension
▫Education the client to avoid grapefruit juice
▫Educate client to take pulse and feel if it is irregular
▫Constipation can occur with verapamil
blocks the entry of calcium into the muscle cells of the heart and the arteries.
It is the entry of calcium into these cells that causes the heart to contract and arteries to narrow. By blocking the entry of calcium, calcium channel blocker (CCBs) decrease the contraction of the heart and dilate the arteries. By dilating the arteries, CCBs reduce the pressure in the arteries. This makes it easier for the heart to pump blood, and, as a result, the heart needs less oxygen.
By reducing the heart's need for oxygen, CCBs prevent or relieve angina. CCBs also are used for treating HTN. CCBs also slow the rate at which the heart beats and are therefore used for treating certain abnormal heart rhythms such as atrial fibrillation.