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Because of the negative inotropic effects, the nondihydropyridine calcium channel blockers should be avoided (or used with caution) in individuals with cardiomyopathy. [35] Unlike beta blockers, calcium channel blockers do not decrease the responsiveness of the heart to input from the sympathetic nervous system.
Amlodipine is a long-acting calcium channel antagonist that selectively inhibits calcium ion influx across cell membranes. [42] It targets L-type calcium channels in muscle cells and N-type calcium channels in the central nervous system which are involved in nociceptive signalling and pain perception.
Calcium channel blockers, also known as calcium channel antagonists, are widely used for a number of health conditions. [8] Thus they are commonly present in many people's homes. In young children one pill may cause serious health problems and potentially death. [8]
Calcium channel blockers can be used in the treatment of aortic dissection, particularly if a contraindication to the use of beta-blockers exists. The calcium channel blockers typically used are verapamil and diltiazem, because of their combined vasodilator and negative inotropic effects. [citation needed]
ATC code C08 Calcium channel blockers is a therapeutic subgroup of the Anatomical Therapeutic Chemical Classification System, a system of alphanumeric codes developed by the World Health Organization (WHO) for the classification of drugs and other medical products.
Compared with certain other L-type calcium channel blockers (for example those of the phenylalkylamine class such as verapamil) that have significant action at the heart, the dihydropyridine calcium channel blockers lower blood pressure mainly by relaxing the smooth muscle of the blood vessel walls. [3]
Antihypertensive agents comprise multiple classes of compounds that are intended to manage hypertension (high blood pressure). Antihypertensive therapy aims to maintain a blood pressure goal of <140/90 mmHg in all patients, as well as to prevent the progression or recurrence of cardiovascular diseases (CVD) in hypertensive patients with established CVD. [2]
Calcium channel blockers - in general have negative bathmotropic effects; Parasympathetic stimulation - decreases excitability only of atrial muscle cells; Hyponatremia - decreases external sodium concentration; Hypokalemia [12] - hyper polarization of the resting membrane potential; Acetylcholine - same as parasympathetic stimulation