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Class III agents affect potassium (K +) efflux. Class IV agents affect calcium channels and the AV node. Class V agents work by other or unknown mechanisms. With regard to management of atrial fibrillation, classes I and III are used in rhythm control as medical cardioversion agents, while classes II and IV are used as rate-control agents.
Amlodipine's safety in pregnancy has not been established, although reproductive toxicity at high doses is known. Whether amlodipine enters the milk of breastfeeding mothers is also unknown. [7] [6] Those who have heart failure, or recently had a heart attack, should take amlodipine with caution. [29]
Science & Tech. Sports. Weather. 24/7 Help. ... Some drugs and medications affect heart rate, meaning you may have a lower maximum heart rate and target zone, says Dr. Steinbaum. “If you have a ...
Slowing down the conduction of electrical activity within the heart, by blocking the calcium channel during the plateau phase of the action potential of the heart (see: cardiac action potential), results in a negative chronotropic effect, or a lowering of heart rate. This can increase the potential for heart block.
Most people who have taken too much of a calcium channel blocker, especially diltiazem, get slow heart rate and low blood pressure (vasodilatory shock). [1] This can progress to the heart stopping altogether. [2] CCBs of the dihydropyridine group, as well as flunarizine, predominantly cause reflex tachycardia as a reaction to the low blood ...
Age can affect the choice of medications. Current UK guidelines suggest starting patients over the age of 55 years first on calcium channel blockers or thiazide diuretics. Age and multi-morbidity can affect the choice of medication, the target blood pressure and even whether to treat or not. [61] Anxiety may be improved with the use of beta ...
Grade 1 hypertension. The Antihypertensive and Lipid Lowering Treatment to Prevent Heart Attack Trial, also known as ALLHAT, was a randomized, double-blind, active-controlled study comparing at the same time, four different classes of antihypertensive drugs with the rate of coronary heart disease (CHD) events in ‘high-risk’ people with hypertension. [1]
Chronotropic effects (from chrono-, meaning time, and tropos, "a turn") are those that change the heart rate.. Chronotropic drugs may change the heart rate and rhythm by affecting the electrical conduction system of the heart and the nerves that influence it, such as by changing the rhythm produced by the sinoatrial node.