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Class Ib drugs shorten the action potential of myocardial cell and has a weak effect on the initiation of phase 0 of depolarization Treat and prevent ventricular arrhythmia during and immediately after myocardial infarction , though this is now discouraged given the increased risk of asystole
Several groups of drugs slow conduction through the heart, without actually preventing an arrhythmia. These drugs can be used to "rate control" a fast rhythm and make it physically tolerable for the patient. [citation needed] Some arrhythmias promote blood clotting within the heart and increase the risk of embolus and stroke.
Two distinct drug classes in which cardiotoxicity can occur are in anti-cancer and antiarrhythmic drugs. Anti-cancer drug classes that cause cardiotoxicity include anthracyclines, monoclonal antibodies, and antimetabolites. This form generally manifests as a progressive form of heart failure, but can also manifest as an harmful arrhythmia. [2]
Proarrhythmia is a new or more frequent occurrence of pre-existing arrhythmias, paradoxically precipitated by antiarrhythmic therapy, which means it is a side effect associated with the administration of some existing antiarrhythmic drugs, as well as drugs for other indications. In other words, it is a tendency of antiarrhythmic drugs to ...
Procainamide (PCA) is a medication of the antiarrhythmic class used for the treatment of cardiac arrhythmias. It is a sodium channel blocker of cardiomyocytes; thus it is classified by the Vaughan Williams classification system as class Ia. In addition to blocking the I Na current, it inhibits the I Kr rectifier K+ current. [1]
Cardiotoxicity may be caused by chemotherapy (a usual example is the class of anthracyclines) [3] [4] treatment and/or radiotherapy; [5] complications from anorexia nervosa; adverse effects of heavy metals intake; [6] the long-term abuse of or ingestion at high doses of certain strong stimulants such as cocaine; [7] or an incorrectly ...
Most patients with drug-induced QT prolongation are asymptomatic and are diagnosed solely by EKG in association with a history of using medications known to cause QT prolongation. [6] A minority of patients are symptomatic and typically present with one or more signs of arrhythmia, such as lightheadedness, syncope, or palpitations. [6]
[1] [5] People with TIC may have symptoms associated with heart failure (e.g. shortness of breath or ankle swelling) and/or symptoms related to the tachycardia or arrhythmia (e.g. palpitations). [1] [2] Though atrial fibrillation is the most common cause of TIC, several tachycardias and arrhythmias have been associated with the disease. [5] [1]
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