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The QTc interval is longer in females, as well as having a stronger response to IKr-blocking agents. In males, the presence of testosterone upregulates IKr channels and therefore decreases QT interval. [2] Stated otherwise, estrogens prolong the QT interval, while androgens shorten it and decrease the response to IKr-blocking agents. [citation ...
The QT interval is a measurement made on an electrocardiogram used to assess some of the electrical properties of the heart.It is calculated as the time from the start of the Q wave to the end of the T wave, and approximates to the time taken from when the cardiac ventricles start to contract to when they finish relaxing.
The Arizona Center for Education and Research on Therapeutics (AZCERT) maintains the CredibleMeds database. Founded in 2000 at the University of Arizona as part of a network of 14 federally-funded CERTs, [9] AZCERT became a separate non-profit corporation in 2012 funded by the US Food and Drug Administration (FDA), research grants, and charitable contributions.
Cyclobenzaprine, sold under several brand names including, historically, Flexeril, is a muscle relaxer used for muscle spasms from musculoskeletal conditions of sudden onset. [5] It is not useful in cerebral palsy . [ 5 ]
Class III agents have the potential to prolong the QT interval of the EKG, and may be proarrhythmic (more associated with development of polymorphic VT). Class III agents include: bretylium , amiodarone , ibutilide , sotalol , dofetilide , vernakalant , and dronedarone .
Long QT syndrome (LQTS) is a condition affecting repolarization (relaxing) of the heart after a heartbeat, giving rise to an abnormally lengthy QT interval. [7] It results in an increased risk of an irregular heartbeat which can result in fainting, drowning, seizures, or sudden death. [1]
If you have a history of heart problems — such as QT prolongation and heart rhythm disturbance — you should talk to your healthcare provider before taking escitalopram.
Other drugs that prolong the QT interval, such as quinidine, verapamil, amiodarone, sotalol and methadone, may also interact with chlorpromazine to produce additive QT interval prolongation. [ 5 ] Discontinuation