The ECG interpretative statement "Prol onged QT" means different things to different people. It can be taken as a purely descriptive statement referring to the QT interval beyond a certain threshold. Alternatively, it could be taken to refer to a disease state (eg, congenital long QT syndrome...
Some argue that the QT interval should be measured only by cardiologists, but this suggestion is impractical. In light of the number of medications that could prolong the QT interval, other health care practitioners, especially internists, family practitioners, and psychiatrists, should either learn ...
How to measure the QT interval--what is normal? The QT interval extends from the beginning of the QRS complex to the end of the T wave. Since the report of Jervell and Lange-Nielsen in 1957, it has been difficult to determine whether to measure a QT or a QU interval. U waves are ...
In terms of everyday functioning, patients with long QT syndrome should avoid drugs that prolong QT interval and have their electrolyte abnormalities corrected. Participation of long QT syndrome patients in competitive sports is still a matter of debate among the experts. The second part of the ...
Citalopram can prolong the QT interval, but it is generally considered to have a lower risk compared to other medications. 8 Can you switch from Citalopram to Fluoxetine? Switching between SSRIs, including Citalopram and Fluoxetine, should be done under medical supervision to manage dosing and pote...
Evidence regarding which drugs cause torsades is extremely murky. In some cases it seems that drugs have been incorrectly maligned (e.g. azithromycin, olanzapine). Which drugs prolong QT the most? Drugs that cause QTc prolongation A long QT interval is most frequently seen withclass I and class...
Clinical observations: sex differences and sex hormone effects in long-QT syndrome The inherited LQTS is a heterogeneous arrhythmogenic disease, in which an impaired cardiac repolarization predisposes patients to torsade-de-pointes (TdP) tachycardia, syncopes, and sudden cardiac death (SCD) [19]. Dat...
Dr. Grenzer mentions the ‘QT interval’ in relation to the use of both hydroxychloroquine and azithromycin, asboth can prolong the QT interval. What is the QT interval? According toThe QT interval: How long is too long?: The QT interval on the ECG is measured from the beginning of the...
Many antiarrhythmic drugs, psychiatric drugs, anti-infectives, and antihistamines prolong the QT interval and pose a risk of TdeP. Importantly, QT prolongation does not appear to be a class effect; that is, there can be a marked variation in the magnitude of QT effect among drugs with otherwi...
Reliable information on the proper use of QT-prolonging medications is scarce. Although a QT interval of at least 500 milliseconds generally has been shown to correlate with a higher risk of torsades de pointes, there is no established threshold below which prolongation of the QT interval is ...