There was no correlation between the dose of methadone (range 55 mg to 145 mg) and the QTc interval (p > .05).The QT interval in pregnant women on methadone was below the upper limit of normal, except for those with a cocaine-positive utox. The concomitant used cocaine place pregnant ...
Pregnant women group consisted of 40 women in the second and third trimesters of pregnancy and the non-pregnant control group consisted of healthy women 18-35 years of age. All the patients underwent standard 12-lead electrocardiogram (ECG). The QT interval was measured for each patient at ...
The normal QT interval is controversial, and multiple normal durations have been reported. In general, the normal QT interval is below 400 to 440 milliseconds (ms), or 0.4 to 0.44 seconds. Women have a longer QT interval than men. Lower heart rates also result in a longer QT interval. ...
QT interval varies with the heart rate (HR), thus several normalization formulas have been developed in order to compare QT interval values. Bazett's formula is the most commonly used: [QTc=QT/sqrt(R−R)]. QTc is thecorrected QT interval, but it is only valid within a limited range ...
43 QT interval is said to be prolonged when it is greater than 0.44 s (>0.45 for men and >0.47 for women).11,26 QT interval prolongation is caused by prolonged repolarization of the heart muscle fibers. Delayed repolarization is caused by potassium ion channel alterations and sy...
[47] Bos JM, Crotti L, Rohatgi RK, et al. Mexiletine shortens the QT interval in patients with potassium channel-mediated type 2 long QT syndrome[J]. Circ Arrhythm Electrophysiol, 2019,12(5):e007280. DOI: 10.1161/CIRCEP.118.007280. ...
3、ns of QT Interval and Heart Rate During Exercise in Normal Men and WomenLi Weimin,Song Yingna,Li Yue,et al(First Affiliated Hospital,Harbin Medical University,Harbin,150001)AbstractThe QT interval relation to heart rate and RR interval during exercise was examined by linear regression in 52...
et al. Effects of testosterone on ventricular repolarization in hypogonadic men. Am. J. Cardiol. 103, 887–890 (2009). Article CAS PubMed Google Scholar Schwartz, J. B. et al. Effects of testosterone on the Q-T interval in older men and older women with chronic heart failure. Int ...
The aim of the study was to investigate whether cardiac amyloidosis is associated with QT interval abnormalities and ventricular arrhythmias. A controlled study of 30 patients was undertaken at a university cardiology department in a large referral hospital. Thirty patients (18 men, 12 women, mean ...
Long QT syndrome (LQTS) is a cardiovascular disorder characterized by an abnormality in cardiac repolarization leading to a prolonged QT interval and T-wave irregularities on the surface electrocardiogram. It is commonly associated with syncope, seizures, susceptibility to torsades de pointes, and risk...