Corrected QT interval (QTc): The QT interval has an inverse relationship with heart rate. The QTc is the QT interval corrected for heart rate, and it estimates the QT interval at a heart rate of 60 beats/min. See formulas. Prolonged QTc is generally defined as >450 ms for adult males ...
interval prolongation. Results: Of 1159 patients enrolled, 259 patients met exclusion criteria, resulting in a final sample size of 900 patients. Patient characteristics: mean (卤 SD) age, 65 卤 15 years; female, 47%; Caucasian, 70%. Admitting diagnoses: heart failure (22%), myocardial infar...
(雌性) Table 4 Parameters associated with linear regression of individual QTc correction formulae versus RR interval (females) 相关参数 截距 斜率 R2 Pearson 相关系数 P值 相关参数 截距 斜率 R2 Pearson 相关系数 P值 QTcF 251.85±6.94 −0.003±0.011 0.001 −0.026 0.755 QTcB 319.23±7.62 −...
On admission the patient’s electrocardiogram (ECG) demonstrated normal sinus rhythm with a prolonged corrected QT interval (QTc) of 638 ms (the upper limit of normal for females is 460 ms).1 Blood tests, including electrolytes, were all within normal limits and there was no postural blood pr...
To evaluate the influence of autonomic function on the QT interval and QT dispersion, 18 patients (10 males and 8 females; mean age 61±9 years) with multiple system atrophy (MSA, Shy-Drager syndrome) were studied. Cardiovascular tests were performed to assess the degree of autonomic dysfunctio...
Drugs may cause MACE by prolonging the QT interval (normal corrected QT [QTc] interval is <430 ms for males and <450 ms for females) • An increased QT interval can lead to cardiac arrhythmias, such as torsades de pointes, which can progress to ventricular fibrillation and sudden death ...
QT(c) interval prolongation was defined as ≥470ms for males and ≥480ms for females. In both males and females, QT(c) interval >500ms was considered abnormally high. A medication was classified as QT interval-prolonging if there were published data indicating that the drug causes QT ...
We analyzed the QTc interval, QRS axes and interventricular septal thickness (IVST) in 41 patients who had a prolonged QT interval on routine electrocardiography (ECG) (5 females and 36 males, mean age 65+/-13 years). The QRS axis of patients in the LQTS group (27+/-49 degrees) was ...
(HealthDay)—For healthy females, oral progesterone administration attenuates drug-induced QT interval lengthening, according to a study published online April 6 in JACC: Clinical Electrophysiology.
QTc intervals of 0.47 second or longer in males and 0.48 second or longer in females were completely predictive but resulted in false negative diagnoses in 40 percent of the males and 20 percent of the females.In families affected by the long-QT syndrome, measurement of the QTc interval may ...