Search results
Results From The WOW.Com Content Network
Long QT syndrome is estimated to affect 1 in 7,000 people. [6] Females are affected more often than males. [6] Most people with the condition develop symptoms before they are 40 years old. [6] It is a relatively common cause of sudden death along with Brugada syndrome and arrhythmogenic right ventricular dysplasia. [3]
The cardiac features of JLNS can be diagnosed by measuring the QT interval corrected for heart rate (QTc) on a 12-lead electrocardiogram (ECG). The QTc is less than 450 ms in 95% of normal males, and less than 460 ms in 95% of normal females. In those with Jervell and Lange-Nielsen syndrome the QTc is typically greater than 500 ms. [8]
An "abnormal" QTc in males is a QTc above 450 ms; and, in females, above 470 ms. [ 17 ] If there is not a very high or low heart rate, the upper limits of QT can roughly be estimated by taking QT = QTc at a heart rate of 60 beats per minute (bpm), and subtracting 0.02 s from QT for every 10 bpm increase in heart rate.
The QTc is less than 450 ms in 95% of normal males, and less than 460 ms in 95% of normal females. Romano–Ward syndrome is suggested if the QTc is longer than these cutoffs. However, as 5% of normal people also fall into this category, some suggest cutoffs of 470 and 480 ms for males and females respectively, corresponding with the 99th ...
What sperm can tell us about a man's overall health — and how it affects pregnancy, maternal health and more. (Photo illustration: Yahoo News; photos: Getty Images)
The value for a normal QT interval is similar in males and females from birth up to adolescence. During infancy, a normal QTc is defined as 400 ± 20 milliseconds. Before puberty, the 99th percentile of QTc values is 460 milliseconds. After puberty, this value increases to 470 milliseconds in males and 480 milliseconds in females. [citation needed]
Symptoms include poor feeding, vomiting, dehydration, acidosis, low muscle tone , seizures, and lethargy. The effects of propionic acidemia quickly become life-threatening. [citation needed] Long-term complications can include intellectual disability, autism, [8] chronic kidney disease, [9] cardiomyopathy, and prolonged QTc interval. [10]
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!