We have detected that you are using an Ad Blocker. PracticeUpdate is free to end users but we rely on advertising to fund our site. Please consider supporting PracticeUpdate by whitelisting us in your ad blocker.
We have sent a message to the email address you have provided, . If this email is not correct, please update your settings with your correct address.
The email address you provided during registration, , does not appear to be valid. Please update your settings with a valid address before to continue using PracticeUpdate.
Welcome to PracticeUpdate! We hope you are enjoying access to a selection of our top-read and most recent articles. Please register today for a free account and gain full access to all of our expert-selected content.
You can find your saved items on your dashboard, in the "saved" tab.
You've recommended your first item
Your recommendations help us improve our content suggestions for you and other PracticeUpdate members.
You've subscribed to your first topic alert
What does that mean?
Each day, we'll check to see if new items have been published to the topics you're subscribed to, and we'll send you one email with all of the new items from that day.
We'll keep all topic alert notifications available on your dashboard for 30 days, to make sure you don't miss anything.
Lastly, whenever you have unread items in the topics you've subscribed to, the "Alerts" icon will light up in the main menu. Just click on the bell to see your five most-recent, unread notifications.
There has been considerable interest in the use of hydroxychloroquine and azithromycin (HCQ/AZM) to treat COVID-19. This retrospective study used data from 415 patients hospitalized with COVID-19 and treated with concomitant HCQ/AZM to examine whether this treatment was associated with corrected QT (QTc) prolongation or risk of arrhythmogenesis. The mean baseline QTc was 443 msec, and the maximum was 473 msec. A QTc >500 msec was recorded for 21% of participants. QTc prolongation ≥500 msec was associated with age, heart failure, elevated creatinine, BMI <30 kg/m2, and peak troponin. No associations between QTc change and death were observed.
Hospitalized patients with COVID-19 treated with HCQ/AZM experienced an increase in QTc, but there was no observed associated increase in mortality rate during the relatively short observation period.
This abstract is available on the publisher's site.
Hydroxychloroquine and azithromycin (HCQ/AZM) are being widely used to treat COVID-19 despite the known risk of QT interval prolongation and unknown risk of arrhythmogenesis in this population.
The study aimed to characterize corrected QT (QTc) prolongation in a cohort of hospitalized COVID-19 patients treated with combination HCQ/AZM.
A retrospective cohort of COVID-19 hospitalized patients treated with HCQ/AZM was reviewed. The QTc interval was calculated prior to drug administration and for the first 5 days following initiation. The primary end point was the magnitude of QTc prolongation, and factors associated with QTc prolongation. Secondary endpoints were incidences of sustained ventricular tachycardia or ventricular fibrillation and all-cause mortality.
Among 415 patients receiving concomitant HCQ/AZM, the mean QTc increased from 443±25 msec to a maximum of 473±40 msec (87 (21%) had a QTc ≥500 msec). Factors associated with QTc prolongation ≥500 msec were age (p < 0.001), body mass index <30 kg/m2 (p = 0.005), heart failure (p < 0.001), elevated creatinine (p = 0.005), and peak troponin (p < 0.001). The change in QTc was not associated with death over the short period of the study in a population where mortality was already high (hazard ratio, 0.998, p = 0.607). No primary high-grade ventricular arrhythmias were observed.
An increase in QTc was seen in hospitalized COVID-19 patients treated with HCQ/AZM. Several clinical factors were associated with greater QTc prolongation. Changes in QTc were not associated with increased risk of death.