scholarly journals P037: The impact of fever on corrected QT interval in a general emergency department population

CJEM ◽  
2016 ◽  
Vol 18 (S1) ◽  
pp. S90-S91
Author(s):  
D. Drew ◽  
A. Baranchuk ◽  
R.J. Brison
Keyword(s):  
Emergency Department ◽  
Qt Interval ◽  
Chart Review ◽  
Torsades De Pointes ◽  
Community Acquired Pneumonia ◽  
Qtc Prolongation ◽  
Corrected Qt Interval ◽  
Single Center Study ◽  
Electronic Chart ◽  
The Impact

Introduction: Fever is one of the most common reasons for presentation to the emergency department (ED). Interestingly, a number of small studies suggest that fever may function as a modulator of the QT interval in healthy individuals and an arrhythmogenic trigger in patients with occult congenital QT abnormalities. The objective of this study was to explore whether presence of fever adversely affects the QT interval, and whether medications known to prolong this interval affect any association found. Methods: We performed a retrospective, single center study identifying patients (age > 18 years) presenting to the ED with fever (temperature > 38.0 °C) between January 1st, 2012 and December 31st, 2013 via electronic chart review. The subset for analysis were those who had an ECG both at time of fever and while afebrile (within 30 days of initial ECG). Temperature measurement was within 30 minutes of ECG. Actively paced patients were excluded. Univariate and multiple regression analysis were used to determine risk factors for QT derangement in patients with fever. Results: 2018 febrile visits occurred during the reviewed period, 181 of these patients went on to be included in the study. 54.1% of study subjects were female, and the average age was 68.9 years old. The etiology of fever was predominately infectious (69.6%), with community acquired pneumonia being the most frequent cause (24.3%). We found the median corrected QT interval to be significantly shorter in febrile as compared to afebrile patients [QTc = 388.7ms, (371.5-407.5) vs 406.7, (386.7-434.4); p < 0.001]. This difference was observed in both sexes. Males were found to be more likely to experience medication induced QTc prolongation [OR 5.35, 95% CI = 1.46 - 19.68; P < 0.05]. Two instances of Torsades de pointes were identified in our study, both occurring in males on QT prolonging medications. Conclusion: In an ED patient population, fever generally shortens the QT interval independent of sex. Prolongation of the QT interval during fever should thus increase clinical suspicion of congenital or acquired QT disorders. Additionally, males appear to be more susceptible to medication-induced derangements in the QT interval and may require more vigilant monitoring when treated with multiple QT prolonging medications.

Torsades-de-Pointes associated with Taku-Tsubo cardiomyopathy following greatly reduced oxycodone use in an elderly woman

2018 ◽  
Vol 7 (2) ◽  
pp. 155-159 ◽  
Author(s):  
Harry W. Daniell, MD
Keyword(s):  
Qt Interval ◽  
Elderly Woman ◽  
Torsades De Pointes ◽  
Gene Activity ◽  
Related Gene ◽  
Qtc Prolongation ◽  
Standard Measurement ◽  
Corrected Qt Interval ◽  
Elderly Female

This article reports an elderly female oxycodone consumer who developed Torsades-de-Pointes soon after her opioid-associated rate-corrected QT interval (QTC; a standard measurement on electrocardiograms) prolongation had been augmented by the development of Taku-Tsubo cardiomyopathy (TC), a sequence that followed greatly reduced oxycodone ingestion. Factors that likely contributed to this sequence are discussed, including direct opioid-induced inhibition of human ether-a-go-go-related gene activity and of androgen formation plus QTc prolongation induced by the presence of TC.

The impact of fever on corrected QT interval

2017 ◽  
Vol 50 (5) ◽  
pp. 570-575 ◽  
Author(s):  
Doran Drew ◽  
Adrian Baranchuk ◽  
Wilma Hopman ◽  
Robert J. Brison
Keyword(s):  
Qt Interval ◽  
Corrected Qt Interval ◽  
The Impact

Cardiovascular side effects, QT interval in patients treated with some selected antypsychotics. preliminary results

2011 ◽  
Vol 26 (S2) ◽  
pp. 1295-1295
Author(s):  
P. Wierzbinski ◽  
W. Kryszkowski ◽  
A. Florkowski ◽  
P. Galecki
Keyword(s):  
Side Effects ◽  
Ventricular Fibrillation ◽  
Qt Interval ◽  
Ventricular Arrhythmias ◽  
Potassium Level ◽  
First Generation ◽  
Torsades De Pointes ◽  
Qtc Prolongation ◽  
Cardiovascular Side Effects ◽  
Adult Psychiatry

IntroductionTreatment with antypsychotics is associated with cardiovascular side effects. This results from mechanism of action of antypsychotics. Arrhythmias are the serious side effects. Treatment with antipsychotics may prolong QTc and increase the risk of dangerous supraventricular and ventricular arrhythmias.ObjectivesThe main aims of the research are the following: If Any antypsychotics agents may prolong QT interval? If monotherapy with olanzapine, zyprasidone, arypiprazole and politherapy with perphenazine and olanzapine may induce any arrhythmias?MethodsData for this study were collected from 65 patients hospitalized in the Department of Adult Psychiatry and treated with olanzapine and perphenazine (n = 10) and with olanzapine (n = 20), aripiprazole (n = 20), ziprasidone (n = 15). All patients had 12 leads ECG two times: before admitting the drugs and during the treatment. All ECG were assessed on the presence of any abnormalities and QTc was calculated manually by using Bazzet formula.ResultsAmong treated patients no QTc prolongation was observed. There was no prolonged QTc over 450 ms in Male and 470 ms in female patients treated with antypsychotics in mono and politherapy. Potassium level in all patients was within the norm. Bradykardia (< 50/min) and tachykardia (>100/min) was not observed among participants.ConclusionsAtypical antypsychotics such as olanzapine, arypiprazole, zyiprasidon are cardiovascular safe drugs. They did not induce dangerous for life arrhythmias especially ventricular arrhythmia (known as torsades de pointes), which can progress to ventricular fibrillation and sudden death. Politherapy with olanzapine and first generation agents perphenazine is a safe combination and did not induce any cardiovascular side effects.

Corrected QT Interval Is Related to Markers of Hemolysis and Tricuspid Regurgitant Jet Velocity in a Young Cohort with Sickle Cell Disease.

Blood ◽  
2007 ◽  
Vol 110 (11) ◽  
pp. 2258-2258
Author(s):  
Robert I. Liem ◽  
Luciana T. Young ◽  
Alexis A. Thompson
Keyword(s):  
Sickle Cell Disease ◽  
Sickle Cell ◽  
Qt Interval ◽  
Acute Chest Syndrome ◽  
Cell Disease ◽  
Qtc Prolongation ◽  
Corrected Qt Interval ◽  
Conduction Abnormalities ◽  
History Of ◽  
Tricuspid Regurgitant Jet Velocity

Abstract Recent evidence suggests that prolongation in QT interval may be a frequent finding in patients with sickle cell disease (SCD). Few studies, however, have examined the relationship between conduction abnormalities and other cardiac complications, such as left ventricular hypertrophy (LVH) and tricuspid regurgitant jet velocity (TRJV) elevation, in this population. Moreover, long QT may be a marker of increased mortality in conditions, other than SCD, associated with LVH. We therefore sought to evaluate QT interval and its relationship to echocardiographic findings, laboratory parameters and disease severity in a cohort of children and young adults with SCD. Methods We prospectively evaluated the corrected QT interval (QTc) on standard 12-lead ECG in a cross-sectional, convenience sample of 73 subjects (41 males, mean age 14.2±3 years, range 10 to 24) with Hb SS, SC and S-β0 thalassemia undergoing screening for TRJV elevation. Subjects on chronic transfusions were excluded and all studies were performed at baseline on the same day. A review of available medical records was also performed. Results In our cohort, QTc (mean 436±24 ms, range 387 to 531) was prolonged &gt; 440 ms in 30/73 (41%) of subjects at steady state. We also found TRJV elevation ≥ 2.5 m/s in 24/73 (33%) and LVH by ECG or echocardiographic criteria in 32/73 (44%) subjects. Using Pearson’s correlation coefficient, we observed significant correlations between QTc and TRJV (r=0.38, p=0.002), WBC (r=0.37, p=0.001) and several markers of hemolysis, including LDH (r=0.46, p=0001), Hb (r=-0.32, p=0.005), retic (r=0.29, p=0.013), plasma Hb (r=0.27, p=0.03) and AST (r=0.38, p=0.001). Using Student’s t-test for independent samples, only TRJV (2.55±0.33 vs. 2.34±0.26 m/s, p=0.006), LDH (450±166 vs. 329±143 U/L, p=0.001), WBC (10.6±4.7 vs. 8.6±3.3×109/L, p=0.048), retic (14.4±9.2 vs. 10.6±6.1%, p=0.039) and AST (50±22 vs. 38±15 U/L, p=0.009) were significantly higher and Hb (9.1±1.3 vs. 9.9±1.7 g/dL, p=0.04) lower in subjects with QTc &gt; 440 ms compared to those with QTc ≤ 440 ms. We found no significant relationship between QTc and age, LV mass, platelet count or fetal Hb. By χ2 analysis, a larger proportion of subjects with QTc &gt; 440 ms also had a history of acute chest syndrome (p=0.007), gallstones (p=0.047), exchange transfusion (p=0.04) and to a less significant degree, TRJV elevation (p=0.112). Prolonged QTc was not affected by sex, hydroxyurea use or a history of LVH, frequent pain, asthma, splenectomy, priapism and tonsilloadenoidectomy. Given sample size limitations and data reduction methods, we found by logistic regression analysis that the combination of TRJV and history of acute chest syndrome best predicted QTc prolongation, correctly identifying 80% of cases and resulting in positive and negative predictive values of 76% and 81%, respectively. Conclusions We conclude that QTc prolongation is common in a prospectively screened cohort of young sickle cell patients at baseline and is associated with evidence of hemolysis and to a lesser degree, TRJV elevation. Our results contrast with findings in other conditions that link QTc prolongation primarily to LVH. Future studies will be critical to further define QTc variability, pathophysiologic determinants as well as the clinical consequences of conduction abnormalities, which may or may not relate to TRJV elevation, in the sickle cell population.

Candida endocarditis and the impact of antifungal treatment on the corrected QT interval: a case report

2018 ◽  
Vol 34 (8) ◽  
pp. 402-403 ◽  
Author(s):  
Elda Righi ◽  
Daniele Muser ◽  
Alessia Carnelutti ◽  
Federico Pea ◽  
Assunta Sartor ◽  
...  
Keyword(s):  
Case Report ◽  
Qt Interval ◽  
Antifungal Treatment ◽  
Corrected Qt Interval ◽  
The Impact

scholarly journals Artificial Intelligence-Enabled Assessment of the Heart Rate Corrected QT Interval Using a Mobile Electrocardiogram Device

Circulation ◽  
2021 ◽  
Author(s):  
John R. Giudicessi ◽  
Matthew Schram ◽  
J. Martijn Bos ◽  
Connor D. Galloway ◽  
Jacqueline B. Shreibati ◽  
...  
Keyword(s):  
Artificial Intelligence ◽  
Heart Rate ◽  
Qt Interval ◽  
Effective Means ◽  
Area Under The Curve ◽  
Cost Effective ◽  
Qtc Prolongation ◽  
Corrected Qt Interval ◽  
The Difference ◽  
Congenital Lqts

Background: Heart rate-corrected QT interval (QTc) prolongation, whether secondary to drugs, genetics including congenital long QT syndrome (LQTS), and/or systemic diseases including SARS-CoV-2-mediated COVID19, can predispose to ventricular arrhythmias and sudden cardiac death. Currently, QTc assessment and monitoring relies largely on 12-lead electrocardiography. As such, we sought to train and validate an artificial intelligence (AI)-enabled 12-lead electrocardiogram (ECG) algorithm to determine the QTc, and then prospectively test this algorithm on tracings acquired from a mobile ECG (mECG) device in a population enriched for repolarization abnormalities. Methods: Using over 1.6 million 12-lead ECGs from 538,200 patients, a deep neural network (DNN) was derived (n = 250,767 patients for training and n = 107,920 patients for testing) and validated (n = 179,513 patients) to predict the QTc using cardiologist over-read QTc values as the gold standard. The ability of this DNN to detect clinically-relevant QTc prolongation (e.g. QTc ≥ 500 ms) was then tested prospectively on 686 genetic heart disease (GHD) patients (50% with LQTS) with QTc values obtained from both a 12-lead ECG and a prototype mECG device equivalent to the commercially-available AliveCor KardiaMobile 6L. Results: In the validation sample, strong agreement was observed between human over-read and DNN-predicted QTc values (-1.76 ± 23.14 ms). Similarly, within the prospective, GHD-enriched dataset, the difference between DNN-predicted QTc values derived from mECG tracings and those annotated from 12-lead ECGs by a QT expert (-0.45 ± 24.73 ms) and a commercial core ECG laboratory [+10.52 ms ± 25.64 ms] was nominal. When applied to mECG tracings, the DNN's ability to detect a QTc value ≥ 500 ms yielded an area under the curve, sensitivity, and specificity of 0.97, 80.0%, and 94.4%, respectively. Conclusions: Using smartphone-enabled electrodes, an AI-DNN can predict accurately the QTc of a standard 12-lead ECG. QTc estimation from an AI-enabled mECG device may provide a cost-effective means of screening for both acquired and congenital LQTS in a variety of clinical settings where standard 12-lead electrocardiography is not accessible or cost-effective.

The impact of first Timing of antibiotics for community acquired pneumonia in emergency department

2020 ◽  
Keyword(s):  
Emergency Department ◽  
Antibiotic Treatment ◽  
Relevant Literature ◽  
Severity Of Illness ◽  
Clinical Situation ◽  
Community Acquired Pneumonia ◽  
Antibiotic Administration ◽  
Eligibility Criteria ◽  
Antibiotic Overuse ◽  
The Impact

Background and objective: For patients with community-acquired pneumonia (CAP), reported associations between timing of the first dose of antibiotics and short-term mortality are inconsistent. To reduce the risks of antibiotic overuse in the emergency department, this summary of the relevant literature identified patients with CAP who benefit most from early antibiotic administration. Methods: A PubMed and Google Scholar search was performed for articles concerning the epidemiology, prognosis, diagnosis, and preliminary management of CAP. Results: Duplicate studies were eliminated and 370 citations were screened. Finally, 16 studies met the eligibility criteria. The review found that, in the presence of sepsis, antibiotics should not be delayed but administered as soon as possible. For patients with moderate-to-severe symptoms, antibiotics should be administered if a diagnosis of CAP is highly likely. For stable, non-critically ill patients with CAP, the timing of antibiotics remains unclear, but available evidence does not indicate strict requirements. For best quality of care, antibiotic timing whether rapid or delayed depends on the clinical situation. Conclusions: In suspected cases of pneumonia presenting in the emergency department, starting antibiotics early solely to conform to dogmatic guidelines within a rigid timeframe has led to unnecessary antibiotic treatment of uninfected patients, while the outcomes of patients with pneumonia have not improved. Since severity of illness is the key factor associated with poor outcomes in pneumonia, the timing of initial antibiotic treatment should be guided by the severity of symptoms.

QTc Prolongation and Torsades de Pointes

2020 ◽  
pp. 137-142
Author(s):  
Ankur Srivastava ◽  
James E. Littlejohn
Keyword(s):  
Qt Interval ◽  
Torsades De Pointes ◽  
Hemodynamic Instability ◽  
Polymorphic Ventricular Tachycardia ◽  
Stable Patient ◽  
Qtc Prolongation ◽  
Preventative Measures ◽  
Drug Classes ◽  
Alternative Medications ◽  
Primary Management

This chapter looks at QTc prolongation and torsades de pointes (Tdp). In cases of recurrent polymorphic ventricular tachycardia, Tdp should be an immediate consideration. Tdp appears like a “twisting of points” of the cardiac axis, which is most often due to acquired QTc prolongation. The QT interval is inversely related to heart rate; therefore, it is corrected (QTc) using formulas such as Bazett's, Fridericia, and Framingham. There are several congenital and acquired causes of QTc prolongation. The congenital long QT syndrome, Romano-Ward syndrome, and Jervell and Lange-Nielsen syndrome are commonly associated with QTc prolongation and Tdp. Drug classes such as anti-arrhythmics, antidepressants, antipsychotics, antibiotics, and antihistamines are the other common cause of acquired QTc prolongation. Primary management of QTc prolongation and Tdp consists of minimizing risk factors like alternative medications and correcting electrolyte abnormalities. In a hemodynamically stable patient with QTc prolongation, treatment should focus on discontinuing the possible offending medications and correcting electrolyte levels. Meanwhile, patients with Tdp and hemodynamic instability require emergent electrical cardioversion in conjunction with preventative measures.

Sign in / Sign up

Export Citation Format

Share Document