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Savaie M, Sheikhi Y, Baghbanian R, Soltani F, Amiri F, Hesam S. Epidemiology, Risk Factors, and Outcome of Cardiac Dysrhythmias in a
Noncardiac Intensive Care Unit. SAGE Open Nurs 2023; 9:23779608231160932. [PMID: 36969363 PMCID: PMC10034271 DOI: 10.1177/23779608231160932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 02/09/2023] [Accepted: 02/13/2023] [Indexed: 03/24/2023] Open
Abstract
Introduction Several extrinsic factors contribute to the development of cardiac
dysrhythmias. In intensive care unit (ICU) settings and among critically ill
patients who are exposed to a large number of risk factors, cardiac
disturbances are more common. Objectives This study aimed to examine the epidemiology, risk factors, and outcome of
cardiac dysrhythmias in a non-cardiac ICU. Methods This is a retrospective, single-center, observational study conducted in a
tertiary noncardiac ICU at Imam Khomeini Hospital in Ahvaz, Iran. Out of the
360 adult patients aged 18 years and older who were admitted to ICU for
longer than 24 h, 340 cases who met the study inclusion criteria were
recruited between March 2018 until October 2018. Results The most common nonsinus dysrhythmias were new-onset atrial fibrillation
(NOAF) (12.9%) and ventricular tachycardia (21 patients—6.2%). According to
our results, previous percutaneous coronary instrumentation, acute kidney
injury, sepsis, and hyperkalemia act as risk factors in the development of
cardiac dysrhythmias. Additionally, we found out that thyroid dysfunction
and pneumonia can predict the development of NOAF in critically ill
patients. The estimated mortality rate among patients with NOAF in this
study was 15.7% (p < .05). Conclusion Cardiac dysrhythmias are common in ICU patients and treating the risk factors
can help to prevent their development and improve patient management and
outcome.
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Affiliation(s)
- Mohsen Savaie
- Pain Research Center, Ahvaz Jundishapur University of Medical
Sciences, Ahvaz, Iran
- Mohsen Savaie, Post code 6155689768, No.
15, East Motahhari Street, Kianpars, Ahvaz, Iran.
| | - Yasaman Sheikhi
- School of Medicine, Ahvaz Jundishapur University of Medical
Sciences, Ahvaz, Iran
| | - Reza Baghbanian
- Pain Research Center, Ahvaz Jundishapur University of Medical
Sciences, Ahvaz, Iran
| | - Farhad Soltani
- Pain Research Center, Ahvaz Jundishapur University of Medical
Sciences, Ahvaz, Iran
| | - Fereshteh Amiri
- Pain Research Center, Ahvaz Jundishapur University of Medical
Sciences, Ahvaz, Iran
| | - Saeed Hesam
- Ahvaz
Jundishapur University of Medical Sciences,
Ahvaz, Iran
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Berger FA, van Weteringen W, van der Sijs H, Hunfeld NGM, Bunge JJH, de Groot NMS, van den Bemt PMLA, van Gelder T. Dynamics of the QTc interval over a 24-h dose interval after start of intravenous ciprofloxacin or low-dose erythromycin administration in ICU patients. Pharmacol Res Perspect 2021; 9:e00865. [PMID: 34697899 PMCID: PMC8546217 DOI: 10.1002/prp2.865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 08/07/2021] [Accepted: 08/10/2021] [Indexed: 11/17/2022] Open
Abstract
QTc interval prolongation is an adverse effect associated with the use of fluoroquinolones and macrolides. Ciprofloxacin and erythromycin are both frequently prescribed QTc-prolonging drugs in critically ill patients. Critically ill patients may be more vulnerable to developing QTc prolongation, as several risk factors can be present at the same time. Therefore, it is important to know the QTc-prolonging potential of these drugs in the intensive care unit (ICU) population. The aim of this study was to assess the dynamics of the QTc interval over a 24-hour dose interval during intravenous ciprofloxacin and low-dose erythromycin treatment. Therefore, an observational study was performed in ICU patients (≥18 years) receiving ciprofloxacin 400 mg t.i.d. or erythromycin 100 mg b.i.d. intravenously. Continuous ECG data were collected from 2 h before to 24 h after the first administration. QT-analyses were performed using high-end holter software. The effect was determined with a two-sample t-test for clustered data on all QTc values. A linear mixed model by maximum likelihood was applied, for which QTc values were assessed for the available time intervals and therapy. No evident effect over time on therapy with ciprofloxacin and erythromycin was observed on QTc time. There was no significant difference (p = 0.22) in QTc values between the ciprofloxacin group (mean 393 ms) and ciprofloxacin control group (mean 386 ms). The erythromycin group (mean 405 ms) and erythromycin control group (mean 404 ms) neither showed a significant difference (p = 0.80). In 0.6% of the registrations (1.138 out of 198.270 samples) the duration of the QTc interval was longer than 500 ms. The index groups showed slightly more recorded QTc intervals over 500 ms. To conclude, this study could not identify differences in the QTc interval between the treatments analyzed.
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Affiliation(s)
- Florine A. Berger
- Department of Hospital PharmacyErasmus MC, University Medical Center RotterdamRotterdamthe Netherlands
| | - Willem van Weteringen
- Department of Paediatric SurgeryErasmus MC Sophia Children’s Hospital, University Medical Center RotterdamRotterdamthe Netherlands
| | - Heleen van der Sijs
- Department of Hospital PharmacyErasmus MC, University Medical Center RotterdamRotterdamthe Netherlands
| | - Nicole G. M. Hunfeld
- Department of Hospital PharmacyErasmus MC, University Medical Center RotterdamRotterdamthe Netherlands
- Department of Intensive CareErasmus MC, University Medical Center RotterdamRotterdamthe Netherlands
| | - Jeroen J. H. Bunge
- Department of Intensive CareErasmus MC, University Medical Center RotterdamRotterdamthe Netherlands
- Department of CardiologyErasmus MC, University Medical Center RotterdamRotterdamthe Netherlands
| | - Natasja M. S. de Groot
- Department of CardiologyErasmus MC, University Medical Center RotterdamRotterdamthe Netherlands
| | - Patricia M. L. A. van den Bemt
- Department of Hospital PharmacyErasmus MC, University Medical Center RotterdamRotterdamthe Netherlands
- Department of Clinical Pharmacy and PharmacologyUniversity Medical Center GroningenGroningenthe Netherlands
| | - Teun van Gelder
- Department of Hospital PharmacyErasmus MC, University Medical Center RotterdamRotterdamthe Netherlands
- Department of Clinical Pharmacy and ToxicologyLeiden University Medical CenterLeidenthe Netherlands
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Kim TY, Choi BJ, Koo Y, Lee S, Yoon D. Development of a Risk Score for QT Prolongation in the Intensive Care Unit Using Time-Series Electrocardiogram Data and Electronic Medical Records. Healthc Inform Res 2021; 27:182-188. [PMID: 34384200 PMCID: PMC8369048 DOI: 10.4258/hir.2021.27.3.182] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Accepted: 12/21/2020] [Indexed: 11/23/2022] Open
Abstract
Objective Drug-induced QT prolongation can lead to life-threatening arrhythmia. In the intensive care unit (ICU), various drugs are administered concurrently, which can increase the risk of QT prolongation. However, no well-validated method to evaluate the risk of QT prolongation in real-world clinical practice has been established. We developed a risk scoring model to continuously evaluate the quantitative risk of QT prolongation in real-world clinical practice in the ICU. Methods Continuous electrocardiogram (ECG) signals measured by patient monitoring devices and Electronic Medical Records data were collected for ICU patients. QT and RR intervals were measured from raw ECG data, and a corrected QT interval (QTc) was calculated by Bazett's formula. A case-crossover study design was adopted. A case was defined as an occurrence of QT prolongation ≥12 hours after any previous QT prolongation. The patients served as their own controls. Conditional logistic regression was conducted to analyze prescription, surgical history, and laboratory test data. Based on the regression analysis, a QTc prolongation risk scoring model was established. RESULTS In total, 811 ICU patients who experienced QT prolongation were included in this study. Prescription information for 13 drugs was included in the risk scoring model. In the validation dataset, the high-risk group showed a higher rate of QT prolongation than the low-and low moderate-risk groups. Conclusions Our proposed model may facilitate risk stratification for QT prolongation during ICU care as well as the selection of appropriate drugs to prevent QT prolongation.
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Affiliation(s)
- Tae Young Kim
- Department of Biomedical Informatics, Ajou University School of Medicine, Suwon, Korea
| | - Byung Jin Choi
- Department of Biomedical Informatics, Ajou University School of Medicine, Suwon, Korea
| | - Yeryung Koo
- Department of Biomedical Informatics, Ajou University School of Medicine, Suwon, Korea
| | - Sukhoon Lee
- Department of Software Convergence Engineering, College of Industry-University Convergence Engineering, Kunsan National University, Gunsan, Korea
| | - Dukyong Yoon
- Department of Biomedical Informatics, Ajou University School of Medicine, Suwon, Korea
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Qi Z, Yang S, Li M, Qu J, Han Q, Zheng J, Wang H. Risk factors and predictors of QTc prolongation in critically ill Chinese patients. Am J Emerg Med 2021; 49:24-28. [PMID: 34051398 DOI: 10.1016/j.ajem.2021.05.040] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 05/10/2021] [Accepted: 05/14/2021] [Indexed: 11/26/2022] Open
Abstract
BACKGROUND To recognize and validate the predictor of risk factors for ICU patients with QTc intervals ≥500 ms. METHODS We retrospectively reviewed 160 ICU patients with their medical electronic records including all demographic data, diagnosis measurements, ECGs and medication from March 1, 2018 to December 1, 2018. All information of patients' baseline, comorbidities, electrolytes and Long QT syndrome (LQTS)-inducing medications of patients with QT interval corrected (QTc) ≥ 500 ms (n = 80) and <500 ms (n = 80) were collected and analyzed using univariate and multivariate analyses to find predictors. RESULTS Comparing to patients with QTc < 500 ms, patients with QTc ≥ 500 ms had increased SOFA (P = 0.010) and APACHE II scores (P = 0.002), longer lengths of ICU stays (P < 0.001), greater incidence of congestive heart failure (P = 0.005) and more preset risk factors (P < 0.001). The frequency of administration of mosapride (P = 0.015), amiodarone (P = 0.027) and number of combined LQTS-inducing medications (P = 0.012) were greater in patients with QTc ≥ 500 ms than in those with QTc < 500 ms. But after multivariate analysis, we found that risk factors related to a QTc ≥ 500 ms were only congestive heart failure (OR: 5.28), number of combined LQTS-inducing medications (OR: 1.60) and APACHE II score (OR: 1.08). CONCLUSIONS For critically ill patients, congestive heart failure, number of combined LQTS-inducing medications and APACHE II score are proved as risk factors associated with QTc > 500 ms.
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Affiliation(s)
- Zhidong Qi
- Department of Critical Care, The 2nd Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Sibo Yang
- Department of Pediatrics, The 1st Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Ming Li
- Department of Critical Care, The 2nd Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Jingdong Qu
- Department of Critical Care, The 2nd Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Qiuyuan Han
- Department of Critical Care, The 2nd Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Junbo Zheng
- Department of Critical Care, The 2nd Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Huaiquan Wang
- Department of Critical Care, The 2nd Affiliated Hospital of Harbin Medical University, Harbin, China.
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Validation of Corrected and Dispersed QT as Predictors of Adverse Outcomes in Acute Cardiotoxicities. Cardiovasc Toxicol 2021; 22:1-13. [PMID: 33400130 DOI: 10.1007/s12012-020-09629-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Accepted: 12/23/2020] [Indexed: 10/22/2022]
Abstract
Acute cardiovascular poisoning is a major cause of adverse outcomes in poisoning emergencies. The prognostic validity of corrected QT (QTc) and dispersed QT (QTd) in these outcomes is still limited. The present study aimed to determine the risk factors of mortality, adverse cardiovascular events (ACVE), and intensive care unit (ICU) admission in patients with acute cardiovascular toxicities and assess the validity of QTc and QTd intervals in predicting these outcomes. This study was conducted on adult patients admitted to Tanta University Poison Control Center with a history of acute cardiotoxic drugs or toxins exposure. The demographic and toxicological data of patients were recorded. Clinical examination, routine laboratory investigations, ECG grading, and measurement of QTc and QTd were performed. The patients were grouped according to their adverse outcomes. Among the included patients, 51 (31.48%) patients died, 61 (37.65%) patients had ACVE, and 68 (41.98%) patients required ICU admission. The most common cause of poisoning is aluminum phosphide, followed by cholinesterase inhibitors. QTd and QTdc showed no significant difference among outcome groups. The best cut-off values of QTc to predict mortality, ACVE, and ICU admission were > 491.1 ms, > 497.9 ms, and ≥ 491.9 ms, respectively. The derived cut-off QTc values were independent predictors for all adverse outcomes after adjusting for poison type, serum HCO3, and pulse. The highest odds ratios for all adverse outcomes were observed in aluminum phosphide poisoning and low HCO3 < 18 mmol/L. Thus, serum HCO3 and QTc interval should be monitored for acute cardiotoxicities, especially in aluminum phosphide and cholinesterase inhibitors poisoning.
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Alahmadi A, Davies A, Vigo M, Jay C. Pseudo-colouring an ECG enables lay people to detect QT-interval prolongation regardless of heart rate. PLoS One 2020; 15:e0237854. [PMID: 32853262 PMCID: PMC7451551 DOI: 10.1371/journal.pone.0237854] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Accepted: 08/04/2020] [Indexed: 01/08/2023] Open
Abstract
Drug-induced long QT syndrome (diLQTS), characterized by a prolongation of the QT-interval on the electrocardiogram (ECG), is a serious adverse drug reaction that can cause the life-threatening arrhythmia Torsade de Points (TdP). Self-monitoring for diLQTS could therefore save lives, but detecting it on the ECG is difficult, particularly at high and low heart rates. In this paper, we evaluate whether using a pseudo-colouring visualisation technique and changing the coordinate system (Cartesian vs. Polar) can support lay people in identifying QT-prolongation at varying heart rates. Four visualisation techniques were evaluated using a counterbalanced repeated measures design including Cartesian no-colouring, Cartesian pseudo-colouring, Polar no-colouring and Polar pseudo-colouring. We used a multi-reader, multi-case (MRMC) receiver operating characteristic (ROC) study design within a psychophysical paradigm, along with eye-tracking technology. Forty-three lay participants read forty ECGs (TdP risk n = 20, no risk n = 20), classifying each QT-interval as normal/abnormal, and rating their confidence on a 6-point scale. The results show that introducing pseudo-colouring to the ECG significantly increased accurate detection of QT-interval prolongation regardless of heart rate, T-wave morphology and coordinate system. Pseudo-colour also helped to reduce reaction times and increased satisfaction when reading the ECGs. Eye movement analysis indicated that pseudo-colour helped to focus visual attention on the areas of the ECG crucial to detecting QT-prolongation. The study indicates that pseudo-colouring enables lay people to visually identify drug-induced QT-prolongation regardless of heart rate, with implications for the more rapid identification and management of diLQTS.
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Affiliation(s)
- Alaa Alahmadi
- Department of Computer Science, The University of Manchester, Manchester, United Kingdom
| | - Alan Davies
- Division of Informatics, Imaging and Data Sciences, School of Health Sciences, The University of Manchester, Manchester, United Kingdom
| | - Markel Vigo
- Department of Computer Science, The University of Manchester, Manchester, United Kingdom
| | - Caroline Jay
- Department of Computer Science, The University of Manchester, Manchester, United Kingdom
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Russell H, Churilov L, Toh L, Eastwood GM, Bellomo R. The incidence, predictors and outcomes of QTc prolongation in critically ill patients. J Crit Care 2019; 54:244-249. [PMID: 31630074 DOI: 10.1016/j.jcrc.2019.09.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Revised: 08/04/2019] [Accepted: 09/11/2019] [Indexed: 11/28/2022]
Abstract
PURPOSE To study the incidence, predictors and outcomes of QTc prolongation (≥500 ms) during ICU admission. METHODS Prospective observational study of patients admitted to a tertiary ICU during a two-month period. We obtained daily data on QTc intervals and arrhythmias from ICU monitors. We performed univariate and multivariable analyses to compare patients who did or did not experience QTc prolongation. RESULTS Of the 257 patients, 93 (36.2%) developed ≥1 episode of QTc ≥500 ms. Such patients had higher APACHE II scores (p < .001), received more QT-prolonging medications (p = .002), and more frequently developed non-sustained (<8 beats, p = .007) and sustained ventricular tachycardia (≥8 beats; p < .001). However, after adjustment for confounders, there was no independent association between QTc duration and odds of ventricular tachyarrhythmia (OR = 0.921 [0.593-1.431], p = .715). Moreover, 98% of ventricular tachyarrhythmias resolved spontaneously. Patients with QTc prolongation had longer ICU (p < .001) and hospital length-of-stay (p = .002), and greater ICU (p = .030) and in-hospital mortality (p = .015). No patient experienced sustained Torsades de Pointes or died from ventricular arrhythmia. CONCLUSIONS A QTc ≥500 ms likely represents a marker of illness severity modulated by several risk factors, and carries no independent association with clinically-significant ventricular tachyarrhythmias. Thus, cessation of QT-prolonging medications to prevent arrhythmias may lack clinical benefit.
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Affiliation(s)
- Hollie Russell
- Department of Intensive Care, Austin Hospital, Heidelberg, Melbourne, Australia; Melbourne Medical School (Austin Clinical School), The University of Melbourne, Victoria, Australia
| | - Leonid Churilov
- Centre for Integrated Critical Care, The University of Melbourne, Victoria, Australia; Melbourne Medical School (Austin Clinical School), The University of Melbourne, Victoria, Australia
| | - Lisa Toh
- Department of Intensive Care, Austin Hospital, Heidelberg, Melbourne, Australia; Faculty of Medicine, Nursing and Health Sciences, Monash University, Victoria, Australia
| | - Glenn M Eastwood
- Department of Intensive Care, Austin Hospital, Heidelberg, Melbourne, Australia
| | - Rinaldo Bellomo
- Department of Intensive Care, Austin Hospital, Heidelberg, Melbourne, Australia; Centre for Integrated Critical Care, The University of Melbourne, Victoria, Australia.
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Cernuda B, Fernandes CT, Allam SM, Orzillo M, Suppa G, Chia Chang Z, Athanasopoulos D, Buraei Z. The molecular determinants of R-roscovitine block of hERG channels. PLoS One 2019; 14:e0217733. [PMID: 31479461 PMCID: PMC6719874 DOI: 10.1371/journal.pone.0217733] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Accepted: 08/17/2019] [Indexed: 02/06/2023] Open
Abstract
Human ether-à-go-go-related gene (Kv11.1, or hERG) is a potassium channel that conducts the delayed rectifier potassium current (IKr) during the repolarization phase of cardiac action potentials. hERG channels have a larger pore than other K+channels and can trap many unintended drugs, often resulting in acquired LQTS (aLQTS). R-roscovitine is a cyclin-dependent kinase (CDK) inhibitor that induces apoptosis in colorectal, breast, prostate, multiple myeloma, other cancer cell lines, and tumor xenografts, in micromolar concentrations. It is well tolerated in phase II clinical trials. R-roscovitine inhibits open hERG channels but does not become trapped in the pore. Two-electrode voltage clamp recordings from Xenopus oocytes expressing wild-type (WT) or hERG pore mutant channels (T623A, S624A, Y652A, F656A) demonstrated that compared to WT hERG, T623A, Y652A, and F656A inhibition by 200 μM R-roscovitine was ~ 48%, 29%, and 73% weaker, respectively. In contrast, S624A hERG was inhibited more potently than WT hERG, with a ~ 34% stronger inhibition. These findings were further supported by the IC50 values, which were increased for T623A, Y652A and F656A (by ~5.5, 2.75, and 42 fold respectively) and reduced 1.3 fold for the S624A mutant. Our data suggest that while T623, Y652, and F656 are critical for R-roscovitine-mediated inhibition, S624 may not be. Docking studies further support our findings. Thus, R-roscovitine’s relatively unique features, coupled with its tolerance in clinical trials, could guide future drug screens.
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Affiliation(s)
- Bryan Cernuda
- Department of Biology, Pace University, New York, NY, United States of America
| | | | - Salma Mohamed Allam
- Department of Biology, Pace University, New York, NY, United States of America
| | - Matthew Orzillo
- Department of Biology, Pace University, New York, NY, United States of America
| | - Gabrielle Suppa
- Department of Biology, Pace University, New York, NY, United States of America
| | - Zuleen Chia Chang
- Department of Biology, Pace University, New York, NY, United States of America
| | | | - Zafir Buraei
- Department of Biology, Pace University, New York, NY, United States of America
- * E-mail:
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Alahmadi A, Davies A, Vigo M, Jay C. Can laypeople identify a drug-induced QT interval prolongation? A psychophysical and eye-tracking experiment examining the ability of nonexperts to interpret an ECG. J Am Med Inform Assoc 2019; 26:404-411. [PMID: 30848818 PMCID: PMC7787352 DOI: 10.1093/jamia/ocy183] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Revised: 11/22/2018] [Accepted: 12/10/2018] [Indexed: 01/10/2023] Open
Abstract
Objective The study sought to quantify a layperson’s ability to detect drug-induced QT interval prolongation on an electrocardiogram (ECG) and determine whether the presentation of the trace affects such detection. Materials and Methods Thirty layperson participants took part in a psychophysical and eye-tracking experiment. Following training, participants completed 21 experimental trials, in which each trial consisted of 2 ECGs (a baseline and a comparison stimulus, both with a heart rate of 60 beats/min). The experiment used a 1 alternative forced-choice paradigm, in which participants indicated whether or not they perceived a difference in the QT interval length between the 2 ECGs. The ECG trace was presented in 3 ways: a single complex with the signals aligned by the R wave, a single complex without alignment, and a 10-second rhythm strip. Performance was analyzed using the psychometric function to estimate the just noticeable difference threshold, along with eye-tracking metrics. Results The just noticeable difference 50% and 75% thresholds were 30 and 88 ms, respectively, showing that the majority of laypeople were able to detect a clinically significant QT-prolongation at a low normal heart rate. Eye movement data indicated that people were more likely to appraise the rhythm strip stimulus systematically and accurately. Conclusions People can quickly be trained to self-monitor, which may help with more rapid identification of drug-induced long QT syndrome and prevent the development of life-threatening complications. The rhythm strip is a better form of presentation than a single complex, as it is less likely to be misinterpreted due to artifacts in the signal.
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Affiliation(s)
- Alaa Alahmadi
- University of Manchester, School of Computer Science, Manchester, UK
| | - Alan Davies
- University of Manchester, School of Computer Science, Manchester, UK
| | - Markel Vigo
- University of Manchester, School of Computer Science, Manchester, UK
| | - Caroline Jay
- University of Manchester, School of Computer Science, Manchester, UK
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Kozik TM, Carey MG, Bhattacharyya M, Chien W, Charos GS, Connolly TF, Hickman MC, Schmidt S, Pelter MM. Cardiovascular responses to ENERGY drinks in a healthy population during eXercise: The C-Energy-X Study. J Electrocardiol 2018; 51:S1-S5. [DOI: 10.1016/j.jelectrocard.2018.07.025] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Revised: 07/19/2018] [Accepted: 07/27/2018] [Indexed: 11/28/2022]
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Fernandes FM, Silva EP, Martins RR, Oliveira AG. QTc interval prolongation in critically ill patients: Prevalence, risk factors and associated medications. PLoS One 2018; 13:e0199028. [PMID: 29898002 PMCID: PMC5999273 DOI: 10.1371/journal.pone.0199028] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Accepted: 04/16/2018] [Indexed: 12/28/2022] Open
Abstract
PURPOSE To investigate the prevalence and risk factors of acquired long QT syndrome (LQTS) on admission to a general Intensive Care Unit (ICU), and to assess the risk of LQTS associated with prescribed medications. METHODS Prospective observational, cross-sectional study approved by the Institutional Review Board. Between May 2014 and July 2016, 412 patients >18 years-old consecutively admitted to the ICU of a university hospital were included. LQTS was defined as a QT interval on the admission electrocardiogram corrected using Bazett's formula (QTc) >460 ms for men and >470 ms for women. All medications administered within 24 hours before admission were recorded. Logistic regression was used. RESULTS LQTS prevalence was 27.9%. In LQTS patients, 70.4% had ≥ 1 LQTS-inducing drug prescribed in the 24 hours prior to ICU admission versus 70.4% in non-LQTS patients (p = 0.99). Bradycardia and Charlson morbidity index score are independent risk factors for LQTS. Haloperidol (OR 4.416), amiodarone (OR 2.509) and furosemide (OR 1.895) were associated with LQTS, as well as another drug not yet described, namely clopidogrel (OR 2.241). CONCLUSIONS The LQTS is highly prevalent in critically ill patients, ICU patients are often admitted with LQTS-inducing medications, and patients with slow heart rate or with high Charlson comorbidity index should be evaluated for LQTS.
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Affiliation(s)
- Flávia Medeiros Fernandes
- Integrated Multiprofessional Health Residency Program—Adult Intensive Care Unit, Pharmacy Department, Health Sciences Centre, Universidade Federal do Rio Grande do Norte, Natal, RN, Brazil
- * E-mail:
| | - Eliane Pereira Silva
- University Hospital Onofre Lopes, Health Sciences Centre, Universidade Federal do Rio Grande Norte, Natal, RN, Brazil
| | - Rand Randall Martins
- Pharmacy Department, Health Sciences Centre, Universidade Federal do Rio Grande do Norte, Natal, RN, Brazil
| | - Antonio Gouveia Oliveira
- Pharmacy Department, Health Sciences Centre, Universidade Federal do Rio Grande do Norte, Natal, RN, Brazil
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Ramalho D, Freitas J. Drug-induced life-threatening arrhythmias and sudden cardiac death: A clinical perspective of long QT, short QT and Brugada syndromes. REVISTA PORTUGUESA DE CARDIOLOGIA (ENGLISH EDITION) 2018. [DOI: 10.1016/j.repce.2017.07.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022] Open
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13
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Ramalho D, Freitas J. Drug-induced life-threatening arrhythmias and sudden cardiac death: A clinical perspective of long QT, short QT and Brugada syndromes. Rev Port Cardiol 2018; 37:435-446. [PMID: 29636202 DOI: 10.1016/j.repc.2017.07.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Accepted: 07/24/2017] [Indexed: 01/03/2023] Open
Abstract
Sudden cardiac death is a major public health challenge, which can be caused by genetic or acquired structural or electrophysiological abnormalities. These abnormalities include hereditary channelopathies: long QT, short QT and Brugada syndromes. These syndromes are a notable concern, particularly in young people, due to their high propensity for severe ventricular arrhythmias and sudden cardiac death. Current evidence suggests the involvement of an increasing number of drugs in acquired forms of long QT and Brugada syndromes. However, drug-induced short QT syndrome is still a rarely reported condition. Therefore, there has been speculation on its clinical significance, since few fatal arrhythmias and sudden cardiac death cases have been described so far. Drug-induced proarrhythmia is a growing challenge for physicians, regulatory agencies and the pharmaceutical industry. Physicians should weigh the risks of potentially fatal outcomes against the therapeutic benefits, when making decisions about drug prescriptions. Growing concerns about its safety and the need for more accurate predictive models for drug-induced fatal outcomes justify further research in these fields. The aim of this article is to comprehensively and critically review the recently published evidence with regard to drug-induced life-threatening arrhythmias and sudden cardiac death. This article will take into account the provision of data to physicians that are useful in the identification of the culprit drugs, and thus, contribute to the prompt recognition and management of these serious clinical conditions.
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Affiliation(s)
- Diogo Ramalho
- Departamento de Medicina, Faculdade de Medicina, Universidade do Porto, Porto, Portugal.
| | - João Freitas
- Serviço de Cardiologia, Centro Hospitalar de São João EPE, Porto, Portugal
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Moreno-Gutiérrez PA, Gaviria-Mendoza A, Cañón MM, Machado-Alba JE. High prevalence of risk factors in elderly patients using drugs associated with acquired torsades de pointes chronically in Colombia. Br J Clin Pharmacol 2016; 82:504-11. [PMID: 27060989 DOI: 10.1111/bcp.12969] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Revised: 03/23/2016] [Accepted: 04/02/2016] [Indexed: 01/08/2023] Open
Abstract
AIMS Medication is one of the main causes of long QT syndrome (LQTS) and torsades de pointes (TdP), and the older adult population is at particularly high risk. The aim of the present study was to describe the prescription patterns of drugs with a risk of TdP in the Colombian older adult population. METHODS Patients older than 65 years who received medication with a risk of TdP during three consecutive months were selected. The medication was obtained and classified according to the QT Drug List from Crediblemeds.org. The data were analysed using SPSS-22. RESULTS A total of 55 932 patients were chronically receiving QT-prolonging drugs; 61.9% (n = 34 ,632) were women and the mean age of the sample was 75.6 years. Drugs with a conditional risk were consumed by 95.2% of patients, 5.3% received drugs with a known risk and 2.9% received drugs with a possible risk. Two or more QT-prolonging drugs were consumed by 10.3% of the patients (n = 5786). Most of the sample (96.8%, n = 54 170) had at least one additional risk factor for LQTS, with a mean of 3.1 ± 0.9 risk factors. Patients receiving QT-prolonging drugs for psychiatric and neurological disease were at a higher risk of major polypharmacy [odds ratio (OR) 3.0; 95% confidence interval (CI) 2.80, 3.22) and of receiving high doses of QT-prolonging drugs (OR 3.8; 95% CI 3.52, 4.05). CONCLUSIONS The widespread use of medication that causes TdP and the high prevalence of additional risks in the older adult population raise the need for accurate prediction of risk and constant patient monitoring. Patients taking psychiatric drugs are at a higher risk of TdP.
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Affiliation(s)
- Paula Andrea Moreno-Gutiérrez
- Grupo de Investigación en Farmacoepidemiología y Farmacovigilancia, Universidad Tecnológica de Pereira - Audifarma S.A., Pereira, Colombia
| | - Andrés Gaviria-Mendoza
- Grupo de Investigación en Farmacoepidemiología y Farmacovigilancia, Universidad Tecnológica de Pereira - Audifarma S.A., Pereira, Colombia
| | - Mauricio Montoya Cañón
- Grupo de Investigación en Farmacoepidemiología y Farmacovigilancia, Universidad Tecnológica de Pereira - Audifarma S.A., Pereira, Colombia
| | - Jorge Enrique Machado-Alba
- Grupo de Investigación en Farmacoepidemiología y Farmacovigilancia, Universidad Tecnológica de Pereira - Audifarma S.A., Pereira, Colombia
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George TK, Chase D, Peter JV, Satyendra S, Kavitha R, George LR, Thomas VV. Association between a prolonged corrected QT interval and outcomes in patients in a medical Intensive Care Unit. Indian J Crit Care Med 2015. [PMID: 26195858 PMCID: PMC4478673 DOI: 10.4103/0972-5229.158271] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
Introduction: Patients admitted into a medical Intensive Care Unit (ICU) have varying illnesses and risk factors. An electrocardiogram (ECG) is a useful tool to assess the cardiac status. The aim of the study was to determine the prevalence of QT prolongation of the ECG in patients admitted to a medical ICU in a tertiary hospital, to assess outcomes in terms of mortality, cardiovascular events, and duration of ICU stay. Materials and Methods: Prospective observational study, 6 months duration, assessing the prevalence of prolonged corrected QT interval (QTc) at admission into a medical ICU. A QTc calculated by Bazett's formula, of >440 ms for males and >460 ms for females was considered prolonged. Details of illness, clinical and lab parameters were monitored. Results: The total number of patients screened was 182. There was a high prevalence of prolonged QTc (30%) on admission to the ICU. This reduced to 19% on day 3 (P = 0.011). In patients with a prolonged QTc the odds ratio of adverse outcome from ICU was 3.17 (confidence interval [CI]: 1.52–6.63) (P = 0.001) and of adverse outcome for hospital stay was 2.27 (CI: 1.11–4.66) (P = 0.014). In the study, 35% of all patients received drugs with QT prolonging action. Of patients with a prolonged QTc at admission 18 (35%) received a QT prolonging drug. Conclusions: We found that prolonged QTc is common (30%) in our medical ICU at admission and a large proportion (35%) received drugs capable of prolonging QT interval. These patients with QTc prolongation have a higher odds ratio for adverse outcomes.
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Affiliation(s)
- Tarun K George
- Department of Medicine, Christian Medical College, Vellore, Tamil Nadu, India
| | - David Chase
- Department of Cardiology Electrophysiology, Christian Medical College, Vellore, Tamil Nadu, India
| | - John Victor Peter
- Department of Critical Care Medicine, Christian Medical College, Vellore, Tamil Nadu, India
| | - Sowmya Satyendra
- Department of Medicine, Christian Medical College, Vellore, Tamil Nadu, India
| | - R Kavitha
- Department of Biostatistics, Christian Medical College, Vellore, Tamil Nadu, India
| | - Leah Raju George
- Department of Anaesthesiology, Christian Medical College, Vellore, Tamil Nadu, India
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Hoogstraaten E, Rijkenberg S, van der Voort PHJ. Corrected QT-interval prolongation and variability in intensive care patients. J Crit Care 2014; 29:835-9. [PMID: 24986247 DOI: 10.1016/j.jcrc.2014.05.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Revised: 04/25/2014] [Accepted: 05/06/2014] [Indexed: 01/08/2023]
Abstract
PURPOSE Critically ill patients are at risk for prolongation of the interval between the Q wave and the T wave in the electrocardiogram (corrected QT [QTc]). Corrected QT prolongation is probably a dynamic process. It is unknown how many patients have a QTc prolongation during their intensive care stay and how variable QTc prolongation is. MATERIALS AND METHODS In a prospective cohort study, continuous 5-minute QTc measurements of 50 consecutive patients were collected. A prolonged QTc interval was more than 500 milliseconds for at least 15 minutes. The QT variance and variability index was used to evaluate QTc variation. RESULTS Fifty-two percent of included patients had a prolonged QTc interval. In a single patient, 0.2% to 91.3% of the QTc intervals over time were prolonged. The use of erythromycin and amiodarone was associated with the mean QTc (P = .02 and P = .006, respectively). The Acute Physiology and Chronic Health Evaluation IV and Sequential Organ Failure Assessment scores were significantly higher in patients with a prolonged QTc interval (30.8 vs 8.6 and 7 vs 5.5, respectively). Eighty-four percent of all patients received at least 1 QTc-prolonging drug. The QT variance and QTc variance were significantly higher in patients with a prolonged QTc (P = .019 and P = .001, respectively). CONCLUSION Continuous QTc monitoring showed a prolonged QTc interval in 52% of intensive care patients. Severity of illness and QT and QTc variances are higher in these patients.
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Affiliation(s)
| | - Saskia Rijkenberg
- Dept of Intensive Care, Onze Lieve Vrouwe Gasthuis, Amsterdam, the Netherlands.
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BEITLAND S, PLATOU ES, SUNDE K. Drug-induced long QT syndrome and fatal arrhythmias in the intensive care unit. Acta Anaesthesiol Scand 2014; 58:266-72. [PMID: 24397608 DOI: 10.1111/aas.12257] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/09/2013] [Indexed: 11/28/2022]
Abstract
Long QT syndrome (LQTS) is a genetic or acquired condition characterised by a prolonged QT interval on the surface electrocardiogram (ECG) and is associated with a high risk of sudden cardiac death because of polymorph ventricular tachyarrhythmia called Torsade de Pointes arrhythmia. Drug-induced LQTS can occur as a side effect of commonly used cardiac and non-cardiac drugs in predisposed patients, often with baseline QT prolongation lengthened by medication and/or electrolyte disturbances. Hospitalised patients often have several risk factors for proarrhythmic response, such as advanced age and structural heart disease. Patients in the intensive care unit (ICU) are particularly prone to develop drug induced LQTS because they receive several different intravenous medications. Additionally, they might have impaired drug elimination because of reduced kidney and/or liver function, and also drug-drug-interactions. The clinical symptoms and signs of LQTS range from asymptomatic patients to sudden death because of malignant arrhythmias, and it is therefore important to recognise the clinical characteristics and typical ECG changes. Treatment of acquired LQTS is mainly awareness, identification and discontinuation of QT prolonging drugs, in addition to eventually supplement of magnesium and potassium. Overdrive cardiac pacing is highly effective in preventing recurrences, and antiarrhythmic drugs should be avoided. Recent data suggest that QT prolongation is quite common in ICU patients and adversely affects patient mortality. Thus, high-risk patients should be sufficiently monitored, and the use of medications known to cause drug-induced LQTS might have to be restricted.
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Affiliation(s)
- S BEITLAND
- Institute of Clinical Medicine; Faculty of Medicine; University of Oslo; Oslo Norway
- Department of Anaesthesiology; Division of Emergencies and Critical Care; Oslo University Hospital; Oslo Norway
| | - E. S. PLATOU
- Department of Cardiology; Division of Medicine; Oslo University Hospital; Oslo Norway
| | - K. SUNDE
- Institute of Clinical Medicine; Faculty of Medicine; University of Oslo; Oslo Norway
- Department of Anaesthesiology; Division of Emergencies and Critical Care; Oslo University Hospital; Oslo Norway
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