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El Gameel D, Sharif AF, Shoeib O, Elgebally EI, Fayed MM. Development and validation of a risk prediction nomogram for serious arrhythmias in acute digoxin toxicity among pediatrics: A multicenter study. Toxicon 2023; 233:107241. [PMID: 37558139 DOI: 10.1016/j.toxicon.2023.107241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 07/24/2023] [Accepted: 08/02/2023] [Indexed: 08/11/2023]
Abstract
Digoxin is a cardiac glycoside obtained from the leaves of the foxglove plant, Digitalis lanata. Several studies have described the safety of digoxin including various life-threatening events, notably cardiac arrhythmias. Early identification of high-risk patients and subsequent initiation of the utmost medical care are associated with a better prognosis. The assessment of serum digoxin levels, which is not always convenient, is the only tool used to evaluate the severity of digoxin exposure. However, the feasibility of this tool, particularly in resource-restricted countries, remains unclear. Therefore, the current study aimed to establish and validate a feasible alternative tool, a bedside nomogram, to identify pediatric patients diagnosed with acute digoxin intoxication who are at risk of developing serious arrhythmias. This was a two-phase, multicenter, retrospective study. The prevalence of serious arrhythmias was approximately 17%. Patients diagnosed with serious arrhythmias showed significantly higher serum digoxin, random blood glucose, and potassium levels but lower sodium, magnesium, and hemoglobin levels. Serious arrhythmias were associated with significantly lower P-R intervals, shorter QTc intervals, and more frequent digoxin effects (p < 0.05). The proposed nomogram showed that combining age and initial random blood glucose, sodium, and potassium levels could predict the future incidence of serious arrhythmia with an accuracy of 96.2% (sensitivity = 94.4%, specificity = 96.5%), an area under the curve (AUC) of 0.977, and p < 0.001. Validation of the proposed nomogram yielded an AUC for the nomogram probability of approximately 81%, and the AUC for the predicted probability using the developed model was 98.3%, indicating that both the validated model and the developed nomogram were significant predictors of serious arrhythmia. The utility of using the four-factor nomogram to determine the risk of serious arrhythmia in children exposed to an overdose of digoxin is comparable, if not superior, to the serum digoxin level.
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Affiliation(s)
- Dina El Gameel
- Forensic Medicine and Clinical Toxicology Department, Faculty of Medicine, Tanta University, Tanta, Egypt; Poison Control Center, Aseer, Saudi Arabia
| | - Asmaa Fady Sharif
- Forensic Medicine and Clinical Toxicology Department, Faculty of Medicine, Tanta University, Tanta, Egypt; Clinical Medical Sciences Department, College of Medicine, Dar Al-Uloom University, Riyadh, Saudi Arabia.
| | - Osama Shoeib
- Cardiology Department, Faculty of Medicine, Tanta University, Tanta, Egypt
| | - Elsayed Ibrahim Elgebally
- Department of Pediatrics, Menoufia University, Shebeen Al-kom, Egypt; Paediatric Department, Saudi German Hospital, Aseer, Saudi Arabia
| | - Manar Maher Fayed
- Forensic Medicine and Clinical Toxicology Department, Faculty of Medicine, Tanta University, Tanta, Egypt
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Czaja AS, Anderson HD, Ghosh D, Davidson J, Campbell JD, Valuck RJ. Increased Odds of Ventricular Arrhythmias Associated with Selective Serotonin Reuptake Inhibitor Use among the Pediatric and Young Adult Population: A Case-Control Study. J Pediatr 2020; 226:173-178.e8. [PMID: 32645405 DOI: 10.1016/j.jpeds.2020.07.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 05/31/2020] [Accepted: 07/01/2020] [Indexed: 10/23/2022]
Abstract
OBJECTIVE To measure the association between selective serotonin reuptake inhibitor (SSRI) use and out-of-hospital ventricular arrhythmia among the pediatric and young adult population. STUDY DESIGN Case-control study using US claims data from 2007 to 2018. Cases were subjects with at least 1 event between ages 2 and 24 years. Controls (matched 10:1 on index date, age, sex, and continuous enrollment) had no events during study period. Independent association between current SSRI use (prescription fill with continuous exposure ending on, or after, the index date) and incident out-of-hospital ventricular arrhythmia (hospitalization or emergency room encounter with primary diagnostic code for ventricular arrhythmia) was estimated using multivariable conditional logistic regression. Separate analyses were performed for pediatric (2-17 years of age) vs young adult (18-24 years of age) subjects and between citalopram/escitalopram vs other SSRIs. RESULTS During the study period, 237 eligible cases were identified with 2370 matched controls. Cases were more likely to have government insurance and have a mental health, cardiac, or other complex chronic condition. Thirteen cases (5%) and 15 controls (<1%) had current SSRI exposure. After adjustment for mental health and chronic conditions, there was an increased odds of current SSRI use among cases compared with controls (OR 5.11, 95% CI 1.22-21.37). No difference was observed between pediatric and young adult ages, nor between citalopram/escitalopram and other SSRIs. CONCLUSIONS These findings demonstrate increased odds of out-of-hospital ventricular arrhythmia associated with SSRI use in the pediatric and young adult population, suggesting a need for heightened awareness and ongoing monitoring of this potential adverse effect.
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Affiliation(s)
- Angela S Czaja
- Department of Pediatrics, Critical Care Section, School of Medicine, University of Colorado, Aurora, CO.
| | - Heather D Anderson
- Department of Clinical Pharmacy, Center for Pharmaceutical Outcomes (CePOR), Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado, Aurora, CO
| | - Debashis Ghosh
- Department of Biostatistics & Informatics, Colorado School of Public Health, University of Colorado, Aurora, CO
| | - Jesse Davidson
- Department of Pediatrics, Cardiology Section, School of Medicine, University of Colorado, Aurora, CO
| | - Jonathan D Campbell
- Department of Clinical Pharmacy, Center for Pharmaceutical Outcomes (CePOR), Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado, Aurora, CO
| | - Robert J Valuck
- Department of Clinical Pharmacy, Center for Pharmaceutical Outcomes (CePOR), Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado, Aurora, CO
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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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Malone K, Hancox JC. QT interval prolongation and Torsades de Pointes with donepezil, rivastigmine and galantamine. Ther Adv Drug Saf 2020; 11:2042098620942416. [PMID: 32874532 PMCID: PMC7436781 DOI: 10.1177/2042098620942416] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Accepted: 06/19/2020] [Indexed: 01/08/2023] Open
Abstract
Background Acetylcholinesterase inhibitors (AChEis) including donepezil, galantamine and rivastigmine are used to treat Alzheimer's disease (AD). This study aimed to evaluate evidence from the case report literature for an association between these agents and risk of QT interval prolongation and Torsades de Pointes (TdP) arrhythmia. Methods Published literature was mined with predetermined MeSH terms for each of donepezil, galantamine and rivastigmine, to identify cases of QT interval prolongation and TdP. Case reports were analysed using causality scales and a QT interval nomogram. Results A total of 13 case reports were found (10 for donepezil, 2 for galantamine and 1 for rivastigmine) with rate corrected QT interval (QTc) prolongation. Five cases with donepezil exhibited TdP. TdP was not reported in the cases with galantamine and rivastigmine. The use of a QT heart rate nomogram highlighted risk with donepezil compared with the other two drugs and the application of the Naranjo causality scale suggested probable or possible causation for all donepezil cases. All patients had at least two other risk factors for TdP, including modifiable risk factors such as electrolyte disturbances, bradycardia, co-administration of QT prolonging drugs. A number of recent cases involved recent changes in medication. Conclusion Our evaluation of the case report literature suggests that there is evidence for a causal association between donepezil and QTc/TdP risk. Attention to risk factors for QTc prolongation/TdP should be exercised when prescribing donepezil and modifiable risk factors corrected. Owing to the low number of cases with galantamine and rivastigmine, further work is needed to establish whether these drugs may be more suitable than donepezil for patients with other risk factors for TdP.
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Affiliation(s)
- Katie Malone
- School of Physiology, Pharmacology and Neuroscience, University of Bristol, University Walk, Bristol, UK
| | - Jules C Hancox
- School of Physiology, Pharmacology and Neuroscience, University of Bristol, University Walk, Biomedical Sciences Building, Bristol, BS8 1TD, UK
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Measurement and Management of QT Interval Prolongation for General Physicians. J Gen Intern Med 2020; 35:865-873. [PMID: 31654357 PMCID: PMC7080915 DOI: 10.1007/s11606-019-05477-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Revised: 09/24/2019] [Accepted: 10/02/2019] [Indexed: 02/08/2023]
Abstract
One of the more challenging aspects of ECG interpretation is measurement and interpretation of the QT interval. This interval represents the time taken for the ventricles to completely repolarise after activation. Abnormal prolongation of the QT interval can lead to torsades de pointes, a form of potentially life-threatening polymorphic ventricular tachycardia (VT). Detection of a prolonged QT interval is essential as this can be a reversible problem, particularly in the context of the use of a variety of commonly prescribed medications in the hospital setting. Automated ECG printouts cannot be relied upon to diagnose QT interval prolongation; thus, the onus is on the clinician to identify it. This is a difficult task, as the normal QT interval is typically measured relative to the heart rate. Therefore, the QT interval often requires "correction" for the current heart rate, in order to correctly stratify the risk of torsades de pointes. A wealth of correctional formulae have been derived, but none has proven superior. We present an approach to the ECG in this context, and a step-by-step guide to manually measuring and correcting the QT interval, and an approach to management in common hospital-based clinical scenarios.
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Abstract
Depression risk is 2 to 3 times higher in medically ill youth compared with the general pediatric population. The relationship between medical illness and depression is bidirectional with significant contributions from psychological, developmental, illness-related, familial, and treatment factors. This article discusses the presentation, early identification, evaluation, and management of depression in medically ill youth and identifies specific risk factors and reviewing selected medical illness-specific considerations.
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Affiliation(s)
- Nasuh Malas
- Department of Psychiatry, University of Michigan Medical School, Ann Arbor, MI, USA; Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, MI, USA.
| | - Sigita Plioplys
- Department of Child and Adolescent Psychiatry, Ann and Robert H. Lurie Children's Hospital of Chicago, Feinberg School of Medicine, Northwestern University, 225 East Chicago Avenue Box# 10, Chicago, IL 60611, USA
| | - Maryland Pao
- Intramural Research Program, National Institutes of Health, National Institute of Mental Health, Clinical Research Center, NIH Building 10, CRC East 6-5340, MSC 1276, Bethesda, MD 20892-1276, USA
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Stojanović-Vukadinović S, Stojanović Z, Macanović G, Banjac N, Erić Ž. Analysis of the effect of the antidepressant sertraline on the length of QT interval in patients with depression and alcohol dependence. SANAMED 2019. [DOI: 10.24125/sanamed.v14i1.301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Introduction and Aim: Depression in psychiatry covers a large area of mental pathology and it is one of the most complex problems of modern medicine with broad implications for the health of the individual and the society as a whole. Depression is also a frequent companion of alcohol addiction. The aim of this study was to investigate the effect of the antidepressant drug sertraline on the length of QT interval in depressed patients with alcohol dependence. Patients and methods: This research included male patients (older than 18 years of age) suffering from alcohol addiction, who were also diagnosed with depression, that is, depressive disorder, at the beginning of hospitalisation, on the basis of DSM-IV (Diagnostic and statistical manual of mental disorders) criterion and positive Hamilton Rating Scale for Depression (HRSD). The study included 49 patients treated with antidepressant sertraline for 20 days. In our study, the global QTc interval (12 leads) was determined automatically by applying ECG device of the producer and type "Schiller Cardiovit AT-1", which uses "SCHILLER ECG Measurement and Interpretation Software for Children and Adult ECGs". Measured/empirical values of data were statistically processed in SPSS 16.0 programme package for Windows. Methods of descriptive statistics and methods of statistic testing of hypotheses were used. Results: In our study, in spite of the vulnerability of patients due to the heart damage and the liver dysfunction arising from alcohol consumption, as well as altered patients' drugs metabolism, no elongation of QTc interval resulting from the application of sertraline was established (p = 0.735). The average prolongation of QTc interval of 1.633 ms was observed (95% CI = 8.005 ms, 11.270 ms). Conclusion: Our study does not indicate that the antidepressant drug sertraline has a statistically significant effect on the prolongation of the QT interval of depressed patients with alcohol dependence.
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Abstract
SummaryDepressive disorder in those over the age of 60 has many clinical similarities to depression in younger adults, but biological changes related to ageing may necessitate a different approach to treatment. We present an evidence-based review of treatment for late-life depression, focusing on pharmacological approaches, including monotherapy, combination and augmentation strategies. Selective serotonin reuptake inhibitors such as sertraline and citalopram are well tolerated, have the advantage of a favourable side-effect profile, and are good options for first-line treatment. Second-line treatment options include combination therapy with a second antidepressant, or treatment augmentation with an antipsychotic or lithium. We also consider evidence for nonpharmacological treatment strategies, including psychological therapy and neurostimulation. Finally, we summarise evidence for treatment of depression in patients in dementia.
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Lack of relationship between plasma levels of escitalopram and QTc-interval length. Eur Arch Psychiatry Clin Neurosci 2017; 267:815-822. [PMID: 28116499 DOI: 10.1007/s00406-016-0758-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Accepted: 12/13/2016] [Indexed: 10/20/2022]
Abstract
Despite safety concerns raised by the European Medicines Agency (EMA), evidence supporting QT-lengthening effects of escitalopram is far to be conclusive. We aimed to evaluate the relationship between escitalopram plasma levels (Escit-PL) and corrected QT-interval length (QTc-length) in 91 outpatients recruited from a hospital setting. Fifteen patients had an abnormally prolonged QTc-interval, and 3 had QTc-intervals ≥500 ms. No correlation between Escit-PL and QTc-length was found (r = 0.08; p = 0.45). Linear/logistic regression analyses were also conducted taking into account potential confounders such as age, gender, personal history of heart disease, medication load and concomitant use of antipsychotic/tricyclic antidepressants. Escit-PL did not predict either QTc-length or abnormally prolonged QTc-interval. Only antipsychotics/tricyclics use (adjusted β = 0.26, SE = 9.1; p = 0.01) was an independent predictor of QTc-length (R 2 = 0.096, F = 4.68, df = 2,88; p = 0.01). Only antipsychotics/tricyclics use (OR 3.56 [95% CI 1.01-12.52]; p < 0.05) and medication load (OR 1.32 [95% CI 1.06-1.64]; p < 0.01) were significantly associated with an increased risk of abnormally prolonged QTc-interval (Omnibus test χ 2 = 9.5, df = 2; p < 0.01). Our study did not find a significant relationship between Escit-PL and QTc-length even when recognized modulating factors of the QT-interval were controlled for. Concomitant use of other potentially arrhythmogenic agents may help to explain the apparent link between escitalopram and QT prolongation previously suggested. The advisability of maintaining the EMA warning is once again called into question.
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Pickham D, Hsu D, Soofi M, Goldberg JM, Saini D, Hadley D, Perez M, Froelicher VF. Optimizing QT Interval Measurement for the Preparticipation Screening of Young Athletes. Med Sci Sports Exerc 2017; 48:1745-50. [PMID: 27116644 DOI: 10.1249/mss.0000000000000962] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
PURPOSE Sudden cardiac death is the leading cause of death in athletes. Long QT syndrome (LQTS) is one of the most common cardiogenetic diseases that can lead to sudden cardiac death and is identified by QT interval prolongation on an ECG. Recommendations for QT monitoring in athletes are adopted from nonathlete populations. To improve screening, ECG data of athletes are assessed to determine a more appropriate method for QT interval estimation. METHODS ECG (CardeaScreen) data were collected from June 2010 to March 2015. ECG data with HR greater than 100 bpm were excluded. Fiducial points of outliers were manually corrected if the QRS onset or the T wave offset was misidentified. A model of best fit was determined and compared across four QT correction factors. Classification analysis was used to compare the Bazett's corrected QT interval to the 99th percentile of uncorrected QT interval. RESULTS High school (n = 597), college (n = 1207), and professional athletes (n = 273) (N = 2077) were analyzed. Mean age was 19 ± 3.5 yr. QT interval varied by cohort (HS = 388 ± 30, Col = 410 ± 33, Pro = 407 ± 27, p < 0.0001). A nonlinear power function with a cubic exponent of -0.349 fit the data the best (R = 0.64). Of the four common correction factors, Fridericia had the lowest residual dependence to HR (m = -0.10). With standard screening, 75% of athletes within the top 1% for QT interval were not identified for further investigation for LQTS. CONCLUSION Up to 75% of athletes possessing an uncorrected QT interval greater than 99% of the population are not identified for investigation for LQTS using the recommended criteria. We propose a new method of risk stratification that replaces QT interval correction. Further study is needed to establish QT interval distributions and risk thresholds in athletes.
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Affiliation(s)
- David Pickham
- 1Stanford Cardiovascular Institute, Stanford, CA; 2Division of General Medical Disciplines, Stanford University School of Medicine; Stanford, CA; 3Stanford University School of Medicine; Stanford, CA; 4Ohio State University College of Medicine; Columbus, OH; 5Department of Cardiology, University Of Pennsylvania; Philadelphia, PA; 6Gunn High School, Palo Alto, CA; 7CardeaScreen, Seattle, WA; and 8Division of Cardiovascular Medicine, Stanford University School of Medicine; Stanford, CA
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Bray JJH, Hancox JC. Solifenacin linked QT interval prolongation and torsades de pointes. Ther Adv Drug Saf 2017; 8:245-247. [PMID: 28845232 DOI: 10.1177/2042098617702616] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Accepted: 03/11/2017] [Indexed: 11/16/2022] Open
Affiliation(s)
- Jonathan J H Bray
- School of Physiology, Pharmacology and Neuroscience, Biomedical Sciences Building, University Walk, Bristol, UK
| | - Jules C Hancox
- School of Physiology, Pharmacology and Neuroscience, Biomedical Sciences Building, University Walk, Bristol, BS8 1TD. UK
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Lionte C, Sorodoc V, Jaba E, Botezat A. Development and validation of a risk-prediction nomogram for in-hospital mortality in adults poisoned with drugs and nonpharmaceutical agents: An observational study. Medicine (Baltimore) 2017; 96:e6404. [PMID: 28328838 PMCID: PMC5371475 DOI: 10.1097/md.0000000000006404] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Acute poisoning with drugs and nonpharmaceutical agents represents an important challenge in the emergency department (ED).The objective is to create and validate a risk-prediction nomogram for use in the ED to predict the risk of in-hospital mortality in adults from acute poisoning with drugs and nonpharmaceutical agents.This was a prospective cohort study involving adults with acute poisoning from drugs and nonpharmaceutical agents admitted to a tertiary referral center for toxicology between January and December 2015 (derivation cohort) and between January and June 2016 (validation cohort). We used a program to generate nomograms based on binary logistic regression predictive models. We included variables that had significant associations with death. Using regression coefficients, we calculated scores for each variable, and estimated the event probability. Model validation was performed using bootstrap to quantify our modeling strategy and using receiver operator characteristic (ROC) analysis. The nomogram was tested on a separate validation cohort using ROC analysis and goodness-of-fit tests.Data from 315 patients aged 18 to 91 years were analyzed (n = 180 in the derivation cohort; n = 135 in the validation cohort). In the final model, the following variables were significantly associated with mortality: age, laboratory test results (lactate, potassium, MB isoenzyme of creatine kinase), electrocardiogram parameters (QTc interval), and echocardiography findings (E wave velocity deceleration time). Sex was also included to use the same model for men and women. The resulting nomogram showed excellent survival/mortality discrimination (area under the curve [AUC] 0.976, 95% confidence interval [CI] 0.954-0.998, P < 0.0001 for the derivation cohort; AUC 0.957, 95% CI 0.892-1, P < 0.0001 for the validation cohort).This nomogram provides more precise, rapid, and simple risk-analysis information for individual patients acutely exposed to drugs and nonpharmaceutical agents, and accurately estimates the probability of in-hospital death, exclusively using the results of objective tests available in the ED.
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Affiliation(s)
- Catalina Lionte
- Internal Medicine and Clinical Toxicology Department, “Grigore T. Popa” University of Medicine and Pharmacy
| | - Victorita Sorodoc
- Internal Medicine and Clinical Toxicology Department, “Grigore T. Popa” University of Medicine and Pharmacy
| | | | - Alina Botezat
- Romanian Academy—“Gh. Zane” Institute for Economic and Social Research Teodor Codrescu No. 2, Iasi, Romania
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Elie D, Noohi S, Do A, Mahdanian A, Yu C, Segal M, Looper KJ, Rej S. Citalopram and escitalopram: adverse cardiac outcomes in medically ill inpatients. Ther Adv Drug Saf 2016; 7:225-226. [PMID: 27695624 DOI: 10.1177/2042098616660947] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Dominique Elie
- Irving Ludmer Research & Training Building, McGill University, 1033 Pine Avenue West, Montreal, QC, H3A 1A1, Canada
| | - Saeid Noohi
- Geri-PARTy Research Group, Department of Psychiatry, McGill University, Montreal, QC, Canada
| | - André Do
- Geri-PARTy Research Group, Department of Psychiatry, McGill University, Montreal, QC, Canada
| | - Artin Mahdanian
- Geri-PARTy Research Group, Department of Psychiatry, McGill University, Montreal, QC, Canada
| | - Ching Yu
- Geri-PARTy Research Group, Department of Psychiatry, McGill University, Montreal, QC, Canada
| | - Marilyn Segal
- Geri-PARTy Research Group, Department of Psychiatry, McGill University, Montreal, QC, Canada
| | - Karl J Looper
- Geri-PARTy Research Group, Department of Psychiatry, McGill University, Montreal, QC, Canada
| | - Soham Rej
- Geri-PARTy Research Group and Division of Geriatric Psychiatry, Department of Psychiatry, University of Toronto, Toronto, ON, Canada
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14
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Lionte C, Sorodoc V, Tuchilus C, Cimpoiesu D, Jaba E. Biomarkers, lactate, and clinical scores as outcome predictors in systemic poisons exposures. Hum Exp Toxicol 2016; 36:651-662. [PMID: 27457800 DOI: 10.1177/0960327116660866] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Acute exposure to systemic poisons represents an important challenge in clinical toxicology. We aimed to analyze the potential role of cardiac biomarkers, routine laboratory tests, and clinical scores as morbidity and in-hospital mortality predictors in patients intoxicated with various systemic poisons. We conducted a prospective study on adults acutely exposed to systemic poisons. We determined the PSS, Glasgow Coma Scale (GCS), and we performed electrocardiogram, laboratory tests, lactate and cardiac biomarkers (which were reassessed 4 h, respectively 6 h later). Of 120 patients included, 45% developed complications, 19.2% had a poor outcome, and 5% died. Multivariate logistic regression sustained lactate (odds ratio (OR) 1.58; confidence interval (CI) 95%: 0.97-2.59; p 0.066), MB isoenzyme of creatine kinase (6h-CKMB; OR 1.08; CI 95%: 1.02-1.16; p 0.018) as predictors for a poor outcome. A GCS < 10 (OR 0.113; CI 95%: 0.019-0.658; p 0.015) and 4h-lactate (OR 4.87; CI 95%: 0.79-29.82; p 0.087) predicted mortality after systemic poisons exposure. Receiver operating characteristic analysis showed that brain natriuretic peptide (area under the curve (AUC), 0.96; CI 95%: 0.92-0.99; p < 0.001), lactate (AUC, 0.91; CI 95%: 0.85-0.97; p < 0.001), and 6h-CKMB have good discriminatory capacity for predicting a poor outcome. In conclusion, these biomarkers, lactate, and GCS can be used to predict morbidity and mortality after systemic poisons exposure.
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Affiliation(s)
- C Lionte
- 1 Second Medical Clinic, "Sf. Spiridon" Emergency Clinical County Hospital, Iasi, Romania.,2 "Gr. T. Popa" University of Medicine and Pharmacy, Iasi, Romania
| | - V Sorodoc
- 1 Second Medical Clinic, "Sf. Spiridon" Emergency Clinical County Hospital, Iasi, Romania.,2 "Gr. T. Popa" University of Medicine and Pharmacy, Iasi, Romania
| | - C Tuchilus
- 2 "Gr. T. Popa" University of Medicine and Pharmacy, Iasi, Romania.,3 Central Laboratory, "Sf. Spiridon" Emergency Clinical County Hospital, Iasi, Romania
| | - D Cimpoiesu
- 2 "Gr. T. Popa" University of Medicine and Pharmacy, Iasi, Romania.,4 Department of Emergency Medicine, "Sf. Spiridon" Emergency Clinical County Hospital, Iasi, Romania
| | - E Jaba
- 5 Department of Statistics, FEAA, "Al. I. Cuza" University, Iasi, Romania
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Scalese MJ, Herring HR, Rathbun RC, Skrepnek GH, Ripley TL. Propofol-associated QTc prolongation. Ther Adv Drug Saf 2016; 7:68-78. [PMID: 27298717 DOI: 10.1177/2042098616641354] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
OBJECTIVES Propofol is a preferred agent for sedation in patients in the intensive care unit (ICU) due, in part, to its established safety profile. Despite this, recent case reports have suggested a potential for prolongation of the corrected QT interval (QTc) in ICU patients receiving propofol, though limited empirical work has been conducted to evaluate this association. As such, the purpose of this study was to assess the relationship between propofol infusion and QTc prolongation in a historical cohort of ICU patients. METHODS A single-center, historical, observational, pre-post cohort analysis of medical records from admitted patients ⩾18 years old with cardiovascular disease was conducted, involving cases who received propofol infusion for ⩾3 hours with sequential electrocardiogram monitoring from 2006 to 2012. A multivariable, generalized linear model regression was employed to assess the primary outcome of on-propofol QTc interval (QTc2), controlling for various demographic and clinical factors. RESULTS A total of 96 patients met inclusion criteria, averaging 56.1 ± 14.1 years of age and 86.1 ± 25.0 kg, with 37.5% being female. A mean prolongation in QTc interval of 30.4 ± 55.5 ms (p < 0.001) was observed during the propofol infusion, with 43.8% of cases exhibiting an on-infusion QTc2 of ⩾ 500 ms. Regression analyses suggested that prolongation in on-propofol QTc was independently associated with baseline QTc interval and amiodarone use, while weight as inversely associated with QTc2 (p < 0.05). CONCLUSION This historical cohort analysis of adult ICU patients receiving propofol suggests that on-infusion QTc prolongation was associated with increasing baseline QTc interval and with amiodarone use. Further research is needed to evaluate the clinical significance and cause-and-effect relationship between potential QTc changes and propofol use in the ICU.
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Affiliation(s)
- Michael J Scalese
- Auburn University Assistant Clinical Professor, Department of Pharmacy Practice Auburn University Harrison School of Pharmacy 650 Clinic Drive, Rm 2100 Mobile, AL 36688
| | - Holly R Herring
- Pharmacist, Department of Pharmacy, Integris Health Edmond, 4801 Integris Parkway, Edmond Oklahoma 73112
| | - R Chris Rathbun
- Professor and Chair, Department of Pharmacy: Clinical and Administrative Sciences, University of Oklahoma College of Pharmacy, 1110 N Stonewall Ave, Oklahoma City, OK 73117
| | - Grant H Skrepnek
- Associate Professor, Department of Pharmacy: Clinical and Administrative Sciences, University of Oklahoma College of Pharmacy, 1110 N Stonewall Ave, Oklahoma City, OK 73117
| | - Toni L Ripley
- Associate Professor, Department of Pharmacy: Clinical and Administrative Sciences, University of Oklahoma College of Pharmacy, 1110 N Stonewall Ave, Oklahoma City, OK 73117
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16
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Rotella JA, Taylor DM, Wong A, Greene SL. Accuracy of QT interval measurement on electrocardiographs displayed on electronic ‘smart’ devices. Emerg Med Australas 2016; 28:187-92. [DOI: 10.1111/1742-6723.12541] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Revised: 10/27/2015] [Accepted: 12/08/2015] [Indexed: 12/01/2022]
Affiliation(s)
- Joe-Anthony Rotella
- Victorian Poisons Information Centre; Austin Health; Melbourne Victoria Australia
- Department of Emergency Medicine; Austin Health; Melbourne Victoria Australia
| | - David McD Taylor
- Department of Emergency Medicine; Austin Health; Melbourne Victoria Australia
| | - Anselm Wong
- Victorian Poisons Information Centre; Austin Health; Melbourne Victoria Australia
- Department of Emergency Medicine; Austin Health; Melbourne Victoria Australia
| | - Shaun L Greene
- Victorian Poisons Information Centre; Austin Health; Melbourne Victoria Australia
- Department of Emergency Medicine; Austin Health; Melbourne Victoria Australia
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17
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Abstract
Patients with cardiomyopathy have a higher incidence of mood and anxiety disorders, resulting in greater probability for hospitalisation and increased risk for arrhythmia and death. We report a case of a 16-year-old boy with Danon disease, Wolff-Parkinson-White syndrome, and hypertrophic cardiomyopathy, who later developed depression and significant weight loss. The patient was successfully treated for his anxiety and depression with mirtazapine without any adverse cardiac effects.
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18
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Isbister GK. How do we assess whether the QT interval is abnormal: myths, formulae and fixed opinion. Clin Toxicol (Phila) 2015; 53:189-91. [PMID: 25695875 DOI: 10.3109/15563650.2015.1014044] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Geoffrey K Isbister
- School of Medicine and Public Health, University of Newcastle , New South Wales , Australia
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19
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Miura N, Saito T, Taira T, Umebachi R, Inokuchi S. Risk factors for QT prolongation associated with acute psychotropic drug overdose. Am J Emerg Med 2014; 33:142-9. [PMID: 25445869 DOI: 10.1016/j.ajem.2014.09.048] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2014] [Revised: 09/01/2014] [Accepted: 09/29/2014] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND Antipsychotic/Antidepressant use is a risk factor for QT interval (QT) prolongation and sudden cardiac death. However, it is unclear which drugs are risk factors for QT prolongation and torsades de pointes in cases of psychotropic drug overdose. METHODS After correction of QT data by Bazett formula (QTc), QTc was classified into 3 categories (QTc<440 milliseconds, 440 milliseconds≤QTc<500 milliseconds, and QTc≥500 milliseconds), and the blood concentration of each drug was classified as not detected, therapeutic range, or toxic range. The association of the blood concentration of each drug with QTc was analyzed using the ordinal logistic regression model. Drugs that induced QT-heart rate pairs higher than the at-risk line of Isbister's QT-heart rate nomogram (QT nomogram) were further analyzed using the binomial logistic regression model. RESULTS A total of 649 patients were enrolled in the study. The independent risk factors for QTc prolongation were therapeutic and toxic range of phenotiazine antipsychotic drug (therapeutic range: odds ratio [OR], 1.56 [P=.039]; toxic range: OR, 3.85 [P<.001]), and toxic range of cyclic antidepressants (OR, 2.39; P=.018). In addition, toxic range of phenotiazine antipsychotic drug (OR, 3.87; P=.012) and tricyclic antidepressants (OR, 4.94; P<.001) were risk factors for QT higher than the at-risk line of the QT nomogram. CONCLUSIONS The possibility of QT prolongation and torsades de pointes due to overdose of phenotiazine antipsychotic drug or tricyclic antidepressants requires particular consideration.
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Affiliation(s)
- Naoya Miura
- Department of Emergency and Critical Care Medicine, Tokai University School of Medicine, 143 Shimokasuya, Isehara, Kanagawa 259-1193, Japan.
| | - Takeshi Saito
- Department of Emergency and Critical Care Medicine, Tokai University School of Medicine, Isehara, Kanagawa 259-1143, Japan
| | - Takayuki Taira
- Department of Emergency and Critical Care Medicine, Tokai University School of Medicine, Isehara, Kanagawa 259-1143, Japan
| | - Rimako Umebachi
- Department of Emergency and Critical Care Medicine, Tokai University School of Medicine, Isehara, Kanagawa 259-1143, Japan
| | - Sadaki Inokuchi
- Department of Emergency and Critical Care Medicine, Tokai University School of Medicine, Isehara, Kanagawa 259-1143, Japan
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20
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QTc interval prolongation and torsade de pointes associated with second-generation antipsychotics and antidepressants: a comprehensive review. CNS Drugs 2014; 28:887-920. [PMID: 25168784 DOI: 10.1007/s40263-014-0196-9] [Citation(s) in RCA: 92] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
We comprehensively reviewed published literature to determine whether it supported the link between corrected QT (QTc) interval prolongation and torsade de pointes (TdP) for the 11 second-generation antipsychotics and seven second-generation antidepressants commonly implicated in these complications. Using PubMed and EMBASE, we identified four thorough QT studies (one each for iloperidone, ziprasidone, citalopram, and escitalopram), 40 studies specifically designed to assess QTc interval prolongation or TdP, 58 publications based on data from efficacy and safety trials, 18 toxicology studies, and 102 case reports. Thorough QT studies, QTc prolongation-specific studies, and studies based on efficacy and safety trials did not link drug-associated QTc interval prolongation with TdP. They only showed that the drugs reviewed caused varying degrees of QTc interval prolongation, and even that information was not clear and consistent enough to stratify individual drugs for this risk. The few toxicology studies provided valuable information but their findings are pertinent only to situations of drug overdose. Case reports were most informative about the drug-QTc interval prolongation-TdP link. At least one additional well established risk factor for QTc prolongation was present in 92.2 % of case reports. Of the 28 cases of TdP, six (21.4 %) experienced it with QTc interval <500 ms; 75 % of TdP cases occurred at therapeutic doses. There is little evidence that drug-associated QTc interval prolongation by itself is sufficient to predict TdP. Future research needs to improve its precision and broaden its scope to better understand the factors that facilitate or attenuate progression of drug-associated QTc interval prolongation to TdP.
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21
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Kogut C, Crouse EB, Vieweg WVR, Hasnain M, Baranchuk A, Digby GC, Koneru JN, Fernandez A, Deshmukh A, Hancox JC, Pandurangi AK. Selective serotonin reuptake inhibitors and torsade de pointes: new concepts and new directions derived from a systematic review of case reports. Ther Adv Drug Saf 2014; 4:189-98. [PMID: 25114780 DOI: 10.1177/2042098613492366] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
OBJECTIVE In the light of the recent United States Food and Drug Administration (FDA) warning to clinicians on using previously approved doses of citalopram because of the purported higher risk of torsade de pointes (TdP), we pursued the broader question: are selective serotonin reuptake inhibitor (SSRI) antidepressant agents as a group unsafe because they might induce QTc interval prolongation and TdP? METHOD We reviewed the literature and found only 15 case reports (6 of fluoxetine, 1 of sertraline and 8 of citalopram) of SSRI-associated QTc interval prolongation linking to TdP. RESULTS A total of 13 cases contained sufficient information for analysis. In the setting of TdP, QTc interval prolongation does not clearly relate to SSRI dose. CONCLUSION Applying conventional statistics as the FDA does may not be the best tool to study this phenomenon because SSRI-associated TdP is a very rare event and hence best understood as an 'extreme outlier'. Despite the limitations inherent in case report material, case reports on drug-associated QTc interval prolongation and TdP provide valuable information that should be considered along with other sources of information for clinical guidance.
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Affiliation(s)
- Christopher Kogut
- Department of Psychiatry, Virginia Commonwealth University, Richmond, VA, USA
| | | | - W Victor R Vieweg
- Departments of Psychiatry and Internal Medicine, Virginia Commonwealth University, 17 Runswick Drive, Richmond, VA 23238-5414, USA
| | - Mehrul Hasnain
- Department of Psychiatry, Memorial University, St John's, Newfoundland, Canada
| | - Adrian Baranchuk
- Department of Cardiology, Kingston General Hospital, Queen's University, Kingston, Ontario, Canada
| | - Geneviève C Digby
- Department of Cardiology, Kingston General Hospital, Queen's University, Kingston, Ontario, Canada
| | - Jayanthi N Koneru
- Department of Internal Medicine, Division of Cardiology and Cardiac Electrophysiology, Virginia Commonwealth University, Richmond, VA, USA
| | - Antony Fernandez
- Department of Psychiatry, Virginia Commonwealth University, and Psychiatry Service, Hunter Holmes McGuire Veterans Affairs Medical Center, Richmond, VA, USA
| | - Anand Deshmukh
- Department of Cardiovascular Medicine, The Cardiac Center of Creighton University, Omaha, NE, USA
| | - Jules C Hancox
- School of Physiology and Pharmacology and Cardiovascular Research Laboratories, Medical Sciences Building, University of Bristol, University Walk, Bristol BS8 1TD, UK
| | - Ananda K Pandurangi
- Department of Psychiatry, Virginia Commonwealth University, Richmond, VA, USA
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22
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Nachimuthu S, Assar MD, Schussler JM. Drug-induced QT interval prolongation: mechanisms and clinical management. Ther Adv Drug Saf 2014; 3:241-53. [PMID: 25083239 DOI: 10.1177/2042098612454283] [Citation(s) in RCA: 188] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The prolonged QT interval is both widely seen and associated with the potentially deadly rhythm, Torsades de Pointes (TdP). While it can occur spontaneously in the congenital form, there is a wide array of drugs that have been implicated in the prolongation of the QT interval. Some of these drugs have either been restricted or withdrawn from the market due to the increased incidence of fatal polymorphic ventricular tachycardia. The list of drugs that cause QT prolongation continues to grow, and an updated list of specific drugs that prolong the QT interval can be found at www.qtdrugs.org. This review focuses on the mechanism of drug-induced QT prolongation, risk factors for TdP, culprit drugs, prevention and monitoring of prolonged drug-induced QT prolongation and treatment strategies.
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Affiliation(s)
- Senthil Nachimuthu
- Baylor University Medical Center, Jack and Jane Hamilton, Heart and Vascular Hospital Dallas, TX, USA
| | - Manish D Assar
- Baylor University Medical Center, Jack and Jane Hamilton, Heart and Vascular Hospital Dallas, TX, USA
| | - Jeffrey M Schussler
- Baylor University Medical Center, Jack and Jane Hamilton, Heart and Vascular Hospital, 621 North Hall Street, Suite 500, Dallas, TX 75226, USA
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23
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Tereshchenko LG, Berger RD. Towards a better understanding of QT interval variability. Ther Adv Drug Saf 2014; 2:245-51. [PMID: 25083216 DOI: 10.1177/2042098611421209] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The International Conference on Harmonization of Technical Requirements for Registration of Pharmaceuticals for Human Use (ICH) Guideline E14 recommends 'Thorough QT Study' as a standard assessment of drug-induced QT interval prolongation. At the same time, the value of drug-induced QTc prolongation as a surrogate marker for risk of life-threatening polymorphic ventricular tachycardia known as torsades des pointes remains controversial. Beat-to-beat variability of QT interval was recently proposed as an alternative metric. The following review addresses mechanisms of beat-to-beat QT variability, methods of QT interval variability measurements, and its prognostic value in clinical studies.
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Affiliation(s)
- Larisa G Tereshchenko
- Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Ronald D Berger
- Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, Carnegie 592, 600 N. Wolfe St., Baltimore, MD 21287, USA
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24
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Isbister GK, Page CB. Drug induced QT prolongation: the measurement and assessment of the QT interval in clinical practice. Br J Clin Pharmacol 2014; 76:48-57. [PMID: 23167578 DOI: 10.1111/bcp.12040] [Citation(s) in RCA: 105] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2012] [Accepted: 11/06/2012] [Indexed: 01/22/2023] Open
Abstract
There has been an increasing focus on drug induced QT prolongation including research on drug development and QT prolongation, following the removal of drugs due to torsades de pointes (TdP). Although this has improved our understanding of drug-induced QT prolongation there has been much less research aimed at helping clinicians assess risk in individual patients with drug induced QT prolongation. This review will focus on assessment of drug-induced QT prolongation in clinical practice using a simple risk assessment approach. Accurate measurement of the QT interval is best done manually, and not using the measurement of standard ECG machines. Correction for heart rate (HR) using correction formulae such as Bazett's is often inaccurate. These formulae underestimate and overestimate the duration of cardiac repolarization at low and high heart rates, respectively. Numerous cut-offs have been suggested as an indicator of an abnormal QT, but are problematic in clinical practice. An alternative approach is the QT nomogram which is a plot of QT vs. HR. The nomogram has an 'at risk' line and QT-HR pairs above this line have been shown in a systematic study to be associated with TdP and the line is more sensitive and specific than Bazett's QTc of 440 ms or 500 ms. Plotting the QT-HR pair for patients on drugs suspected or known to cause QT prolongation allows assessment of the QT interval based on normal population QT variability. This risk assessment then allows the safer commencement of drugs therapeutically or management of drug induced effects in overdose.
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Affiliation(s)
- Geoffrey K Isbister
- Discipline of Clinical Pharmacology, University of Newcastle, Newcastle, NSW 2298, Australia.
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25
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Beach SR, Celano CM, Noseworthy PA, Januzzi JL, Huffman JC. QTc prolongation, torsades de pointes, and psychotropic medications. PSYCHOSOMATICS 2013; 54:1-13. [PMID: 23295003 DOI: 10.1016/j.psym.2012.11.001] [Citation(s) in RCA: 200] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2012] [Revised: 10/31/2012] [Accepted: 11/01/2012] [Indexed: 02/08/2023]
Abstract
BACKGROUND Prolongation of the corrected QT (QTc) interval is a key issue for patients who receive psychotropic medications. Such patients may have baseline clinical risk factors for QTc prolongation, and many psychotropic medications may further prolong this interval. This has great clinical relevance, as QTc prolongation is linked with dangerous arrhythmias, especially torsades de pointes (TdP). METHODS We summarize current literature regarding appropriate methods of calculating the QTc interval, the association of the QTc interval with TdP, and risk factors for QTc prolongation. We then review connections between psychiatric medications and QTc prolongation, with a specific focus on antidepressants and antipsychotics. RESULTS QTc interval prolongation is an established, though imperfect, risk marker for TdP. There are no well-controlled studies that assess the risk of TdP associated with psychotropic agents. There are limited data that selective serotonin reuptake inhibitors (SSRIs) as a class are linked to QTc prolongation; citalopram appears more likely than others to induce this phenomenon. Among antipsychotics, thioridazine remains the agent most associated with QTc prolongation; intravenous haloperidol also appears to carry an increased risk. Of the atypical antipsychotics, ziprasidone appears most likely to prolong the QTc interval. CONCLUSIONS The majority of patients in need of psychotropic medications display few risk factors for QTc prolongation and should be considered to be at low risk for TdP. The frequency of cardiac monitoring for patients receiving psychiatric medications should be individually determined, based on the prescribed agent(s) and additional risk factors for TdP.
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26
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Abstract
OBJECTIVE There is limited information on mirtazapine overdose, but cases of severe effects (seizures, serotonin toxicity and coma) have been reported. We aimed to investigate the clinical effects and complications of mirtazapine overdose. METHODS This was an observational case series of mirtazapine overdoses (> 120 mg) identified from admissions to a toxicology unit between January 1987 and August 2013. Demographic information, details of ingestion, clinical effects, ECG parameters (HR, QT and QRS), and length of stay were extracted from a clinical database. RESULTS From 267 mirtazapine overdoses, there were 89 single-agent mirtazapine ingestions and 178 cases where mirtazapine was taken with at least one other drug. The median age of the 89 single-agent mirtazapine ingestions was 36 years [interquartile range (IQR): 26-49 years; Range: 15-81 years]; 45 were female (51%). The median ingested dose was 420 mg (IQR: 270-750 mg; Range: 150-1350 mg) and 41 patients (46%) had a Glasgow coma score (GCS) < 15, but the minimum GCS was 10. There were no seizures, serotonin toxicity or delirium. Tachycardia occurred in 29 patients (33%) and hypertension in 32 patients (36%). The median QRS was 80 ms (Range: 80-120 ms) and there were no cases with QT prolongation. There were no arrhythmias and no deaths. The median length of stay was 14 h (IQR: 8.8-18.2 h; Range:2.2-75 h). No single-agent mirtazapine patient was admitted to intensive care. The 178 patients taking co-ingestants had more severe toxicity depending on the co-ingested drug. CONCLUSION Mirtazapine appears to be relatively benign in overdose, associated with tachycardia, mild hypertension and mild CNS depression not requiring intervention.
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Affiliation(s)
- I Berling
- Department of Clinical Toxicology and Pharmacology, Calvary Mater Newcastle , Newcastle, NSW , Australia
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27
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Pae CU, Wang SM, Lee SJ, Han C, Patkar AA, Masand PS. Antidepressant and QT interval prolongation, how should we look at this issue? Focus on citalopram. Expert Opin Drug Saf 2013; 13:197-205. [PMID: 24131458 DOI: 10.1517/14740338.2013.840583] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
INTRODUCTION Evidence increasingly points to the potential development of harmful cardiac side effects concomitant with the use of a number of psychotropic drugs, primarily traditional antipsychotics and tricyclic antidepressants. AREAS COVERED The US Food and Drug Administration announced safety warnings associated with the use of citalopram with QT interval prolongation in 2011 and 2012. This paper explores the clinical background of QT interval prolongation, clinical data related to antidepressants and QT interval prolongation, the clinical implications of safety issues associated with the use of antidepressants and future research directions. EXPERT OPINION Currently available evidence proposes that citalopram may not be definitely associated with the increase of cardiac mortality, although it should be related with increase of QT prolongation. A firm consensus regarding the cardiac safety issues associated with antidepressants has to be established in near future. Hence, the choice of an individual antidepressant regarding cardiac safety issues should be based on multiple factors; clinicians may need to select the best available antidepressant for each individual based on that patient's vulnerability, the proven efficacy and safety of each agent and a reasonable benefit:risk ratio, based on currently available findings.
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Affiliation(s)
- Chi-Un Pae
- The Catholic University of Korea, Psychiatry , Sosa-Dong, Wonmi-Gu, Bucheon, 420717 , Republic of Korea
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28
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Taylor D, Lenox-Smith A, Bradley A. A review of the suitability of duloxetine and venlafaxine for use in patients with depression in primary care with a focus on cardiovascular safety, suicide and mortality due to antidepressant overdose. Ther Adv Psychopharmacol 2013; 3:151-61. [PMID: 24167687 PMCID: PMC3805457 DOI: 10.1177/2045125312472890] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Depression and anxiety disorders are among the most common disorders treated by general practitioners (GPs) in the UK. Since both disorders are associated with a significantly increased risk of suicide, including with antidepressant overdose, the safety of antidepressants in overdose is of paramount importance. Numerous updates relating to antidepressant safety have been issued by regulators in the UK which may have eroded GP confidence in antidepressants. Venlafaxine, a serotonin nor adrenaline reuptake inhibitor (SNRI) had primary care prescribing restrictions placed on it in 2004 due to concerns about cardiotoxicity and mortality in overdose. Although a review of the evidence led to a reversal of the majority of restrictions in 2006, evidence suggests GPs may still be cautious in their prescribing of venlafaxine and possibly other SNRI antidepressants for patients with depression and anxiety disorders. This paper reviews the evidence pertaining to the safety of SNRI antidepressants from a perspective of cardiovascular safety and overdose. The currently available evidence suggests a marginally higher toxicity of venlafaxine in overdose compared with another SNRI duloxetine and the selective serotonin reuptake inhibitors (SSRIs), although this may be related to differential patterns of prescribing in high-risk patients. Based on this review SNRIs have a positive risk benefit profile in the treatment of depression and generalized anxiety disorder in primary care, especially as second-line agents to SSRIs.
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Affiliation(s)
- David Taylor
- Pharmacy Department, Maudsley Hospital, Denmark Hill, London SE5 8AZ, UK
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29
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Yates C, Manini AF. Utility of the electrocardiogram in drug overdose and poisoning: theoretical considerations and clinical implications. Curr Cardiol Rev 2013; 8:137-51. [PMID: 22708912 PMCID: PMC3406273 DOI: 10.2174/157340312801784961] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2010] [Revised: 06/12/2011] [Accepted: 07/02/2011] [Indexed: 11/22/2022] Open
Abstract
The ECG is a rapidly available clinical tool that can help clinicians manage poisoned patients. Specific myocardial effects of cardiotoxic drugs have well-described electrocardiographic manifestations. In the practice of clinical toxicology, classic ECG changes may hint at blockade of ion channels, alterations of adrenergic tone, or dysfunctional metabolic activity of the myocardium. This review will offer a structured approach to ECG interpretation in poisoned patients with a focus on clinical implications and ECG-based management recommendations in the initial evaluation of patients with acute cardiotoxicity.
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Affiliation(s)
- Christopher Yates
- Emergency Medicine Department / Clinical Toxicology Unit, Hospital Universitari Son Espases, Palma de Mallorca, Spain.
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30
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Czaja AS, Valuck RJ, Anderson HD. Comparative safety of selective serotonin reuptake inhibitors among pediatric users with respect to adverse cardiac events. Pharmacoepidemiol Drug Saf 2013; 22:607-14. [DOI: 10.1002/pds.3420] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2012] [Revised: 01/15/2013] [Accepted: 01/20/2013] [Indexed: 11/07/2022]
Affiliation(s)
- Angela S. Czaja
- Department of Pediatrics, School of Medicine; University of Colorado; Aurora CO USA
- Children's Hospital Colorado; Aurora CO USA
| | - Robert J. Valuck
- Department of Clinical Pharmacy, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado; Aurora CO USA
- Department of Epidemiology, Colorado School of Public Health; University of Colorado; Aurora CO USA
- Department of Family Medicine, School of Medicine; University of Colorado; Aurora CO USA
| | - Heather D. Anderson
- Department of Clinical Pharmacy, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado; Aurora CO USA
- Department of Epidemiology, Colorado School of Public Health; University of Colorado; Aurora CO USA
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31
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Maignan M, Danel V. Prise en charge préhospitalière des intoxications aiguës graves. ANNALES FRANCAISES DE MEDECINE D URGENCE 2013. [DOI: 10.1007/s13341-013-0291-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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32
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Cooke MJ, Waring WS. Citalopram and cardiac toxicity. Eur J Clin Pharmacol 2012; 69:755-60. [DOI: 10.1007/s00228-012-1408-1] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2012] [Accepted: 09/04/2012] [Indexed: 12/01/2022]
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Abstract
A number of different psychotropic agents have been associated with an increased risk of cardiovascular disease, and these relationships have been difficult to interpret due to the presence of confounding factors. Recently, there has been renewed interest in the potential for certain antidepressants to cause QT prolongation, which is a predisposing factor for arrhythmia. However, the optimum means of determining QT remains contentious due to discrepancies between methods that may be readily applied in a clinical setting versus more detailed techniques during regulatory assessment. A number of different pharmacological mechanisms might explain the occurrence of adverse cardiac effects, and these differ according to the type of antidepressant agent. Emerging data indicate that citalopram exhibits a dose-effect relationship for QT prolongation. Whereas cardiotoxicity is readily apparent in the context of intentional antidepressant overdose, the occurrence of cardiac effects as a result of therapeutic administration is less certain. Pre-existing cardiac disease and other factors that independently predispose to arrhythmia are important considerations. Therefore, clinical judgment is needed to evaluate the overall risk or benefit of a particular antidepressant in any patient. Close monitoring should be considered for those at greatest risk of QT prolongation and arrhythmia.
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Affiliation(s)
- W Stephen Waring
- Acute Medical Unit, York Teaching Hospital NHS Foundation Trust, York, UK
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34
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Sanaei-Zadeh H. Comment on "Serial monitoring of lead aVR in patients with prolonged unconsciousness following tricyclic antidepressant overdose". Psychiatry Investig 2012; 9:85-6. [PMID: 22396691 PMCID: PMC3285748 DOI: 10.4306/pi.2012.9.1.85] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/14/2011] [Revised: 09/09/2011] [Accepted: 09/27/2011] [Indexed: 11/19/2022] Open
Affiliation(s)
- Hossein Sanaei-Zadeh
- Department of Forensic Medicine and Toxicology, Tehran University of Medical Sciences, Hazrat Rasoul Akram Hospital, Tehran-IRAN
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35
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Eyer F, Pfab R, Felgenhauer N, Strubel T, Saugel B, Zilker T. Clinical and analytical features of severe suicidal quetiapine overdoses – a retrospective cohort study. Clin Toxicol (Phila) 2011; 49:846-53. [DOI: 10.3109/15563650.2011.624100] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Florian Eyer
- Toxicological Department, Klinikum rechts der Isar,
Ismaninger Strasse 22, Munich, Germany
| | - Rudolf Pfab
- Toxicological Department, Klinikum rechts der Isar,
Ismaninger Strasse 22, Munich, Germany
| | - Norbert Felgenhauer
- Toxicological Department, Klinikum rechts der Isar,
Ismaninger Strasse 22, Munich, Germany
| | - Tim Strubel
- Department of Psychiatry and Psychotherapy, Klinikum rechts der Isar,
Ismaninger Strasse 22, Munich, Germany
| | - Bernd Saugel
- Medical Intensive Care Unit, Klinikum rechts der Isar, II. Medizinische Klinik,
Ismaninger Strasse 22, Munich, Germany
| | - Thomas Zilker
- Toxicological Department, Klinikum rechts der Isar,
Ismaninger Strasse 22, Munich, Germany
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36
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Davis MP, Kirkova J, Lagman R, Walsh D, Karafa M. Intolerance to mirtazapine in advanced cancer. J Pain Symptom Manage 2011; 42:e4-7. [PMID: 21854992 DOI: 10.1016/j.jpainsymman.2011.05.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2011] [Accepted: 05/16/2011] [Indexed: 11/20/2022]
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37
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Loke YK, Ferro A, Lewis LD, Cohen AF, Somogyi A, Ritter JM. Editors' pick 2010. Br J Clin Pharmacol 2010; 71:3-6. [PMID: 21143495 DOI: 10.1111/j.1365-2125.2010.03862.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Affiliation(s)
- Yoon K Loke
- School of Medicine, University of East Anglia, Norwich, UK
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