In an effort to enhance patient safety in Opioid Treatment Programs (OTPs), the Substance Abuse and Mental Health Services Administration (SAMHSA) convened a multi-disciplinary Expert Panel on the Cardiac Effects of Methadone. Panel members reviewed the literature, regulatory actions, professional guidances, and OTPs’ experiences regarding adverse cardiac events associated with methadone. The Panel concluded that, to the extent possible, every OTP should have a universal Cardiac Risk Management Plan (incorporating clinical assessment, ECG assessment, risk stratification, and prevention of drug interactions) for all patients, and should strongly consider patient-specific risk minimization strategies (such as careful patient monitoring, obtaining ECGs as indicated by a particular patient’s risk profile, and adjusting the methadone dose as needed) for patients with identified risk factors for adverse cardiac events. The Panel also suggested specific modifications to informed consent documents, patient education, staff education, and methadone protocols.
Objectives Drug overdose is a leading cause of cardiac arrest and is currently the second leading cause of overall injury-related fatality in the United States. Despite these statistics, the incidence of adverse cardiovascular events (ACVEs) in emergency department (ED) patients following acute drug overdose is unknown. With this study, we address the 2010 American Heart Association Emergency Cardiovascular Care update calling for research to characterize the incidence of in-hospital ACVE following drug overdose. Methods This was a prospective cohort study at two tertiary care hospitals over 12 months. Consecutive adult ED patients with acute drug overdose were prospectively followed to hospital discharge. The main outcome was occurrence of in-hospital ACVE, defined as the occurrence of one or more of the following: myocardial injury, shock, ventricular dysrhythmia, and cardiac arrest. Results There were 459 ED patients with suspected drug overdose, of whom 274 acute drug overdose qualified and were included for analysis (mean [±SE] age = 40.3 [±1.0] years; 63% male). Hospital course was complicated by ACVE in 16 patients (some had more than one): 12 myocardial injury, three shock, two dysrhythmia, and three cardiac arrest. The incidence of ACVE was 5.8% overall (95% confidence interval [CI] = 3.6% to 9.3%) and 10.7% (95% CI = 6.6% to 16.9%) among inpatient admissions, with all-cause mortality at 0.7% (95% CI = 0.2% to 2.6%). Conclusions Based on this study of adult patients with acute drug overdose, ACVE may occur in up to 9.3% overall and up to 16.9% of hospital admissions. Implications for the evaluation and triage of ED patients with acute drug overdose require further study with regard to optimizing interventions to prevent adverse events.
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