RESUMEN
Background Detecting significant coronary artery disease (CAD) in the general population is complex and relies on combined assessment of traditional CAD risk factors and noninvasive testing. We hypothesized that a CAD-specific heart rate variability (HRV) algorithm can be used to improve detection of subclinical or early ischemia in patients without known CAD. Methods and Results Between 2014 and 2018 we prospectively enrolled 1043 patients with low to intermediate pretest probability for CAD who were screened for myocardial ischemia in tertiary medical centers in the United States and Israel. Patients underwent 1-hour Holter testing, with immediate HRV analysis using the HeartTrends DyDx algorithm, followed by exercise stress echocardiography (n=612) or exercise myocardial perfusion imaging (n=431). The threshold for low HRV was identified using receiver operating characteristic analysis based on sensitivity and specificity. The primary end point was the presence of myocardial ischemia detected by exercise stress echocardiography or exercise myocardial perfusion imaging. The mean age of patients was 61 years and 38% were women. Myocardial ischemia was detected in 66 (6.3%) patients. After adjustment for CAD risk factors and exercise stress testing results, low HRV was independently associated with a significant 2-fold increased likelihood for myocardial ischemia (odds ratio, 2.00; 95% CI, 1.41-2.89 [P=0.01]). Adding HRV to traditional CAD risk factors significantly improved the pretest probability for myocardial ischemia. Conclusions Our data from a large prospective international clinical study show that short-term HRV testing can be used as a novel digital-health modality for enhanced risk assessment in low- to intermediate-risk individuals without known CAD. Clinical Trial Registration URL: http://www.ClinicalTrials.gov. Unique identifiers: NCT01657006, NCT02201017).
Asunto(s)
Frecuencia Cardíaca , Isquemia Miocárdica/fisiopatología , Medición de Riesgo/métodos , Anciano , Algoritmos , Enfermedad de la Arteria Coronaria/complicaciones , Ecocardiografía de Estrés , Prueba de Esfuerzo , Femenino , Humanos , Masculino , Persona de Mediana Edad , Isquemia Miocárdica/complicaciones , Isquemia Miocárdica/diagnóstico por imagen , Isquemia Miocárdica/epidemiología , Imagen de Perfusión Miocárdica , Estudios ProspectivosRESUMEN
Background Patients who have had an acute coronary syndrome ( ACS ) are at increased risk of recurrent cardiovascular events; however, paradoxically, high-risk patients who may derive the greatest benefit from guideline-recommended therapies are often undertreated. The aim of our study was to examine the management, clinical outcomes, and temporal trends of patients after ACS stratified by the Thrombolysis in Myocardial Infarction (TIMI) risk score for secondary prevention, a recently validated clinical tool that incorporates 9 clinical risk factors. Methods and Results Included were patients with ACS enrolled in the biennial Acute Coronary Syndrome Israeli Surveys ( ACSIS ) between 2008 and 2016. Patients were stratified by the TIMI risk score for secondary prevention to low (score 0-1), intermediate (2), or high (≥3) risk. Clinical outcomes included 30-day major adverse cardiac events (death, myocardial infarction, stroke, unstable angina, stent thrombosis, urgent revascularization) and 1-year mortality. Of 6827 ACS patients enrolled, 35% were low risk, 27% were intermediate risk, and 38% were high risk. Compared with the other risk groups, high-risk patients were older, were more commonly female, and had more renal dysfunction and heart failure ( P<0.001 for each). High-risk patients were treated less commonly with guideline-recommended therapies during hospitalization (percutaneous coronary intervention) and at discharge (statins, dual-antiplatelet therapy, cardiac rehabilitation). Overall, high-risk patients had higher rates of 30-day major adverse cardiac events (7.2% low, 8.2% intermediate, and 15.1% high risk; P<0.001) and 1-year mortality (1.9%, 4.6%, and 15.8%, respectively; P<0.001). Over the past decade, utilization of guideline-recommended therapies has increased among all risk groups; however, the rate of 30-day major adverse cardiac events has significantly decreased among patients at high risk but not among patients at low and intermediate risk. Similarly, the 1-year mortality rate has decreased numerically only among high-risk patients. Conclusions Despite an improvement in the management of high-risk ACS patients, they are still undertreated with guideline-recommended therapies. Nevertheless, the outcome of high-risk patients after ACS has significantly improved in the past decade, thus they should not be denied these therapies.
Asunto(s)
Síndrome Coronario Agudo/complicaciones , Adhesión a Directriz , Infarto del Miocardio/prevención & control , Intervención Coronaria Percutánea/métodos , Medición de Riesgo/métodos , Accidente Cerebrovascular/prevención & control , Terapia Trombolítica/métodos , Síndrome Coronario Agudo/terapia , Anciano , Femenino , Estudios de Seguimiento , Humanos , Incidencia , Israel/epidemiología , Masculino , Persona de Mediana Edad , Infarto del Miocardio/epidemiología , Infarto del Miocardio/etiología , Pronóstico , Estudios Prospectivos , Factores de Riesgo , Accidente Cerebrovascular/epidemiología , Accidente Cerebrovascular/etiología , Tasa de Supervivencia/tendencias , Factores de TiempoRESUMEN
BACKGROUND AND PURPOSE: Despite overwhelming evidence for the benefits of anticoagulation in patients with brain ischemia and atrial fibrillation, vast underuse has been reported. METHODS: Use of anticoagulation for secondary stroke prevention was assessed in the National Acute Stroke Israeli Survey registry (NASIS) of hospitalized patients with atrial fibrillation and acute brain ischemia. Logistic regression analysis was performed to evaluate the effects of clinical covariates on anticoagulation therapy at discharge, and anticoagulation use over time was assessed in subgroups of patients with identified barriers to anticoagulation utilization. RESULTS: There were 1254 survivors of acute brain ischemia with atrial fibrillation (mean age 77.2±10.6 years; 57.7% female). Between 2004 and 2013, the proportion of patients discharged on anticoagulation increased from 55% to 76.2%, and among those without perceived contraindications from 70% to 96% (P<0.0001). Older age, greater stroke severity, earlier registry period, and presence of contraindications were independent predictors of withholding therapy. Increased anticoagulation use over the years was observed even in patients with barriers to anticoagulation use, including patients with potential contraindications (P<0.001). CONCLUSIONS: In survivors of acute brain ischemia with atrial fibrillation, we observed a substantial increase in anticoagulation utilization within less than a decade. This change was mainly driven by greater utilization of anticoagulation in subgroups with traditional clinical barriers to anticoagulation use, indicating a shift in physicians' perceptions of the risk-benefit ratio of anticoagulation.