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75 percent patients of fainting need only 2 hours of monitoring in ED: Circulation

75 percent patients of fainting need only 2 hours of monitoring in ED: Circulation

Fainting, for most of the time is harmless, but in some cases, it can also occur due to serious medical conditions such as irregular heartbeat, or arrhythmia. Now, a new study published in the journal Circulation has found that low-risk patients can be sent home safely by a physician after spending two hours in the Emergency Department (ED), in absence of danger risks are detected in medium and high-risk patients, they can be sent home after six hours.

The arrhythmias usually come and go quickly, and the person’s heart rhythm returns to normal by the time the ambulance arrives or they reach the ED. Fear of these arrhythmias coming back have led to patients being kept in the ED for eight to 12 hours. Approximately half of all patients who are hospitalized for fainting across Canada are admitted so their heart rhythm can be monitored. However, only a small proportion of patients will experience a dangerous irregular heartbeat, heart attack or death within a month of fainting.

The optimal duration of cardiac rhythm monitoring following emergency department (ED) presentation for fainting (syncope) is poorly described. Venkatesh Thiruganasambandamoorthy, Department of Emergency Medicine, University of Ottawa, Canada, and colleagues sought to describe the incidence and time to arrhythmia occurrence to inform decisions regarding the duration of monitoring based on ED risk-stratification.

“Before this study, we didn’t know which fainting patients needed to be monitored in the Emergency Department, and how long they needed to be monitored. We didn’t know who needed to be hospitalized in order to catch life-threatening conditions. Now we have answers to these questions that will help improve patient care, and potentially reduce ED wait times and hospital admissions.” said Dr. Thiruganasambandamoorthy.

In this observational study, they used the tool to rank 5,581 patients from six EDs across Canada as low (0.4 percent risk of an arrhythmia within 30 days), medium (8.7 percent) or high risk (25.3 percent). They collected baseline characteristics, time of syncope and ED arrival, and the Canadian Syncope Risk Score (CSRS) risk category.

Out of the 5,581 people, 74 percent were classified as low-risk, 19 percent as medium-risk and 7 percent as high-risk. One month after fainting, 3.7 percent of individuals (207) suffered an arrhythmia.

Key Findings:

  • 5,581 patients (mean age 53.4 years, 54.5% females, 11.6% hospitalized) were available for analysis, including 346 (6.2%) for whom the 30-day follow-up was incomplete and were censored at the last follow-up time.
  • 417 (7.5%) patients suffered serious outcomes of which 207 (3.7%) were arrhythmic (161 arrhythmias, 30 cardiac device implantations, 16 unexplained death).
  • Overall, 4123 (73.9%) were classified as CSRS low-risk, 1062 (19.0%) medium and 396 (7.1%) high-risk.
  • The CSRS accurately stratified subjects as low (0.4% risk for 30-day arrhythmic outcome), medium (8.7% risk) and high-risk (25.3% risk).
  • One-half of arrhythmic outcomes were identified within 2-hours of ED arrival in low-risk and within 6-hours in medium and high-risk patients and the residual risk after these cut-points were 0.2% for low-risk, 5.0% medium and 18.1% high-risk patients.
  • Overall, 91.7% of arrhythmic outcomes among medium and high-risk patients including all ventricular arrhythmias were identified within 15-days.
  • None of the low-risk patients suffered ventricular arrhythmia or unexplained death while 0.9% medium-risk and 6.3% of high-risk patients suffered them.

“Our study suggests that three-quarters of the 200,000 fainting patients who come to Canadian Emergency Departments every year are at low risk of adverse events. They can safely be sent home once they’ve been in the ED two hours and a physician sees them,” said Dr. Thiruganasambandamoorthy.

“Outpatient cardiac rhythm monitoring for 15-days for selected medium-risk patients and all high-risk patients discharged from the hospital should also be considered,” concluded the authors.

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Source: With inputs from Circulation

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