title: Incidence of pericardial effusion in patients presenting to the emergency department with unexplained dyspnea.
abstract: OBJECTIVE
  To evaluate the frequency of pericardial effusion in patients presenting to the emergency department (ED) with unexplained, new onset dyspnea.
  
  
  METHODS
  This prospective observational study took place at an urban community hospital ED with a residency program and an annual census of 65,000 visits. Patients presenting between May 1999 and January 2000 with new-onset dyspnea were eligible if they lacked any pulmonary, infectious, hematological, traumatic, psychiatric, cardiovascular, or neuromuscular explanation for their dyspnea after ED evaluation. Patients received a focused echocardiogram by certified emergency physicians. Data were recorded on standardized data sheets and studies were taped for review. Effusions were categorized as small when the fluid stripe measured less than 10 mm. Moderate-sized effusions measured 10 to 15 mm. Large effusions measured more than 15 mm.
  
  
  RESULTS
  One hundred three patients were enrolled. Median age was 56 years (IQR 44, 95% CI = 32 to 67). Fourteen patients (13.6%, 95% CI = 8% to 23%) had effusions. Four had large effusions that explained their dyspnea and were admitted to cardiology; two of these effusions were hemorrhagic, and two were viral in origin. Seven patients with small effusions were treated conservatively at home. Three patients had moderate-sized effusions; all were admitted but treated conservatively.
  
  
  CONCLUSIONS
  While limited by small numbers, these preliminary data suggest that patients with unexplained dyspnea should be checked for pericardial effusion when bedside ED ultrasound is available.
authors.affiliation: Department of Emergency Medicine, North Shore University Hospital, Manhasset, NY 11030, USA. blaivas@pyro.net
authors.forename: M
authors.initials: M
authors.lastname: Blaivas
mesh_terms: D000328:Adult; D017677:Age Distribution; D000368:Aged; D015897:Comorbidity; D004417:Dyspnea / Q000175:diagnosis* / Q000453:epidemiology*; D004452:Echocardiography / Q000379:methods; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data; D005260:Female; D006764:Hospitals, Community; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D010490:Pericardial Effusion / Q000175:diagnosis* / Q000453:epidemiology*; D011446:Prospective Studies; D012307:Risk Factors; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index; D017678:Sex Distribution; D015996:Survival Rate; D014463:Ultrasonography / Q000379:methods