Prioritize Syncope Testing by Diagnostic Yield and Cost Effectiveness
Clinical question: What are the utilization, yield, and cost effectiveness of tests used for evaluation of syncope in older patients?
Background: Clinicians utilize multiple diagnostic tests to help delineate the cause of syncope, but the yield and cost effectiveness of many of these tests are unclear. Further, it is unknown if considering patient characteristics, as in the San Francisco syncope rule (SFSR), can improve the yield of diagnostic tests.
Study design: Retrospective cohort.
Setting: Single acute-care hospital.
Synopsis: Review of 2,106 admissions in patients 65 and older with syncope revealed that the most common tests were electrocardiogram (99%), telemetry (95%), cardiac enzymes (95%), and head computed tomography (CT) scan (63%). The majority of tests did not affect diagnosis or management.
Postural blood pressure (BP) reading was infrequently recorded (38%) but had the highest yield. BP influenced diagnosis at least 18% of the time and management at least 25% of the time. Tests with the lowest likelihood of affecting diagnosis and management were head CT, carotid ultrasound, electroencephalography (EEG), and cardiac enzymes.
EEG had the highest cost per test affecting the diagnosis or management ($32,973), followed by head CT. The cost per test affecting diagnosis or management for postural BP was $17. Cardiac testing, including telemetry, echocardiogram, and cardiac enzymes, had significantly better yield in patients who met SFSR criteria.
Bottom line: In patients with syncope, the history and exam should guide evaluation, and tests with high yield and low cost per test, such as postural BP, should be prioritized.
Citation: Mendu ML, McAvay G, Lampert R, Stoehr J, Tinetti ME. Yield of diagnostic tests in evaluating syncopal episodes in older patients. Arch Intern Med. 2009;169(14): 1299-1305.
Early PCI is Superior to Delayed Intervention in Patients with STEMI Receiving Fibrinolytic Therapy
Clinical question: Does early percutaneous coronary intervention (PCI) improve clinical outcomes compared with standard management in patients with ST elevation myocardial infarction (STEMI) who receive fibrinolysis?
Background: Prior research has demonstrated the benefit of timely PCI in the management of acute coronary syndrome, specifically with ST elevation. However, many hospitals do not have this capability and utilize fibrinolysis as a standard alternative. The optimal timing of subsequent invasive intervention following fibrinolysis has not been established.
Study design: Multicenter randomized trial.
Setting: Fifty-two sites in three provinces in Canada.
Synopsis: This study randomized 1,059 patients presenting with STEMI and receiving fibrinolysis to early intervention (immediate transfer to another hospital with PCI less than six hours after fibrinolysis) versus standard intervention (rescue PCI if needed, or delayed angiography at more than 24 hours). The primary outcome was the composite of death, reinfarction, recurrent ischemia, new or worsening congestive heart failure, or cardiogenic shock within 30 days.
The primary outcome occurred in 11% of patients in the early intervention group, compared with 17.2% of patients randomized to standard intervention (RR 0.64, 95% CI, 0.47-0.87, P=0.004). Urgent catheterization was performed within 12 hours of fibrinolysis in 34.9% of patients randomized to the standard treatment group.
This study was not powered to detect differences in mortality and other individual components of the primary endpoint.
Bottom line: STEMI patients who received fibrinolysis had a lower risk of adverse outcomes when receiving transfer and PCI within six hours, compared with standard delayed intervention.
Citation: Cantor WJ, Fitchett D, Borgundvaag B, et al. Routine early angioplasty after fibrinolysis for acute myocardial infarction. N Engl J Med. 2009;360(26):2705-2718.