Troponin testing: an audit in three metropolitan hospitals

Healthcare providers frequently use troponin assays to assess cardiac health, but the optimal use of these tests remains debated. Prior research has shown that troponin levels can indicate myocardial infarction, yet the timing and frequency of testing are not always standardized. In some settings, single tests are used despite guidelines suggesting serial measurements. This gap motivated an investigation into how these tests are being used in real-world clinical settings. No prior work had resolved whether single or serial troponin tests are more commonly requested in emergency departments. Understanding current practices could help align clinical behavior with evidence-based guidelines. The study aimed to evaluate whether protocols for troponin testing were being followed in three hospitals. The results could provide insights into how well clinical guidelines are implemented in practice. This information is relevant to emergency medicine and laboratory medicine professionals.

The study aimed to evaluate the appropriateness of troponin I assay use in three hospitals. Researchers wanted to determine whether single or serial tests were being used in line with clinical guidelines. The focus was on assessing adherence to established protocols for troponin testing. The hospitals involved each had emergency departments and coronary care units. The study period spanned from 1 to 7 May 2002, approximately 27 to 42 months after the assay's introduction. The goal was to identify whether single tests were being overused or if serial testing followed recommended intervals. The researchers also wanted to assess whether dissemination efforts had influenced test usage patterns. The findings could inform future training and guideline reinforcement initiatives.

The study employed a cross-sectional survey design to assess troponin I assay use. Data were collected from three hospitals in Melbourne with emergency departments and coronary care units. All patients who had a troponin I assay requested between 1 and 7 May 2002 were included. The time frame was selected as 27 to 42 months after the assay's introduction. Researchers reviewed medical records to determine the number of single versus serial tests performed. They also examined the intervals between serial tests to assess protocol adherence. Information dissemination efforts, including protocols and guidance from opinion leaders, were part of the study's context. The analysis focused on statistical patterns in test usage across the three hospitals.

Troponin assays were requested for 333 patients during 351 symptom episodes. A single assay was used in 194 episodes (55%), and serial assays in 157 (45%). The proportion of single versus serial tests was consistent across all three hospitals (chi(2); P = 0.71). Of the 194 single assays, only 13 (7%) resulted in a myocardial infarction diagnosis. Serial testing followed the suggested protocol in all hospitals. The mean time between serial assays exceeded 6 hours at each site. Adherence to serial testing intervals was adequate according to the study's criteria. However, the extensive use of single assays raised concerns about appropriateness.

The study found that single troponin assays were used extensively, potentially inappropriately. While serial testing followed recommended protocols, single tests were requested in 55% of cases. Researchers suggest that single tests may not be sufficient for accurate diagnosis. The study does not propose new diagnostic thresholds or treatment protocols. The findings highlight a need for further education on appropriate troponin testing practices. The authors do not claim that single tests are never appropriate but note their limited diagnostic yield. The study does not suggest changes to existing guidelines but emphasizes adherence to them. The results could inform future training programs for emergency and cardiology staff.