Detection of acute changes in circulating troponin in the setting of transient stress test-induced myocardial ischaemia using an ultrasensitive assay: results from TIMI 35
Key result
Novel ultrasensitive TnI assay detects quantifiable troponin increases linked to transient stress-induced myocardial ischemia.
Why the study?
Does a novel ultrasensitive cardiac TnI assay detect acute changes in circulating troponin in patients with transient stress test-induced myocardial ischaemia compared to commercial assays?
Population
120 patients undergoing stress testing with nuclear perfusion imaging (TIMI 35 cohort)
Comparison
Measurement of troponin using a novel… vs Measurement using commercial troponin assays
Design
Cohort
Follow-up
4 hours
Authors
Discussion
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Member takes
Implication
May detect transient ischaemia via ultrasensitive TnI; leaves open diagnostic role pending prospective validation.
Key Points
- The aim is to evaluate whether an ultrasensitive assay can measure troponin changes during stress test-induced myocardial ischaemia.
- Blood samples from 120 patients were obtained before, immediately after, and at 2 and 4 hours post-stress testing.
- Troponin levels were analyzed using both commercial assays and a novel ultrasensitive cardiac TnI assay.
- Troponin changes were assessed in relation to myocardial ischaemia severity.
- Troponin increased by a median of 1.4 pg/mL (24% increase, P = 0.002) in mild ischaemia and 2.1 pg/mL (40% increase, P = 0.0006) in moderate-to-severe ischaemia.
- No significant troponin change was observed in patients without ischaemia.
- A >1.3 pg/mL increase in TnI was an independent predictor of ischaemia (odds ratio 3.54, P = 0.007) using the ultrasensitive assay.
Structured PICO
Does a novel ultrasensitive cardiac TnI assay detect acute changes in circulating troponin in patients with transient stress test-induced myocardial ischaemia compared to commercial assays?
P
Population
120 patients undergoing stress testing with nuclear perfusion imaging (TIMI 35 cohort)
I
Intervention
Measurement of troponin using a novel, ultrasensitive cardiac TnI assay (limit of detection 0.2 pg/mL) at baseline, immediately after, and 2 and 4 hours post-stress testing
C
Comparator
Measurement using commercial troponin assays
O
Outcome
Changes in circulating cardiac troponin levels at 4 hours post-stress testing across different ischaemic categoriessurrogate
An ultrasensitive TnI assay can detect acute, quantifiable increases in circulating troponin following transient stress test-induced myocardial ischemia, which standard commercial assays fail to detect.
Cite This Study
Sabatine et al. (2008) studied this question. Transient stress test-induced myocardial ischaemia is associated with a quantifiable increase in circulating troponin detectable by a novel, ultrasensitive troponin I assay.