What does this research mean for the field?

In emergency department patients presenting with acute chest pain, elevated cardiac troponin I in the presence of electrocardiographic ischemia independently predicts major cardiac events within 72 hours, though with a low overall positive predictive value. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To evaluate the diagnostic and prognostic accuracy of cardiac troponin I (cTnI) for predicting major cardiac events in emergency department patients presenting with acute chest pain.

August 21, 2026Journal of the American College of CardiologyOpen Access

Cardiac troponin I as a predictor of major cardiac events in emergency department patients with acute chest pain

Q: What is the clinical evidence from this study?

Study design: Cohort. Population: acute chest pain (n=1047). Intervention: Elevated cardiac troponin I (cTnI) in the presence of ischemia. Primary outcome: major cardiac events within 72 h (OR 1.8, 95% CI 1.1 to 2.9).

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Key result

Elevated cTnI with ECG ischemia predicts ~80% higher risk of 72-hour major cardiac events.

OR 1.8
95% CI 1.1 to 2.9
n=1,047

Why the study?

Although cTnI correlates with complications in unstable angina, its prognostic significance in heterogeneous ED patients presenting with acute chest pain remained unclear.

Does cardiac troponin I predict major cardiac events in emergency department patients with acute chest pain?

Key Points

To evaluate the diagnostic and prognostic accuracy of cardiac troponin I (cTnI) for predicting major cardiac events in emergency department patients presenting with acute chest pain.
Enrolled 1,047 patients aged ≥30 years admitted to the emergency department for acute chest pain.
Collected serial cTnI and creatine kinase-MB (CK-MB) mass concentrations over the first 48 hours following symptom onset.
Evaluated sensitivity, specificity, receiver operating characteristic curves, and adjusted odds ratios for major cardiac events occurring within 72 hours.
Cardiac troponin I demonstrated a sensitivity of 47%, a specificity of 80%, and a positive predictive value of 19% for predicting major cardiac events.
Elevated cTnI combined with ischemic electrocardiographic changes was associated with an adjusted odds ratio of 1.8 (95% CI, 1.1 to 2.9) for major cardiac events within 72 hours.
In patients ruled out for myocardial infarction, cTnI was elevated in 26% of those with major complications compared with 5% for CK-MB, with an abnormal cTnI positive predictive value of 8%.

Study Design

Type

Cohort (n=1,047)

Structured PICO

Does cardiac troponin I predict major cardiac events in emergency department patients with acute chest pain?

Population

1,047 patients ≥30 years old admitted to the emergency department for acute chest pain, evaluated for major cardiac events within 72 hours.

Exposure

Cardiac troponin I (cTnI) measurement (collected serially during the first 48 h from symptom onset)

Comparator

Creatine kinase-MB fraction (CK-MB) mass concentration

Outcome

Major cardiac events within 72 hhard clinical

Main Result

Odds Ratio: 1.8 (95% CI 1.1–2.9)

In emergency department patients with acute chest pain, elevated cTnI is an independent predictor of short-term major cardiac events, though its positive predictive value is low in this heterogeneous population.

Limitations

The positive predictive value of an abnormal assay result was not high in this heterogeneous cohort.

Discussion

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Implication

cTnI may aid risk stratification in ED chest pain; leaves open incremental value over CK-MB for routine decisions.

Cite This Study

Polanczyk et al. (1998) conducted a cohort in acute chest pain (n=1,047). Elevated cardiac troponin I (cTnI) in the presence of ischemia was evaluated on major cardiac events within 72 h (OR 1.8, 95% CI 1.1 to 2.9). Elevated cardiac troponin I in the presence of ischemia on the electrocardiogram was associated with an increased risk of major cardiac events within 72 hours (adjusted OR 1.8; 95% CI 1.1 to 2.9).

synapsesocial.com/papers/6a886c620ed92560a218637b https://doi.org/10.1016/s0735-1097(98)00176-4

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Cardiac troponin I as a predictor of major cardiac events in emergency department patients with acute chest pain

Key Points

Study Design

Structured PICO

Main Result

Limitations

Discussion

Implication

Cite This Study

Cardiac troponin I as a predictor of major cardiac events in emergency department patients with acute chest pain

Key Points

Study Design

Structured PICO

Main Result

Limitations

Discussion

Implication

Cite This Study

Also Consider

Also Consider