What is the clinical evidence from this study?

Study design: Observational. Population: ST elevation during exercise (n=65). Intervention: Previous myocardial infarction vs. No previous myocardial infarction. Primary outcome: Termination of exercise due to angina (p=<0.001).

What does this research mean for the field?

In patients with exercise-induced ST elevation, prior myocardial infarction indicates left ventricular dysfunction rather than acute ischemia, whereas ST elevation in patients without prior infarction is primarily driven by active ischemia. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

March 1, 1988Clinical CardiologyOpen Access

The role of ischemia and ventricular asynergy in the genesis of exercise‐induced ST elevation

Q: What are the key findings of this study?

In patients with exercise-induced ST elevation, previous myocardial infarction was associated with less frequent angina (4% vs 100%, P<0.001) and more fixed thallium defects than no prior MI.

Q: What does this research mean for the field?

In patients with exercise-induced ST elevation, prior myocardial infarction indicates left ventricular dysfunction rather than acute ischemia, whereas ST elevation in patients without prior infarction is primarily driven by active ischemia. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

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Key result

Prior MI linked to ~96% less angina and more fixed defects during exercise-induced ST elevation.

P<0.001
n=65

Why the study?

Does the presence of previous myocardial infarction determine the mechanism of exercise-induced ST elevation?

Population

65 patients with ST elevation during exercise, including 50 patients with previous myocardial infarction and…

Comparison

Exercise testing with thallium-201 imaging… vs Patients with previous myocardial infarction…

Design

Cohort

Authors

RARohit AroraInnsbruck Medical University LIL. IoachimMount Sinai Medical Center DMDeborah MatzaMount Sinai Medical Center

Discussion

Member takes

Implication

Prior MI may indicate LV dysfunction over ischemia in exercise-induced ST elevation; leaves open whether this distinction warrants prospective validation or practice change.

Study Design

Type

Observational (n=65)

Structured PICO

Does the presence of previous myocardial infarction determine the mechanism of exercise-induced ST elevation?

Population

65 patients with exercise-induced ST elevation, including 50 with previous myocardial infarction and 15 without, evaluated retrospectively.

Exposure

Exercise testing with thallium-201 imaging (n=30), resting gated blood pool imaging (n=33), and/or cardiac catheterization (n=23).

Comparator

Patients with previous myocardial infarction (Group I) compared to patients without previous myocardial infarction (Group II).

Outcome

Clinical significance and underlying mechanisms (ischemia vs. ventricular asynergy) of ST-segment elevation during exercise.surrogate

Main Result

Absolute Event Rate: 4% vs 100%

p-value: p=<0.001

Exercise-induced ST elevation reflects left ventricular dysfunction in patients with prior Q-wave MI, but indicates active ischemia in those without prior MI.

Cite This Study

Arora et al. (1988) conducted an observational in ST elevation during exercise (n=65). Previous myocardial infarction vs. No previous myocardial infarction was evaluated on Termination of exercise due to angina (p=<0.001). In patients with exercise-induced ST elevation, previous myocardial infarction was associated with less frequent angina (4% vs 100%, P<0.001) and more fixed thallium defects than no prior MI.

synapsesocial.com/papers/6aa6c61d014c9b816df4fd90 https://doi.org/10.1002/clc.4960110303

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Implication

Prior MI may indicate LV dysfunction over ischemia in exercise-induced ST elevation; leaves open whether this distinction warrants prospective validation or practice change.

The role of ischemia and ventricular asynergy in the genesis of exercise‐induced ST elevation

Discussion

Member takes

Implication

Study Design

Structured PICO

Main Result

Cite This Study

The role of ischemia and ventricular asynergy in the genesis of exercise‐induced ST elevation

Discussion

Member takes

Implication

Study Design

Structured PICO

Main Result

Cite This Study

Also Consider

Also Consider