What does this research mean for the field?

A conservative management strategy after thrombolytic therapy for acute myocardial infarction yields similar short- and long-term clinical outcomes as immediate or delayed invasive strategies, while significantly reducing morbidity and the need for percutaneous transluminal coronary angioplasty. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

The study aims to evaluate the effectiveness of immediate, delayed, and conservative treatment strategies after thrombolytic therapy for acute myocardial infarction.

May 1, 1990Circulation

Comparison of immediate invasive, delayed invasive, and conservative strategies after tissue-type plasminogen activator. Results of the Thrombolysis in Myocardial Infarction (TIMI) Phase II-A trial.

Q: What is the clinical evidence from this study?

Study design: RCT. Population: Acute myocardial infarction (n=586). Intervention: Immediate or delayed invasive strategy (PTCA) vs. Conservative strategy. Primary outcome: Predischarge contrast left ventricular ejection fraction.

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Key result

A conservative strategy after thrombolysis for AMI achieved similar predischarge LVEF (average 49.3%) and 1-year mortality (8.7%) compared to immediate or delayed invasive strategies.

Why the study?

Do immediate or delayed invasive strategies improve predischarge left ventricular ejection fraction compared to a conservative strategy in patients with acute myocardial infarction after thrombolytic therapy?

Population

586 patients with acute myocardial infarction after thrombolytic therapy

Comparison

Immediate invasive strategy or delayed invasive… vs Conservative strategy

Design

RCT, randomized among three treatment strategies

Follow-up

predischarge and 1-year

Authors

WRWilliam J. RogersGeneral Cardiology DBDonald S. BaimInterventional Cardiology JGJoel M. GoreGeneral Cardiology

Discussion

Member takes

Implication

Supports conservative post-thrombolysis care in AMI to reduce procedures; confirms equivalent outcomes versus routine invasive strategies.

Key Points

The study aims to evaluate the effectiveness of immediate, delayed, and conservative treatment strategies after thrombolytic therapy for acute myocardial infarction.
Randomized clinical trial of 586 patients across three treatment strategies: immediate invasive, delayed invasive, and conservative.
Immediate invasive included coronary arteriography post-therapy; delayed invasive waited 18-48 hours for angiography; conservative approach used PTCA only if ischemia occurred.
Primary endpoint was predischarge left ventricular ejection fraction.
Mean left ventricular ejection fraction was similar across groups (49.3%).
Immediate invasive strategy resulted in higher CABG rates (7.7%) compared to delayed (2.1%) and conservative (2.5%) (p<0.01).
At 1-year follow-up, all groups had similar mortality and reinfarction rates; however, the need for PTCA was higher in invasive strategies (75.8% immediate, 64.3% delayed, and 23.9% conservative).

Study Design

Type

RCT (n=586)

Randomization

Randomized

Structured PICO

Population

586 patients with acute myocardial infarction (AMI) after thrombolytic therapy (tissue-type plasminogen activator)

Intervention

Immediate invasive strategy (immediate coronary arteriography followed by PTCA if appropriate, n=195) or delayed invasive strategy (deferred angiography and PTCA for 18-48 hours, n=194)

Comparator

Conservative strategy (PTCA used only if ischemia occurred spontaneously or at the time of predischarge exercise testing, n=197)

Outcome

Predischarge contrast left ventricular ejection fractionsurrogate

Main Result

Absolute Event Rate: 49.3% vs 49.3%

A conservative strategy after thrombolytic therapy for AMI achieves similar LVEF and 1-year clinical outcomes compared to immediate or delayed invasive strategies, with less morbidity and lower PTCA use.

Cite This Study

Rogers et al. (1990) conducted an RCT in Acute myocardial infarction (n=586). Immediate or delayed invasive strategy (PTCA) vs. Conservative strategy was evaluated on Predischarge contrast left ventricular ejection fraction. A conservative strategy after thrombolysis for AMI achieved similar predischarge LVEF (average 49.3%) and 1-year mortality (8.7%) compared to immediate or delayed invasive strategies.

synapsesocial.com/papers/6a0896d2ae7f011b61ddf2ef https://doi.org/10.1161/01.cir.81.5.1457

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Implication

Supports conservative post-thrombolysis care in AMI to reduce procedures; confirms equivalent outcomes versus routine invasive strategies.

Comparison of immediate invasive, delayed invasive, and conservative strategies after tissue-type plasminogen activator. Results of the Thrombolysis in Myocardial Infarction (TIMI) Phase II-A trial.

Discussion

Member takes

Implication

Key Points

Study Design

Structured PICO

Main Result

Cite This Study

Comparison of immediate invasive, delayed invasive, and conservative strategies after tissue-type plasminogen activator. Results of the Thrombolysis in Myocardial Infarction (TIMI) Phase II-A trial.

Discussion

Member takes

Implication

Key Points

Study Design

Structured PICO

Main Result

Cite This Study

Also Consider

Also Consider