Related Experiment Videos

Aspirin dose and six-month outcome after an acute coronary syndrome

Martin J Quinn1, Herbert D Aronow, Robert M Califf

  • 1St. Vincents University Hospital, Dublin, Ireland.

Journal of the American College of Cardiology
|March 19, 2004
PubMed

Insights

This study compared low and intermediate aspirin doses for acute coronary syndromes. Higher doses showed a trend toward reduced myocardial infarction but increased stroke risk, suggesting dose may influence outcomes.

Area of Science:

  • Cardiology
  • Clinical Pharmacology

Background:

  • Limited data exists on the comparative efficacy of low versus intermediate aspirin doses in patients with acute coronary syndromes.
  • Aspirin is a cornerstone therapy for acute coronary syndromes, but optimal dosing remains debated.

Purpose of the Study:

  • To compare the efficacy of low (<150 mg) versus intermediate (>=150 mg) aspirin doses in patients with acute coronary syndromes.
  • To evaluate the impact of discharge aspirin dose on six-month rates of death, myocardial infarction (MI), and stroke.

Main Methods:

  • A secondary analysis of the GUSTO IIb and PURSUIT trials included 20,521 patients with unstable angina or acute MI.
  • Patients were stratified by low (<150 mg) or intermediate (>=150 mg) aspirin dose at discharge.
  • Multivariable and propensity analyses were used to adjust for baseline differences.

Main Results:

  • No significant difference in the composite endpoint of death, MI, or stroke at six months between low and intermediate aspirin doses (HR 0.92; 95% CI 0.79-1.07).
  • Intermediate aspirin doses were associated with a reduction in six-month MI (HR 0.79; 95% CI 0.64-0.98).
  • Higher aspirin doses were linked to a significant increase in stroke (HR 1.74; 95% CI 1.01-3.02), with no significant effect on MI in propensity-matched analyses.

Conclusions:

  • Non-randomized data suggest that aspirin dose at discharge may impact clinical outcomes in acute coronary syndromes.
  • The findings highlight a potential trade-off between reducing MI and increasing stroke risk with higher aspirin doses.
Abstract

Related Concept Videos

Acute Coronary Syndrome IV: Interprofessional Care01:28

Acute Coronary Syndrome IV: Interprofessional Care

IntroductionThe management of Acute Coronary Syndrome (ACS) aims to minimize myocardial damage, preserve myocardial function, and prevent complications.Initial ManagementInpatient management involves continuous cardiac monitoring, preferably in an ICU, focusing on blood pressure, serum sodium, potassium, and creatinine levels, and urine output. Ongoing pharmacologic management is crucial for stabilizing the patient.Supplemental Oxygen: Administer supplemental oxygen if oxygen saturation is...
Acute Coronary Syndrome V: Nursing Management01:26

Acute Coronary Syndrome V: Nursing Management

Nursing Assessment:Nursing management of acute coronary syndrome (ACS) involves taking the patient's history, focusing on primary complaints such as chest pain, dyspnea, and excessive sweating (diaphoresis), as well as other symptoms like back or jaw pain, nausea, vomiting, palpitations, dizziness, and fatigue. The nurse also reviews the patient's history of cardiac events, risk factors such as hypertension, diabetes, smoking, family history, and current medications.In the objective assessment,...
Acute Coronary Syndrome III: Diagnostic Studies01:30

Acute Coronary Syndrome III: Diagnostic Studies

Diagnosing acute coronary syndrome or ACS begins with a thorough patient history. Notable symptoms include central, crushing chest pain radiating to the left arm, neck, jaw, or back, along with shortness of breath, sweating (diaphoresis), nausea, vomiting, dizziness, and palpitations.It is crucial to note any history of cardiac illnesses and assess risk factors, including age, gender, smoking, hypertension, diabetes, hyperlipidemia, and a sedentary lifestyle.During physical examination, vital...
Acute Coronary Syndrome I: Introduction01:30

Acute Coronary Syndrome I: Introduction

Acute Coronary Syndrome (ACS) encompasses a spectrum of heart conditions caused by sudden obstruction of coronary arteries, typically resulting from the rupture of an atherosclerotic plaque and subsequent thrombus (blood clot) formation. This obstruction can lead to partial or complete blockage of blood flow, causing varying degrees of myocardial ischemia or infarction.ACS includes the following clinical entities:Unstable Angina (UA)Non-ST-Elevation Myocardial Infarction (NSTEMI)ST-Elevation...
Coronary Artery Disease V: Interprofessional Care01:27

Coronary Artery Disease V: Interprofessional Care

Interprofessional care for coronary artery disease includes pharmacological therapy and revascularization procedures.Pharmacological therapy for Coronary Artery Disease (CAD) aims to manage symptoms, prevent complications, and improve patient outcomes through various classes of medications:Antiplatelet Agents:Aspirin and Clopidogrel: These medications inhibit platelet aggregation, preventing blood clots, which is crucial for avoiding heart attacks and strokes. Doctors often prescribe these...
Acute Coronary Syndrome II: Pathophysiology and Clinical Manifestations01:19

Acute Coronary Syndrome II: Pathophysiology and Clinical Manifestations

The pathophysiology of Acute Coronary Syndrome [ACD] involves several key processes:The main underlying cause of ACD is atherosclerosis, a chronic inflammatory disease characterized by the buildup of lipid-laden plaques within the coronary arteries.As the atherosclerotic plaque grows in the coronary artery, it may become unstable due to the formation of a lipid-rich core and a thin fibrous cap. Inflammatory cells within the plaque, such as macrophages, secrete enzymes that degrade the...