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Related Concept Videos

Ischemic Heart Disease: Overview01:17

Ischemic Heart Disease: Overview

Ischemic heart disease occurs when the heart's blood supply dwindles, causing an ominous lack of oxygen and nutrients. This deficiency, stemming from reduced or obstructed blood flow, spells danger, leading to heart muscle damage and dysfunction.
Atherosclerosis, the primary malefactor, orchestrates this dangerous condition. It manifests as the accumulation of fatty deposits, akin to insidious plaques, within arterial walls. As time elapses, these plaques metamorphose, hardening and narrowing...
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Myocarditis is inflammation of the myocardium, which is the muscular layer of the heart.EtiologyMyocarditis has a diverse etiology, including a wide range of infectious and non-infectious causes:Infectious CausesViral: Common viruses include Coxsackie A and B, adenovirus, parvovirus B19, enteroviruses, and influenza A.Bacterial: Examples include infections caused by Streptococcus, Staphylococcus, and Mycoplasma species.Rickettsial: Infections like Rocky Mountain spotted fever can result in...
Myocarditis II: Clinical Features and Diagnostic Tests01:27

Myocarditis II: Clinical Features and Diagnostic Tests

Myocarditis is an inflammation of the heart muscle. The symptoms vary widely, encompassing asymptomatic presentations to severe, acute manifestations.Clinical PresentationAsymptomatic cases: In some instances, myocarditis may be asymptomatic, with the infection resolving without intervention. These cases often go undetected unless discovered incidentally through diagnostic imaging or tests conducted for other reasons.General Early Symptoms: Early symptoms of myocarditis are non-specific and can...
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...
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...
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...

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Related Experiment Video

Updated: Jul 19, 2026

Myocardial Infarction and Functional Outcome Assessment in Pigs
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Myocardial Infarction and Functional Outcome Assessment in Pigs

Published on: April 25, 2014

A new definition for myocardial infarction: what difference does it make?

Veikko Salomaa1, Heli Koukkunen, Matti Ketonen

  • 1Department of Epidemiology, KTL-National Public Health Institute, Mannerheimintie 166, FI-00300 Helsinki, Finland. veikko.salomaa@ktl.fi

European Heart Journal
|April 9, 2005
PubMed
Summary

The 2003 myocardial infarction (MI) definition using troponins identified 83% more definite MIs than older methods. These new MI patients, often older with diabetes, faced a higher cardiovascular death risk.

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Area of Science:

  • Cardiology
  • Public Health
  • Epidemiology

Background:

  • Evolving diagnostic criteria for myocardial infarction (MI) necessitate re-evaluation of case definitions.
  • The 2003 American Heart Association Scientific Statement introduced new diagnostic criteria for acute coronary events.
  • Assessing the impact of new definitions is crucial for population-based MI registers.

Purpose of the Study:

  • To evaluate the 2003 American Heart Association (AHA) MI case definition in a population-based study.
  • To compare the diagnostic yield of the 2003 AHA definition with the previous WHO MONICA definition.
  • To characterize patients identified as MI by the new definition and assess their outcomes.

Main Methods:

  • Analysis of hospitalized patients with suspected acute coronary syndromes from a large MI register.
  • Inclusion criteria: troponin T or I data plus at least one enzymatic marker of myocardial injury.
  • Comparison of MI case ascertainment between the 2003 AHA definition and the WHO MONICA definition.
  • Risk assessment for cardiovascular death within 1 year for newly identified MI patients.

Main Results:

  • The 2003 definition identified 83% more definite MIs compared to the WHO MONICA definition.
  • Patients identified by the 2003 definition were older, had higher rates of diabetes, and received less revascularization.
  • These additional MI patients (aged 25-74) had a 1.6-fold higher risk of 1-year cardiovascular death (95% CI 1.1-2.2).

Conclusions:

  • The 2003 MI definition, using troponins, identifies a significant new group of high-risk patients.
  • Changing diagnostic criteria pose challenges for tracking long-term MI trends and natural history studies.
  • Community-level MI event assessment requires adaptation to new diagnostic standards.