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Ischemic Stroke ll: Pathophysiology

Ischemic Stroke ll: Pathophysiology

An ischemic stroke occurs when a cerebral blood vessel becomes obstructed, most often by a thrombus or embolus, interrupting the delivery of oxygen and glucose to brain tissue. Because neurons rely on continuous aerobic metabolism, energy failure begins within minutes of reduced perfusion. The region receiving the least blood flow becomes the infarct core, an area of irreversible cellular death. Surrounding this core lies the penumbra, a zone of hypoperfused but still viable tissue that is...

Ischemic Heart Disease: Overview

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...

Ischemic Stroke l: Introduction

Ischemic Stroke l: Introduction

Ischemic stroke is an acute cerebrovascular condition in which blood flow to a brain region is suddenly interrupted, leading to tissue infarction. Neurons depend on continuous oxygen and glucose supply, so even brief reductions in perfusion cause energy failure, ionic imbalance, and irreversible injury. Ischemic strokes are classified into thrombotic and embolic types based on their underlying mechanisms.Thrombotic MechanismsThrombotic stroke develops when a clot forms within a cerebral artery.

Angina II: Classification

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Angina, also known as angina pectoris, is a chest pain resulting from diminished blood flow to the heart muscle and is often a symptom of coronary artery disease. Angina presents several variants with distinctive attributes, etiologies, and therapeutic approaches. The main types of angina include stable, unstable, variant (Prinzmetal's), microvascular, intractable, and silent ischemia.Stable angina is caused by atherosclerosis, which leads to the formation of plaques that narrow the coronary...

Transient Ischemic Attack l: Introduction

Transient Ischemic Attack l: Introduction

A transient ischemic attack (TIA) is a brief episode of neurological dysfunction caused by a temporary, focal reduction in cerebral blood flow. Although symptoms resemble those of an ischemic stroke, the interruption in perfusion is short-lived and does not cause permanent infarction. TIAs are clinically important because they often serve as early warning events for future stroke.Mechanisms of Transient Cerebral IschemiaTransient cerebral ischemia may arise through several mechanisms. One...

Acute Coronary Syndrome II: Pathophysiology and Clinical Manifestations

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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...

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Related Experiment Video

Updated: May 25, 2026

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis

Published on: December 28, 2012

Silent ischemia: clinical relevance.

C Richard Conti¹, Anthony A Bavry, John W Petersen

¹Department of Medicine, University of Florida College of Medicine, Gainesville, Florida 32610, USA.

Journal of the American College of Cardiology

|January 28, 2012

Summary

Silent ischemia, or myocardial ischemia without symptoms, is common in coronary artery disease. While past studies suggested revascularization benefits, current optimal medical therapy may be equally effective for preventing cardiovascular events.

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A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis

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Multimodality Diagnosis of Mesenteric Ischemia

Multimodality Diagnosis of Mesenteric Ischemia

Published on: July 21, 2023

Area of Science:

Cardiology
Ischemic Heart Disease
Clinical Trials

Background:

Asymptomatic (silent) ST-segment depression is more frequent than symptomatic ischemia in coronary artery disease patients.
Silent ischemia independently predicts adverse cardiovascular outcomes.
Early studies like ACIP suggested revascularization superiority over medical therapy for silent ischemia.

Purpose of the Study:

To evaluate the current role of silent ischemia in risk stratification for cardiovascular events.
To discuss the implications of recent trial data on managing silent ischemia.
To identify future research directions for silent ischemia, particularly in heart transplant recipients.

Main Methods:

Review of findings from the Asymptomatic Cardiac Ischemia Pilot Study (ACIP).
Analysis of results from the Clinical Outcomes Utilizing Revascularization and Aggressive Drug Evaluation (COURAGE) trial.
Discussion of current treatment paradigms for coronary artery disease.

Main Results:

The COURAGE trial indicated similar cardiovascular event rates between optimal medical therapy alone and revascularization plus optimal medical therapy.
Current medical therapy appears as effective as revascularization in managing symptomatic ischemia and preventing cardiovascular events.
Silent ischemia may persist despite current treatments and could still signify elevated cardiovascular risk.

Conclusions:

In the current era, optimal medical therapy is as effective as revascularization for preventing cardiovascular events.
Silent ischemia may remain a significant risk factor, even with optimal medical management.
Further research is needed to explore management strategies for persistent silent ischemia, especially in heart transplant patients, and to evaluate newer therapies.