Ischemia and infraction

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ischemia AND infarction

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Merck Manual ischemia infarction definition

Ischemia is reduced blood flow to a tissue, causing inadequate oxygen and nutrient delivery. It is often reversible if blood flow is restored quickly.

Infarction is tissue death (necrosis) caused by prolonged or severe ischemia. It is generally irreversible.

Feature	Ischemia	Infarction
Blood supply	Reduced or interrupted	Prolonged interruption causes cell death
Tissue damage	Initially functional, potentially reversible	Permanent necrosis
Example in heart	Angina from transient coronary narrowing	Myocardial infarction (heart attack)
Example in brain	Transient ischemic attack may resolve	Ischemic stroke with brain infarction

Sequence:
Reduced perfusion -> ischemia -> cellular dysfunction -> irreversible injury -> infarction.

For the heart, myocyte function can be impaired within 1-2 minutes of ischemia, while death commonly begins after roughly 20-40 minutes of sustained severe ischemia (Robbins & Kumar Basic Pathology, section “Ischemic Heart Disease”). Myocardial infarction specifically means myocardial necrosis in a clinical setting of ischemia, as summarized by the Merck Manual.

Common causes: thrombosis, embolism, atherosclerotic arterial narrowing, vasospasm, external compression, or severe hypotension/shock.

New chest pressure, sudden weakness or facial droop, loss of speech, a cold painful limb, or severe abdominal pain can indicate acute ischemia or infarction and requires emergency assessment.

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One-page educational medical infographic titled “ISCHEMIA vs INFARCTION”. Clearly compare two concepts with simple icons and a central progression arrow: Reduced blood flow → Oxygen shortage → Cell dysfunction → Prolonged severe ischemia → Irreversible cell death (infarction). Include concise readable definitions: “Ischemia: reduced blood flow and oxygen delivery; often reversible if corrected promptly.” “Infarction: tissue necrosis from prolonged ischemia; irreversible.” Add a comparison panel with rows for blood flow, reversibility, tissue injury, and clinical examples. Include examples: heart: angina versus myocardial infarction; brain: transient ischemia versus ischemic stroke; intestine/limb: acute ischemia versus infarction. Add a small red emergency warning: sudden chest pressure, facial droop or weakness, severe abdominal pain, or cold painful limb needs emergency care. Use accurate professional medical educational content, simple anatomical heart and brain symbols, and make all wording legible.

One-page infographic: Ischemia vs Infarction

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