Clinical medicineLesson 1 of 1 in the course Cardiovascular disease

Myocardial Infarction: Recognition, Mechanisms, Diagnosis, and Care

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

This lesson introduces myocardial infarction (MI), explains how it differs from related heart conditions, and describes its common and less typical symptoms. Recognizing symptoms matters because prompt medical assessment can be lifesaving.

A myocardial infarction occurs when blood supply to part of the heart muscle is substantially reduced or stopped long enough to cause heart-muscle cell death. The affected tissue is called the myocardium; inadequate oxygen delivery is called ischemia. MI is a dangerous form of acute coronary syndrome, a group of conditions involving a sudden change in blood flow to the heart.

All flashcards

What is a myocardial infarction?
It is death of part of the heart muscle after blood flow and oxygen delivery to that tissue become inadequate for long enough.
What is ischemia?
Ischemia is inadequate blood flow and oxygen delivery to tissue. In the heart, prolonged ischemia can cause myocardial cell death.
How does MI differ from unstable angina?
An MI includes heart-muscle cell death, often supported by a rise or fall in cardiac biomarkers. Unstable angina involves acute ischemic symptoms without evidence of myocardial cell death.
What symptoms can accompany chest discomfort in an MI?
Possible symptoms include shortness of breath, sweating, nausea or vomiting, dizziness, faintness, fatigue, palpitations, and reduced alertness.
What is a silent MI?
A silent MI causes few or no recognized symptoms. It may be identified later through an ECG, blood tests, or another examination.

Quiz questions

  1. How are STEMI and NSTEMI distinguished in the common ECG-based classification of myocardial infarction?Answer: STEMI has qualifying ST-segment elevation; NSTEMI lacks that defining elevation.
  2. What evidence generally supports a diagnosis of myocardial infarction?Answer: A rise or fall in cardiac biomarkers plus at least one other sign of ischemia.
  3. When is fibrinolysis considered as a treatment for STEMI?Answer: When timely primary PCI is unavailable and the person is eligible for fibrinolysis.
  4. When is oxygen used for a person with suspected myocardial infarction?Answer: When oxygen levels are low or the person is in respiratory distress.
  5. What is a common long-term effect of statins after myocardial infarction?Answer: They lower LDL cholesterol and reduce the risk of further cardiovascular events.

Based on the Wikipedia article Myocardial infarction, licensed CC BY-SA 4.0. Adapted into a summary, flashcards and quizzes.

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