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A myocardial infarction is a heart attack; during this, the heart's beat effectively stops and the heart is no longer pumping blood in any useable amount. Therefore, a myocardial infarction causes cardiac output to drop significantly and possibly drop to zero depending on the severity.
What else can I help you with?
What is the normal compensatory response to a decreased cardiac contractility often seen in myocardial infarction?
Increase in heart rate as Cardiac Output = Heart rate x Stroke volume. As SV will be decreased, HR increases to compensate.
How is cardiac cycle affected by MI?
Myocardial infarction (MI) can disrupt the normal cardiac cycle by causing damage to the heart muscle, leading to impaired contraction and relaxation. This can result in diminished cardiac output, arrhythmias, and heart failure. The severity of these effects depends on the location and extent of the heart damage.
Why does pericarditis cause a reduction in cardiac output?
because the force of myocardial contraction weakens
What can happen when the heart muscle does not get enough blood?
Myocardial ischemia results from the temporary lack of oxygen; if ischemia is prolonged, it could result in permanent damage to the heart muscle. This condition is called myocardial infarction, commonly known as a heart attack.ischemia
Does cardiac output affect urine output?
Certainly. Decrease cardiac output would mean a decreased in blood flow to the kidneys, which would lead to reduced filtration, therefore urine output.
How does positive pressure ventilation affect cardiac output?
It increases intrathoracic pressure which decreases venous return to the heart and causes a decrease in cardiac output.
How does positive-pressure ventilation affect cardiac output?
It increases intrathoracic pressure which decreases venous return to the heart and causes a decrease in cardiac output.
How does tachycardia affect stroke volume and cardiac output?
Lowers stroke volume
How would a decrease in blood volume affect both stroke volume and cardiac output?
It's decreased ... unless the rate falls, which is the normal cardiac response.
Amount of blood pumped by the heart in 1 min?
cardiac output :)
How does myocardial infarction lead to heart failure?
Myocardial infarction (MI) can lead to heart failure in numerous ways. First of all, early on, the heart muscle does not contract well because it is not receiving enough oxygen and other necessary substrates, so stroke volume is decreased, which may lead to congestive heart failure. Later on, if the MI is aborted with thrombolytics or with a cardiac catheterization and thrombectomy, the myocardium may be stunned, or hibernating, because of the lack of oxygen, and may return to normal function over time. If the MI completes, the portion of cardiac muscle that was affected is dead. Depending on how significant a portion that is, losing the muscle alone may result in heart failure. The dead portion of the heart will later turn into a scar, which is noncontractile and also does not allow for the normal stretch, so it may affect preload and contractility in that way as well, decreasing cardiac output and possibly leading to congestive heart failure.
Does epinephrine decrease myocardial oxygen demand?
Yes, epinephrine can decrease myocardial oxygen demand by increasing coronary perfusion, improving cardiac output, and reducing systemic vascular resistance. However, high doses of epinephrine may increase myocardial oxygen demand due to its positive inotropic and chronotropic effects.
