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What decreases cardiac output without change in heart rate PAWP or SVR Is it preload afterload or contractility?
A change in cardiac output without any change in the heart rate, pulmonary artery wedge pressure (PAWP = equated to preload) or systemic vascular resistance (SVR = afterload) would have to be due to a change in the contractility of the heart. Cardiac output (CO) is roughly equal to stroke volume x heart rate. Stroke volume is related to preload, contractility, and afterload. As you can see, the only variables you have not controlled for is cardiac contractility.
What causes decreased afterload?
Decreased afterload occurs when the resistance the heart must overcome to eject blood is reduced. This can be caused by factors such as vasodilation, which decreases systemic vascular resistance, or conditions like sepsis that lead to widespread blood vessel dilation. Additionally, medications such as ACE inhibitors or nitrates can also lower afterload by relaxing blood vessels. Ultimately, decreased afterload facilitates easier ventricular ejection, improving cardiac output.
What is myocardial contractility?
Cardiac contractility is the force of contraction possible for any given length of the cardiac muscle. It is related to the intracellular calcium levels.
Do angiotensin II blockers affect preload or afterload?
Afterload
What is the Resistance to flow or impedance to ventricular ejection referred to as?
Afterload
How phenylephrine effects cardiac rate?
Phenylephrine is an alpha agonist, which produces peripheral arteriolar constriction, thereby increasing afterload and causing reflex bradycardia in most cases.
What vessels provides right and left ventricular afterload?
The systemic arteries provide afterload for the left ventricle, while the pulmonary arteries provide afterload for the right ventricle. Afterload refers to the resistance that the ventricles must overcome to eject blood during systole.
In a healthy individual which of the following would be low Contractility Preload Stroke volume or Afterload.?
afterload
Dose morphine increase or decrease afterload?
Morphine decrease cathecolamines therefore decreases afterload.
How does a beta blocker help tachycardia?
Reduces the work load and increases cardiac output
What effect does Sodium Nitroprusside have on afterload and preload?
It decreases preload and afterload as a result of the dilation in the venous and arterial vasculature from the nitric oxide.
When does the intra- aortic balloon pump inflate?
The intra-aortic balloon pump inflates during diastole to increase coronary artery perfusion and cardiac output, and deflates during systole to reduce afterload on the heart.
