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vasodilation, anemia, cirrhosis, shock states (results in massive vasodilation)
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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 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
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.
In a healthy individual which of the following would be low Contractility Preload Stroke volume or Afterload.?
afterload
What vessels provides right and left ventricular afterload?
The aorta and the pulmonary arteries provide right and left ventricular afterload. Afterload is the resistance the blood loaded into the heart when it tries to leave.
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.
What are 3 important factors affecting stroke volume?
Venous return controls EDV (end diastolic volume) and thus stroke volume and cardiac output. Venous return is dependent on: - blood volume and venous pressure - vasoconstriction caused by the sympathetic nervous system - skeletal muscle pumps - pressure drop during inhalation
What is afterload?
Afterload is the tension or stress developed in the wall of theleft ventricleduring ejection. In other words, it is the endLoadagainst which the heart contracts to eject blood.
What is the Resistance to flow or impedance to ventricular ejection referred to as?
Afterload
