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it decreases blood volume and preload

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โˆ™ 2012-03-07 00:11:26
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Q: Does diuretics decrease preload or afterload?
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Do angiotensin II blockers affect preload or afterload?


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.

In a healthy individual which of the following would be low Contractility Preload Stroke volume or Afterload.?


Dose morphine increase or decrease afterload?

Morphine decrease cathecolamines therefore decreases afterload.

What is myocardial contractility?

the strength of the contraction. The ability of the heart to contract independtely of preload and afterload.

Does morphine decrease or increase preload?

increase preload

What are 3 important factors affecting stroke volume?

Preload, afterload, and cardiac contractility or inotropy.

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 a Nursing intervention for pulmonary Edema?

1. Administer Oxygen 2. Decrease preload by getting patient to sit upright and dangle legs over side of bed, this decreased blood return to heart 3. Relieve anxiety, decreasing sympathetic drive. 4. Administer medication safely to reduce preload, afterload and contractility of the heart 5. Reduce movements of the patient, to decrease oxygen demands.

Why does left heart failure produce decreased contractility and increased preload and afterload?

When a person has hypertension, the ventricles will hypertrophy, which makes the chambers larger. Afterload is directly related to the chamber size, and contraction velocity is inversely related to afterload. Contraction velocity is a measure of contractility. So, as chambers hypertrophy, contactility decreases.

How does dehydration affect preload?

Severe dehydration will decrease preload because there won't be as much volume coming into the heart.

How does afterload affect the stroke volume?

Afterload refers to the pressure that the ventricles must overcome in order to eject blood. Hypertension increases the afterload, causing the end systolic volume to increase. The stroke volume will hence decrease.

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