# Top 20 Doctor insights on: How Does Rest Affect Cardiac Output

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## 1 How does rest affect cardiac output?

Lowers it: It temporarily lowers heart rate and cardiac output.

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Dr. Cynthia Archer
918 doctors shared insights

## Cardiac Output (Definition)

Cardiac output is a measurement of the amount of blood a person's heart can pump out during a set amount of time. The measurements help doctors figure out how strong or weak ...Read more

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## 2 Can cardiac output decrease or stay the same at rest?

Falls: When you rest, your heart rate falls, contractility falls, stroke volume falls, and as a result of all of the above, cardiac output falls.

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## 3 What happens if a man has a cardiac reserve of 400% and maximum cardiac output is 20 l/min, what is his resting cardiac output?

Great question: Sounds about normal for average individuals, but low for highly trained athletes. Resting cardiac output generally around 5 liters/min and 400% is 4 x the resting output. Not sure how you tested this, but it sounds about right for an average, healthy individual. If you are a highly trained athlete, or if you have symptoms of fatigue or shortness of breath, you may want to speak to a physician.

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## 4 Can you tell me if a man has a cardiac reserve of 400% and maximum cardiac output is 20 l/min, what is his resting cardiac output?

5 lpm: 5 liters per minute

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## 5 Clarify:cardiac output too high at rest? Echo:stroke volume 100ml by 70 bpm, that means cardiac out:7l/min; cardiac index would be 3, 57l/min*m2.Txs

High Cardiac Output: Cardiac output is calculated by multiplying stroke volume by heart rate. Since the amount of blood pumped by the heart is dependent on body surface area ie. A larger person needs more blood supply. If it is more than 6l/min in an average person, at rest , and associated with symptoms, the cause must be looked into.

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## 6 Why doesn't tachycardia always affect cardiac output?

Cardiac output: is stroke volume times heart rate. if stroke volume goes down more than heart rate goes up, cardiac output won't increase. stroke volume depends on preload (filling of the heart), afterload (resistance to flow), and contractility (how much the heart pumps for how much it is filled. For instance, if the heart rate goes up but the the heart doesn't have time to fill, output won't increase.

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## 7 Can you define cardiac output?

Cardiac output: Stroke volume times heart rate equals cardiac output. Stroke volume relates to myocardial contractility, vascular resistance, vascular volume, anemia and metabolic state. There are subcomponents to all of these.

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## 8 When could cardiac output decrease?

Low blood pressure: Cardiac output is related to the heart rate, and volume of blood the heart can pump with each heart beat. A low cardiac output occurs when the pump function of the heart is compromised by an event such as a heart attack or when the blood volume is reduced by and event such as dehydration, or bleeding.

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## 9 How do you ?Measure cardiac output?

Several: Can use 2d echo, mra of heart, and right heart cath. Cardiac output is the measure of how many liters per minute the blood is being circulated in the body.

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## 10 What exactly does cardiac output mean?

CO is the : Amount of oxygenated blood the heart pump from the left ventricle to the whole body in one minute. Stroke volume x heart rate.

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## 11 What factors can affect cardiac output?

Cardiac output: In strict physiologic terms, cardiac output is determined by something called stroke volume and heart rate. Heart rate is self-explanatory. Stroke volume is the amount of blood that the heart pumps out with each beat. This in turn is dependent on blood pressure, total blood volume, and how strong the heart contracts.

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## 12 What happen to cardiac output when you exercise?

It goes up!: It goes up to make sure there is enough oxygen for the exercising muscles.

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## 13 Describe the features of a cardiac output problem.?

Poor heart pumping: This is when the heart is unable to pump out enough blood. This can be caused by many things, including scarring of the heart after a heart attack, valve problems, infections, and other causes.

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## 14 What factors in the body affect the cardiac output?

Many factors: Congenital heart disease, vitamin b1 defiency, anemia, thyroid problem, renal disease, liver disease, brain disease, vascular disease, blood disease, atherosclerosis, valve disease - these are the biggest influencers of cardiac output.

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## 15 What are ?Influences that can alter cardiac output?

In general four: Cardiac output is influence by the amount of blood the heart recieves,the resistance against which the blood is ejected,the strength of contraction and the heart rate. For ex. CO increases with heart rate,increase in blood volume,increase in cardiac contraction and less resistance to ejection because of lower peripheral resistance. Clinical conditions that affects any 4 will alter cardiac output

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## 16 What happens when you have low or high cardiac output?

Fatigue: Low cardiac output will lead to fatigue and shortness of breath. High cardiac output failure caused by severe anemia or paget's disease have similar manifestation.

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## 17 Why would the cardiac output be the same for an athlete and a non-athlete?

CO=need: Your cardiac output will match your need. The difference between an athlete and a non-athlete is that the athlete can increase their co and reduce their need at peak exertion through conditioning and the rest of us can't. Think of a race car and an oldsmobile (both 8 cyl) traveling at 25 mph. They both use the same amount of gas but the former can go 200 mph, while the latter is sputtering at 100.

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## 18 I'm curious what could happen when cardiac output is low and what if it's high?

Low cardiac output: Cardiac output depends on heart rate and stoke volume. Therefore, the cardiac output increases when heart rate goes up in normal heart. However, when the heart is failing the stroke volume is lower as well as the cardiac out which is called heart failure . Sometimes, heart failure could occur when cardiac output is high due to other medical problems such as a severe anemia , hyperthyroidism, etc

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## 19 How can I maintain cardiac output?

Exercise: The only way is exercising so your heart can be more efficient . When you exercise your cardiac reserve and stroke volume increase.

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## 20 How do you calculate? Cardiac output?

Several: Can use 2d echo, mra of heart, and right heart cath. Cardiac output is the measure of how many liters per minute the blood is being circulated in the body.

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Dr. Scott Keith
5 doctors shared insights

## Cardiac (Definition)

Cardiac translates literally to "heart, " and any place the term is seen, such ...Read more