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Doctor insights on: Cardiac Output

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Dr. Cynthia Archer
918 Doctors shared insights

Cardiac Output (Overview)

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 a person's heart is.


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What's cardiac output?

What's cardiac output?

Heart pump volume: The cardiac output is the volume of blood per minute pumped by the heart. Cardiac output is equal to heart rate multiplied by stroke volume (the volume of blood ejected with each heartbeat). ...Read more

Dr. Cynthia Archer
918 Doctors shared insights

Cardiac Output (Overview)

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 a person's heart is.


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Can you define cardiac output?

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. ...Read more

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What influences cardiac output?

What influences cardiac output?

Multiple things: Cardiac output is the product of heart rate in stroke volume. Thus, an increase in heart rate results in an increase in cardiac output. Stroke volume can be affected by changes in preload, afterload, and contractility (strength of contraction). Preload is "priming the pump". Afterload is the resistance to ejection during systole (contraction). ...Read more

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How is cardiac output calculated?

How is cardiac output calculated?

Indirectly: Indirectly, by equating the right cardiac output with the left cardiac output and putting a swan ganz catheter into the pulmonary artery. Or calculating the difference between the arteriol and venous oxygen content; this is called the fick formula. ...Read more

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Is cardiac output the same as ef%?

Is cardiac output the same as ef%?

Related but not the: Same. Co is a mathematical calculation of the amount of blood pump by the left ventricle of your heart in one minute (stroke volume x hr). The ejection fraction is a measurement of the percentage of blood leaving your left ventricle every time contract. Can be measure by 2d echocardiogram, cardiac catheterization, nuclear scan, mri. Hope it help. ...Read more

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What is an average cardiac output?

What is an average cardiac output?

5 L per minute: The average cardiac output is somewhere around 5 l per minute. Cardiac output varies with the size of the patient (larger patients have larger cardiac output). Cardiac output is increased in conditions such as fever, anemia, or pregnancy. ...Read more

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What could increase cardiac output?

Cardiac output: Basically an increase in demand for oxygen by the body. This may be physiological (exercise) or pathological (sepsis - infection - fever) or increased metabolism (hyper active thyroid gland - hyperthyroidism) or abnormal conducts (shunting of blood). ...Read more

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When could cardiac output decrease?

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. ...Read more

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How do you? Measure cardiac output?

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. ...Read more

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What is cardiac output influenced by?

What is cardiac output influenced by?

Disease & more: 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. ...Read more

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What are signs of high cardiac output?

Varies: Assuming a true high cardiac output syndrome, patients may feel flushed with a fast heart rate. Most are transient situations, but some illnesses and conditions may cause a sustained high output state, e.g., hyperthyroidism, anemia, arterio-venous malformations (congenital or acquired low resistance connections between arteries and veins), or disease like paget's. Requires confirmation by doctor. ...Read more

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What are normal cardiac output levels?

What are normal cardiac output levels?

5 liters/min: A typical cardiac output is approximately 5 l per minute. This can vary with the size of the patient with a larger patient having larger cardiac output. When the cardiac output is normalized for the size of the patient, this is called the cardiac index. A typical cardiac index would be 2.5. A number of medical conditions, such as fever or anemia, can increase the cardiac output. ...Read more

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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. ...Read more

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What factors can affect cardiac output?

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. ...Read more

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What are the components of cardiac output?

What are the components of cardiac output?

HR x SV: Cardiac output in its most simple form is heart rate x stroke volume. ...Read more

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Why would someone have low cardiac output?

Why would someone have low cardiac output?

Congestive heart: Failure can be cause of low cardiac output. If the pump is weak and failing then cardiac out put would be low. Very slow heart rate can also result in low cardiac output. ...Read more

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How does exercise affect the cardiac output?

How does exercise affect the cardiac output?

Exercise: In order to facilitate the increase in oxygen demand of the muscles during exercise, the heart rate and volume of blood per beat will go up. Cardiac output is the product of heart rate times stroke volume. Therefore cardiac output will increase with exercise. ...Read more

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How is cardiac output regulated in the body?

The old way was: Based on oxygen differences from artery to vein called the fick procedure. Then came "thermal dilution", now we can do it by echo. Just plug "cardaic output" into google to learn more. Www. Thepmc. Org. ...Read more

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What will happen if cardiac output decreases?

What will happen if cardiac output decreases?

Cardiac Output: This is the amount of blood the heart pumps. If it decreases but is still adequate for the demands of the body, nothing much will happen. If it decreases below the metabolic demands of the body, organ dysfunction and shock will occur if the output level is low enough. ...Read more

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How do beta-clockers increase cardiac output?

How do beta-clockers increase cardiac output?

They don't: Beta blockers do not increase cardiac output. If anything, they reduce cardiac output by reducing heart rate and the strength of contraction (contractility). ...Read more

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What will happen if cardiac output decreases?

What will happen if cardiac output decreases?

Cardiac Output: This is the amount of blood the heart pumps. If it decreases but is still adequate for the demands of the body, nothing much will happen. If it decreases below the metabolic demands of the body, organ dysfunction and shock will occur if the output level is low enough. ...Read more

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What is the average number for cardiac output?

What is the average number for cardiac output?

4 to 5 liters/min: Approximately 4-5 l per minute. The cardiac output is proportional to the size of the patient. You can "normalize" the cardiac output by dividing the cardiac output by the body surface area resulting in a "cardiac index". The cardiac index is typically 2-3 l per minute per meter squared. ...Read more

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Least cardiac output is used by which organ.?

Least cardiac output is used by which organ.?

Please clarify: I'm not sure where you are going with this question but I will do my best to help.
Most of the blood flow from the heart goes to vital organs such as the brain and kidneys. Some tissues and organs have variable blood flow according to conditional demand like muscle and skin. Connective tissues receive very little blood flow. ...Read more

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What are the factors that affect cardiac output?

What are the factors that affect 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. ...Read more

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What can result in a decrease in cardiac output?

What can result in a decrease in cardiac output?

Many thinks: Heart failure can lead to decreased output which can occur for a variety of reasons, the major one being a heart attack. Very slow heart rate can also lead to a decreased co which is the product of stroke volume and heat rate. ...Read more

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How could venoconstriction affect cardiac output?

How could venoconstriction affect cardiac output?

Venoconstriction?: Cardiac output is inversely proportional to total peripheral resistance (which is related to mean arterial pressure.) venoconstriction refers to the venous system and can't be measured. If venous return increases, preload increases, and by starling's law of the heart, cardiac output increases. However, severe venoconstriction could eventually diminish venous return and reduce co. Yes? ...Read more

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Describe the features of a cardiac output problem.?

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. ...Read more

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What factors in the body affect the cardiac output?

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. ...Read more

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What are factors that influence the 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. ...Read more

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What are? Influences that can alter cardiac output?

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 ...Read more

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What happens if cardiac output increases / decreases?

What happens if cardiac output increases / decreases?

Natural: This is the normal pattern of the heart's output based upon the load conditions. The amount of blood filling the heart may vary mildly over time and combined with your level of activity and the force against your heart's ejection of blood (after load) the cardiac output may vary. Most important is that the output does not drop very low as in severe volume loss or weakness of the heart muscle. ...Read more

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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. ...Read more

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What is the technical unit to measure cardiac output in?

What is the technical unit to measure cardiac output in?

L/min: It is measured in liters per minute. An average resting cardiac output would be about 5.6 l/min for males and 4.9 l/min for females. The cardiac output (co or q) = stroke volume × heart rate. ...Read more

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Can you tell me if cardiac output increases / decreases?

Can you tell me if cardiac output increases / decreases?

Both: In a normal person, cardiac output increase with exertion then returns to a normal or resting level. With a malfunctioning heart, cardiac output is frequently considered low or subnormal. ...Read more

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How can the change in posture affect on cardiac output?

How can the change in posture affect on cardiac output?

Posture does affect: With standing, blood pressure drops a little, and this is augmented by an increased HR. Over, Cardiac output stays the same overall. However, in heart failure, output can drop with changes of position and exertion. ...Read more

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What are some factors affecting abnormal cardiac output?

Many factors: Heart muscle not getting enough blood - ischemia. Abnormal heart muscle - cardiomyopathy. Valve disease. High blood pressure or too much afterload. Abnormal pumping rhythm. Difficulty filling heart. ...Read more

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What happens to the body when cardiac output is low and high?

What happens to the body when cardiac output is low and high?

Cardiac output: Low cardiac output has low bp, high heart rate, cold, clammy, impaired mention, may be short of breath, decreased urine output. High cardiac output usually the obverse with warm, bounding pulses, increased BP may have increased urine output. ...Read more

Dr. Qamar Khan
5 Doctors shared insights

Cardiac (Definition)

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