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Doctor insights on: Affect 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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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 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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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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Can being a prior endurance athlete (but not currently trained) permanently affect cardiac output resulting in high numbers when all else is normal?

Can being a prior endurance athlete (but not currently trained) permanently affect cardiac output resulting in high numbers when all else is normal?

Athletic Heart: Interesting question! Former athletes have been shown to have more left ventricular hypertrophy or thickened hearts that usually lessens with age and deconditioning. A thick heart can lead to poor heart filling by increased stiffness. A condition called diastolic dysfunction. This can lead to a type of congestive heart failure if it persists. Controlling hr and BP via meds can help. ...Read more

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How do blood levels affect cardiac output?

How do blood levels affect cardiac output?

Levels = volumes?: Blood levels meaning blood volumes? Cardiac output is the volume of blood being pumped by the heart per minute. It is calculated by stroke volume x heart rate. Stroke volumeĀ is the volume of blood pumped from one ventricle of the heart with each beat. ...Read more

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How could vasoconstriction affect cardiac output?

How could vasoconstriction affect cardiac output?

It lowers it: Vasoconstriction increases the resistance to flow. This is called an afterload. It is like a pump having to pump water up a steep hill; it won't pump as well as on flat land. ...Read more

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How could hypertension affect cardiac output?

How could hypertension affect cardiac output?

Two ways: It can cause the heart muscle to get thick and stiff so that it does not relax and fill up with blood properly. It could also cause the heart muscle to become weak so that it does not squeeze or contract as forcefully. These are called diastolic dysfunction (too thick) or systolic dysfunction (weak and flabby). ...Read more

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Why doesn't tachycardia always affect cardiac output?

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. ...Read more

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How could hyperthyroidism affect cardiac output?

Hyperthyroidism: Hyperthyroidism is a excess metabolic state. If other systems are normal it will usually cause increased heart rate and cardiac output. In the face of a weak heart, it could be associated with decrease in cardiac output. Chronic hyperthyroidism can be associated with a cardiomyopathy causing decreased heart function. ...Read more

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How does noradrenaline affect cardiac output?

How does noradrenaline affect cardiac output?

Contractivity: Because it increases the contractivity of the heart as it is a catecholamine. ...Read more

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How do potassium levels affect cardiac output?

Not directly: Cardiac output is the amount of blood flow generated by the heart over a given time frame. Potassium is a critical electrolyte for body health and cardiac function, especially its rhythm. Although high or low potassium levels can create major, potentially fatal, irregularities in the heart rhythm, those levels do not directly affect the cardiac output per se. ...Read more

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Can you tell me how could decreased lung expansion affect cardiac output?

Can you tell me how could decreased lung expansion affect cardiac output?

Venous Return: The venous return to the heart depends on the expansion of the lung, the deeper the breath; the more blood will be returned to the heart. ...Read more

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How can peripheral vascular disease affect cardiac output?

How can peripheral vascular disease affect cardiac output?

Obstruction: The peripheral vessels are atherosclerotic-hardened and frequently partially blocked.
The heart is pumping into a stiff set of pipes.
Hypertension, high resistance have some effect.
Many folks with PVD also have coronary disease.
Up to 30-40%. ...Read more

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How can peripheral vascular disease affect cardiac output?

How can peripheral vascular disease affect cardiac output?

Obstruction: The peripheral vessels are atherosclerotic-hardened and frequently partially blocked.
The heart is pumping into a stiff set of pipes.
Hypertension, high resistance have some effect.
Many folks with PVD also have coronary disease.
Up to 30-40%. ...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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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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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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How does atrial and ventricular tachycardia affect blood pressure and cardiac output?

How does atrial and ventricular tachycardia affect blood pressure and cardiac output?

Different arrythmias: They come from different chamber (upper vs lower). Changes in BP and cardiac output depend on cardiac function, heart rate and and timing. Atrial fibrilation may decrease cardiac output about 15%. In ventricular tachycardia, BP and co will decrease more if it is long enough to become unstable. ...Read more

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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

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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

Dr. William Singer
5 Doctors shared insights

Cardiac (Definition)

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


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