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Doctor insights on: Will Thyroxin Increase 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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Can Synthroid (thyroxine) cause cardiac disturbances?

Can Synthroid (thyroxine) cause cardiac disturbances?

When overused: Yes. Taken in excess (or, much less commonly at a dose that's just too high for you) synthroid (thyroxine) can cause abnormal rhythms, particularly in the top chamber. These can manifest as palpitations, rapid heart rate, or even near-fainting symptoms. Lab tests can evaluate whether you have too much synthroid (thyroxine). ...Read more

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On 50 mcg of Synthroid (thyroxine) for mild hypothyroidism. I also have high blood press and tachycardia. In on topeol for. Could Synthroid (thyroxine) cause cardiac effects?

On 50 mcg of Synthroid (thyroxine) for mild hypothyroidism. I also have high blood press and tachycardia. In on topeol for. Could Synthroid (thyroxine) cause cardiac effects?

Unlikely: Synthroid (thyroxine) can cause high blood pressure and tachycardia if the dose is too high. The only way to prove this is to check your thyroid level. If the level is normal, i would look for another etiology for the symptoms above. Synthroid (thyroxine) 50 mcg is a very low dose and is unlikely to be the cause for your symptoms. See your doc to get your labs check. Good luck. ...Read more

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I'm curious what occurs if cardiac output increases? What if it decreases?

I'm curious what occurs if cardiac output increases? What if it decreases?

Constantly changing: Your cardiac output (which is the product of stroke volume and heart rate, expressed in liters per minute) is constantly changing in response to your metabolic needs. ...Read more

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Will acetylcholine raise cardiac output?

Will acetylcholine raise cardiac output?

No: Acetylcholine neurotransmission has an inhibitory effect on the heart, which lowers heart rate thereby decreasing cardiac output. ...Read more

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How can an increased cardiac output help exercise?

How can an increased cardiac output help exercise?

Exercise increase CO: Exercise increases cardiac output as it usually increases both heart rate(hr) and stroke volume (sv) (amount of blood ejected by the heart in each beat) as cardiac output (co) = hr x sv. It is a compensatory mechanism to keep up with the demands of oxygen by the body doing exercise. If the cardiac output would not increase, the body would not be able to perform for long. ...Read more

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Can you tell me how could an increased cardiac output help exercise?

Can you tell me how could an increased cardiac output help exercise?

Increase O2 delivery: During exercise, the muscles burn more oxygen for fuel. Increasing cardiac output increases the amount of oxygen carried by the blood to the tissues. ...Read more

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How can decreased cardiac output be caused by increased fluid volume ?

How can decreased cardiac output be caused by increased fluid volume ?

You have it reverse: Heart rate x stroke volume = cardiac output and thus if stroke volume decreases, cardiac output decreases or if heart rate decreases cardiac output decreases. ...Read more

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How is decreased cardiac output caused by increased fluid volume and decreased fluid volume?

How is decreased cardiac output caused by increased fluid volume and decreased fluid volume?

Stroke volume: Cardiac output is determined by heart rate and volume of blood pumped by heart in each heartbeat (stroke volume). Increased fluid volume increases the stroke volume and therefore cardiac output. Decreased fluid volume decreases the stroke volume and therefore cardiac output. ...Read more

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How can decreased cardiac output be caused by either increased fluid volume and decreased fluid volume?

How can decreased cardiac output be caused by either increased fluid volume and decreased fluid volume?

Cardiac output: When systolic dysfunction is present, volume overloading can result in decreased stroke volume and cardiac output. In any cardiac status, decreased intravascular volume will result in decreased cardiac output. ...Read more

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What could increase cardiac output?

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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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 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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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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Will epinephrine increase cardiac output?

Will epinephrine increase cardiac output?

Yes: It makes the heart contract more forcefully and makes it beat faster. Both effects will increase the cardiac output. ...Read more

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How does hypertension increase cardiac output?

How does hypertension increase cardiac output?

It doesn't: In a physiologic model, increased blood pressure or "hypertension" or increased "afterload" tends to decrease cardiac output. In a complete animal or human model, there are various reflexes that work to maintain cardiac output in the face of increased afterload but they shouldn't cause an increase in cardiac output relative to the baseline. ...Read more

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Why is there increased cardiac output in anemia?

Why is there increased cardiac output in anemia?

Contracts harder: The cardiac output is the stroke volume times the heart rate. So the heart has to contract harder and/or faster. Typically, in severe anemia, an echocardiogram would show the heart contractng harder than normal. ...Read more

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Dr. Sheila Smith
5 doctors shared insights

Cardiac (Definition)

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


Dr. David Sneid
1,406 doctors shared insights

Thyroxine (Definition)

Thyroxine is a thyroid ...Read more