Doctor insights on:
Will Thyroxin Increase Cardiac Output
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
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 moreSee 1 more doctor answer
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
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 moreSee 1 more doctor answer
How can decreased cardiac output be caused by either increased fluid volume and decreased fluid volume?
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 moreSee 1 more doctor answer
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
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 moreSee 1 more doctor answer
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