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Can You Explain Cardiac Output Monitoring
Most common method: Cardiac output is basically the amount of blood the heart pumps over a unit of time, usually measured in liters per minute. When divided by the heart rate, one gets a stroke volume calculation, or milliliters per beat. All these may be corrected for your body size for comparison with "normals". The most common technique is with thermodilution catheters, but non-invasive techniques are validated. ...Read moreSee 1 more doctor answer
All increase: Exercise causes an increased demand for blood flow to provide oxygen to the muscles doing the work. This is accomplished by increase in heart rate and stoke volume. Since cardiac output is determined by heart rate and stroke volume, it also goes up. Blood pressure also typically increases with strenuous exercise. ...Read more
Depends...: There are heart rhythmn disorders that do not begin with an elevated heart rate. Not all cardiac arrhythmias are due to an elevated heart rate. There are rhythmn disorders that have a normal heart rate or even a slow heart rate. A normal or slow heart rate does not rule put an arrhythmia. ...Read moreSee 2 more doctor answers
Typically decreased: Dilated cardiomyopathy in the classic form has greatest effect on the left ventricle, which is responsible for pumping blood to the body. In dilated cardiomyopathy, the muscle that makes up the left ventricle is weaker than normal and has less reserve. Therefore, typically, the cardiac output is less than normal and the ability to increase cardiac output for exercise is blunted. Meds can help. ...Read more
Anesthesia: Propofol is an anesthesia. It goes to the brain, and depresses the breathing center. This causes hypoxia to all tissues including the heart. The hypoxia also causes acidosis from anaerobic respiration, and vasodilatation and drop in bp. This all lead to hypoxia of tissues including heart muscles, and eventual death of tissues. ...Read more
See Below: Usually, sedation is given - a 2mm incision is made in the femoral artery at the groin, a sheath is inserted, the artery is cannulated with a catheter, dye is injected via catheter to provide contrast so that the cardiologist can read the images via fluoroscopy (x-ray).The injection of dye is repeated to attain images of the heart from enough angles to provide a complete 'picture' of coronaries. ...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
Not: There's no direct effect.Get a more detailed answer ›
Heart rate: The normal range of resting heart rate is considered 60-100, but many people have lower heart rates than that and are in good health. Physical fitness like running, cycling, swimming often leads to lower hr and some people are normal even in the 40's range. If you have high bp, some meds lower the hr, such as beta blockers. ...Read more
Complex: Even though the mechanisms are complex, one way to understand is that if you lose the ability to filter your blood and eliminate extra fluid from your body (one of the kidney's main functions) your heart will be burdened with pumping a lot more blood than it was intended to do and will therefore fatigue and not pump as well (same as any other muscle would if forced to work "overtime"). ...Read moreSee 1 more doctor answer
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