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Why Does A Patient In Renal Failure Have Decreased Cardiac Output
Not always related: Renal failure in and of itself is not realted to cardiac output, there are many things that can cause both renal failure and decreased cardiac output, but they are not always related. However if someone has really low cardiac output, one could develop renal failure b/c not enough blood is getting to the kidneys. ...Read moreSee 1 more doctor answer
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
Many reasons: Decreased cardiac output can contribute to reduced kidney function. Kidney disease is often associated with heart problems that reduce cardiac output. High blood pressure and volume overload with kidney failure can also reduce heart output. It's often difficult to sort out cause and effect in these situations. ...Read more
Direct vs. indirect: Kidney failure can weaken the heart muscle (uremic cardiomyopathy), but this is pretty rare. A more common problem is fluid accumulation around the heart (pericardial efffusion), which can literally choke the heart (tamponade) but improves with extra dialysis. Or, more likely, the conditions that caused the kidney disease (commonly hypertension and/or diabetes) also are causing heart problems. ...Read more
What does it mean if a patient with congestive heart failure has cyanosis coupled with liver and kidney failure?
What happens if a man has a cardiac reserve of 400% and maximum cardiac output is 20 l/min, what is his resting cardiac output?
Great question: Sounds about normal for average individuals, but low for highly trained athletes. Resting cardiac output generally around 5 liters/min and 400% is 4 x the resting output. Not sure how you tested this, but it sounds about right for an average, healthy individual. If you are a highly trained athlete, or if you have symptoms of fatigue or shortness of breath, you may want to speak to a physician. ...Read more
Can you tell me if a man has a cardiac reserve of 400% and maximum cardiac output is 20 l/min, what is his resting cardiac output?
5 lpm: 5 liters per minuteGet a more detailed answer ›
Hypovolemia: The reduced cardiac output is largely due to the dehydration and volume loss from the polyuria (increased urination), and often times nausea/vomiting. Cardiac output is determined by heart rate times stroke volume. The heart can only compensate so much by increasing the rate when you don't have the blood volume to pump. Eventually, a decreasing ph also prevents the heart from contracting as well. ...Read more
Sick muscle: The heart is supposed to pump out a certain amount with every heart beat, if that amount is too low, e.g. Low out put, the heart muscle is too weak to do it's job(failure). ...Read more
If left ejection fraction is maintained in diastolic heart failure, why is the cardiac output decreased?
Think stiffness: In diastolic dysfunction, the heart muscle tends to be stiff, so that it doesn't "relax" well and fill with blood. So even if the heart can pump blood forward OK, if it doesn't fill up appropriately, then it won't function optimally ... ...Read more
Incomplete therapy: In congestive heart failure, there is activation of the sympathetic nervous system, which is a contributor to tachycardia. The reflexes that lead to this are complex. Simplistically, though, this is a sign that you need additional therapy. Outcomes are best in people who are on beta-blockers, typically Carvedilol or metoprolol, which have the additional affect of slowing heart rate. ...Read moreSee 1 more doctor answer
This is only a general question. If an elderly pt has "kidney failure" & sepsis does the kidney failure generally make much of a difference to survivablity?
Kidney failure: Kidney failure complicates treatment of other serious illnesses. The extra metabolic demands created during serious illness can also make recovery more difficult in the face of organ failure. Experienced physicians should be able to manage this to some degree for the best possible outcome. ...Read more
What to do if I had seen a patient with underlying congestive cardiac failure presented with ventricular tachycardia.?
Patient: A patient like that should be seen by a cardiologist ...Read more
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