Doctor insights on:
What Is The Percentage Of Cardiac Output Delivered To The Heart
What happens to cardiac output and after load when when heart rate is low? Does it increase because high heart rate causes decrease in CO
What to do if a transplanted heart has no nerve supply, how does the cardiac output of a transplanted heart increase and adapt to physiological changes?
Hormonal +/- nervous: The transplanted heart responds to hormonal changes. There is also some evidence that the transplanted heart may have some sympathetic re-innervation and possibly conduction of signals from the old sinus node to the new heart. ...Read more
Echocardiography: There are other modalities that can calculate "heart strength" (how well is the heart pumping blood) and cardiac output (how many liters of blood are pumped per minute) but the most accessible and non-invasive is an echo. By measuring the heart when full of blood and then when fully contracted you can estimate the effectiveness of the "squeeze" as well as the volume pumped. ...Read more
I was wondering what would the cardiac output of a patient be, if his heart was beating 80 times per minute while pumping 70 m?
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
What are the signs and symptoms of left sided heart failure associated with decreased cardiac output?
Swelling: The left side of the heart pumps blood throughout your body. When it fails, it decreases blood flow to organs. This can cause kidney injury, liver injury, fatigue, shortness of breath with little exertion, swelling of the feet and legs, fluid build-up in the lungs, and difficulty sleeping flat due to shortness of breath. Medications and diet are important for this disease! ...Read more
What are the signs and symptoms of left sided heart failure due associated with decreased cardiac output?
Congestion: Breathlessness, especially with exertion. Easy fatigability. Impaired exercise capacity. These are early signs. Without treatment, one becomes short of breath resting, especially when lying down (orthopnea) and at night (paroxysmal nocturnal dyspnea). Eventually the right heart also fails leading to swelling (edema), abdominal fluid (ascites and effusions), and cachexia (wasting). ...Read more
Can congenital heart defects or certain drugs result in increased cardiac output? What else causes it? Mine is 7.2lmin squared.
CO = HR x SV: Cardiac output (co) is the volume of blood pumped per minute, and related to heart rate (hr) and stroke volume (sv) (volume per heart beat). It can be affected by many bodily activities. An increase in either hr or sv can result in inceased co. So any drug that increases hr (caffeine, etc) can result in incresed co. Certain congenital heart defects (such as septal defects) can alter co. ...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
Can heart failure or low cardiac output be associated with protein deficiency and how to best recover? Bnp=300 & protein 5.8g/dl
Heart failure: Right sided hf can lead to swelling of intestines and then poor nutrient absorption. This can go along with abdominal bloating. If this is happening or if you have difficulty breathing with exercise, you need more water taken off. I like to use (lots of) Aldactone (spironolactone) for this. Also check to see if you are losing protein in your urine. ...Read more
Cardiac markers: Many markers are surrogates for heart disease, meaning, that their combination with other symptoms and risk factors increase the chances that heart disease is present. These are things like cholesterol testing, CRP, homocystein levels. . . etc. Markers of actually heart damage include troponin types, CPK and CK-MB levels. BNP and pro BNP can help diagnose heart failure. d/w cardiologist. ...Read more
Stress Hormones: Broken Heart syndrome or apical balooning as some call it results from severe stress like the loss of a loved one, during the episode which usually resolves in a wk time, the person may experience chest pain and shortness of breath, there is some disruption of the normal pumping functions of the heart. If chest pain and SOB continue, one needs to seek medical help ...Read more
Rest or max?: Resting heart rate is 50-80 in all adults, regardless of age. Maximum HR is 220 minus the age (for example, a 35 year old's max HR is roughly 185). All these figures are just rules of thumb and not precise. ...Read more
Takotsubo syndrome: The ventricular wall thins and balloons out - overall contractility (ejection fraction) falls. Many mechanisms have been proposed but the actual cause is not known. It is not due to blocked coronary arteries. ...Read more
Arrhythmia: If you previously had an arrhythmia and your Doctor prescribed medications to control the heart rate, the arrhythmia could be present despite normal heart rate range. There are other arrhythmias in which heart rate can be between 60-100 bpm. ...Read more
http://en. Wikipedia. Org/wiki/cardiac_marker.
What does it mean when a 72 year old man with a history of heart diease has a major cardiac event and has to be revived 3 times in less than an hour?
Cardiac arrest: It sounds as though he has had an event such as a myocardial infarction which can cause recurrent cardiac arrhythmias which are associated with loss of consciousness and are usually treated with defibrillation and intravenous drugs. This situation is best handled by a team which includes a cardiac electrophysiologist. ...Read more
Strctural heart dis: Sudden cardiac arrest is usually due to conduction disease or hypertrophic cardiomyopathy. Pete maravich died of coronary artery disease during a pick up game. It turns out he only had 1 coronary artery. It is the main reason athletes at all levels have preliminary cardiac clearence. ...Read more
Depends: Many variables. It depends on the cause, degree of enlargement/dilatation, overall function of the heart, etc. Enlargement of the heart should be evaluated by cardiologist. ...Read more
Many options: Asystole, ventricular fibrillation, ventricular tachycardia, torsades DES pointes, . The ventricles fail to provide significant arterial flow to the aorta and the pulmonary artery, the systemic arterial pressure drops below critical level leading to cerebral hypoperffusion and syncope. If prolongued brain death occurs within 5 minutes at normothermia. ...Read more
Heart: Every organ has physical parameters with a range of size considered normal. Borderline cardiac heart size means either at the upper or lower limits of the normal range for size of heart. This doesn't mean something is wrong it just defines where the size falls in the range. Could be normal size and abnormal function etc................ ...Read more
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