Calculating heart stroke volume

Common Questions and Answers about Calculating heart stroke volume


Avatar n tn You can't measure stroke volume with the heart rate. Stroke volume is the amount of blood that your left ventricle pumps out with each heart beat. If you multiply the stroke volume by the heart rate you get your cardiac output.
Avatar n tn _ Dear Pat, thank you for your question. The formula for stroke volume is cardiac output (in cc's/min) / heart rate (per min). The normal range for stroke volume is 50-70 cc's and doesn't vary much with age. Stroke volume refers to the amount of blood ejected from the heart with each heartbeat. The only way to directly measure stroke volume is through a cardiac catheterization where the cardiac output can be directly measured with a catheter in the heart.
Avatar m tn CO is a product of blood volume per heart stroke and heart rate. The higher/better the stroke volume (weak, strong, stronger contractions) the fewer heart beats (more for weak, less for strong, least for stronger) are required to meet demand (held constant for illustration) for blood oxygen. A well-condition individual requires fewer heartbeats due to strong contractions. It is the stroke that determines EF...not the CO, as CO can vary by an increase or decrease of HR.
Avatar m tn This happens by a system of vasodilation and vasoconstriction coupled with the pumping rate and stroke volume of the heart. Rather than make frequent changes in volume, the body changes the configuration of the total container (all the vessels) and increases the speed at which the resource is renewed.
Avatar n tn Stroke volume is a calculation to determine ejection fraction (EF)...the amount of blood pumped into circulation with each heartbeat. The calulation for EF is volume of blood in the left ventricle at systole (pumping) phase. Subtract the volume left in the ventricle after diastolic (filling) phase. Then divide the volume of blood during systole for a fraction...that would be EF. Your EF idicates you have a normal pumping heart. Normal is 50 to 70%.
1124887 tn?1313754891 EF is a compensating factor and helps maintain a balancing flow of blood between the right and left side of the heart. Stroke volume is inverse to the heart rate. Slow heart rate the greater the stroke volume which indicates the heart rate is also a compensating factor...the slower the heart rate the more time to fill. Wide pulse pressure (no medication, etc) can be the outcome of increased CO due to fitness, anxiety, hyperthyroidism, etc.
Avatar n tn i had a echocardiogam which shows that my stroke volume is 47 ml is it a normal value or it is a sign of heart failure.all other things are normal in my echo. my ejection fraction is 61.4%.
Avatar m tn Is the reason my diastolic volume is lower because I cannot maintain my stroke volume if my heart weighed more (from more diastolic blood volume)? Could this be the body’s way of protecting itself, where it knows it can only produce a stroke volume in the normal range of 55-100 if the heart has a lower preload to begin with?
Avatar m tn the same MAP regardless of if heart rate is 100 and stroke volume 100 ml, or the heart rate is 50 and stroke volume 200 ml, the same is not true for pulse pressure (sys minus dia). While the first might have a blood pressure of 140/90 and a MAP of 105 mmHg, the latter may have a blood pressure of 180/70 and the same MAP. Everyone have their unique stroke volume:pulse pressure ratio, depending on arterial compliance/stiffness. In general, a lower number may indicate higher arterial stiffness.
Avatar m tn Over many, many years, with high blood pressure and being very overweight, the inside of your ventrical gets thicker, and the volume inside therefore decreases, decreasing stroke volume and causing your heart rate to become higher and your heart then has to work harder to pump the same amount of blood, which over many years causes the ventricular walls to stiffen. I hope that clarifies some of it.
Avatar n tn I'm just telling you what a Cardiologist told me. If you are very nervous/extreme anxiety, your breathing for example when extremely nervous can influence the result of your echo. I had to have several tests done after I had an EKG which showed a previous heart attack which I never had tests later proved that. One of the tests was an echocardiogram. I had high anxiety during the test wondering how much my heart was damaged from this "previous heart attack".
1591333 tn?1297733419 The left venticle will dilate to increase blood flow with each stroke and the heart rate will increase the cardiac output (amount of blood pumped per minute). If the system is dysfunctional, medication, etc. can change the dynamics. For instance heart failure increases blood volume and the kidneys react as if the individual is losing blood...the increase of volume further distresses the heart and kidneys continue to believe the system is losing blood.
Avatar m tn The volume of blood left in a ventricle at the end of contraction is end-systolic volume. The difference between end-diastolic and end-systolic volumes is the stroke volume, the volume of blood ejected with each beat. Ejection fraction (Ef) is the fraction of the end-diastolic volume that is ejected with each beat; it is stroke volume divided by end-diastolic volume. Normal in a man is 50-68%.
Avatar n tn Posted By Pat on August 20, 1998 at 09:43:30: I had a cardiopulmonary exercise stress test and went back for the results, I had gotten info from you re the VO2max numbers so I could try to understand what the doctor would tell me, instead the doctor said they measured the stroke volume and mine was "16" which he thought was low, what does this 16 mean, what would an average number be for a 55 year old female?
Avatar f tn Your cardiac output is your stroke volume times your heart rate. If your stroke volume is very high, but your heart rate is too low, your CO will still be too low for your body. This has to be checked by a doctor. Let us know how it goes.
Avatar m tn For a perspective, diastole dysfunction compromises left ventricle filling volume, inadequate stroke volume and operating at a high pressure regimen. LV filling volume is reduced due to increased wall size crowding out available space. Inadequate stroke volume is usually due to wall thickening and stiffening and loss of elasticity. High pressures can dilate upper chamber to compensate for gradient pressure across the mitral valve. That is the pathology.
Avatar m tn A faster heartbeat does not provide enough time to fill as at rest, and the timing of contractions are less. The percent of blood pumped with each heartbeat is less reducing stroke volume (lower EF). The heart rate has increased to provide the necessary blood/oxygen to meet the system's demand for the diminished stroke volume. The CT scan indicates there is substanital soft plaque buildup within the linings of the vessels.
Avatar f tn To maintain adequate blood flow with a decrease in stroke volume is to increase the heart rate. The math for cardiac output is stroke volume times heart rate for one minute. Frankly, I don't believe you have significant MVR because you should also have the symptoms of shortness of breath with exertion and muscle fatigue.
Avatar m tn An echo calculates heart chamber diminsions and volume of blood pumped with each stroke. The math equation is diastole volume (peak filling) minus systole (volume after pumping) divided by diastole for the percentage. You can calculate your fraction shortening (FS) which is similar to EF but relies on dimensions rather than volume. To calculate subtract systole dimension from diastole dimension and divide by diastole for percentage. FS is an estimate of myocardial contractility.