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Question 3
10 ?Points
Ejection fraction is Stroke volume divided by End diastolic volume. Your patient has exam results of: EDV =110 ????,ESV=60????,????=140118, ?and HR =86??????. ?What is your patient’s ejection fraction?
54%
60%
45.4%
36%
Question 4
10 ?Points
The correct answer and explanation is:
To calculate the ejection fraction (EF), you use the formula: EF=SVEDV×100EF = \frac{{SV}}{{EDV}} \times 100
Where:
- SV is stroke volume, which is the difference between the End Diastolic Volume (EDV) and End Systolic Volume (ESV).
SV=EDV−ESVSV = EDV – ESV
Given the values:
- EDV = 110 mL
- ESV = 60 mL
First, calculate the stroke volume: SV=110−60=50 mLSV = 110 – 60 = 50 \text{ mL}
Now, calculate the ejection fraction: EF=50110×100=45.45%EF = \frac{{50}}{{110}} \times 100 = 45.45\%
So, the correct answer is 45.4%.
Explanation:
Ejection fraction (EF) is an important measurement used in cardiology to assess the efficiency of the heart’s pumping ability. EF is the percentage of blood that is ejected from the heart with each beat, relative to the total volume of blood in the heart at the end of the filling phase (diastole). It is an indicator of the heart’s function.
- End Diastolic Volume (EDV) is the volume of blood in the ventricles just before the heart contracts.
- End Systolic Volume (ESV) is the volume of blood remaining in the ventricles after the heart contracts.
Stroke volume (SV) refers to the amount of blood pumped by the heart in one contraction. By dividing stroke volume by end diastolic volume, we get the ejection fraction, which reflects how much of the blood the heart pumps out relative to how much it receives.
An ejection fraction below 50% can indicate heart dysfunction, while values above 55% are considered normal, though this can vary depending on other health conditions. The ejection fraction is useful for diagnosing conditions like heart failure, where the heart’s pumping ability is compromised.