Question

question 31 (0.5 points)
sara has a cardiac stroke volume of 70 ml/ beat. a cardiac ultrasound measures her end diastolic volume to be 120 ml. which must be true?
saras end systolic volume 190 ml.
sara is in heart failure.
sara is having a heart attack.
saras end systolic volume is 50 ml.

Explanation:

Step1: Recall the formula for stroke volume

The formula for stroke volume (\(SV\)) is \(SV = EDV - ESV\), where \(EDV\) is end - diastolic volume and \(ESV\) is end - systolic volume.

Step2: Rearrange the formula to solve for \(ESV\)

We can rearrange the formula \(SV=EDV - ESV\) to \(ESV=EDV - SV\).

Step3: Substitute the given values

We know that \(SV = 70\space ml/beat\) and \(EDV = 120\space ml\). Substituting these values into the formula for \(ESV\), we get \(ESV=120 - 70=50\space ml\).

Now let's analyze the other options:

• For the option "Sara's end systolic volume 190 ml", using the formula \(ESV = EDV - SV\), \(120 - 70

eq190\), so this is incorrect.

• The options "Sara is in heart failure" and "Sara is having a heart attack" cannot be concluded from just the values of stroke volume and end - diastolic volume. We need more clinical information to diagnose heart failure or a heart attack.

Answer:

Sara's end systolic volume is 50 ml.