Mon25October0844PM 1

A 90-year-old woman sustains a fractured neck of femur following a fall. She is scheduled for urgent surgery.

The clinical history and examination suggests she may have heart failure and an echocardiogram is ordered.

The following measurements are available:

End-diastolic volume 40 ml (70-240)

End-systolic volume 30 ml (16-140)

Which one of the following figures approximates to her calculated ejection fraction?

(Please select 1 option)

65%

45%

55%

25% Correct

35%

Explanation

The ejection fraction (EF) is commonly measured using echocardiography.

A good estimate of end-diastolic (EDV) and end-systolic volumes (ESV) and stroke volume (SV = EDV - ESV) can be calculated using the following equation:

EF = SV/EDV × 100

Normally, EF is >55-70%.

In this example:

End-diastolic volume = 40 ml (normally 70-240 ml)

End-systolic volume = 30 ml (normally 16-140 ml)

SV = 40 - 30 = 10

EF = 10/40 × 100 = 25%.

Answer Statistics

1

1%

2

4%

3

1%

4

90%

5

6%

Times answered: 277