Case 38

Pulsed wave Doppler flow velocity across the defect

Pulsed wave Doppler flow velocity across the defect

Continuous wave Doppler aortic peak flow velocity

Continuous wave Doppler aortic peak flow velocity    Aortic measurement

Continuous wave Doppler pulmonic peak flow velocity

Continuous wave Doppler pulmonic peak flow velocity    Pulmonic artery measurement

Quiz

1. The diameter of this dog's pulmonic valve/artery region (bottom right image) is 2.26 cm. What is the radius?

2. What is the approximate surface area of the pulmonic valve region?

3. The velocity-time integral (VTI) of the pulmonic flow is .24 meters or 24 cm. How many cubic centimeters (cc or ml) goes through this region with each beat?

4. Using the same calculations you can determine that stroke volume (volume ejected with each beat) is approximately 45 ml/beat through the aortic valve region. What is the approximate ratio of pulmonic valve flow to aortic valve flow (Qp/Qs)?

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