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Aortic Valve & Aorta - PowerPoint PPT Presentation


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Aortic Valve & Aorta. Aortic Valve Area (AVA). Planimetry Planimetry is the tracing out of the opening of the aortic valve in a still image obtained during echocardiographic acquisition during ventricular systole Normal planimetry of the AoV should be 2.6-3.5cm2.

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Presentation Transcript
aortic valve area ava
Aortic Valve Area (AVA)
  • Planimetry
  • Planimetry is the tracing out of the opening of the aortic valve in a still image obtained during echocardiographic acquisition during ventricular systole
  • Normal planimetry of the AoV should be 2.6-3.5cm2
aortic valve area ava cont
Aortic Valve Area (AVA) cont.
  • The Gorlin equation
  • The Gorlin equation states that the aortic valve area is equal to the flow through the aortic valve during ventricular systole divided by the systolic pressure gradient across the valve times a constant. The flow across the aortic valve is calculated by taking the cardiac output (measured in liters/minute) and dividing it by the heart rate (to give output per cardiac cycle) and then dividing it by the systolic ejection period measured in seconds per beat (to give flow per ventricular contraction). (HEART CATHETERIZATION)
  • The Hakki equation
  • The Hakki equation[3] is a simplification of the Gorlin equation, relying on the observation that in most cases, the numerical value of . The resulting simplified formula is:
  • (HEART CATHETERIZATION)
aortic valve area ava1
Aortic Valve Area (AVA)
  • The continuity equation

AVA= LVOT (A) X LVOT (TVI) / AV (TVI) (SIMPLIFIED)

aortic root and aorta measurements
AORTIC ROOT AND AORTA MEASUREMENTS

LVOT diameter = 1.9 to 2.2 cm

Aortic Root Diameter 2.5 to 3.9 cm

ST Junction

Ascending Aorta

slide22

AI/ AR

  • AI diameter / LVOT diameter
  • % severity
  • <10% trace
  • < 25% mild
  • 25–32% mod.
  • 33% severe