You are currently examining Reggie
Let’s perform an ultrasound of Reggie’s heart
and measure the size of his left atrium and left ventricle to determine whether he has cardiomegaly as a result of his MVD
Right parasternal short axis view
(left atrium and aortic valve)
Measure the internal short axis diameter of the aorta
Tap the middle of the right coronary aortic valve cusp and the opposite commissure between the non coronary and left coronary aortic valve cusps.
Try again, select the middle of the right coronary aortic valve cusp and the opposite commissure between the non coronary and left coronary aortic valve cusps
Now, select the opposite commissure between the non coronary and left coronary aortic valve cusps
Now, select the left atrial free wall and form a line that extends from the aortic diameter measurement
Try again
Select the commissure between the non coronary and left coronary aortic valve cusps, and the left atrial free wall.
LA measurement = 4.1 cm
Ao measurement = 1.9 cm
The start point should be from the middle of the right coronary aortic valve cusp.
The endpoint should be between the non-coronary and the left coronary valve cusps.
The start point should be between the non coronary and the left coronary aortic valve cusps.
The endpoint should be on the left atrial free wall. If a pulmonary vein is seen then the atrial wall should be extrapolated and the measurement taken to the perceived location of the wall.
| NC = non coronary aortic valve cusp | LA = left atrium |
| LC = left coronary aortic valve cusp | PV = pulmonary vein |
| RC = right coronary aortic valve cusp |
Reggie has a LA:Ao of 2.2
Left atrial enlargement is present.
| LA:Ao ≥1.6 | Left atrial enlargement present |
| LA:Ao <1.6 | Left atrial enlargement not present |
LVIDDN = normalised left ventricular internal diameter in diastole
How to measure the left atrial to aortic ratio (LA:Ao)
- RCVS Specialist in Veterinary Cardiology, HeartVets
You do not have to measure the LVIDDN
As Reggie has a LA:Ao ratio of ≥1.6, cardiomegaly has already been confirmed. This means measuring the left ventricular internal diameter at end-diastole normalised for bodyweight (LVIDDN) is not necessary. However, you can proceed if you choose.
Measure LVIDDN Finish ultrasoundYou should measure the LVIDDN
As Reggie has a LA:Ao of <1.6, the size of the left ventricle should be obtained by measuring the left ventricular internal diameter at end-diastole normalised for bodyweight (LVIDDN).
Measure LVIDDNGood choice
As Reggie has a LA:Ao of <1.6, the size of the left ventricle should be obtained by measuring the left ventricular internal diameter at end-diastole normalised for bodyweight (LVIDDN).
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