FujiFilm SonoSite Edge II User Manual page 133

Isovolumic Relaxation Time (IVRT) in msec
Oh, J.K., J.B. Seward, A.J. Tajik. The Echo Manual. 3rd ed., Philadelphia: Lippincott, Williams, and Wilkins,
(2007), p.123-124.
[time a - time b]
where:
time a = mitral valve opening
time b = aortic valve closure
IVC Percentage Collapse
Lyon, M., N. Verma. "Ultrasound guided volume assessment using inferior vena cava diameter." The Open
Emergency Medicine Journal. 2010, 3: p.22-24.
(IVCd exp – IVCd insp)/IVCd exp
where:
expiration (exp) = maximum diameter (Max D)
inspiration (insp) = minimum diameter (Min D)
Left Atrium/Aorta (LA/Ao)
Feigenbaum, H. Echocardiography. Philadelphia: Lea and Febiger, (1994), p.206, Figure 4-49.
Left Atrial Area
Lopez, L. et al. "Recommendations for quantification methods during the performance of a pediatric
echocardiogram: A report from the pediatric measurements writing group of the American Society of
Echocardiography pediatric and congenital heart disease council."Journal of the American Society of
Echocardiograph. 2010, 23: p.465-495.
Left Atrial Volume
Lang R. et al. "Recommendations for Cardiac Chamber Quantification: A report from the American Society
of Echocardiography's Guidelinesand Standards Committee and the Chamber Quantification Writing
Group, Developed in Conjunction with the European Association of Echocardiography, a Branch of the
European Society of Cardiology." Journal of the American Society of Echocardiography. (2005), 18:
p.1440-1463.
Lang, R. et al. "Recommendations for Cardiac Chamber quantification by Echocardiography in Adults: An
update from the American Society of Echocardiography and European Association of Cardiovascular
Imaging." Journal of the American Society of Echocardiograph. January (2015), 28: p.1-39.
LA Vol = p/4(h) (D1)(D2)
where:
LA Vol = Left Atrial Volume in ml
h = Height of stacked oval disks making up the LA
D1 = Orthogonal minor axis
D2 = Orthogonal major axis
Measurement references 6-7