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446 Achtergrondinformatie metingen
Qp/Qs
Oh, J.K., J.B. Seward, A. J. Tajik. The Echo Manual . 3rd ed., Philadelphia: Lippincott, Williams, and Wilkins,
(2007), p.70-72.
Qp/Qs = SV Qp-locatie/SV Qs-locatie = RVOT SV/LVOT SV
waarbij: RVOT SV = RVOT CSA * RVOT VTI = π/4 * RVOT-diameter
2
* RVOT VTI
LVOT SV = LVOT CSA * LVOT VTI = π/4 * LVOT-diameter
2
* LVOT VTI
Terugstromingsfractie (RF) als percentage
Oh, J.K., J.B. Seward, A. J. Tajik. The Echo Manual . 3rd ed., Philadelphia: Lippincott, Williams, and Wilkins,
(2007), p.215-217.
RF = RV/ MV SV
waarbij: RV = terugstromingsvolume
MV SV = slagvolume mitralisklep (Mitralis CSA * Mitralis VTI)
Mitralis CSA = oppervlak van de dwarsdoorsnede berekend met behulp van de diameter van
de annulus
Terugstromingsvolume (RV) in cc
Oh, J.K., J.B. Seward, A. J. Tajik. The Echo Manual . 3rd ed., Lippincott, Williams, and Wilkins, (2007),
p.215-217.
RV = ERO * MR VTI/100
Volume rechteratrium
Lang, R., M. Bierig, R. Devereux, et al. “Recommendations for chamber quantification: a report from the
American Society of Echocardiography’s guidelines and 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.” J
ournal of the American Society of Echocardiograph. 2005,
18: p.1440-1463.
RA Vol = π/4 *
Σ(
ai) * ai * L/20 voor i = 1 tot 20 (aantal segmenten)
waarbij: RA Vol = volume rechteratrium in ml
a = diameter van kamerweergave van doorsnede i
L = lengte van kamerweergave