Fluss = PISA * Va
wobei:
PISA = Proximal Isovelocity Surface Area
Va = Aliasing-Geschwindigkeit
Druckgradient (PGr) in mmHg
Oh, J.K., J.B. Seward, and A.J. Tajik. The Echo Manual. 3rd Edition, Philadelphia: Lippincott, Williams, and Wilkins,
(2007), 63-66.
PGr = 4 * (Geschwindigkeit)
Spitzendruckgradient E (E PG)
2
E PG = 4 * PE
Spitzendruckgradient A (A PG)
2
A PG = 4 * PA
Spitzendruckgradient (PGmax)
2
PGmax = 4 * PV
Mittlerer Druckgradient (PGmean)
Echocardiographic Assessment of Valve Stenosis: EAE/ASE Recommendations for Clinical Practice Journal of
American Society of Echocardiography, (January, 2009), 4-5.
Druckgradient (PG) Mittelwert = sum (4v
Wobei:
v = Spitzengeschwindigkeit im Intervall n
N = Anzahl der Intervalle in der Riemann-Summe.
Druckhalbwertszeit (PHT) in ms
Oh, J.K., J.B. Seward, A.J. Tajik. The Echo Manual. 3rd ed., Philadelphia: Lippincott, Williams, and Wilkins, (2007),
73-74.
PHT = DT * 0,29
wobei:
DT = Verzögerungszeit
SonoSite Edge II-Ultraschallsystem
2
2
)/N
19