Referenser för mätningar
Aortaklaffens area (AVA) enligt kontinuitetsekvationen i cm
Oh, J. K., J. B. Seward, and A. J. Tajik. The Echo Manual. 3rd Edition., Philadelphia: Lippincott, Williams, and
Wilkins, (2007), p.73, 191-195.
A
= A
* V
/V
2
1
1
2
där:
A
= aortaklaffens area
2
A
= LVOT-area (CSA)
1
V
= LVOT-hastighet (VMax)
1
V
= aortaklaffens hastighet (VMax)
2
LVOT = Left Ventricular Outflow Tract (vänster kammares utflödesområde)
Tryckgradient (PGr) i mmHg
Oh, J. K., J. B. Seward, and A. J. Tajik. The Echo Manual. 3rd Edition, Philadelphia: Lippincott, Williams, and
Wilkins, (2007), p.63-66.
2
PGr = 4 * (hastighet)
Max tryckgradient E (E PG)
2
E PG = 4 * PE
Max tryckgradient A (A PG)
2
A PG = 4 * PA
Max tryckgradient (PGmax)
2
PGmax = 4 * PV
Medeltryckgradient (PGmean)
Echocardiographic Assessment of Valve Stenosis: EAE/ASE Recommendations for Clinical Practice Journal
of American Society of Echocardiography, (January, 2009), 4-5.
2
PG-medel = sum(4v
)/N
där:
v = topphastighet under intervall n
N = antalet intervaller i Riemann-summan
Qp/Qs
Oh, J. K., J. B. Seward, and A. J. Tajik. The Echo Manual. 3rd Edition, Boston: Philadelphia: Lippincott Williams
and Wilkins, (2007), p.70-72.
Referenser för mätningar
2
201