[Doppler ultrasound determination of pressure decrease in model peripheral arterial stenoses].
In a pulsatile in vitro flow model with mounted concentric peripheral arterial stenoses, we compared the mean trans-stenotic pressure difference between pre- and poststenotic segment with the Doppler-estimated mean pressure gradient calculated according to the simplified Bernoulli equation applied over an entire stroke cycle. A close linear correlation was found between Doppler-estimated and invasively measured pressure drop values: Y = 1.13X + 0.47 (r = 0.98, SEE = 1.4 mmHg, n = 16). The Doppler-derived overestimation of the invasively measured mean pressure-drop by an average of 16% (absolute values 2.2 +/- 1.7 mmHg) suggests that in this in vitro model a small part of the kinetic energy of the stenotic jet is recovered distal to the poststenotic turbulences. The difference between both methods is so little that the Doppler-estimated mean pressure drop is acceptable in concentric peripheral model arterial stenoses.
Strauss
A L
AL
Medizinische Universitätsklinik, Kardiologie und Angiologie, WWU Münster.
Scheffler
A
A
Rieger
H
H
D001157:Arterial Occlusive Diseases / Q000503:physiopathology*; D001783:Blood Flow Velocity / Q000502:physiology; D001794:Blood Pressure / Q000502:physiology*; D006801:Humans; D008955:Models, Cardiovascular; D011673:Pulsatile Flow / Q000502:physiology; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation; D014463:Ultrasonography / Q000295:instrumentation*
Doppler-sonographische Bestimmung des Druckabfalls über peripheren Modell-Arterienstenosen.