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Phasic flow in the left ventricular inflow tract: The importance of Doppler sample volume position
Author(s) -
Delemarre Ben J.,
Bot Hans,
Visser Cees A.,
Dunning Arend J.
Publication year - 1988
Publication title -
journal of clinical ultrasound
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.272
H-Index - 61
eISSN - 1097-0096
pISSN - 0091-2751
DOI - 10.1002/jcu.1870160403
Subject(s) - medicine , inflow , doppler effect , cardiology , volume (thermodynamics) , position (finance) , flow (mathematics) , doppler echocardiography , doppler ultrasound , sample (material) , mechanics , diastole , blood pressure , physics , quantum mechanics , astronomy , chemistry , chromatography , finance , economics
Variability of Doppler transmitral flow was studied in 42 normal patients (aged 19–68 years). Starting at the mitral annulus level (ANL) in an apical four‐chamber view, the sample volume was moved downstream at 1‐cm intervals. At all positions, peak early (E) and late atrial mediated (A) diastolic velocity were measured, and the distance from the transducer to the level with the highest E wave (HEL) and highest A wave (HAL) determined. The A/E ratio and time velocity integral (TVI) at ANL, HAL, and HEL were also calculated. Peak E velocity at HEL was 33% higher than at ANL ( p < 0.01) and peak A velocity was 15% higher at HAL than at ANL ( p < 0.01). The A/E ratio was minimal at HEL and maximal at ANL (0.68 ± 0.28 vs 0.85 ± 0.32, p < 0.01), whereas TVI was highest at HEL and lowest at ANL. Thus, inflow parameters vary along the inflow axis. This is of importance for cardiac output measurement. The A/E ratio was more dependent on age than on sample volume position.