BACKGROUND: Cross-sectional flow-velocity profiles from early mitral flow in 20 patients (10 with mitral regurgitation and 10 with mitral stenosis) were constructed from the velocity data from each point in sequentially delayed two-dimensional digital Doppler ultrasound maps. METHODS AND RESULTS: The data suggested that the early mitral flow studied in an apical four-chamber view was variably skewed in both patient groups. The maximum flow velocity overestimated the cross-sectional mean velocity at the same time by a factor of 1.12-1.86. The maximum time-velocity integral was 1.13-1.77-fold greater than the cross-sectional mean time-velocity integral. In patients with mitral regurgitation, the cross-sectional flow-velocity profile appeared to be most skewed at the level of the mitral leaflet tips. The level of the mitral annulus appeared to give the most homogenous flow-velocity distribution in both patient groups. CONCLUSIONS: When calculations of volume flow are based on pulsed Doppler ultrasound recordings with a single sample volume, the possibility of a skewed flow-velocity profile must be taken into account.
BACKGROUND: Cross-sectional flow-velocity profiles from early mitral flow in 20 patients (10 with mitral regurgitation and 10 with mitral stenosis) were constructed from the velocity data from each point in sequentially delayed two-dimensional digital Doppler ultrasound maps. METHODS AND RESULTS: The data suggested that the early mitral flow studied in an apical four-chamber view was variably skewed in both patient groups. The maximum flow velocity overestimated the cross-sectional mean velocity at the same time by a factor of 1.12-1.86. The maximum time-velocity integral was 1.13-1.77-fold greater than the cross-sectional mean time-velocity integral. In patients with mitral regurgitation, the cross-sectional flow-velocity profile appeared to be most skewed at the level of the mitral leaflet tips. The level of the mitral annulus appeared to give the most homogenous flow-velocity distribution in both patient groups. CONCLUSIONS: When calculations of volume flow are based on pulsed Doppler ultrasound recordings with a single sample volume, the possibility of a skewed flow-velocity profile must be taken into account.
Authors: Rong Chen; Lisong Shi; Jörg Hakenberg; Brian Naughton; Pamela Sklar; Jianguo Zhang; Hanlin Zhou; Lifeng Tian; Om Prakash; Mathieu Lemire; Patrick Sleiman; Wei-Yi Cheng; Wanting Chen; Hardik Shah; Yulan Shen; Menachem Fromer; Larsson Omberg; Matthew A Deardorff; Elaine Zackai; Jason R Bobe; Elissa Levin; Thomas J Hudson; Leif Groop; Jun Wang; Hakon Hakonarson; Anne Wojcicki; George A Diaz; Lisa Edelmann; Eric E Schadt; Stephen H Friend Journal: Nat Biotechnol Date: 2016-04-11 Impact factor: 54.908
Authors: F Feillet; G Steinmann; C Vianey-Saban; C de Chillou; N Sadoul; E Lefebvre; M Vidailhet; P E Bollaert Journal: Intensive Care Med Date: 2003-08-01 Impact factor: 17.440