Fujimoto S, Mohiaddin R H, Parker K H, Gibson D G
Cardiac Department, Royal Brompton Hospital, London, UK.
Heart Vessels. 1995;10(5):236-40. doi: 10.1007/BF01744902.
We used magnetic resonance imaging (MRI) velocity mapping to assess the velocity profile of early diastolic mitral inflow in 11 normal subjects. Velocity maps of left ventricular inflow were obtained in the horizontal long axis of the left ventricle at the time of peak early diastolic filling. Velocity profile curves across the mitral inflow were obtained at 1-cm intervals from the mitral ring to 4 cm into the cavity. The jet width was 3.06 +/- 0.64 cm at the mitral ring level, increasing to 3.6 +/- 0.61 cm at 4 cm. The peak/mean velocity was 1.2 +/- 0.07 at the mitral ring and increased to around 1.4 at 3-4 cm from the mitral ring. The point at which the peak velocity was recorded at each level was skewed towards the septal side by 10%-13% of jet width from the center at the mitral ring and 2-4 cm from the ring. However, at a depth of 1 cm, corresponding to the mitral tip level, the peak velocity was at the center of the jet. The ratio of vertical and horizontal dimensions of the jet cross section was 1.11 +/- 0.05. Thus, the mitral inflow velocity profile is relatively flat at the mitral ring and tip level; the inflow jet cross section is effectively circular.
我们使用磁共振成像（MRI）速度映射来评估11名正常受试者舒张早期二尖瓣流入的速度剖面。在舒张早期充盈峰值时，于左心室水平长轴获取左心室流入速度图。从二尖瓣环至心腔内4厘米处，以1厘米间隔获取二尖瓣流入的速度剖面曲线。二尖瓣环水平处的射流宽度为3.06±0.64厘米，在4厘米处增至3.6±0.61厘米。二尖瓣环处的峰值/平均速度为1.2±0.07，从二尖瓣环3 - 4厘米处增至约1.4。在每个水平记录峰值速度的点，在二尖瓣环处偏离中心向间隔侧偏移射流宽度的10% - 13%，在距环2 - 4厘米处偏移2 - 4厘米。然而，在相当于二尖瓣尖水平的1厘米深度处，峰值速度位于射流中心。射流横截面的垂直与水平尺寸之比为1.11±0.05。因此，二尖瓣流入速度剖面在二尖瓣环和尖水平相对平坦；流入射流横截面实际上为圆形。
