Raines R A, LeWinter M M, Covell J W
Am J Physiol. 1976 Nov;231(5 Pt. 1):1395-1400. doi: 10.1152/ajplegacy.1976.231.5.1395.
The right ventricular outflow tract (OT) is a functionally distinct area of the right ventricle. However, there is little information on the contrdingly, inflow tract (IT) and OT chords and right ventricular free wall segmental changes were measured with implanted ultrasound crystals. The timing and extent of shortening of IT and OT chords and free wall segments were determined both at rest and after stellate ganglion stimulation. At rest, IT chord shortening began 51 ms before OT shortening. OT expansion occurred during this period. IT chord shortening began 51 ms before OT shortening. OT expansion occurred during this period. IT chord shortening was 38% while OT shortening was 34%. In contrast, OT segments did not show systolic expansion. IT segment shortening was 13% while OT shortening was 21%. With stellate stimulation, IT-OT gradients of 15-25 mmHg developed. The lag between IT and OT shortening decreased to 30 ms and segmental shortening increased. We conclude that the OT is a physiologically distinct region which contracts later and remains contracted longer than the IT. Both septal and free wall movements contribute to these changes.
右心室流出道（OT）是右心室功能上独特的区域。然而，关于流入道（IT）的信息却很少。相反，通过植入超声晶体测量了IT和OT腱索以及右心室游离壁节段的变化。在静息状态和星状神经节刺激后，确定了IT和OT腱索以及游离壁节段缩短的时间和程度。静息时，IT腱索缩短比OT缩短早51毫秒开始。在此期间OT发生扩张。IT腱索缩短比OT缩短早51毫秒开始。在此期间OT发生扩张。IT腱索缩短为38%，而OT缩短为34%。相比之下，OT节段未显示收缩期扩张。IT节段缩短为13%，而OT缩短为21%。星状神经节刺激后，IT与OT之间形成15 - 25 mmHg的压力梯度。IT与OT缩短之间的延迟减少至30毫秒，节段缩短增加。我们得出结论，OT是一个生理上独特的区域，其收缩比IT晚且收缩持续时间更长。间隔和游离壁的运动均促成了这些变化。
