Underwood S R, Klipstein R H, Firmin D N, Fox K M, Poole-Wilson P A, Rees R S, Longmore D B
Br Heart J. 1986 Nov;56(5):455-62. doi: 10.1136/hrt.56.5.455.
Magnetic resonance imaging provides an accurate method for the measurement of left and right ventricular volume. The ratio of left ventricular stroke volume to right ventricular stroke volume was calculated from contiguous transverse magnetic resonance images and was used to measure the severity of regurgitation in 18 patients with aortic regurgitation and 10 with mitral regurgitation. Cardiac anatomy was well demonstrated, allowing an assessment of relative chamber volumes and associated abnormalities, although valve abnormality was not well seen. There was a weak correlation between magnetic resonance measurements of left ventricular end diastolic volume and stroke volume ratio. The stroke volume ratio differed significantly in four groups with increasing angiographic severity of regurgitation, and all but the group with trivial regurgitation differed significantly from normal. There was good correlation between magnetic resonance and radionuclide measurements of left ventricular ejection fraction and stroke volume ratio, although the stroke volume ratio was consistently overestimated by radionuclide ventriculography. Correlation was less good for the right ventricular ejection fraction, which was underestimated by radionuclide ventriculography. It is concluded that magnetic resonance imaging provides valuable information in patients with valvar regurgitation, and serves as a suitable standard by which to judge conventional techniques.
磁共振成像提供了一种测量左、右心室容积的准确方法。左心室每搏量与右心室每搏量的比值由连续的横向磁共振图像计算得出，并用于测量18例主动脉瓣反流患者和10例二尖瓣反流患者的反流严重程度。心脏解剖结构显示良好，尽管瓣膜异常显示不佳，但仍可对相对心室容积和相关异常进行评估。左心室舒张末期容积与每搏量比值的磁共振测量结果之间存在微弱相关性。随着血管造影显示的反流严重程度增加，四组患者的每搏量比值差异显著，除轻度反流组外，所有组与正常组均有显著差异。左心室射血分数和每搏量比值的磁共振测量结果与放射性核素测量结果之间存在良好相关性，尽管放射性核素心室造影一直高估了每搏量比值。右心室射血分数的相关性较差，放射性核素心室造影低估了右心室射血分数。结论是，磁共振成像为瓣膜反流患者提供了有价值的信息，并可作为判断传统技术的合适标准。
