Gilles R, Jadot F, Delage B, Fleury G, Le Pailleur C, Vacheron A, Di Mattéo J
Arch Mal Coeur Vaiss. 1977 Aug;70(8):809-18.
External phonomechanographic methods allow us to obtain a fairly precise estimate of the degree of obstruction to the pulmonary outflow, whether such an obstruction is a single entity or associated with another intracardiac malformation. The greatest precision in this field is obtained with the cases of pure pulmonary stenosis. The findings on phonomechanographic investigation of 54 cases with pulmonary stenosis have been compared with the results of the haemodynamic tests (catheterisation and angiography) as well as with the anatomical findings after a surgical cure had been effected in a certain number of cases. This study has allowed us to pick out five phonomechanographic criteria of severity of pulmonary stenosis: an increased reduplication of the second sound, lenghening of the interval between the Q wave of the electrocardiogram and the maximum portion of the systolic murmur, an increase in Furuta's ratio and also in the amplitude of the jugular venous a-wave as a function of the total height t (the a/t ratio), but most especially the "corrected" Furuta ratio as a function of the length of the ejection phase of the right ventricle, as this has been shown to possess the best correlation with the right ventricular systolic pressures.
外部呼吸机械记录法使我们能够相当精确地估计肺流出道梗阻的程度，无论这种梗阻是单一情况还是与其他心内畸形相关。在纯肺动脉狭窄的病例中，该领域能获得最高的精确度。对54例肺动脉狭窄病例的呼吸机械记录研究结果，已与血流动力学检查（心导管检查和血管造影）结果以及部分病例手术治愈后的解剖学发现进行了比较。这项研究使我们能够找出肺动脉狭窄严重程度的五个呼吸机械记录标准：第二心音重复增强、心电图Q波与收缩期杂音最大部分之间的间期延长、古田比值增加以及颈静脉a波幅度随总高度t增加（a/t比值），但最主要的是“校正后”古田比值随右心室射血期长度的变化，因为已证明它与右心室收缩压具有最佳相关性。
