Yamada N
Acta Med Okayama. 1985 Aug;39(4):297-313. doi: 10.18926/AMO/31492.
Vectorcardiograms were recorded with the Frank lead system using electrodes positioned at the level of the 5 th intercostal space with the subject in the supine position. Deep inspiration produced the following significant changes compared with deep expiration: (1) the maximum leftward forces of the P, QRS, and T vectors decreased, whereas the maximum anterior and posterior forces of the QRS and T vectors increased; (2) the maximum spatial QRS vector decreased in magnitude; (3) the maximum spatial P, QRS, and T vectors shifted vertically, posteriorly and vertically, and anteriorly, respectively; and (4) the spatial QRS-T angle increased remarkably. The spatial instantaneous QRS vectors were analyzed at 5 msec intervals in 35 of the 61 subjects. With inspiration, the 35- through 50-msec vectors shifted posteriorly with markedly reduced leftward forces and increased posterior forces. It was suggested that the respiration-related vectorcardiographic changes reflected cardiac anatomic positional change, distortion of lead-field potential by lung gases, and other mechanisms. Since the respiratory effect is potentially important for vectorcardiographic interpretation, vectorcardiograms should be recorded under identical respiratory status.
使用Frank导联系统，在受试者仰卧位时，将电极置于第5肋间水平记录向量心电图。与深呼气相比，深吸气产生了以下显著变化：(1)P、QRS和T向量的最大向左力减小，而QRS和T向量的最大向前和向后力增加；(2)最大空间QRS向量的大小减小；(3)最大空间P、QRS和T向量分别垂直向后、垂直向后和垂直向前移动；(4)空间QRS-T角显著增加。在61名受试者中的35名中，以5毫秒的间隔分析空间瞬时QRS向量。吸气时，35至50毫秒的向量向后移动，向左力明显减小，向后力增加。有人认为，与呼吸相关的向量心电图变化反映了心脏解剖位置的变化、肺气体对导联场电位的扭曲以及其他机制。由于呼吸效应对于向量心电图的解释可能很重要，因此应在相同的呼吸状态下记录向量心电图。
