title: Compression of the lungs by the heart in supine, side-lying, semi-prone positions.
abstract: [Purpose] Clarification of the differences in the compression volume of the lungs by the heart (CVLH) between postures may facilitate the selection of optimal postures in respiratory care. Determining CVLH in the supine, semi-prone (Sim's position), and side-lying positions was the aim of this study. [Subjects and Methods] Eight healthy volunteers (six males, two females; mean age, 29.0 ± 9.2 years) were enrolled in the study. Measurements were performed in the supine, right and left semi-prone, and right and left side-lying positions. semi-prone position was inclined 45° ventrally from the side-lying position. A 1.5-T system with a fast advanced spin-echo sequence in the coronal plane was used for magnetic resonance imaging. [Results] CVLH and heart compression ratio were significantly lower in the semi-prone position on both sides than the other positions. The heart was displaced ventrally when semi-prone and a larger area of the heart leaned on the ventral chest wall, localizing compression to part of the ventral region of the dependent lung. [Conclusion] The region of lungs compressed by the heart is reduced in the semi-prone position due to ventral displacement of the heart. These results suggest that maintaining expansion of the dependent lung is easier in the semi-prone position.
authors: Department of Physical Therapy, Faculty of Nursing and Rehabilitation, Konan Women's University, Japan.
authors: Kyoushi
authors: K
authors: Mase
authors: Department of Rehabilitation, Konan Hospital, Japan.
authors: Tisa
authors: T
authors: Noguchi
authors: Department of Physical Therapy, Uekusa Gakuen University, Japan.
authors: Miki
authors: M
authors: Tagami
authors: Department of Physical Therapy, Uekusa Gakuen University, Japan.
authors: Shigeyuki
authors: S
authors: Imura
authors: Department of Physical Therapy, Ibaraki Prefectural University of Health Sciences, Japan.
authors: Kazuhide
authors: K
authors: Tomita
authors: Department of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Japan.
authors: Masahiko
authors: M
authors: Monma
authors: Department of Physical Therapy, Faculty of Nursing and Rehabilitation, Konan Women's University, Japan.
authors: Masafumi
authors: M
authors: Nozoe
authors: Department of Physical Therapy, Faculty of Nursing and Rehabilitation, Konan Women's University, Japan.
authors: Sachie
authors: S
authors: Takashima
authors: Department of Physical Therapy, Faculty of Nursing and Rehabilitation, Konan Women's University, Japan.
authors: Kunihiro
authors: K
authors: Kawakatsu
keywords: Compression by heart; Lung volume; Semi-prone