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Anatomical effect of lateral decubitus position on circulation and heart rate variability in healthy adults
Author(s) -
Sasaki Konosuke,
Haga Mayu,
Matsui Noriko,
Nagai Mizuki,
Maruyama Ryoko
Publication year - 2012
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.26.1_supplement.864.7
Subject(s) - supine position , medicine , circulatory system , heart rate , position (finance) , inferior vena cava , sitting , cardiology , heart rate variability , hemodynamics , prone position , horizontal position representation , anatomy , blood pressure , anesthesia , finance , pathology , economics , geometry , mathematics
We compared the impact of the right and left lateral decubitus positions and the supine position on heart rate variability (HRV), including circulatory regulation. In 39 healthy volunteers aged 23.6 ± 3.3 years, we performed electrocardiographic measurements. Further, we conducted echocardiographic assessment of the inferior vena cava (IVC) in each posture. A male patient with situs inversus totalis (63 years) also participated in this study. Subjects randomly maintained each lateral position at an angle of over 45° for 10 min after remaining in the supine position. Of the subjects, 20 were initially turned to the left lateral position from the supine position, whereas the others were initially turned to the right lateral position. No significant differences were observed in high‐frequency or low frequency HRV or their ratio. However, the heart rate (HR) was significantly lower in the left lateral position than in the supine position and blood in the IVC tended to flow more rapidly in the left lateral position than in the supine position. Interestingly, the temporal changes in HR varied according to the order of postural change. Unlike the subjects, the patient showed a decrease in HR in the right lateral position. These findings suggest that the order of postural change has an influence on circulatory dynamics. In particular, the reduction in HR in the left lateral position may be affected by anatomical changes.