Second derivative of photoplethysmogram in children and young people

Citation
Y. Iketani et al., Second derivative of photoplethysmogram in children and young people, JPN CIRC J, 64(2), 2000, pp. 110-116
Citations number
18
Categorie Soggetti
Cardiovascular & Respiratory Systems","Cardiovascular & Hematology Research
Journal title
JAPANESE CIRCULATION JOURNAL-ENGLISH EDITION
ISSN journal
00471828 → ACNP
Volume
64
Issue
2
Year of publication
2000
Pages
110 - 116
Database
ISI
SICI code
0047-1828(200002)64:2<110:SDOPIC>2.0.ZU;2-I
Abstract
The characteristics of the second derivative of the photoplethysmogram (SDP TG) were clarified in children and young people, and the factors affecting the SDPTG wave pattern were examined. The study group comprised 775 healthy subjects aged 3-20 years (mean, 10+/-5). The blood pressure of the left br achial artery was determined in the resting sitting position and then the f ingertip PTG and the SDPTG were automatically measured using a digital phot oplethysmograph, with the sensor located at the cuticle of the second digit of the right hand. The values used were the b/a, c/a, d/a, and e/a ratios, and the SDPTG aging index (SDPTG-AI). With increasing age, the systolic bl ood pressure and height increased (r=0.52, 0.92). Aging decreased the b/a r atio and SDPTG-AI (r=-0.58, -0.67) and increased the c/a and e/a ratios (r= 0.42 and 0.42). There was no significant correlation between blood pressure and indices of SDPTG. As height increased, the b/a ratio and SDPTG-AI decr eased (r=-0.57, -0.71), whereas the c/a and e/a ratios increased (r=0.42 an d 0.46). In males the SDPTG-AI decreased with age from 3 to 18 years and th en increased, and in females it decreased with age from 3 to 15 years and t hen increased. Overall, the SDPTG-AI decreased with age between 3 and 18 ye ars and then increased, forming a J curve. In the children's and young peop le's SDPTG, the b/a and SDPTG-AI decreased and the c/a and e/a ratios incre ased with age. The length of the vascular system and the inner diameter and wall thickness of vessels may modify the SDPTG wave pattern in the growth period. Thereafter, as the effects of these factors decrease, the increase in intravascular pressure and decreasing wall elasticity due to aging may a ffect the wave pattern.