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Spectral analysis of diaphragmatic EMG during the neonatal biphasic hypoxic ventilatory response


, : Spectral analysis of diaphragmatic EMG during the neonatal biphasic hypoxic ventilatory response. Pediatric Research 21(3): 238-241

The newborn infant monkey consistently demonstrates a biphasic ventilatory response to hypoxemia. We have previously shown that the ventilatory depression during the late portion of this biphasic response is secondary to a decline in inspiratory volume that cannot be explained solely by central neural depression. We hypothesized that hypoxemia caused the diaphragm to fatigue, thereby accounting for the late ventilatory depression during the biphasic neonatal hypoxic response. Diaphragmatic fatigue has been reported to be associated with a decrease in the centroid frequency (Fc) of the electromyogram derived through frequency spectral analysis. Therefore, we analyzed the power spectral density of the diaphragmatic electromyogram recorded from percutaneously implanted crural diaphragmatic electrodes in five 2-day-old infant monkeys while they breathed room air and after 5 min exposure to two levels of hypoxemia during the late ventilatory depression. A fast Fourier transform of EKG free diaphragmatic electromyogram was used to compute the power spectral density and the Fc. The Fc during room air breathing was statistically equivalent to the Fc observed after five minutes exposure to 12% FiO2 (p = 0.79), and 8% FiO2 (p = 0.74) when ventilation was falling. In conclusion, our data demonstrate that changes in the centroid frequency are not present during the biphasic ventilatory decline that occurs with the hypoxic ventilatory response in newborn monkeys. Thus, diaphragmatic fatigue, as defined by a decline in Fc, does not occur during the neonatal biphasic hypoxic response.

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Accession: 006459399

PMID: 3562122

DOI: 10.1203/00006450-198703000-00006

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White, G. A., 1975: Distinguishing characteristics of Crambe abyssinica and C. hispanica. Morphological characteristics and chromosome numbers were compared to clarify the distinction between C. abyssinica and C. hispanica. Chromosome numbers and basal leaf shapes proved to be the most reliable distinctive features. Length and structur...

Giese, AC.; Pearse, JS., 1975: Reproduction of marine invertebrates. Volume 2. Entoprocts and lesser coelomates. Unknown

Carpenter, Kathleen-Oliver, 1983: The Dieting dilemma. Two out of 3 women report they are on a diet at any given time. Teenage girls are even more vulnerable to nutritionally unbalanced fad diets. Weight control diets should not: encourage rapid weight loss; compromise growth by severely restricting i...

Prebble, B. R., 1969: Patterns of land use change around a large reservoir. By examining the spatial patterns of land use changes around a reservoir, this study hopes to aid planners anticipate wind-fall profits to landowners, improve environmental quality control, guide the land use planning of surrounding communities, a...

Fahmy, A. S.; Mohamed, S. A.; Kamel, M. Y., 1994: Studies on the urea cycle of camel tick Hyalomma dromedarii during embryogenesis. Engorged females of H. dromedarii were collected from camels [dromedaries] in Cairo, Egypt, and allowed to oviposit. The quantities of urea cycle intermediates in developing embryos were determined. Citrulline, arginine, ornithine and proline were...

Galosy S.S.; Gertler A.; Elberg G.; Laird D.M., 1991: Distinct placental lactogen and prolactin lactogen receptors in bovine endometrium. Specific binding sites for bovine placental lactogen (bPL) and the lactogenic hormone, prolactin, have been detected in endometrial membranes isolated from uteri of mid-pregnant heifers. The specific binding of human growth hormone (hGH) (used to...

Butnaru, H.; Marina, S.; Precupas, A., 1968: Studies on the bearing potential of the pungent pepper cv. Arad and its optimum development during forcing. To prevent flower abortion on the lower tiers of pepper plants during forcing, seeds and plants were treated with 0.08% Mo, 0.05% Mn, 0.1% B or 0.005% Zn (seeds) or 0.03% Zn (plants). These treatments stimulated plant growth and resulted in early...

Zander, Arnold, 1928: Laticiferous ducts of hemp. The laticiferous ducts of hemp form a new type, being unbranched unicellular. They occur as cylindrical canals in the phloem, but are absent in the root, cotyledons and the greater part of the hypocotyl. They become established at the tip of the s...

Stalsberg, Alf., 1991: Bujurquina cf. peregrinabunda. DATZ. Januar; 441: 11-13

Severinson, Eva; Elenstrom, Carina; Davey, Edward, 1994: Interleukin 4-induced motility and adhesion in murine B lymphocytes. Journal of Cellular Biochemistry Supplement 0(18D): 439