Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-5434
Schäffer, L; Müller-Vicentini, D; Rauh, M; Tomaske, M; Arlettaz, R; Bauersfeld, U; Beinder, E (2008). Cardiac autonomic balance in small-for-gestational-age neonates. AJP - Heart and Circulatory Physiology, 294(2):H884-H890.
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The cardiac sympathetic nervous system is one putative key factor involved in the intrauterine programming of adult cardiovascular disease. We therefore analyzed cardiac autonomic system activity in small for gestational age (SGA) neonates. Heart rate variability (HRV) from 24-h ECG recordings were analyzed for time-domain and frequency-domain parameters in 27 SGA neonates [median 261 (240-283) days of gestation] compared with 27 appropriate for gestational age (AGA) neonates [median 270 (239-293) days of gestation]. In addition, salivary alpha-amylase levels were analyzed during resting conditions and in response to a pain-induced stress event in 18 SGA [median 266 (240-292) days of gestation] and 34 AGA [median 271 (240-294) days of gestation] neonates. Overall HRV was not significantly different in SGA neonates compared with AGA neonates (SD of all valid NN intervals: P = 0.14; triangular index: P = 0.29), and the sympathovagal balance [low frequency (LF)/high frequency (HF)] was similar (P = 0.62). Parameters mostly influenced by sympathetic activity did not reveal significant differences: (SD of the average of valid NN intervals: P = 0.27; average of the hourly means of SDs of all NN intervals: P = 0.66, LF: P = 0.83) as well as vagal tone-influenced parameters were unaltered (average of the hourly square root of the mean of the sum of the squares of differences between adjacent NN intervals: P = 0.59; proportion of pairs of adjacent NN intervals differing by >50 ms: P = 0.93; HF: P = 0.82). Median resting levels for alpha-amylase were not significantly different in SGA neonates (P = 0.13), and a neonatal stress stimulus revealed similar stress response patterns (P = 0.29). HRV and salivary alpha-amylase levels as indicators of cardiac autonomic activity were not altered in SGA neonates compared with AGA neonates. Thus, it appears that the intrauterine activation of the sympathetic system in SGA fetuses does not directly persist into postnatal life, and neonatal sympathovagal balance appears to be preserved.
|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||04 Faculty of Medicine > University Hospital Zurich > Clinic for Obstetrics|
04 Faculty of Medicine > University Hospital Zurich > Clinic for Neonatology
04 Faculty of Medicine > University Children's Hospital Zurich > Medical Clinic
|DDC:||610 Medicine & health|
|Deposited On:||13 Nov 2008 10:21|
|Last Modified:||23 Nov 2012 16:32|
|Publisher:||American Physiological Society|
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