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OBJECTIVE To examine the relationships between intensity of delivery room resuscitation and short- and long-term outcomes of very low birth weight infants enrolled in the Caffeine for Apnea of Prematurity (CAP) Trial. STUDY DESIGN The CAP Trial enrolled 2006 infants with birthweights between 500 and 1250 g who were eligible for caffeine therapy. All(More)
We tested the hypothesis that the function of cholinergic-nicotinic receptors on respiration is age dependent. To this end, we used whole body plethysmography to measure breathing frequency (fR), tidal volume (V(T)) and minute ventilation (V (E)) under normoxia (21% O(2)) in rats at 1, 4, 7, 12 and 21 postnatal days before and after administration of(More)
Using the Reverse transcription-Polymerase chain reaction, we detected dopamine D2 receptor mRNA short and long isoforms in the adult carotid body of rats, cats, and rabbits. For these animals, the relative short/long ratios were 0.60, 0.65 and 0.57, respectively. Our results suggest that the variety of dopamine effects on carotid chemoreceptor activity,(More)
IMPORTANCE Extremely preterm infants may experience intermittent hypoxemia or bradycardia for many weeks after birth. The prognosis of these events is uncertain. OBJECTIVE To determine the association between intermittent hypoxemia or bradycardia and late death or disability. DESIGN, SETTING, AND PARTICIPANTS Post hoc analysis of data from the inception(More)
This study determined: (1) whether dopamine (DA) D2-receptor (R) and D1-R mRNA levels in the carotid body (CB), petrosal ganglion (PG) and superior cervical ganglion (SCG) are modulated by hypoxia; (2) the role of hypoxia intensity and exposure duration, and (3) whether the pattern of modulation differs between newborn (1-day-old) and adult rabbits. Rabbits(More)
The activities of carotid chemoreceptors at three levels of inspired PO2 (55, 145 and 690 Torr) and at two levels of inspired PCO2 (35 and 70 Torr in O2) were studied in 28 anesthetized, mechanically ventilated kittens aged 0-17 days. A biphasic response to hypoxia was found in 46% of them: the chemosensory activity increased to a peak within 30 sec after(More)
Doxapram is a respiratory stimulant which acts on peripheral chemoreceptors and central respiratory neurons in a dose-dependent fashion in the adult cat. In the newborn, the mechanisms of action of doxapram are still unclear. To evaluate the effects of doxapram on the carotid chemosensory discharge and its relationship with dopaminergic mechanisms in the(More)
The mechanisms underlying the therapeutic function of caffeine on apneas in preterm neonates are not well determined. To better understand these effects, we exposed rat pups from postnatal d 3-12 to chronic intermittent hypoxia (5% O2/100 s every 10 min; 6 cycles/h followed by 1 h at 21% O2, 24 h/d), a model mimicking hypoxemic exposure in apneic neonates.(More)