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Query: UMLS:C0085383 (hypocapnia)
 1,697 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

This study evaluated phosphate excretion in response to atrial natriuretic peptide during acute hypocapnia in the presence or absence of the renal nerves in rats. To achieve a hypocapnic state, rats were mechanically hyperventilated with room air. As mechanical ventilation per se has been reported to affect renal excretory functions depending on the ventilatory conditions, this study was designed to examine renal functions during acute hypocapnia as compared with those during normocapnia produced by normal and/or hyperventilation. Rats were divided into three experimental groups: 1) a normally ventilated normocapnic (control) group (n = 8), 2) a hyperventilated normocapnic group (n = 8), and 3) a hyperventilated hypocapnic group (n = 8). The innervated right kidney served as a control for the contralateral denervated kidney. Acute renal denervation produced a greater phosphaturia compared to the innervated kidney during the control period in the two normocanic groups but not in the hypocapnic group. Infusion of ANP 12 micrograms/kg/h produced a remarkable increase in phosphate excretion in either kidney in the normocapnic groups. The degree of the phosphaturia (delta FEPi%) during infusion of ANP was similar between the normally ventilated and hyperventilated normocapnic groups both in innervated (10.6 +/- 2.4% and 7.4 +/- 1.2%) and denervated (14.0 +/- 3.0% and 13.5 +/- 2.2%) kidneys. In contrast to both normocapnic groups, the hypocapnic group had a greater hypophosphaturia during the control and ANP infusion periods in either kidney. The increase in fractional excretion of phosphate was smaller both in innervated (0.34 +/- 0.34% delta FEPi) and denervated (0.72 +/- 0.69% delta FEPi) kidneys than that in the other two normocapnic groups.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:[Acute hypocapnia attenuates phosphaturic effect of atrial natriuretic peptide in rats]. 775 Jun 24

1. Hypocapnia has been shown to blunt the natriuretic effect of atrial natriuretic peptide (ANP) independently of the renal nerves. In order to examine whether the adrenal glands are a limiting factor for the natriuretic effect of ANP, we evaluated the natriuretic responses of adrenalectomized rats to ANP infusion during hypocapnia. 2. Rats subjected to total adrenalectomy (ADX) or sham-operation (sham) were divided into hypocapnic and normocapnic groups depending on their arterial PCO2 levels. 3. In sham rats, ANP infusion at a rate of 12 micrograms/kg per h resulted in a smaller increase in the fractional excretion of sodium during hypocapnia (mean +/- SEM: 1.02 +/- 0.40%, n = 10) than normocapnia (3.95 +/- 0.64%, n = 9; P < 0.001). The level of fractional excretion of sodium with ANP infusion during hypocapnia was not significantly different from the level in saline-infused hypocapnic sham rats (0.93 +/- 0.62%, n = 10). In hypocapnic ADX rats (n = 11), ANP induced greater increases in the fractional excretion of sodium (5.59 +/- 1.35%) than did saline infusion (1.04 +/- 1.02%, n = 10; P < 0.002). In the absence of adrenal glands, the magnitude of natriuresis after ANP infusion during hypocapnia and normocapnia (3.32 +/- 1.07%, n = 9) were the same. 4. We conclude that the natriuretic effect of ANP is blunted during hypocapnia in the presence, but not in the absence, of adrenal glands. Our data suggest that the adrenal glands have an important role in limiting the natriuretic effect of ANP.
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PMID:Adrenalectomy overcomes the blunted natriuretic response to atrial natriuretic peptide during hypocapnia in rats. 936 68