Summary
Intravenous infusion of the nucleoside adenosine stimulates respiration, probably at least partly by an action in the carotid bodies, and also potentiates the ventilatory response to hypoxia, suggesting that it might be involved in the control of breathing.
Whether the effects of adenosine occur at concentrations likely to be achieved in vivo is unknown and was investigated in 7 patients with arterial catheters inserted for diagnostic purposes.
During intravenous infusion of adenosine (Maximum dose per min: mean 130 μg kg−1) mean minute ventilation increased from 5.5 to 10.9 l min−1 while mean plasma adenosine concentration in the aortic arch increased from 0.07 to 1.2 μM. In 3 patients ventilation first increased without a detectable increase in aortic adenosine concentration, suggesting a possible intra-pulmonary effect of adenosine, although increased concentrations were apparent at higher doses.
Micromolar concentrations of adenosine are probably achieved in vivo in tissues during hypoxia. The present results show that at such concentrations adenosine stimulates respiration and are consistent with the suggestion that adenosine release may mediate or modulate the ventilatory response to hypoxia. A possible intra-pulmonary effect of adenosine merits further study.
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Reid, P.G., Watt, A.H., Penny, W.J. et al. Plasma adenosine concentrations during adenosine-induced respiratory stimulation in man. Eur J Clin Pharmacol 40, 175–180 (1991). https://doi.org/10.1007/BF00280073
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DOI: https://doi.org/10.1007/BF00280073