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- W2172296904 abstract "Background Diphenhydramine is used as an antipruritic and antiemetic in patients receiving opioids. Whether it might exacerbate opioid-induced ventilatory depression has not been determined. Methods The ventilatory response to carbon dioxide during hyperoxia and the ventilatory response to hypoxia during hypercapnia (end-tidal pressure of carbon dioxide [PETCO2] is approximately equal to 54 mmHg) were determined in eight healthy volunteers. Ventilatory responses to carbon dioxide and hypoxia were calculated at baseline and during an alfentanil infusion (estimated blood levels approximately equal to 10 ng/ml) before and after diphenhydramine 0.7 mg/kg. Results The slope of the ventilatory response to carbon dioxide decreased from 1.08+/-0.38 to 0.79+/-0.36 l x min(-1) x mmHg(-1) (x +/- SD, P < 0.05) during alfentanil infusion; after diphenhydramine, the slope increased to 1.17+/-0.28 l x min(-1) x mmHg(-1) (P < 0.05). The minute ventilation (VE) at PETCO2 approximately equal to 46 mmHg (VE46) decreased from 12.1+/-3.7 to 9.7+/-3.6 l/min (P < 0.05) and the VE at 54 mmHg (VE54) decreased from 21.3+/-4.8 to 16.6+/-4.7 l/min during alfentanil (P < 0.05). After diphenhydramine, (VE46 did not change significantly, remaining lower than baseline at 9.9+/-2.9 l/min (P < 0.05), whereas VE54 increased significantly to 20.5+/-3.0 l/min. During hypoxia, VE at SpO2 = 90% (VE90) decreased from 30.5+/-9.7 to 23.1+/-6.9 l/min during alfentanil (P < 0.05). After diphenhydramine, the increase in VE90 to 27.2+/-9.2 l/min was not significant (P = 0.06). Conclusions Diphenhydramine counteracts the alfentanil-induced decrease in the slope of the ventilatory response to carbon dioxide. However, at PETCO2 = 46 mmHg, it does not significantly alter the alfentanil-induced shift in the carbon dioxide response curve. In addition, diphenhydramine does not exacerbate the opioid-induced depression of the hypoxic ventilatory response during moderate hypercarbia." @default.
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- W2172296904 date "1998-09-01" @default.
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- W2172296904 title "Diphenhydramine Increases Ventilatory Drive during Alfentanil Infusion" @default.
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- W2172296904 doi "https://doi.org/10.1097/00000542-199809000-00013" @default.
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