![Fig. 2. The ventilatory (VE, A ), frequency (f, B ), and tidal volume (VT, C ) responses to N2of 10 s before and after microinjecting different [D-Ala2, N-MePhe4, Gly-ol]-enkephalin (DAMGO) doses into the commissural subnucleus of the nucleus tractus solitarius. Note: All the respiratory variables (VE,f, and VT) during the brief period of hypoxia were significantly higher than baseline values except those after 2.5 mM DAMGO microinjection. n = 8 in each group; data are presented as means ± SE; P values less than 0.05 are presented exactly with the exception that *=P < 0.05 compared with other DAMGO concentrations, whereas those more than 0.78 are not presented.](https://asa2.silverchair-cdn.com/asa2/content_public/journal/anesthesiology/115/2/10.1097_aln.0b013e318224cc1f/2/22ff2.png?Expires=1716559715&Signature=PfsTe3jpwZHTHVvRHpCw0emVjgKOMhRtQm7qesrJjqBfmPf0rJiGntQJ52uhrvr4A1IqR15jViCpnxUFh2bL63pQHwwAj8wIvm5CWMXITr3vewC1CVXqLGFrdQpwT34YaAZPIopn1AJbfZbydpn3Qks0FsKAEnJGn4Aw2y0Bj~TUkG3wavNVc4~VMlMw8PXjo6XlHzt4z0JF79hZhuxClY~FzugCrOHbEISNiw625~NMHhBcJznWl3ELX3tGyz88ehmAvsR15hZomVP0MYTJLKnT6BwLKiizkFIQQpkd4xsQUqBdyz~HI62Ci21U3pwAlwMyn6VGpF98Y7FUMunAtw__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
Fig. 2. The ventilatory (VE, A ), frequency (f, B ), and tidal volume (VT, C ) responses to N2of 10 s before and after microinjecting different [D-Ala2, N-MePhe4, Gly-ol]-enkephalin (DAMGO) doses into the commissural subnucleus of the nucleus tractus solitarius. Note: All the respiratory variables (VE,f, and VT) during the brief period of hypoxia were significantly higher than baseline values except those after 2.5 mM DAMGO microinjection. n = 8 in each group; data are presented as means ± SE; P values less than 0.05 are presented exactly with the exception that *=P < 0.05 compared with other DAMGO concentrations, whereas those more than 0.78 are not presented.
