Vecuronium-induced depression of phrenic nerve activity during hypoxia in the rabbit.

Abstract:

:We investigated the effects of a close carotid injection of vecuronium on changes in phrenic nerve activity during different states of oxygenation. Experiments were performed on normothermic and mechanically ventilated adult New Zealand White rabbits with a tracheostomy under continuous thiopental infusion. Carotid arteries and carotid bodies were identified bilaterally followed by glomectomy on the contralateral side and positioning of a lingual artery catheter with its tip located in the carotid bifurcation on the ipsilateral side. From the dissected ipsilateral C-4 nerve root, changes in integrated phrenic nerve activity (IPA) were recorded after isocapnic step reductions from hyperoxia to normoxia (fraction of inspired oxygen [FIO2] 0.21, normoxic challenge) and from hyperoxia to moderate hypoxia (FIO2 0.15, hypoxic challenge) immediately after a close carotid bolus injection of either normal saline or 1 or 10 microgram of vecuronium. Arterial blood gases were analyzed during each ventilatory state. Phrenic nerve response to hypoxia expressed as chemosensitivity (Sch) was computed as the relative change in phrenic nerve activity per unit decrease in arterial oxygen saturation (Sao2), that is: Sch = (IPA challenge/IPA hyperoxia) - 1/Sao2 hyperoxia - Sao2 challenge. Hypoxic challenges were associated with reduced phrenic nerve response (Sch) after injection of 1 and 10 micrograms of vecuronium compared with normal saline. During normoxic challenges, no change occurred after 1 microgram, but reduced chemosensitivity was seen after 10 micrograms of vecuronium. We conclude that vecuronium depresses phrenic nerve activity during hypoxia.

journal_name

Anesth Analg

journal_title

Anesthesia and analgesia

authors

Wyon N,Eriksson LI,Yamamoto Y,Lindahl SG

doi

10.1097/00000539-199606000-00026

subject

Has Abstract

pub_date

1996-06-01 00:00:00

pages

1252-6

issue

6

eissn

0003-2999

issn

1526-7598

journal_volume

82

pub_type

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