title: Effects of electroimmobilisation on blood gas and pH status in sheep.
abstract: Arterial blood gases, pH and haemoglobin concentrations were monitored for 20 minutes before, during and for 120 minutes after 60 seconds of electroimmobilisation (E-IM) at current strengths of 0 mA (control), 40 mA and 60 mA in 17 Merino ewes (36.3 +/- 1.0 kg) previously prepared with unilateral carotid artery loops. E-IM elicited whole body rigidity. During E-IM, breathing was stopped for 50 +/- 3 seconds (40 mA) and 56 +/- 2 seconds (60 mA). Arterial PO2 decreased to 43.2 +/- 2.4 mmHg (5.68 +/- 0.32 kPa) (40 mA) and 36.4 +/- 1.8 mmHg (60 mA) while arterial PCO2 rose to 59.7 +/- 1.9 mmHg (40 mA) and 69.8 +/- 2.0 mmHg (60 mA). There was a significant fall in arterial pH to 7.272 +/- 0.014 (40 mA) and 7.233 +/- 0.011 (60 mA) during E-IM and arterial haemoglobin increased by 34 +/- 3 per cent and 35 +/- 3 per cent at 40 mA and 60 mA, respectively. All the arterial blood gas and pH changes were significantly greater (P less than 0.05) during E-IM at 60 mA than at 40 mA. Multiple regression analysis indicated that the decrease in arterial PO2 during E-IM was directly related to the latency to breathe while the changes in arterial PCO2 and pH during E-IM were not.2+off
authors.affiliation: Department of Physiology, Monash University, Clayton, Victoria, Australia.
authors.forename: E H
authors.initials: EH
authors.lastname: Jephcott
authors.forename: R D
authors.initials: RD
authors.lastname: Lynn
authors.forename: G D
authors.initials: GD
authors.lastname: Thorburn
authors.forename: I C
authors.initials: IC
authors.lastname: McMillen
mesh_terms: D000818:Animals; D001522:Behavior, Animal; D001784:Blood Gas Analysis / Q000662:veterinary; D002245:Carbon Dioxide / Q000097:blood*; D004558:Electric Stimulation; D004566:Electrodes / Q000662:veterinary; D005260:Female; D006454:Hemoglobins / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D007103:Immobilization / Q000502:physiology*; D010100:Oxygen / Q000097:blood*; D012044:Regression Analysis; D012119:Respiration; D012756:Sheep / Q000097:blood*
chemical_list: D006454:Hemoglobins; D002245:Carbon Dioxide; D010100:Oxygen