scholarly journals Evaluation of carbon dioxide rebreathing during exercise assisted by noninvasive ventilation with plateau exhalation valve

2017 ◽  
Vol Volume 12 ◽  
pp. 291-298 ◽  
Author(s):  
Yong-er Ou ◽  
Zhi-min Lin ◽  
Dong-ming Hua ◽  
Ying Jiang ◽  
Ya-ting Huo ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Noninvasive Ventilation ◽  
Carbon Dioxide Rebreathing ◽  
Exhalation Valve

The effect of a ketamine constant rate infusion on cardiovascular variables in sheep anesthetized at the minimum alveolar concentration of sevoflurane that blunts adrenergic responses

2022 ◽  
pp. 1-7
Author(s):  
Kevin Chang ◽  
Michele Barletta ◽  
Kristen M. Messenger ◽  
Daniel M. Sakai ◽  
Rachel A. Reed ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Minimum Alveolar Concentration ◽  
Plasma Concentrations ◽  
Face Mask ◽  
Constant Rate Infusion ◽  
Carbon Dioxide Rebreathing ◽  
Constant Rate ◽  
Significant Difference ◽  
Treatment Administration ◽  
Rate Infusion

Abstract OBJECTIVE To evaluate the effect of a constant rate infusion of ketamine on cardiac index (CI) in sheep, as estimated using noninvasive cardiac output (NICO) monitoring by partial carbon dioxide rebreathing, when anesthetized with sevoflurane at the previously determined minimum alveolar concentration that blunts adrenergic responses (MACBAR). ANIMALS 12 healthy Dorset-crossbred adult sheep. PROCEDURES Sheep were anesthetized 2 times in a balanced placebo-controlled crossover design. Anesthesia was induced with sevoflurane delivered via a tight-fitting face mask and maintained at MACBAR. Following induction, sheep received either ketamine (1.5 mg/kg IV, followed by a constant rate infusion of 1.5 mg/kg/h) or an equivalent volume of saline (0.9% NaCl) solution (placebo). After an 8-day washout period, each sheep received the alternate treatment. NICO measurements were performed in triplicate 20 minutes after treatment administration and were converted to CI. Blood samples were collected prior to the start of NICO measurements for analysis of ketamine plasma concentrations. The paired t test was used to compare CI values between groups and the ketamine plasma concentrations with those achieved during the previous study. RESULTS Mean ± SD CI of the ketamine and placebo treatments were 2.69 ± 0.65 and 2.57 ± 0.53 L/min/m2, respectively. No significant difference was found between the 2 treatments. Mean ketamine plasma concentration achieved prior to the NICO measurement was 1.37 ± 0.58 µg/mL, with no significant difference observed between the current and prior study. CLINICAL RELEVANCE Ketamine, at the dose administered, did not significantly increase the CI in sheep when determined by partial carbon dioxide rebreathing.

An Unusual Cause of Carbon Dioxide Rebreathing

1995 ◽  
Vol 81 (2) ◽  
pp. 434-435
Author(s):  
Ninos J. Joseph ◽  
M. Ramez Salem ◽  
Adamina G. Podraza ◽  
Stanley M. Aung
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Rebreathing

CARBON DIOXIDE REBREATHING DURING CATARACT SURGERY

1990 ◽  
Vol 70 (Supplement) ◽  
pp. S31
Author(s):  
E. A. Bowe ◽  
W. D. Hyman ◽  
E. F. Klein
Keyword(s):  
Carbon Dioxide ◽  
Cataract Surgery ◽  
Carbon Dioxide Rebreathing
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