International Journal of Spine Surgery and Research
Open AccessFunctional Analysis of LIMB-OTM Adult Anaesthesia Circle Circuit at different Fresh Gas Flows during Spine Surgery
Authors: Chandrashekara CR, Chandrasekhara PM, Jyothsna Prabhat.
Abstract
Purpose: The present prospective clinical study was aimed at analysing the functional characteristics as well as the safety of the recently introduced Limb O anaesthesia breathing circuit during controlled mechanical ventilation at different fresh gas flows during spine surgery.
Method: The study was conducted on 50 adult healthy patients, who underwent spine surgery under general anaesthesia for more than three hours. The study was conducted with a decremental reduction of FGF in stages from the conventional 4 L/min. to 2 L/min; 1.5 L/min. and 1. L/min. The vital parameters studied during the study period included five lead ECG, HR, ABP, SpO2, ABG; Serum Electrolytes, Oropharyngeal temperature and urine output. The ventilation monitoring included: Tidal volume, Minute volume; Respiratory rate; Dynamic as well as static compliance of Peak Airway pressure and Mean airway pressure; PEEP value; FIO2; MAC of volatile anaesthetics. In addition, inspired as well as the expired EtCO2 values were monitored with a special consideration.
Results: The study demonstrated that biluminal single tube anaesthesia circuit performed well with no statistically significant differences in the studied parameters as long as the FGF was above 1.5 L/min. Rebreathing was observed with a low flow of 1.0 L/min. FGF and thus the study was restricted to 15 patients in this group.
Conclusion: The present study concludes that the minimum FGF of 1,5 L/min. is required to conduct a safe routine anaesthesia practice. while using 2.7 mts. long biluminal single tube Limb-O circuit.
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