Anesthesia Delivery Methodology
The ways and types of veterinary anesthesia delivery is limited. In simple cases animals can receive injections to relax them or get a topical cream to numb an area. Surgery that requires an animal to be unconscious during the procedure demands more powerful agents.
When an animal has a procedure that requires sustained unconsciousness the vet uses one of two different types of anesthesia delivery apparatus commonly referred to as a ‘non-rebreather circuit’ or a ‘rebreather circuit’.
The circuits work by providing both oxygen and anesthetic gases to the animal while they are unconscious. Both circuits also work to remove carbon dioxide during the procedure.
Non-rebreather circuits are used when working with animals weighing ten pounds or lighter. Non-rebreathers are the best choice for smaller animals because there is little to no resistance to breathing caused by the apparatus.
A non-rebreather keeps-almost all-exhaled gases from re-circulating into back to the patient. The non-rebreather also has less parts than the rebreather.
Non-rebreathers work by creating a two way flow of gases without resistance. Exhaled gases are moved from the passageways by introducing a higher flow of fresh gas. This is why non-rebreathers are more expensive to use.
Rebreather circuits are used when working with animals heavier than fifteen pounds. Rebreathers are more cost effective to use when working with larger animals. Larger animals are capable of producing the necessary air pressure to ventilate exhaled gases because their diaphragms are stronger.
Rebreather circuits use a lower gas flow which results in a slower anesthetic effect. The rebreather works in three steps.
1) The patient breathes in the gases. They draw the gases through the inspiratory valve into the breathing tube.
2) The patient exhales the gases. Exhaling causes the gases to exit through the Y-piece, through the breathing tube, and into the expiratory valve.
3) Exhaled gases enter into the reservoir bag before or after passing through the absorber circuit. After passing through the absorber circuit the gases are then re-inhaled, along with fresh supply, the CO2 having been removed.
Further Notes on the Non-Rebreather: The Bain Circuit Adapter
When a patient can find it difficult to breathe on their own you can use the Bain Circuit Adapter. This adapter increases the control the vet has in case of intervention.
The Bain Circuit Adapter works by using a momentary pop-off valve that you can quickly close with a touch. This gives the vet the option to immediately ventilate in case of emergency. The Bain Circuit Adapter prevents the issue of forgetting to re-open the valve.
The Bain Circuit Adapter also includes an easy to read pressure valve so the vet can continually check the patient’s breathing pressure with a glance.
Interested in Learning More About Non-Rebreathers?
Are you interested in the impact, safety, and ease of use for non-rebreather circuits? You can learn more about non-rebreathers here…