VASG Reverse PEEP Valve

	Veterinary Anesthesia & Analgesia Support Group
	Practical Information for the Compassionate Veterinary Practitioner

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Reverse PEEP Positive Pressure Relief Valve

Dr. Bob Stein

1-2-2024

Despite the fact that we may employ experienced anesthetist and despite the fact that we may employ pop-off occlusion valves on our machines, we remain very much human beings with the very real potential to err.

Normally, PEEP valves are confugured to maintain a defined level of positive system pressure )positive end expiratory pressure) which can be beneficial to a certain number of patients. When configured as shown above, as an attachment to a "T" adaptor within the anesthetic system, the PEEP valve allows gas to escape if pressures exceed the PEEP valve pressure rating.

You cannot create any harmful effect with this setup. It is mechanically impossible to place the PEEP valve on the "T" adaptor backwards but if you did, it would simply not provide the positive pressure relief that the setup was intended to provide; in other words, you are no worse off than you were without it.

To add reverse PEEP valves to your systems you need two inexpensive components: an adaptor "T" and a 20 cmH2O PEEP valve. Both components can be obtained through www.HALLOWELL.com. The total current cost for both components is under $74 USD. Alternatively, other adjustable PEEP valves can be adapted to this purpose if you have the proper reducing adapter as noted below.



The Hallowell PEEP is the only valve that allows you to scavenge the waste gases outputted from the valve.


PEEP PN 000A6556
TEE PN 200A3707





Other PEEP valves can be used if you have the proper reducing adapter as depicted in the pictures above. There is no option to scavenge waste gases outputted from these valves.



The Airlife 2K8082 PEEP valve comes with its own reducing adapter.



Instrumentation Industries Reducing Adapter BE 190	2K8082 PEEP Valve