Remote-controlled device for sampling arterial blood in unrestrained animals

Area of Science:

• Veterinary Medicine
• Animal Physiology
• Biomedical Engineering

Background:

• Assessing blood gas and pH levels in animals typically requires restraint or invasive procedures.
• Existing methods can induce stress and alter physiological parameters, affecting data accuracy.
• A need exists for non-invasive, remote blood sampling techniques in conscious, unrestrained animals.

Purpose of the Study:

• To describe a novel device for remote-controlled arterial blood sampling in unrestrained animals.
• To enable accurate in-situ analysis of blood gases and pH.
• To provide a versatile technique applicable across various vertebrate species.

Main Methods:

• A surgical shunt was created connecting an artery and vein with a catheter in animals under local anesthesia.
• A remote-controlled device was used to kink the catheter, trapping a small blood volume (0.45 ml).
• In-line electrodes analyzed the trapped arterial blood for partial pressure of oxygen (PO2), partial pressure of carbon dioxide (PCO2), and pH.

Main Results:

• The device successfully enabled remote-controlled collection of arterial blood samples.
• Analysis of trapped blood provided accurate measurements of PO2, PCO2, and pH.
• The technique was validated in avian species (ducks and hens).

Conclusions:

• The described device offers a minimally invasive method for repeated arterial blood sampling in unrestrained animals.
• This technique facilitates real-time physiological monitoring and reduces animal stress.
• The method is adaptable for various vertebrate species, including smaller animals.