What is a retro-orbital injection?
Retro-Orbital Sinus Injection. • Is an injection into the ophthalmic venous. sinus (mice) or plexus (rats), or a retrobulbar. injection. • Is suited for the injection of non-irritating.
What is retro-orbital bleeding?
In retrobulbar bleeding (RBB), also known as retro-orbital bleeding, a capillary tube is used to disrupt the retrobulbar venous sinus located behind the eye. This technique can be used to collect a large volume of blood with or without anesthesia, typically without detriment to the subject animal’s general health.
What is the anatomical structure in the eye area that is punctured to obtain blood during retro-orbital blood collection?
The tip of the capillary tube is placed at the medial canthus of the eye under the nictitating membrane. A short thrust past the eyeball will enter the slightly resistant membrane of the sinus. The eyeball itself remains uninjured. As soon as the sinus is punctured, blood enters the tubing by capillary action.
Is retro-orbital injection IV?
Retro-orbital injections are an accepted intravenous route for administration of some compounds and the initiation of some parasitic infections in rodents. This technique requires hands-on training in both the injection technique and general anesthesia methods.
What is a retro-orbital headache?
Cluster headache (CH) is a distinct primary headache disorder characterized by attacks of excruciating pain, typically in a unilateral retro-orbital distribution, with associated ipsilateral autonomic features.1. From: Sleep and Neurologic Disease, 2017.
How much blood can you draw from a rat?
Single sample: Without fluid replacement, the maximum blood volume which can be safely removed for a one-time sample is 10% of the total blood volume or 5.5-7 ml/kg. With fluid replacement (LRS or sterile physiologic saline), up to 15% of the total blood volume or approximately 8.3-10.5 ml/kg can be removed.
Where do you inject mice?
Mice & Rats -Intramuscular Injection (IM) IM injections are administered in the thigh muscles of the hind limb. Caution must be used to avoid injury to the sciatic nerve, which is located in close proximity to the femur.
How many veins are in a mouse tail?
two
The mouse has two lateral tail veins and a tail artery located on the ventrum of the tail. A greater volume of blood may be collected from the artery, but care must be taken to ensure adequate hemostasis, and therefore should only be used if larger amounts are needed.
How do you collection the blood from the retro orbital plexus?
Blood is collected from the venous sinus. The rat is restrained, the neck gently scruffed and the eye made to bulge. A capillary tube/pipette is inserted medially, laterally or dorsally. Blood is allowed to flow by capillary action into the capillary tube/pipette, ensure proper aseptic technique is used.
