IIA6 - Cisterna Magna CSF Collection

Question 1

How much CSF can safely be removed at once time?

Answer 1

1ml per 5kg of body weight

Question 2

What three landmarks can be used to determine the location for needle insertion for a cisternal CSF collection in dogs and cats?

Answer 2

1) External occipital protuberance
2) Cranial aspect of the dorsal spine of C2 (axis)
3) The transverse process of C1 (atlas)

Question 3

Why type of spinal needle should be used when performing a cisternal CSF collection in a horse?

Answer 3

3.5 inch 20g spinal needle

Question 4

What position should a horse be in for cisternal CSF collection?

Answer 4

Lateral recumbency (similar to a dog and cat)

Question 5

The “popping” felt when performing a cisternal tap on a horse occurs when the needle passes through which structures?

Answer 5

1) Atlantooccipital membrane
2) Cervical dura mater

Question 6

About how many centimeters is it to reach the subarachnoid space with performing a cisternal CSF tap in a mature horse?

Answer 6

5-8 cm

Question 7

What is unique about a cisternal CSF tap in cattle and why?

Answer 7

It is almost never performed due to cost and risk associated with general anesthesia. A lumber spinal tap can be safely performed in standing cattle under sedation

Question 8

What structures does the needle traverse when performing a cisternal CSF collection (from outside-in)?

Answer 8

1) Skin
2) SQ
3) Cervical muscles
4) Atlantooccipital membrane
5) Dura mater