Um, Letâs Rethink That Salute (1930s) Again, in his book To the Flag: The Unlikely History of the Pledge of Allegiance, Richard J. Ellis explains that by the mid-1930s, Americans had begun to notice eerie similarities between the Bellamy salute and the âHeil Hitlerâ salute.
A lumbar puncture may be used to collect a sample of cerebrospinal fluid in order to detect the presence of certain types of cancer or infection. Lumbar punctures may also be used to inject medications, such as spinal anesthesia or chemotherapy drugs.
During a lumbar puncture, a hollow needle is inserted through the skin in the lower back. The needle passes between the vertebrae and into the spinal canal. A lumbar puncture can be used to: collect CSF for testing to detect disease conditions. measure CSF pressure to detect hydrocephalus.