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.
1 A lumbar puncture is not done if the person has: 2  A suspected tumor, swelling, or increased pressure in the brain. A computed tomography (CT) scan or magnetic resonance imaging (MRI) scan may be done first to see if it is safe to do the lumbar puncture.  A skin infection on the lower back.