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If increased effort is needed to fill the lungs, supraclavicular and infraclavicular retraction may be seen. In infants, sternal retraction occurs with only a slight increase in respiratory effort, the result of the pliability of their chests. Compare intercostal bulging.
LPs in infants are often done upright. After local anesthesia is injected into the small of the back (the lumbar area), a long needle is inserted in between the nearby bony building blocks of the spine (vertebrae) into the spinal canal. (The needle is usually placed between the 3rd and 4th lumbar vertebrae).