As a result of the intrinsic curves of the spine an injection made at L4 or lower with the patient in the supine position will tend to spread caudad and that made at L3 or higher will spread cephalad.
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Hyperbaric solutions (SG > 1.009) will tend to spread caudad in patients in the sitting position and cephalad in patients in the Trendelenberg position . As a result of the intrinsic curves of the spine an injection made at L4 or lower with the patient in the supine position will tend to spread caudad and that made at L3 or higher will spread cephalad. |
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Hypobaric Solutions (SG < 1.003) spread in the opposite direction to hyperbaric solutions. |