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Canadian Journal of Anesthesia, Vol 14, 119-122, Copyright © 1967 by Canadian Anesthesiologists' Society

A Note on the Recording of Epidural Negative Pressure

JOSÉ E. USUBIAGA M.D.1, FRANK MOYA M.D.1, and LILIA E. USUBIAGA M.D.1

1 Department of Anesthesiology, University of Miami School of Medicine and Jackson Memorial Hospital, Miami, Florida

A recording of the negative pressure of the epidural space is presented. Two components can be demonstrated: a basal subatmospheric pressure exaggerated by flexion of the spine and an artefactual value produced by further advancing the needle. Negative pressure is a segmental phenomenon since it can persist in one epidural area despite its disappearance in other remote zones.

During normal respiration two opposite cyclings of basal epidural pressure were observed, the pressure changes being more marked at the thoracic level. It is suggested that to enter the cervicothoracic epidural space, the needle should be advanced during inspiration, whereas in the lumbar region adequate position of the patient is far more important than the phase of the respiratory cycle.






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Copyright © 1967 by the Canadian Anesthesiologists' Society.