RT Journal Article SR Electronic T1 Continuous Spinal Anesthesia in the Poor Risk and Aged Surgical Patient JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 93 OP 97 VO 18 IS 2 A1 C. E. Wasmuth A1 D.E. Hale YR 1951 UL http://www.ccjm.org/content/18/2/93.abstract AB