Zylicz Z. Opioid responsive central pain of cerebrovascular origin: a case report. Palliat Med1997; 11: 495–496.
2.
Backonja M, Arndt G, Gombar KA, Check B, Zimmerman M. Response to chronic neuropathic pain syndromes to ketamine: a preliminary study. Pain1994; 56: 51–57.
3.
Eide PK, Stubhaug A, Stenehjem A. Central dysaesthesia pain after traumatic spinal cord injury is dependent on N-methyl-D-aspartate receptor activation. Neurosurgery1995; 37: 1080–1087.
4.
Wood T, Sloan R. Successful use of ketamine for central pain. Palliat Med1997; 11: 57–58.
5.
Ripamonti C, Zecca E, Bruera E. An update on the clinical use of methadone for cancer pain. Pain1997; 70: 109–115.
6.
Gorman AL, Elliott KJ, Inturrisi CE. The d- and l- isomers of methadone bind to the non-competitive site on the N-methyl-D-aspartate (NMDA) receptor in rat forebrain and spinal cord. Neurosci Lett1997; 223: 5–8.