Table 1.

List of chronic pain syndromes from 37 randomized controlled trials on the efficacy of ketamine on chronic pain relief (2009–2012) [9]

Syndrome	Number of studies
Acute and chronic migraine	2
Breakthrough (non)-cancer pain	1
Central neuropathic pain	2
Chemotherapy-induced neuropathy	1
Chronic neuropathic pain (various causes)	9
Complex regional pain syndrome	3
Fibromyalgia	3
Painful limb ischaemia	2
Peripheral nerve injury (traumatic)	4
Phantom limb pain	1
Post-herpetic neuralgia	1
Spinal cord injury	2
Temporomandibular pain	2
Trigeminal neuropathic pain	1
Whiplash	3