Fast awakening from minimally conscious state with apomorphine.

Author(s): Fridman EA, Calvar J, Bonetto M, Gamzu E, Krimchansky BZ, Meli F, Leiguarda RC, Zafonte R

Affiliation(s): Neurorehabilitation Section and Spasticity Clinic, Neurology Department, Institute for Neurological Research, F.L.E.N.I., Buenos Aires, Argentina. efridman@fleni.org.ar

Publication date & source: 2009-02, Brain Inj., 23(2):172-7.

Publication type: Case Reports; Research Support, Non-U.S. Gov't

BACKGROUND: Traumatic brain injury (TBI) can induce long-term severe disorders of consciousness. Evidence suggests an underlying dopaminergic deficit. Dopamine agonists may therefore play an important role in recovery of consciousness. OBJECTIVE: To explore the response to continuous subcutaneous administration of apomorphine in a patient who had remained in minimally conscious state for 104 days and to evaluate the anatomical substrate of the effect. DESIGN: A prospective, open-label, daily treatment, dose-escalation single case clinical study, with retrospective diffusion tensor image (DTI) evaluation. RESULTS: On the fist day of treatment, the patient was able to move his limbs on command and answer yes/no questions which had not been the case prior to apomorphine administration. Subsequently there was a full recovery of consciousness and substantial functional recovery that was sustained even after apomorphine discontinuation. At the highest dose, mild dyskinesias were observed. These resolved with a lowering of the dose. DTI demonstrated a decrease of thalamocortical and corticothalamic projections in this MCS patient compared to normal volunteers. CONCLUSION: Although this is an open-label single-patient case report, the data are consistent with the theory that a dopaminergic deficit underlies MCS and that it may be overcome with apomorphine administration.