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  • Title: Baclofen-induced cough suppression in cervical spinal cord injury.
    Author: Dicpinigaitis PV, Grimm DR, Lesser M.
    Journal: Arch Phys Med Rehabil; 2000 Jul; 81(7):921-3. PubMed ID: 10896005.
    Abstract:
    OBJECTIVE: To determine the effect of the GABA-agonist baclofen on cough reflex sensitivity in subjects with cervical spinal cord injury (C-SCI). Baclofen has been shown to inhibit the cough reflex in able-bodied volunteers. DESIGN: Prospective, nonrandomized control trial. SETTING: Veterans Affairs medical center with large outpatient SCI population. PARTICIPANTS: Twelve adult males (11 outpatients) with C-SCI chronically maintained on oral baclofen for the treatment of muscle spasm. INTERVENTION: Subjects underwent cough challenge testing with inhaled capsaicin. The concentrations (microM) of capsaicin inducing 2 or more (C2) and 5 or more (C5) coughs were determined. Mean values for log C2 and log C5 were compared with a control group of outpatients with C-SCI not receiving baclofen. RESULTS: Subjects treated with baclofen had a significantly higher cough threshold (diminished cough reflex sensitivity) than control subjects. Mean (+/- standard error of the mean) values for log C2 in study subjects and controls were 1.28 +/- .16 and .65 +/- .15, respectively (p = .009). Mean values for log C5 in subjects receiving baclofen and in control subjects were 2.20 +/- .22 and 1.43 +/- .23, respectively (p = .024). Subjects and controls did not differ in terms of age, spirometric parameters, or duration of injury. CONCLUSIONS: The results suggest that chronic therapy with baclofen diminishes cough reflex sensitivity in subjects with C-SCI. The clinical significance of this finding remains to be elucidated.
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