OBJECTIVES: I. Evaluate the safety and effectiveness of 3,4-diaminopyridine (DAP) in the treatment of patients with Lambert-Eaton myasthenic syndrome (LEMS). II. Determine the side-effects and benefits associated with DAP.

Condition	Treatment or Intervention
Lambert-Eaton Myasthenic Syndrome	Drug: 3,4-diaminopyridine

Further Study Details: 

Expected Total Enrollment:  26

PROTOCOL OUTLINE: This is a randomized, double blind, placebo controlled study. Patients are randomized to receive 3,4-diaminopyridine (DAP) or placebo orally 3 times daily for 5 days, after which treatment is discontinued and patients are observed for at least 24 hours. At the end of the blinded study, patients may then elect to take open label DAP orally 3 times daily for 6 months; those who do so are monitored for clinical effects and side effects for at least 6 months.

Ages Eligible for Study:  18 Years and above,  Genders Eligible for Study:  Both

Criteria

PROTOCOL ENTRY CRITERIA: --Disease Characteristics-- Lambert-Eaton myasthenic syndrome (LEMS) based on weakness that predominates in proximal limb muscles and electromyography (EMG) findings of small amplitude muscle responses to nerve stimulation, which decrease further during nerve stimulation at 5 Hz and which increase at least 2-fold after maximum voluntary contraction of the muscle for 10-20 seconds Quantified Myasthenia Gravis (QMG) clinical score at least 5 --Prior/Concurrent Therapy-- Chemotherapy: No concurrent chemotherapy Endocrine therapy: Patients receiving immunosuppressants must be on the same dose of medication for at least 3 months prior to study entry Radiotherapy: No concurrent radiotherapy Surgery: No concurrent surgery Other: Patients receiving cholinesterase inhibitors must discontinue the medication at study entry if possible, or else be on the same dose of medication for at least 1 month prior to study entry --Patient Characteristics-- Hematopoietic: No significant hematologic disease Hepatic: No significant hepatic disease Renal: No significant renal disease Cardiovascular: No cardiac arrhythmia or significant cardiac disease Neurologic: No seizure disorder Other: Not pregnant Negative pregnancy test required of fertile women Effective contraception required of fertile women

Study chairs or principal investigators

Donald B. Sanders,  Study Chair,  Duke University   

Study ID Numbers:  199/13441; DUMC-577; DUMC-FDR001068
Record last reviewed:  July 1998
Last Updated:  October 13, 2004
Record first received:  February 24, 2000
ClinicalTrials.gov Identifier:  NCT00004832
Health Authority: United States: Federal Government
ClinicalTrials.gov processed this record on 2005-04-08