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Randomized Study of 3,4-Diaminopyridine for Lambert-Eaton Myasthenic Syndrome

This study has been completed.
Duke University
Information provided by:
FDA Office of Orphan Products Development Identifier:
First received: February 24, 2000
Last updated: March 24, 2015
Last verified: July 1998

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

Study Type: Interventional
Study Design: Allocation: Randomized
Masking: Double-Blind
Primary Purpose: Treatment

Resource links provided by NLM:

Further study details as provided by FDA Office of Orphan Products Development:

Estimated Enrollment: 26
Study Start Date: August 1994
Estimated Study Completion Date: June 1998
Detailed Description:
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 older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No


--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

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Please refer to this study by its identifier: NCT00004832

Sponsors and Collaborators
FDA Office of Orphan Products Development
Duke University
Study Chair: Donald B. Sanders Duke University
  More Information Identifier: NCT00004832     History of Changes
Other Study ID Numbers: 199/13441
Study First Received: February 24, 2000
Last Updated: March 24, 2015

Keywords provided by FDA Office of Orphan Products Development:
Lambert-Eaton myasthenic syndrome
neurologic and psychiatric disorders
rare disease

Additional relevant MeSH terms:
Lambert-Eaton Myasthenic Syndrome
Paraneoplastic Syndromes, Nervous System
Paraneoplastic Syndromes
Pathologic Processes
Nervous System Neoplasms
Neoplasms by Site
Autoimmune Diseases of the Nervous System
Nervous System Diseases
Neurodegenerative Diseases
Neuromuscular Junction Diseases
Neuromuscular Diseases
Autoimmune Diseases
Immune System Diseases
Potassium Channel Blockers
Membrane Transport Modulators
Molecular Mechanisms of Pharmacological Action processed this record on April 26, 2017