Lambert-Eaton Myasthenic Syndrome - A Clinical Review

<p><strong>Lambert–Eaton myasthenic syndrome (LEMS)</strong> is a rare autoimmune condition that disrupts communication between nerves and muscles by blocking the release of <strong>acetylcholine</strong>. This clinical review highlights the disorder&#39;s signature <strong>triad of symptoms</strong>, which includes leg-heavy weakness, diminished reflexes, and autonomic issues like dry mouth. A critical aspect of the text is the link between LEMS and <strong>small-cell lung cancer</strong>, noting that the neurological symptoms often serve as a preliminary warning for an underlying tumor. Beyond LEMS, the sources compare various <strong>presynaptic disorders</strong>, such as botulism and genetic myasthenic syndromes, which share similar electrical patterns despite different causes. Diagnostic protocols emphasize a combination of <strong>antibody testing and electrophysiology</strong> to differentiate these conditions from other neuromuscular diseases. Finally, the material outlines management strategies ranging from <strong>symptomatic medications like amifampridine</strong> to long-term immunotherapy and cancer-directed treatments. </p><p>This episode is based on a paper written exclusively for the Weekly Neurology Deep Dive Podcast by Amer A. Ghavanini MD PhD FRCPC.</p>