Abstract
Posthypoxic myoclonus (PHM) is a possible sequela of acute hypoxic events. An acute form and a chronic form (the latter also referred to as Lance-Adams syndrome, LAS) have been described. Acute PHM is usually associated with a poor prognosis. LAS, instead, is characterized by myoclonus presenting or persisting as patients regain consciousness. It can improve over time, and when additional neurological symptoms are present those are usually mild. Differentiating these two phenotypes based on clinical and neurophysiological assessments (such as electroencephalogram recordings and somatosensory evoked potentials) is not always straightforward, although very important because of the different prognostic implications. There are differences in therapeutic approaches for acute and chronic PHM because of the different nature of the myoclonus (cortical vs. subcortical or a combination of the two) and concurrent events. Multidrug approaches are usually required in both settings, mostly leveraging antiepileptic medications. In patients with persistent and debilitating LAS, multistep and even surgical approaches, such as deep brain stimulation, can be attempted to maximize functional recovery.
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Seven patients with Lance-Adams syndrome (LAS, chronic posthypoxic myoclonus) are seen in this video segment. The first young woman survived an asthmatic arrest and is shown after discharge from the intensive care unit on her initial hospitalization. Myoclonic jerks of both outstretched hands are seen, with action myoclonus affecting attempt to write. The next patient developed LAS after surviving a respiratory arrest following a complication of thyroid surgery. Severe action and intention myoclonus are seen when she attempts to point to a letter board. The following young man developed LAS after a respiratory arrest. Despite treatment with multiple anti-myoclonic medications, he experienced episodes of exhausting continuous myoclonic jerking (myoclonic status) that would last up to an hour. Myoclonus was alcohol-responsive, and his family would administer wine to help terminate an episode. In between episodes, severe action myoclonus on finger to nose and manipulating a cup is present. Axial negative postural lapses triggered by standing prevented him from walking. The next patient developed LAS 25 years prior to this visit after an asthmatic respiratory arrest. Pendular rotatory nystagmus with oscillopsia accompanied his myoclonus. Myoclonus is present in both hands held forward, a bit worse with action, and accompanied by mild past-pointing on the left. Axial negative myoclonic jerks interfere with his walking, while providing sensory input with a guiding hand helps eliminate axial myoclonus. Touching a guard rail provides a similar proprioceptive input. The next patient, a 27-year-old man, developed severe LAS after surviving an arrest provoked by a pulmonary embolism. Severe action myoclonus on holding a cup or spoon prevented him from performing basic activities of living. Profound negative axial myoclonic jerks prevented him from standing even with two-person assist. The next patient, a young woman who developed LAS after an unrecognized esophageal intubation during a gynecologic surgery, was incapacitated by medication-refractory myoclonus. She is shown before and 20 min after ingestion of two glasses of wine, with profound improvement in myoclonus and functional performance. The final patient developed LAS after surviving a cardiopulmonary arrest from spontaneous bilateral pneumothorax. Vocal myoclonus prevented him from communicating, and myoclonus at rest and with action left him completely functionally disabled. He is shown in hospital before and 1 h after ingestion of two grams of sodium oxybate, with profound improvement in myoclonus (MP4 745754 kb)
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Riboldi, G.M. (2022). Posthypoxic Myoclonus and Its Management. In: Frucht, S.J. (eds) Movement Disorder Emergencies. Current Clinical Neurology. Humana, Cham. https://doi.org/10.1007/978-3-030-75898-1_11
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