Essential tremor (ET) is a chronic, progressive neurological disease that can range in severity from almost imperceptible shaking to extremely large amplitude tremor that profoundly impacts the ability to perform numerous activities of daily living. As the disease progresses, tremor increases in severity, a range of different forms of upper limb tremor (e.g., kinetic, postural, intention, and rest) emerge, and the tremor may spread from the arms to the neck, voice, or jaw. In a cohort of ET patients living with tremor for 40 or more years, one-third had tremor in at least two cranial structures, and the proportion of high-amplitude arm tremor reached 20.3% (e.g., while drawing spirals), 33.8% (e.g., while drinking), and 60.8% (e.g., while using a spoon).1 We previously reported an ET patient whose jaw tremor was so severe that the patient suffered cracked teeth.2 The view of ET as seen by many general practitioners, primary care physicians, or general neurologists may be of mild and “benign” cases.3 They may see few severe cases, as these cases may preferentially self-refer to movement disorder neurologists and tertiary referral clinics. Indeed, in these severe cases, the tremor can become quite debilitating and incapacitating. We recently reviewed the published literature and were surprised to find that there were no published videotape examples of severe ET. Hence, while many clinicians may know that ET can become quite severe, they may not have seen this for themselves. To address this gap, here we present several illustrative videos of patients with advanced ET performing different aspects of a movement disorder examination, with the educational intent of tangibly demonstrating severe kinetic, postural, and intention tremor in the arms and hands.
2 Editor: Julian Benito-Leon, Hospital “12 de Octubre”, Spain
3 Funding: This research was supported by the National Institutes of Health Grants R01 NS073872, R01 NS086736, R01 NS088257, and R01 NS094607.
4 Financial Disclosures: None.
5 Conflict of Interest: The authors report no conflicts of interest.
6 Ethics Statement: All videos were taken of recent participants in research studies at Yale University and Columbia University. All studies were approved by the Yale University and Columbia University Institutional Review Boards, and all participants signed written informed consent forms. All the participants consented to publish their videos in professional journals.
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Hernandez, NC and , Louis, ED, Jaw tremor resulting in broken teeth: on the essential tremor spectrum. Tremor Other Hyperkinet Mov 2015;5:354 doi: https://doi.org/10.7916/D8T15339.