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Cataplexy--clinical aspects, pathophysiology and management strategy.

ABSTRACT: Cataplexy is the pathognomonic symptom of narcolepsy, and is the sudden uncontrollable onset of skeletal muscle paralysis or weakness during wakefulness. Cataplexy is incapacitating because it leaves the individual awake but temporarily either fully or partially paralyzed. Occurring spontaneously, cataplexy is typically triggered by strong positive emotions such as laughter and is often underdiagnosed owing to a variable disease course in terms of age of onset, presenting symptoms, triggers, frequency and intensity of attacks. This disorder occurs almost exclusively in patients with depletion of hypothalamic orexin neurons. One pathogenetic mechanism that has been hypothesized for cataplexy is the activation, during wakefulness, of brainstem circuitry that normally induces muscle tone suppression in rapid eye movement sleep. Muscle weakness during cataplexy is caused by decreased excitation of noradrenergic neurons and increased inhibition of skeletal motor neurons by γ-aminobutyric acid-releasing or glycinergic neurons. The amygdala and medial prefrontal cortex contain neural pathways through which positive emotions probably trigger cataplectic attacks. Despite major advances in understanding disease mechanisms in cataplexy, therapeutic management is largely symptomatic, with antidepressants and γ-hydroxybutyrate being the most effective treatments. This Review describes the clinical and pathophysiological aspects of cataplexy, and outlines optimal therapeutic management strategies.

SUBMITTER: Dauvilliers Y

PROVIDER: S-EPMC8788644 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:PurposeToday's clinical trial partnerships frequently join multi-disciplinary investigators and stakeholders, from different countries and cultures, to conduct research with a broad array of goals. This diversity, while a strength, can also foster divergent views about priorities and what constitutes success, thereby posing challenges for management, operations, and evaluation. As a sponsor and partner in such collaborations, we seek to assist and support their development and implementation of sound research strategies, to optimize their efficiency, sustainability, and public health impact. This report describes our efforts using an adaptation of the well-established Kaplan-Norton strategy management paradigm, in our clinical trials setting. We share findings from our first test of the utility and acceptance of this approach for evaluating and managing research strategies in a collaborative clinical research partnership.ResultsFindings from pilot studies and our first implementation in an ongoing clinical research partnership in Liberia, provide initial support for our hypothesis that an adapted version of the Kaplan-Norton strategy management model can have use in this setting. With leadership from within the partnership, analysis artifacts were gathered, and assessments made using standardized tools. Practical feasibility, resonance of the findings with partners, and convergence with other empirical assessments lend initial support for the view that this approach holds promise for obtaining meaningful, useable results for assessing and improving clinical research management.Conclusions and implicationsEngaged leadership, thoughtful timing to align with partnership planning cycles, support for the process, and an eye towards the collaboration's long-term goals appear important for developing model understanding and practice. Skepticism about evaluations, and unease at exposing weaknesses, may hinder the effort. Acceptance of findings and associated opportunities for improvement by group leadership, support a growing sense of validity. Next steps aim to test the approach in other partnerships, streamline the methodology for greater ease of use, and seek possible correlations of strategy management assessments with performance evaluation. There is hardly a better example than the COVID-19 pandemic, to spotlight the need for efficient and effective clinical research partnerships to address global health challenges. While heartened by the collaborative spirit driving the effort so far, we cannot let our enthusiasm lull us into thinking that nobility of purpose or an abundance of good will is sufficient. Careful monitoring and adjustment of clinical research strategy in response to changes (e.g., demographics, pathogen evolution, research acceptance, political and cultural environments) are vital to making the needed adjustments that can guide these programs toward successful outcomes. We hope that our work can raise awareness about the importance, relevance, and feasibility of sound strategy management in clinical research partnerships, especially during this time when there is so much at stake.

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Cataplexy--clinical aspects, pathophysiology and management strategy.

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