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Definition of delayed-onset neurologic sequelae: A review article
Alik Dakessian1,2, Zachary Hagen1, Eugenio R Rocksmith3
1Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, MD, United States of America.
Background:
Delayed-onset neurologic sequelae (DNS) is a devastating complication of carbon monoxide poisoning. Despite abundant research studies on DNS, the definition remains unclear, with a wide range of symptoms. This review aims to identify the different symptoms and definitions that have been associated with DNS in available research.
Methods:
For this review, searches were conducted in PubMed and Scopus. Two authors screened research studies by abstract and title, and a third resolved conflicts. After the full-text review, one author extracted the data. Only original full-text research studies in English with a clear definition of DNS were included.
Results:
This review included 127 studies. Signs and symptoms associated with DNS were categorized into twelve groups. The most used symptom categories to define DNS were general neurological and cognitive/learning dysfunctions. Imaging studies, clinical testing, and neuropsychiatric testing used to define DNS were also documented.
Conclusions:
The literature did not consistently define DNS attributed to CO toxicity. Standardizing the definition and diagnostic criteria would benefit clinical research.
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