Patrick Lyden
Patrick D. Lyden is an American neurologist, scholar and author who specializes in stroke research. He is a professor of Physiology and Neuroscience and a professor of Neurology at the USC Keck School of Medicine.
Education and early career
Lyden earned a Bachelor of Science in Biochemistry from the University of California, Los Angeles in 1978 and a Doctor of Medicine degree from Baylor College of Medicine in 1981. He began his academic career at the University of California, San Diego in 1987, rising from Assistant Professor in Residence to Associate Professor in Residence, and then to full Professor in Neurosciences. He later held leadership roles at UCSD, including Chief of Neurology and Director of the Stroke Center. He moved to Cedars-Sinai in 2010, where he founded the Comprehensive Stroke Center and served as Chair of Neurology. He also held a long-running association with UCLA before joining USC Keck as a full professor in 2021, after a period as a visiting professor.
Major contributions and research
Lyden is best known for his work in stroke, particularly for helping establish clot-busting therapy. He co-led the National Institute of Neurological Disorders and Stroke (NINDS) t-PA for Acute Stroke Trial, which helped validate t-PA as an effective treatment when given soon after a stroke. He also contributed to training and certifying clinicians in using the NIH Stroke Scale (NIHSS); he authored training videos that earned a Cine Golden Eagle award in 2007.
In the lab and clinic, Lyden studied how to protect the brain during a stroke and how blood clots interact with brain tissue. His work included post-embolic hemorrhage models, findings about how different clot-dissolving drugs compare, and the identification of tenecteplase as a promising alternative to rt-PA in some settings. He explored how GABA-based drugs could protect brain cells and how combining therapies could produce true pharmacological synergy beyond simple dose increases.
Other notable ideas from his research include methods to measure blood–brain barrier leakage, the concept that ischemic tissue produces factors that promote capillary growth around the injury, and the idea that such angiogenesis mainly helps remove dead tissue rather than restore function. He studied thrombin’s role in neuronal death during stroke and showed that thrombin inhibitors could be protective. His team also examined how cooling (hypothermia) affects brain cells after stroke and introduced the concept of differential vulnerability among brain cells to injury, guiding ideas for targeted therapies. He helped lead major efforts to revise preclinical guidelines for stroke research and to promote the protection of the brain during stroke.
Leadership, recognitions and impact
Lyden has held important leadership roles, including Chief of Neurology at UC San Diego (1996–2009), Founding Director of the Comprehensive Stroke Center at Cedars-Sinai (2010–2018), and Chair of the Stroke Council for the American Heart Association (2021–2023). He has received several honors, including the 2024 Neurologist Pioneer Award from the Society for Vascular Neurology and Intervention, and the 2019 William M. Feinberg Award for Excellence in Clinical Stroke from the American Heart Association.
This page was last edited on 2 February 2026, at 07:04 (CET).