Siemens P, Hilger H H, Frowein R A
Department of Medicine, University of Cologne.
Neurosurg Rev. 1989;12 Suppl 1:282-4. doi: 10.1007/BF01790662.
Heart rate variation and the atropine test as an expression of the bulbar parasympathetic activity might complete the clinical examination in the diagnosis of brain death, but are certainly unreliable as confirmatory tests.