Emerging concepts in acute mountain sickness and high-altitude cerebral edema: from the molecular to the morphological.
Acute mountain sickness (AMS) is a neurological disorder that typically affects mountaineers who ascend to high altitude. The symptoms have traditionally been ascribed to intracranial hypertension caused by extracellular vasogenic edematous brain swelling subsequent to mechanical disruption of the blood-brain barrier in hypoxia. However, recent diffusion-weighted magnetic resonance imaging studies have identified mild astrocytic swelling caused by a net redistribution of fluid from the "hypoxia-primed" extracellular space to the intracellular space without any evidence for further barrier disruption or additional increment in brain edema, swelling or pressure. These findings and the observation of minor vasogenic edema present in individuals with and without AMS suggest that the symptoms are not explained by cerebral edema. This has led to a re-evaluation of the relevant pathogenic events with a specific focus on free radicals and their interaction with the trigeminovascular system.
Bailey
Damian Miles
DM
Neurovascular Research Laboratory, Faculty of Health, Science and Sport, University of Glamorgan, Pontypridd, CF37 1DL, South Wales, UK. dbailey1@glam.ac.uk
Bärtsch
Peter
P
Knauth
Michael
M
Baumgartner
Ralf W
RW
D000208:Acute Disease; D000222:Adaptation, Physiological / Q000502:physiology; D000531:Altitude; D000532:Altitude Sickness / Q000150:complications / Q000209:etiology* / Q000473:pathology / Q000503:physiopathology; D000818:Animals; D001921:Brain / Q000502:physiology / Q000503:physiopathology; D001929:Brain Edema / Q000209:etiology* / Q000473:pathology*; D006801:Humans; D000860:Hypoxia / Q000235:genetics; D008954:Models, Biological; D010100:Oxygen / Q000378:metabolism; D010101:Oxygen Consumption / Q000502:physiology; D017382:Reactive Oxygen Species / Q000378:metabolism; D015398:Signal Transduction / Q000235:genetics / Q000502:physiology
D017382:Reactive Oxygen Species; D010100:Oxygen