Onset | Examples of pathophysiology | |
---|---|---|
Hyperacute | …seconds, minutes, hours… | Traumatic Vascular (haemorrhagic or ischaemic) |
Acute | …hours, days, weeks… | Compressive (abscess, tumour, intervertebral disc)* Inflammatory (including infective and post-infective)† |
Subacute | …days, weeks, months… | Metabolic (eg, B12 deficiency) Compressive Inflammatory |
Chronic | …months, years, decades… | Compressive (eg, spondylotic) Inflammatory (eg, HTLV-1 infection, primary progressive multiple sclerosis) Heredo-degenerative Syringomyelia |