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8 Cards in this Set
- Front
- Back
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what happens normally with BP when standing up?
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500-700mls of blood is shifted to lower body - decreasing central blood volume and arterial pressure
normally this is transient and is corrected by normal regulatory machanisms |
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what happens normally with BP when standing up with orthostatic/postural hypotension?
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-absence of normal circulatory reflexes, or low blood volume
-reduced cardiac output and cerebral perfusion leading to dizziness/syncope |
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main causes of postural hypotension (5)
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-reduced blood volume
-drug-induced hypotension -altered vascular responses associated with aging -bed-rest -ANS dysfunction |
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tell me more about
main causes of postural hypotension -REDUCED BLOOD VOLUME -drug-induced hypotension -altered vascular responses associated with aging -bed-rest -ANS dysfunction |
-leads to reduced cardiac output
-caused by e.g. diuretics, diaphoresis, V+D, prolnged bed rest |
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tell me more about
main causes of postural hypotension -reduced blood volume -DRUG-INDUCED HYPOTENSION -altered vascular responses associated with aging -bed-rest -ANS dysfunction |
-antihypertensives and psychtropics
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tell me more about
main causes of postural hypotension -reduced blood volume -drug-induced hypotension -ALTERED VASCULAR RESPONSES ASSOCIATED WITH AGING -bed-rest -ANS dysfunction |
-diminished ability to increase HR, SV, PVR
-reduced function of skeletal muscle pumps -reduced blood volume -post prandial drop in BP increases with age |
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tell me more about
main causes of postural hypotension -reduced blood volume -drug-induced hypotension -altered vascular responses associated with aging -BED-REST -ANS dysfunction |
-3-4 days - reduced plasma volume
-2 weeks - also loss of vascular and skeletal muscle tone |
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tell me more about
main causes of postural hypotension -reduced blood volume -drug-induced hypotension -altered vascular responses associated with aging -bed-rest -ANS DYSFUNCTION |
common in peripheral neuropathies seconday to
-diabetes -injury/disease of spinal cord -CVA -Parkinson's |
