Key result
Idiopathic orthostatic hypotension and multiple system atrophy are associated with elevated platelet alpha-receptors versus controls.
Why the study?
The role of alpha-adrenergic receptor function in different orthostatic hypotension syndromes and its relation to supine hypertension was unclear.
Do patients with orthostatic hypotension syndromes have abnormal alpha-adrenergic receptor function compared to normotensive controls?
Population
Patients with IOH, MSA, SOH and normotensive controls
Comparison
Orthostatic hypotension syndromes vs normotensive controls
Design
Case-control study
Authors
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May link receptor upregulation to supine hypertension in IOH/MSA; hypothesis-generating and requires prospective confirmation before clinical consideration.
Case-Control
Do patients with orthostatic hypotension syndromes have abnormal alpha-adrenergic receptor function compared to normotensive controls?
Increased alpha-receptor numbers and altered cAMP production in IOH and MSA may contribute to the supine hypertension observed in these specific orthostatic hypotension syndromes.
Kafka et al. (1984) conducted a case-control in Orthostatic hypotension syndromes. Orthostatic hypotension syndromes (IOH, MSA, SOH) vs. Normotensive controls was evaluated on Alpha-adrenergic receptor function in platelets. Patients with idiopathic orthostatic hypotension or multiple system atrophy had more platelet alpha-receptors than normotensive controls, while those with sympathotonic orthostatic hypotension did not.
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