Key result
Guanethidine plasma levels ≥8 ng/ml predict adrenergic blockade despite high interindividual dose variation.
Why the study?
The relationship between plasma guanethidine levels and adrenergic blockade in hypertensive patients was not well characterized.
Does guanethidine plasma concentration correlate with adrenergic blockade in hypertensive patients?
Comparison
Plasma guanethidine levels related to presence or absence of adrenergic blockade
Design
Observational study measuring plasma levels and adrenergic blockade responses
Authors
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Plasma monitoring may address guanethidine dose variation in hypertension; leaves open whether it improves outcomes in prospective trials.
Observational (n=17)
Does guanethidine plasma concentration correlate with adrenergic blockade in hypertensive patients?
p-value: p=<0.0001
Adrenergic blockade by guanethidine occurs at plasma levels of 8 ng/ml or higher, suggesting that large interindividual variations in dose requirements are driven by pharmacokinetics rather than differing plasma level requirements.
Walter et al. (1975) conducted an observational in Hypertension (n=17). Guanethidine plasma levels was evaluated on Adrenergic blockade (venous reflex response to Valsalva maneuver or deep breath) (p=<0.0001). Guanethidine plasma levels ≥8 ng/ml achieved adrenergic blockade, with a linear relationship between dose and plasma concentration (p<0.0001) despite a 6-fold interindividual variation.
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