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1. Which mechanism most directly explains blunted nocturnal dipping (non-dipping/reverse-dipping) in aldosterone-driven hypertension?
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Aldosterone-mediated sodium/volume retention impairs the normal nighttime pressure natriuresis and sympathetic withdrawal that produce the physiologic BP dip
Aldosterone excess accelerates nocturnal melatonin secretion
Aldosterone suppresses nocturnal cortisol secretion via negative feedback on the hypothalamic-pituitary-adrenal axis, triggering compensatory sympathetic surges that raise nighttime BP
Aldosterone excess affects only daytime upright/orthostatic BP
2. Why is 24-hour ABPM preferred over office BP for confirming nocturnal hypertension, dipping status, and BP variability?
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ABPM only measures BP during sleep, making it more convenient than clinic visits
ABPM captures BP continuously across the sleep-wake cycle, revealing nocturnal hypertension, dipping pattern, morning surge, and variability that a single office reading cannot detect, and which independently predict organ damage
ABPM is used mainly to rule out white-coat hypertension by comparing daytime ambulatory readings with clinic BP, and has no additional role in nocturnal phenotyping beyond confirming daytime accuracy
ABPM is less reproducible than home BP monitoring for nocturnal patterns
3. In the phase 3 Bax24 trial, baxdrostat (an aldosterone synthase inhibitor) was assessed by 24-hour ABPM in patients with treatment-resistant hypertension. Compared with placebo at 12 weeks, which result is accurate?
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Baxdrostat produced a placebo-adjusted reduction of approximately 14.0 mmHg in 24-hour ambulatory SBP and 13.9 mmHg in nighttime ambulatory SBP, with effects sustained through early-morning hours
Baxdrostat produced a 24-hour ambulatory SBP reduction of about 2 mmHg with no nocturnal effect
Baxdrostat produced an office SBP reduction only, with no change in ambulatory nighttime BP
Baxdrostat produced a daytime BP reduction with a paradoxical nocturnal BP increase
4. Which ABPM-derived metric is most consistently associated with increased risk of CKD progression, heart failure, stroke, and cardiovascular mortality, independent of office BP control?
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Elevated nocturnal SBP with a non-dipping or reverse-dipping pattern
A single elevated office SBP reading at a routine visit
Isolated BP variability confined to the immediate post-exercise period
White-coat BP elevation with normal out-of-office readings
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