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Fig. 1. —Diagram shows decision tree comparing natural history of
medication-resistant hypertension (MRH) with other evaluation and treatment
strategies and events occurring within the first year after presentation.
Treatment response ranges from improvement (diastolic blood pressure, [DBP],
90 mm Hg), to some improvement (DBP, 90–110 mm Hg), to no improvement
(DBP > 110 mm Hg). hx = history, tx = therapy, CTA = CT angiography, MRA =
MR angiography, CA = conventional angiography, NRD = contrast nephropathy
requiring dialysis, Senscta = sensitivity of CT angiography, sensangio =
sensitivity of conventional angiography, angio = angiography.
