Renal resistive index for resistant hypertension

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In a recent issue of the journal, Kintis et al.[1] examined the association of renal haemodynamics with resistant hypertension (RHTN). Specifically, the authors found that patients with RHTN had greater levels of renal resistive index (RRI) compared with patients with controlled hypertension. Based on the findings, they concluded that a greater RRI may help identifying RHTN patients. However, the levels of RRI could have reflected the levels of pulse pressure (PP), the difference between the SBP and DBP readings.

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