BBC: Some people are unable to lower their blood pressure to healthy levels by taking diuretics, ACE inhibitors, or other antihypertensive drugs. Now, as the BBC’s Michelle Roberts reports, radiation therapy might provide an alternative. Murray Esler of the Baker IDI Heart and Diabetes Institute in Melbourne, Australia, and his collaborators have found that radio waves, when directed at the kidney via a catheter, destroy certain nerves that would otherwise signal blood vessels to constrict. The reduction in systolic blood pressure observed in trials is a modest 10 mmHg, but it was achieved without apparent side effects.