Enhancing the Clinical Utility of Renal Denervation Through Efficient Physiologic Monitoring

Renal denervation has limited clinical utility due to the lack of methods for measuring renal sympathetic outflow. Previous assessments of sympathetic vasomotion required lengthy recordings, making them unsuitable for many clinical scenarios. This study explored whether shorter data segments could effectively capture and assess sympathetic vasomotion, aiding decision-making for renal denervation.

The research involved ten swine that underwent unilateral surgical renal denervation. The scientists then performed four rounds of catheter-based denervation of the opposite kidney. Sympathetic vasomotion was measured using a time-varying arterial pressure-resistive renal blood flow transfer function obtained before and after each ablation. Short data segments spanning one to fourteen minutes were analyzed and compared to 15-minute sympathetic vasomotion scores.

Agreement between the short and long recordings improved rapidly up to about four minutes, plateauing thereafter. The four-minute segments had an intraclass correlation coefficient of 0.94, closely matched group-level statistical results, and maintained intraprocedural denervation decisions. The precision of individual-level measurements continued to improve with longer recordings, with 65% of scores within a quarter of the average difference at four minutes and 96% at ten minutes.

In summary, four-minute data segments offer a practical minimum recording duration for group comparisons or paired within-individual decisions, such as confirming that an innervated kidney has become denervated during a procedure. While single scores are less precise, ten-minute recordings enhance accuracy for preprocedural patient selection. Further studies are necessary to evaluate the feasibility of this technology in clinical settings and its potential to support procedural feedback and inform patient selection.