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Renal denervation: Not as easy as it looks
1Baker IDI Heart and Diabetes Institute, Post Office Box 6492, St. Kilda Road Central, Melbourne, Victoria, Australia.
Science Translational Medicine
|May 1, 2015
Summary
Renal sympathetic denervation for hypertension shows limited effectiveness. This is because radiofrequency energy delivery is suboptimal due to nerve location and anatomical variations in the renal artery.
Area of Science:
- Cardiovascular medicine
- Interventional cardiology
- Nephrology
Background:
- Hypertension is a major global health concern.
- Renal sympathetic denervation (RSD) is an emerging treatment for resistant hypertension.
- Previous studies suggest variable efficacy of RSD.
Purpose of the Study:
- To investigate the reasons behind the limited effectiveness of renal sympathetic denervation using intravascular radiofrequency catheters in hypertensive patients.
- To analyze the impact of anatomical variations on radiofrequency energy delivery during RSD.
Main Methods:
- Utilized intravascular radiofrequency catheters for renal sympathetic denervation in hypertensive patients.
- Analyzed the spatial relationship between applied radiofrequency energy and renal artery nerve location.
- Examined the influence of regional tissue anatomy on energy distribution and temperature gradients.
Main Results:
- Radiofrequency energy was often applied to areas of the renal artery distant from the target nerves.
- Regional anatomical variations significantly distorted energy distribution and temperature gradients.
- These factors contributed to the anticipated lower-than-expected effectiveness of the procedure.
Conclusions:
- The efficacy of current renal sympathetic denervation techniques is limited by suboptimal energy delivery.
- Anatomical factors within the renal artery impede effective nerve ablation.
- Further refinement of RSD technology and patient selection is necessary to improve outcomes.
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