Abstract
Hypertension is highly prevalent and one of the most frequent chronic diseases worldwide. Approximately 10 % of patients with high blood pressure are resistant to drug treatment in the presence of three or more antihypertensive drugs of different classes, including a diuretic, at maximal or the highest tolerated dose. Sympathetic overstimulation is one of the key components of resistant hypertension. Percutaneous catheter-based transluminal renal ablation (RDN) has emerged as a new approach to achieve sustained blood pressure reduction in patients with drug-resistant hypertension. Currently established radiofrequency- or ultrasound-based devices thermally damage the perivascular tissue of the renal artery interrupting the efferent and afferent sympathetic nerve bundles. Several position papers summarized the current evidence, unmet needs, and practical recommendations for the application of this therapeutic strategy in clinical practice. Given that there is no established intra-procedural control of ablation success, interventionalists have to be familiar with the aspects related to the anatomy and imaging of the renal arteries, the distribution of renal sympathetic fibers, the special equipment necessary for RDN, and the procedural details in order to maximize the success and minimize potential complications. This chapter summarizes the clinical background of essential hypertension, in particular resistant hypertension, currently published or presented data, and technical aspects of renal denervation. In 2013, commercially available (CE marked) renal denervation devices are described in detail.
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Abbreviations
- Afferent renal nerves:
-
Nerves travelling from the kidney to the brain.
- Ambulatory blood pressure measurement (ABPM):
-
24-h Holter blood pressure measurement. Values are lower than office-based blood pressure values and allow excluding pseudo-resistant patients. Normal value ≤ 130/85mmHg.
- Efferent renal nerves:
-
Nerves travelling from the brain to the kidney.
- Office-based blood pressure:
-
Mean of three blood pressure measurements taken in a sitting position after 10min of rest. Normal value ≤ 140/90mmHg.
- Percutaneous renal denervation:
-
Minimally invasive therapy (endovascular) targeting the renal sympathetic afferent and efferent nerves based on thermal or drug destruction of the nerve fibers.
- Pseudo-resistance:
-
Hypertension which is probably related to poor medication adherence situational-evoked blood pressure elevation (white coat hypertension), or suboptimal drug combination.
- Resistant hypertension:
-
Blood pressure resistant to drug treatment defined as blood pressure (>140/90mmHg > 130/80mmHg in patient with chronic kidney disease) despite the use of at least three antihypertensive agents of different classes including a diuretic, at maximum or highest tolerated doses.
- Secondary hypertension:
-
Hypertension caused by an organic disorder such as renal artery stenosis coarctation, and other causes which are potentially reversible by organ-specific therapy.
- Symplicity HTN-1 study:
-
The initial proof-of-concept study investigating patients with severe resistant hypertension defined as uncontrolled hypertension (office SBP ≥160mmHg) despite the use of three or more antihypertensive drugs (one of which is a diuretic) at the highest tolerated and recommended doses, with the best achievable adherence to medical treatment.
- Symplicity HTN-2 study:
-
A multicenter prospective, randomized, controlled trial comparing radiofrequency-based renal denervation with best medical therapy in patients with severe resistant hypertension, defined as uncontrolled hypertension (office SBP ≥ 160mmHg) despite the use of three or more antihypertensive drugs (one of which is a diuretic) at the highest tolerated and recommended doses.
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Zeller, T., Tsioufis, C., Mahfoud, F. (2015). Renal Artery Denervation. In: Lanzer, P. (eds) PanVascular Medicine. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-37078-6_125
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DOI: https://doi.org/10.1007/978-3-642-37078-6_125
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