Splanchnic vasoconstriction may contribute to decompensation of chronic heart failure (HF) via volume redistribution from the splanchnic vascular bed to the central compartment. This is a sympathetically mediated reflex and can be interrupted through a splanchnic nerve block (SNB). We hypothesize that interruption of the efferent/afferent innervation of the splanchnic vasculature will decrease cardiac congestion in patients presenting with HF. Based on preliminary safety and efficacy data in acute and chronic heart failure patients with temporary (<24 h) SNB. Now we will apply a prolonged SNB in chronic heart failure patients using a long acting agent. We will test the effects of SNB on long term exercise capacitance.
Activation of splanchnic nerves results in vasoconstriction and reduces splanchnic capacitance, therefore recruiting blood volume into the central circulation. In heart failure, a reduced splanchnic vascular capacitance could be the mechanism underlying symptoms of exercise intolerance and could predispose to rapid decompensation with external fluid intake or retention. A compromised vascular reservoir is likely unable to buffer shifts of fluid and actively contributes to the acute or chronic expulsion of fluid from the splanchnic vascular compartment to the central thoracic compartment. The redistribution of blood volume into the central circulation may lead to a sudden rise in pulmonary and left-sided cardiac pressures in HF. This makes the splanchnic vascular compartment an attractive target in heart failure. Our preliminary proof-of-concept work in patients with acute decompensated and chronic heart failure showed promise for the concept of splanchnic nerve modulation in heart failure. In a series of two small first-in-human studies for acute decompensated heart failure (N=13) (NCT02669407) and chronic heart failure (N=17) (NCT03453151), we found that a splanchnic nerve block (SNB) with lidocaine (90 min duration of action) and ropivacaine (24 hours duration of action) acutely reduced resting and exercise-induced intra-cardiac filling pressures, associated with improved patient symptoms and functional capacity.
The present study will be a prospective open-label pilot study to help establish feasibility, safety and enable dose finding for botulinumtoxin. Following a baseline invasive (right heart catheterization) cardiopulmonary exercise testing (CPX) patients will undergo unilateral celiac plexus block, followed by repeat hemodynamic testing. Functional testing at baseline and follow up will be supplemented by measures of blood volume and autonomic tone.
| Condition | Chronic Heart Failure |
|---|---|
| Treatment | Splanchnic nerve block |
| Clinical Study Identifier | NCT04575428 |
| Sponsor | Duke University |
| Last Modified on | 29 July 2023 |
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