Rationale and Design of the Genotype-Blinded Trial of Torasemide for the Treatment of Hypertension (BHF UMOD)

Linsay McCallum, Katriona Brooksbank, Alex McConnachie, Alisha Aman, Stefanie Lip, Jesse Dawson, Iain M MacIntyre, Thomas M MacDonald, David J Webb, Sandosh Padmanabhan, Linsay McCallum, Katriona Brooksbank, Alex McConnachie, Alisha Aman, Stefanie Lip, Jesse Dawson, Iain M MacIntyre, Thomas M MacDonald, David J Webb, Sandosh Padmanabhan

Abstract

Background: Genome-wide association studies have identified single nucleotide polymorphisms (SNPs) near the uromodulin gene (UMOD) affecting uromodulin excretion and blood pressure (BP). Uromodulin is almost exclusively expressed in the thick ascending limb (TAL) of the loop of Henle and its effect on BP appears to be mediated via the TAL sodium transporter, NKCC2. Loop-diuretics block NKCC2 but are not commonly used in hypertension management. Volume overload is one of the primary drivers for uncontrolled hypertension, so targeting loop-diuretics to individuals who are more likely to respond to this drug class, using the UMOD genotype, could be an efficient precision medicine strategy.

Methods: The BHF UMOD Trial is a genotype-blinded, multicenter trial comparing BP response to torasemide between individuals possessing the AA genotype of the SNP rs13333226 and those possessing the G allele. 240 participants (≥18 years) with uncontrolled BP, on ≥1 antihypertensive agent for ≥3 months, will receive treatment with Torasemide, 5 mg daily for 16 weeks. Uncontrolled BP is average home systolic BP (SBP) >135 mmHg and/or diastolic BP >85 mmHg. The primary outcome is the change in 24-hour ambulatory SBP area under the curve between baseline and end of treatment. Sample size was calculated to detect a 4 mmHg difference between groups at 90% power. Approval by West of Scotland Research Ethics Committee 5 (16/WS/0160).

Results: The study should conclude August 2021.

Conclusions: If our hypothesis is confirmed, a genotype-based treatment strategy for loop diuretics would help reduce the burden of uncontrolled hypertension.

Clinical trials registration: https://ichgcp.net/clinical-trials-registry/NCT03354897.

Keywords: NKCC2; blood pressure; furosemide; hypertension; loop-diuretic; uromodulin.

© The Author(s) 2020. Published by Oxford University Press on behalf of American Journal of Hypertension, Ltd.

Figures

Graphical Abstract
Graphical Abstract
Figure 1.
Figure 1.
BHF UMOD study flow chart. Abbreviations: HBP, home blood pressure; ECG, electrocardiogram; HBPM, home blood pressure monitoring.

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