Spleen Stiffness as a Measure to Assess the REsponse to β Blocker Therapy (SPARE-B)

Overview

HVPG is the gold standard for measurement of the presence and severity of portal hypertension. Clinically Significant Portal Hypertension (CSPH) is defined as HVPG ≥ 10 mmHg. Reducing the HVPG by use of non-selective beta blockers has been associated with reduced risk of variceal hemorrhage, ascites, SBP and thus has a positive effect on survival. Response to Beta blocker therapy is defined as a reduction of HVPG by 10% or to ≤ 12 mmHg. HVPG is an invasive method of assessment of portal pressures, with lack of availability at many centres. While non-invasive tests to predict CSPH have been defined, predicting response to beta-blockers non-invasively is an unmet clinical need. The aim of this study is to use splenic stiffness measurement, a non-invasive test, as a surrogate to assess the response of HVPG to beta blocker therapy.

Aim and Objective: To evaluate change in splenic stiffness measurement as a surrogate for response to non-selective beta blockers in patients with high-risk esophageal varices. Primary objectives: To evaluate the diagnostic accuracy of change in splenic stiffness to predict HVPG responders to beta-blockers at 4 weeks \- Study population: All patients aged ≥ 18 years and ≤ 70 years presenting to Institute of Liver and Biliary Sciences, New Delhi with high-risk esophageal varices upon presentation and are giving written consent for participation in the study. * Study design - Single center, Prospective, observational study. * Study period - 1 year * Sample size - We are enrolling 130 patients in the study * Intervention - Carvedilol will be initiated to all patients with high-risk esophageal varices (in the absence of any contraindications) at a dose of 3.125mg BD and titrated to the maximum tolerable dose within 7 days. * Monitoring and assessment - * Investigations - performed at Baseline 1. CBC, RFT, LFT, PT/INR, vWF-Ag, HbA1c 2. Collagen markers: Procollagen 3 peptide, tissue inhibitor of matrix metalloproteinase 1, Hyaluronic acid 3. ECG 4. 2D Echocardiography 5. CECT Whole Abdomen 6. Splenic stiffness measurement 7. Liver stiffness measurement 8. Upper GI endoscopy 9. HVPG * Investigations - performed at 1 month of maximum tolerable dose of Carvedilol 1. CBC, RFT, LFT, PT/INR, vWF-Ag 2. Collagen markers: Procollagen 3 peptide, tissue inhibitor of matrix metalloproteinase 1, Hyaluronic acid 3. ECG 4. Splenic stiffness measurement 5. Liver stiffness measurement 6. HVPG * Adverse effects (of carvedilol) 1. Allergy 2. Light headedness 3. Exercise intolerance 4. Fatigue 5. Chest tightness Stopping rule - Development of variceal bleed Expected outcome of the project: Change in splenic stiffness will correlates with change in HVPG and can reliably predict response to non-selective beta blockers in patient with high-risk esophageal varices.