Direct HIS/LBB Pacing as an Alternative to Biventricular Pacing in Patients With HFrEF and a Typical LBBB.

Study Overview
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Brief Summary
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The study will investigate the feasibility of using direct HIS pacing or left bundle branch pacing (LBB pacing) as an alternative to biventricular pacing in patients with symptomatic heart failure and an ECG with a typical left bundle branch block pattern.

Detailed Description
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Biventricular pacing has for more than a decade been standard of care for patients with HFrEF, LVEF < 35%, NYHA II-IV despite optimal medical treatment and an ECG with left bundle branch block (LBBB). However, it is not always ideal because of several drawbacks such as phrenic nerve capture, inability to reach late activated areas and many more. Direct HIS pacing can in many cases capture the left bundle and provide normal electrical activation of the left ventricle but sometimes with high pacing thresholds. Recently direct left bundle branch pacing has shown promise with synchronous activation of the left ventricle at low pacing thresholds. In the present study we randomize 125 patients in one center to either conventional CRT (45 patients) or HIS/LBB pacing (80 patients). In the HIS/LBB arm, direct HIS-pacing is attempted first but if its not possible or the pacing threshold for capturing the left bundle branch is > 2.5 V at 1 ms we switch to placing a LBB-lead. Power calculation for non-inferiority: With the 50 patients in the first His Alternative study (25 Biv-CRT og 25 His-CRT) we observed a fall in systolic volumes of 34% and 46% with a standard deviation of 13-16%. Using these numbers it would take at least 108 patients to be 90% sure that the lower limit of a one-sided 97.5% confidence interval (equal to a 95% two-sided confidence interval) would be over the non-inferiority limit of -10%.

Official Title
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Direct HIS/LBB Pacing as an Alternative to Biventricular Pacing in Patients With Symptomatic Heart Failure Despite Optimal Medical Treatment and an ECG With a Typical Left Bundle Branch Block Pattern.

Conditions
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Heart Failure, Left Bundle-Branch Block

Intervention / Treatment
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* Device: HIS/LBB pacing
* Device: LV pacing


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients over 18 years of age, ischemic or non-ischemic cardiomyopathy with LVEF ≤ 35% assessed by echocardiography, NYHA class II-IV heart failure symptoms despite optimal medical treatment and Either planned new implantation of a biventricular pacing system (CRT-P or CRT-D), where the ECG is with sinus rhythm and a typical left bundle branch block (see definition below) Or planned upgrade of an existing pacemaker or ICD to a biventricular pacing system (CRT-P or CRT-D), where the ECG is with sinus rhythm and a typical left bundle branch block or there has been> 90% right ventricular pacing from an existing pacemaker for at least 2 months prior to enrollment Signed informed consent Typical left bundle branch block: QRS width > 130 msec for women and > 140 msec for men QS or rS pattern in leads V1 and V2, and mid-QRS plateau phase with or without extras in at least 2 of leads V1, V2, V5, V6, I, and aVL Exclusion Criteria: Existing biventricular pacing system Permanent atrial fibrillation Severe renal failure with eGFR < 30 ml/min AMI or CABG within the last three months The patient does not want to participate

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: HIS/LBB pacing<br>In this arm a right ventricular (RV) lead or implantable cardioverter defibrillator (ICD) lead is placed first and then implantation of a HIS-pacing lead is attempted. If it is not possible to find and pace HIS, to correct the LBBB or the threshold for correcting the LBBB is > 2.5 V at 1 ms, implantation of a LBB-pacing lead is attempted instead. If that is not possible either, a left ventricular (LV) lead is implanted. | Device: HIS/LBB pacing<br>* 3830 lead to HIS or LBB<br>|
| Active Comparator: LV pacing<br>In this arm an RV-lead or ICD-lead is placed first and then implantation of a LV-pacing lead is attempted. If this is not possible due to anatomical difficulties (no coronary sinus (CS) access, no available branches other than v cordis anterior or v cordis media) or electrical difficulties (no capture below 4 V at 1.0 msec or phrenic nerve stimulation < 2x pacing threshold), implantation of a HIS-pacing lead is attempted instead. If that is not possible or the threshold for correcting the LBBB is > 2.5 V at 1 ms, implantation of a LBB-pacing lead is attempted instead. | Device: LV pacing<br>* LV lead in a CS branch<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in Left ventricular end-systolic volume | Echocardiographic response after 6 months defined as decrease in left ventricular systolic volume of ≥ 15% of baseline | 6 months | 
| Success rate of implanting a HIS-bundle lead with capture of the left bundle branch or a LBB-lead with narrowing of QRS | The success rate of implanting a pacing lead to the HIS-bundle with capture of the left bundle at a threshold < 2.5 V at 1 ms or implantation of a LBB lead with narrowing of the QRS duration and maintaining this effect at 6 month follow-up | 6 months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in LVEF and left ventricular chamber dimensions | Echocardiographic response assessed by chamber dimensions and LVEF on a continuous scale | 6 months | 
| Change in 6-min hall-walk test | Functional response after 6 months defined as an increase in 6-min walking distance of ≥ 20% of the initial value | 6 months | 
| Change in NYHA class | Symptomatic response after 6 months defined as a fall in NYHA class of ≥ 1 | 6 months | 
| Change in Minnesota Living with Heart Failure score | Change in well-being after 6 months defined as a decrease in Minnesota Living With Heart Failure score of ≥ 15% of baseline | 6 months | 
| Shortening of QRS duration | Shortening the duration of the QRS complex defined as the widest paced QRS complex rated at 12-lead ECG after 6 months | 6 months | 
| Change in NT-pro BNP value | Change in NT-pro BNP value | 6 months | 
| Complications | Device-related complications (periprocedural: electrode reoperation, pneumothorax, hemothorax, pericardial bleeding/tamponade and later (after 30 days post implantation): LV/HIS electrode reoperation, change of device due to battery depletion and infection requiring extraction). | 6 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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left bundle branch block, HIS-pacing, LBB-pacing, left bundle branch pacing