Mechanistic Insights From Temporary Pacing in HFpEF

N/ANot Yet RecruitingNCT06467266

Guy's and St Thomas' NHS Foundation Trust10 enrolled

Overview

Heart failure with preserved ejection fraction (HFpEF) is characterised by impaired diastolic function. A recent clinical trial has demonstrated multiple beneficial outcomes in HFpEF patients receiving personalised accelerated pacing from indwelling permanent pacemakers, including symptomatic improvement, objective reductions in NT-proBNP level and AF-burden. The investigators aim to determine the underlying mechanisms behind these documented effects, to investigate the acute intracardiac haemodynamic response to temporary multisite pacing in HFpEF participants and to gain further mechanistic insight with additional haemodynamic, electrical and echocardiographic data collection during temporary pacing in this cohort. This will all provide valuable information towards new potential targets of therapy.

In this research study, the investigators will perform a one-off temporary pacing procedure in the catheter lab at St Thomas' Hospital in patients with heart failure with preserved ejection fraction (HFpEF). During the short procedure, the investigators will pace the heart at different heart rates and from different parts of the heart. The investigators will measure the change in pressure inside the heart in response to each pacing site/mode and rate. Altogether, the investigators aim to find out how different pacing modes and heart rates impact how well the heart fills and pumps in HFpEF. The study will provide valuable information about the underlying mechanisms of pacing in HFpEF, which could significantly influence the future direction of HFpEF management. Specifically, it will help the investigators to understand what types of pacemaker and pacing site or pacing mode may be chosen in HFpEF patients requiring pacing, which accounts for around 20% of all HFpEF patients.

Study Type

INTERVENTIONAL

Allocation

Purpose

BASIC_SCIENCE

Masking

NONE

Enrollment

Eligibility

Sex: ALLMin age: 18 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria: * Participant is willing and able to give informed consent for participation in the study. * Male or Female, aged 18 years or above. * Formal diagnosis of HFpEF as per ESC guidelines * NYHA grade II-IV heart failure symptoms * LVEF ≥50% * Female participants of child-bearing potential must be willing to ensure that they or their partner use effective contraception during the study and for 3 months thereafter * Able (in the Investigators opinion) and willing to comply with all study requirements. * Willing to allow his or her General Practitioner and consultant, if appropriate, to be notified of participation in the study. Exclusion Criteria: * History of persistent or permanent AF * Permanent pacing device in situ * Female participants who are pregnant, lactating or planning pregnancy during the course of the study. * Scheduled elective surgery or other procedures requiring general anaesthesia during the study. * Participant who is terminally ill * Any other significant disease or disorder which, in the opinion of the Investigator, may either put the participants at risk because of participation in the study, or may influence the result of the study, or the participant's ability to participate in the study. * Significant peripheral vascular disease precluding an EP study * A contraindication to anticoagulation * A prosthetic aortic, mitral or tricuspid valve * Significant Aortic valve disease * Known LV thrombus * Insufficient capacity to consent to the study * Participation in other studies with active treatment / investigational arm to avoid bias

Outcomes

Primary Outcomes

Number of participants with changes in left ventricular end diastolic pressure upon accelerated right atrial pacing and conduction system pacing

Measurement of the absolute left ventricular end diastolic pressure (in mmHg) and volume (in milliliter) at real-time during each pacing mode, heart rate and AV delay with a pressure volume loop catheter

Time frame: 30 months

Secondary Outcomes

Number of participants with leftward, downward shift in the LV P-V loop during accelerated RA pacing and CSP, not reproduced by RV pacing

Qualitative assessment of the leftward, downward shift in the left ventricular P-V loop during accelerated right atrial pacing and conduction system pacing, not reproduced by right ventricular pacing

Time frame: 30 months

Number of participants with changes in Echo measures of diastology upon right atrial pacing and conduction system pacing

Measurement of the absolute left ventricular tissue velocity (measured in centimeter/second) with the use of a pulse wave tissue doppler imaging (TDI) signal in the apical four chamber view

Time frame: 30 months

Mechanistic Insights From Temporary Pacing in HFpEF

Overview

Conditions

Interventions

Eligibility

Outcomes

Primary Outcomes

Secondary Outcomes

Central Contacts