Multipoint pacing improves peripheral hemodynamic response: Noninvasive assessment using radial artery tonometry

Area of Science:

• Cardiology
• Biomedical Engineering
• Medical Devices

Background:

• Multipoint™ Pacing (MPP) enhances cardiac resynchronization therapy (CRT) response rates.
• Assessing arterial pressure morphology changes is crucial for evaluating CRT effectiveness.

Purpose of the Study:

• To evaluate the feasibility of noninvasive radial artery tonometry (RAT) for characterizing arterial pressure morphology changes.
• To compare changes in pre-ejection period (PEP) and ejection duration (ED) between conventional CRT and MPP pacing.

Main Methods:

• Noninvasive RAT assessments were performed on 19 patients with MPP-enabled CRT devices.
• Patients underwent randomized pacing protocols comparing conventional biventricular CRT (CONV) with five MPP configurations.
• Pre-ejection period (PEP), ejection duration (ED), and PEP/ED ratio were determined from RAT waveforms and ECG.

Main Results:

• RAT successfully recorded pressure waveforms in 19 patients.
• At least one MPP configuration improved PEP, ED, and PEP/ED in 89% of patients compared to CONV.
• MPP with maximal LV cathode separation and minimal intra-LV delay significantly improved PEP, ED, and PEP/ED versus CONV.

Conclusions:

• Noninvasive RAT is an effective method for characterizing arterial pressure changes during CRT and MPP interventions.
• Optimized MPP configurations, particularly those with wide LV cathode separation, offer significant improvements over conventional CRT.