Reconstruction of brachial pressure from finger arterial pressure using the Finometer with return-to-flow calibration reduced systolic pressure differences to 3.1 ± 7.6 mmHg, meeting AAMI criteria.
Observational (n=37)
Does the Finometer accurately reconstruct brachial pressure from non-invasive finger arterial pressure compared to intra-brachial pressure in patients after cardiac catheterization?
The Finometer with individual RTF calibration accurately reconstructs brachial pressure from finger arterial pressure, meeting AAMI requirements.
Objective To evaluate three methods aimed at the reconstruction of brachial pressure from non-invasive finger arterial pressure measurements as implemented in the Finometer™, (FMS, Finapres Measurement Systems, Arnhem, Netherlands), the successor to the Finapres™ (TNO Biomedical Instrumentation, Amsterdam, Netherlands). Methods Finger arterial pressure (FinAP) may differ from intra-brachial pressure (BAP). Pulse shape differences are removed by applying a generalized waveform filter. Pressure level differences are corrected by a generalized level correction equation using filtered systolic and diastolic levels and by level calibration, which uses an additional return-to-flow (RTF) systolic pressure measurement on the ipsilateral upper arm for an individual calibration of the reconstructed brachial pressure. Validation These methods were validated in 37 subjects, aged 41 to 83 years after a cardiac catheterization procedure. Intra-brachial and Finometer pressures were recorded simultaneously. Finometer pressures were compared after application of waveform filtering and level correction (flcAP), and after an additional RTF calibration (reBAP). Results Finger arterial systolic, diastolic and mean pressures for the group differed from BAP by −9.7 ± 13.0, −11.6 ± 8.0 and −16.3 ± 7.9 mmHg (mean ± SD) respectively. Similarly flcAP differed by −1.1 ± 10.7, −0.2 ± 6.8 and −1.5 ± 6.6 mmHg and reBAP differed by 3.1 ± 7.6, 4.0 ± 5.6 and 2.7 ± 4.7 mmHg. Conclusion Reconstruction of BAP from FinAP as implemented in the Finometer reduces the pressure differences, with an individual RTF calibration to well within AAMI requirements.
Guelen et al. (Sat,) conducted a observational in Post-cardiac catheterization (n=37). Finometer (reconstructed brachial pressure) vs. Intra-brachial pressure (BAP) was evaluated on Difference between reconstructed brachial pressure and intra-brachial pressure. Reconstruction of brachial pressure from finger arterial pressure using the Finometer with return-to-flow calibration reduced systolic pressure differences to 3.1 ± 7.6 mmHg, meeting AAMI criteria.