Ms. Nyan Flannigan Profile

Nyan Flannigan

at Musashi Auto Parts Canada

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SPIE Journal Paper | 17 November 2022 Open Access

Assessing jugular venous compliance with optical hemodynamic imaging by modulating intrathoracic pressure

Robert Amelard, Nyan Flannigan, Courtney Patterson, Hannah Heigold, Richard Hughson, Andrew Robertson

JBO, Vol. 27, Issue 11, 116005, (November 2022) https://doi.org/10.1117/12.10.1117/1.JBO.27.11.116005

KEYWORDS: Veins, Optical imaging, Hemodynamics, Heart, Signal attenuation, Ultrasonography, Blood, Compliance, Biomedical optics, Optical sensing

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SignificanceThe internal jugular veins (IJV) are critical cerebral venous drainage pathways that are affected by right heart function. Cardiovascular disease and microgravity can alter central venous pressure (CVP) and venous return, which may contribute to increased intracranial pressure and decreased cardiac output. Assessing jugular venous compliance may provide insight into cerebral drainage and right heart function, but monitoring changes in vessel volume is challenging.AimWe investigated the feasibility of quantifying jugular venous compliance from jugular venous attenuation (JVA), a noncontact optical measurement of blood volume, along with CVP from antecubital vein cannulation.ApproachCVP was progressively increased through a guided graded Valsalva maneuver, increasing mouth pressure by 2 mmHg every 2 s until a maximum expiratory pressure of 20 mmHg. JVA was extracted from a 1-cm segment between the clavicle and midneck. The contralateral IJV cross-sectional area (CSA) was measured with ultrasound to validate changes in the vessel size. Compliance was calculated using both JVA and CSA between four-beat averages over the duration of the maneuver.ResultsJVA and CSA were strongly correlated (median and interquartile range) over the Valsalva maneuver across participants (r = 0.986, [0.983, 0.987]). CVP more than doubled on average between baseline and peak strain (10.7 ± 4.4 vs. 25.8 ± 5.4 cmH2O; p < 0.01). JVA and CSA increased nonlinearly with CVP, and both JVA- and CSA-derived compliance decreased progressively from baseline to peak strain (49% and 56% median reduction, respectively), with no significant difference in compliance reduction between the two measures (Z = − 1.24, p = 0.21). Pressure-volume curves showed a logarithmic relationship in both CSA and JVA.ConclusionsOptical jugular vein assessment may provide new ways to assess jugular distention and cardiac function.

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