Journal of clinical monitoring and computing
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J Clin Monit Comput · Feb 2024
Video plethysmography for contactless measurement of respiratory rate in surgical patients.
The accurate recording of respiratory rate (RR) without contact is important for patient care. The current methods for RR measurement such as capnography, pneumography, and plethysmography require patient contact, are cumbersome, or not accurate for widespread clinical use. Video Plethysmography (VPPG) is a novel automated technology that measures RR using a facial video without contact. ⋯ These results did not change with the ethnicity of patients. The success rate of the VPPG technology was 99.1%. Contactless RR monitoring of surgical patients at a hospital setting using VPPG is accurate and feasible, making this technology an attractive alternative to the current approaches to RR monitoring. Future developments should focus on improving reliability of the technology.
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J Clin Monit Comput · Feb 2024
Comparative performance of stimpod electromyography with mechanomyography for quantitative neuromuscular blockade monitoring.
The purpose of this study was to compare the Stimpod electromyograph neuromuscular blockade monitor to mechanomyography, which is widely considered to be the reference standard. ⋯ The electromyograph produced results that were comparable to the mechanomyograph.
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J Clin Monit Comput · Feb 2024
Effects of the intermittent intrapulmonary deflation technique on expiratory flow limitation: an in vitro study.
The intermittent intrapulmonary deflation (IID) technique is a recent airway clearance technique that intends to delay the onset of expiratory flow limitation (EFL) during exhalation. We showed in a previous study that IID increased the expiratory volume of COPD patients compared to quiet breathing and positive expiratory pressure (PEP) therapy. We hypothesized that it was due to the attenuation of the EFL. ⋯ The IID and PEP attenuate EFL and increase exhaled volume in the in vitro model.
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Develop a signal quality index (SQI) for the widely available peripheral venous pressure waveform (PVP). We focus on the quality of the cardiac component in PVP. We model PVP by the adaptive non-harmonic model. ⋯ An exterior validation of SQI achieves accuracy 0.87 and F1 0.92; an exterior validation of the SVM model achieves accuracy 0.95 and F1 0.96. The developed SQI has a convincing potential to help identify high quality PVP segments for further hemodynamic study. This is the first work aiming to quantify the signal quality of the widely applied PVP waveform.
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J Clin Monit Comput · Feb 2024
The effects of respiratory rate and tidal volume on pulse pressure variation in healthy lungs-a generalized additive model approach may help overcome limitations.
Pulse pressure variation (PPV) is a well-established method for predicting fluid responsiveness in mechanically ventilated patients. The predictive accuracy is, however, disputed for ventilation with low tidal volume (VT) or low heart-rate-to-respiratory-rate ratio (HR/RR). We investigated the effects of VT and RR on PPV and on PPV's ability to predict fluid responsiveness. ⋯ We did not demonstrate any benefit of GAM-derived PPV in predicting fluid responsiveness. Trial registration: ClinicalTrials.gov, reg. March 6, 2020, NCT04298931.