Journal of clinical monitoring and computing
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J Clin Monit Comput · Dec 2024
Electrical cardiometry for non-invasive cardiac output monitoring: a method comparison study in patients after coronary artery bypass graft surgery.
Cardiac output can be estimated non-invasively by electrical cardiometry with the ICON® monitor (Osypka Medical GmbH, Berlin, Germany). Conflicting results have been reported regarding the cardiac output measurement performance of electrical cardiometry. In this prospective method comparison study, we compared cardiac output measured using electrical cardiometry (EC-CO; test method) with cardiac output measured using intermittent pulmonary artery thermodilution (PATD-CO; reference method) in patients after coronary artery bypass graft (CABG) surgery. ⋯ The concordance rate for cardiac output changes was 48%. In this study, the agreement between EC-CO and PATD-CO was not clinically acceptable in patients after CABG surgery. The trending ability of EC-CO was poor.
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J Clin Monit Comput · Dec 2024
Relationship between the amplitudes of cerebral blood flow velocity and intracranial pressure using linear and non-linear approach.
Intracranial pressure (ICP), cerebral blood flow and volume are affected by craniospinal elasticity and cerebrospinal fluid dynamics, interacting in complex, nonlinear ways. Traumatic brain injury (TBI) may significantly alter this relationship. This retrospective study investigated the relationship between the vascular and parenchymal intracranial compartments by analysing two amplitudes: cerebral blood flow velocity (AmpCBFV) and ICP (AMP) during hypocapnia manoeuvre in TBI patients. ⋯ The relative frequency of symmetrical word types (JSAsym) describing the AmpCBFV-AMP interaction decreased during hypocapnia (0.35 ± 0.30) compared to baseline (0.44 ± 0.030; p = 0.004). Our results indicate that while the grouped-averaged AmpCBFV and AMP were not significantly correlated, either at baseline or during hypocapnia, significant changes were observed when using RAMP and JSA indices. Further validation of these new parameters, which reflect the association between the vascular and parenchymal intracranial compartments, is needed in a larger cohort.
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J Clin Monit Comput · Dec 2024
A novel wearable bioimpedance sensor for continuous monitoring of fluid balance: a study on isotonic hypovolemia in healthy adults.
This study aimed to investigate the ability of a novel wearable bioimpedance sensor to monitor changes in fluid balance induced by furosemide. Because iso-osmotic fluid loss is expected to primarily comprise fluid from the extracellular compartment it was hypothesized that isotonic hypovolemia would increase the extracellular resistance (RE). ⋯ This study demonstrates that the wearable bioimpedance device tested is very sensitive to furosemide-induced changes in fluid volume in healthy volunteers in a controlled environment. Additional research is needed to evaluate the ability of the device to track fluid status in a clinical setting.
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This correspondence is in response to Dr. David Allison's comments to the Editor, regarding the American Society of Neurophysiological Monitoring's (ASNM) updated intraoperative somatosensory evoked potential (SEP) monitoring position statement.
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J Clin Monit Comput · Dec 2024
Respiratory rate measurement by pressure variation in the high flow nasal cannula-system in healthy volunteers.
This study tests if the pressure variation in the HFNC-system may allow for monitoring of respiratory rate and the pressure difference during breathing may be a marker of respiratory effort. ⋯ The pressure variation in the HFNC system allows for respiratory rate and effort monitoring, but requires further development to increase precision.