The Bicore pulmonary monitor

Petros, Andy; Lamond, C. T.; Bennett, Desmond J

doi:10.1111/j.1365-2044.1993.tb07481.x

Cited by 71 publications

(3 citation statements)

References 10 publications

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“…Patient and ventilator variables were measured with a pulmonary mechanics monitor incorporating Campbell diagram software (Bicore CP-100, Viasys Healthcare, Palm Springs, CA). The precision and accuracy of this monitor have been previously validated (14,15). The monitor and transducers were calibrated before each study.…”

Section: Methodsmentioning

confidence: 99%

Effects of tidal volume on work of breathing during lung-protective ventilation in patients with acute lung injury and acute respiratory distress syndrome*

Kallet

Campbell

Dicker

et al. 2006

Critical Care Medicine

118

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Section: Methodsmentioning

confidence: 99%

Effects of tidal volume on work of breathing during lung-protective ventilation in patients with acute lung injury and acute respiratory distress syndrome*

Kallet

Campbell

Dicker

et al. 2006

Critical Care Medicine

118

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“…Online supplemental table S1 which summarises the main characteristics of 17 physiological studies evaluating different SBTs, suggests that mechanical ventilation allows to unload the respiratory muscles 3 8–14 17 19 21. As the amount of support provided by the given SBTs’ modality increases (assisted trials), the workload of patient’s respiratory muscles decreases.…”

Section: Discussionmentioning

confidence: 99%

“…A physiological meta-analysis from Sklar et al published in 2017,3 including 16 studies and 239 patients, reported that PSV reduces respiratory effort compared with T-piece trial which reflected physiological conditions after extubation more accurately. However, the authors conclude that these results are tempered by the limited number of studies, the small number of patients included in each and by methodological heterogeneity 8–23. The authors of this meta-analysis3 stated that further investigations are therefore necessary.…”

Section: Introductionmentioning

confidence: 97%

Which spontaneous breathing trial to predict effort to breathe after extubation according to five critical illnesses: the cross-over GLOBAL WEAN study protocol

et al. 2023

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IntroductionReadiness to be freed from ventilatory support can be evaluated by spontaneous breathing trial (SBT) assessing the patient’s ability to sustain respiratory effort after extubation. Current SBT practices are heterogenous and there are few physiological studies on the topic. The objective of this study is to assess which SBT best reproduces inspiratory effort to breathe after extubation depending on the patient’s illness.Methods and analysisThis will be a multicentre randomised cross-over physiological study, in a large population, in the era of modern intensive care units using last generation modern ventilators. Each included patient will perform three 15-minute SBTs in a random order: pressure support ventilation (PSV) level of 7 cmH2O with positive end expiratory pressure (PEEP) level of 0 cmH2O, PSV 0 cmH2O with PEEP 0 cmH2O and T-piece trial. A rest period of baseline state ventilation will be observed between the SBTs (10 min) and before extubation (30 min). Primary outcome will be the inspiratory muscle effort, reflected by pressure time product per minute (PTPmin). This will be calculated from oesophageal pressure measurements at baseline state, before and after each SBT and 20 min after extubation. Secondary outcomes will be PTPmin at 24 hours and 48 hours after extubation, changes in physiological variables and respiratory parameters at each step, postextubation respiratory management and the rate of successful extubation. One hundred patients with at least 24 hours of invasive mechanical ventilation will be analysed, divided into five categories of critical illness: abdominal surgery, brain injury, chest trauma, chronic obstructive pulmonary disease and miscellaneous (pneumonia, sepsis, heart disease).Ethics and disseminationThe study project was approved by the appropriate ethics committee (2019-A01063-54, Comité de Protection des Personnes TOURS - Région Centre - Ouest 1, France). Informed consent is required, for all patients or surrogate in case of inability to give consent.Trial registration numberNCT04222569.

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Are tidal volume measurements in neonatal pressure‐controlled ventilation accurate?

Chow

Vanderhal

Raber

et al. 2002

Pediatric Pulmonology

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Bedside pulmonary mechanics monitors (PMM) have become useful in ventilatory management in neonates. These monitors are used more frequently due to recent improvements in data-processing capabilities. PMM devices are often part of the ventilator or are separate units. The accuracy and reliability of these systems have not been carefully evaluated. We compared a single ventilatory parameter, tidal volume (V(t)), as measured by several systems. We looked at two freestanding PMMs: the Ventrak Respiratory Monitoring System (Novametrix, Wallingford, CT) and the Bicore CP-100 Neonatal Pulmonary Monitor (Allied Health Care Products, Riverside, CA), and three ventilators with built-in PMM: the VIP Bird Ventilator (Bird Products Corp., Palm Springs, CA), Siemens Servo 300A (Siemens-Elema AB, Solna, Sweden), and Drager Babylog 8000 (Drager, Inc., Chantilly, VA). A calibrated syringe (Hans Rudolph, Inc., Kansas City, MO) was used to deliver tidal volumes of 4, 10, and 20 mL to each ventilator system coupled with a freestanding PMM. After achieving steady state, six consecutive V(t) readings were taken simultaneously from the freestanding PMM and each ventilator. In a second portion of the bench study, we used pressure-control ventilation and measured exhaled tidal volume (V(te)) while ventilating a Bear Test Lung with the same three ventilators. We adjusted peak inspiratory pressure (PIP) under controlled conditions to achieve the three different targeted tidal volumes on the paired freestanding PMM. Again, six V(te) measurements were recorded for each tidal volume. Means and standard deviations were calculated.The percentage difference in measurement of V(t) delivered by calibrated syringe varied greatly, with the greatest discrepancy seen in the smallest tidal volumes, by up to 28%. In pressure control mode, V(te) as measured by the Siemens was significantly overestimated by 20-95%, with the biggest discrepancy at the smallest V(te), particularly when paired with the Bicore PMM. V(te), as measured by the VIP Bird and Drager paired with the Ventrak PMM, had a tendency to underestimate V(t) by up to 25% at the smallest V(te). However, when paired with the Bicore PMM, these same two ventilators read over target by up to 18%. Under controlled laboratory conditions, we demonstrated that true delivered V(te), as measured by the three ventilators and two freestanding PMM, differed markedly. In general, decreasing dynamic compliance of the tubing was not associated with greater inaccuracy in V(te) measurements.

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The Bicore pulmonary monitor

Abstract: SummaryThe Bicore

Cited by 71 publications

References 10 publications

Effects of tidal volume on work of breathing during lung-protective ventilation in patients with acute lung injury and acute respiratory distress syndrome*

Effects of tidal volume on work of breathing during lung-protective ventilation in patients with acute lung injury and acute respiratory distress syndrome*

Which spontaneous breathing trial to predict effort to breathe after extubation according to five critical illnesses: the cross-over GLOBAL WEAN study protocol

Are tidal volume measurements in neonatal pressure‐controlled ventilation accurate?

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