Jet or intensive care unit ventilator during simulated percutaneous transtracheal ventilation: a lung model study

We developed an apparatus and technique for the simultaneous measurement of functional residual capacity and oxygen uptake (V̇O2) for use in intensive care unit (ICU) patients. The accuracy of the functional residual capacity measurement was proven using an in vitro lung model and the reproducibility of this measurement was established by use in ICU patients. We tested the accuracy of the V̇O2 measurement in comparison with two other methods in common use among ICU patients and our method proved accurate. We conclude that this technique for measurement of functional residual capacity and V̇O2 is highly accurate and easily applied to patients on any mode of mechanical ventilation.

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Performance Characteristics of Five New Anesthesia Ventilators and Four Intensive Care Ventilators in Pressure-support Mode

Anesthesiology ◽

10.1097/00000542-200611000-00015 ◽

2006 ◽

Vol 105 (5) ◽

pp. 944-952 ◽

Cited By ~ 36

Author(s):

Samir Jaber ◽

Didier Tassaux ◽

Mustapha Sebbane ◽

Yvan Pouzeratte ◽

Anne Battisti ◽

...

Keyword(s):

Intensive Care Unit ◽

Intensive Care ◽

Pressure Support Ventilation ◽

Gas Flow ◽

Pressure Support ◽

Inspiratory Effort ◽

Performance Characteristics ◽

Lung Model ◽

Support Ventilation ◽

Ventilation Performance

Background During the past few years, many manufacturers have introduced new modes of ventilation in anesthesia ventilators, especially partial-pressure modalities. The current bench test study was designed to compare triggering and pressurization of five new anesthesia ventilators with four intensive care unit ventilators. Methods Ventilators were connected to a two-compartment lung model. One compartment was driven by an intensive care unit ventilator to mimic "patient" inspiratory effort, whereas the other was connected to the tested ventilator. The settings of ventilators were positive end-expiratory pressures of 0 and 5 cm H2O, and pressure-support ventilation levels of 10, 15, and 20 cm H2O with normal and high "patient" inspiratory effort. For the anesthesia ventilators, all the measurements were obtained for a low (1 l/min) and a high (10 l/min) fresh gas flow. Triggering delay, triggering workload, and pressurization at 300 and 500 ms were analyzed. Results For the five tested anesthesia ventilators, the pressure-support ventilation modality functioned correctly. For inspiratory triggering, the three most recent anesthesia machines (Fabius, Drägerwerk AG, Lübeck, Germany; Primus, Drägerwerk AG; and Avance, GE-Datex-Ohemda, Munchen, Germany) had a triggering delay of less than 100 ms, which is considered clinically satisfactory and is comparable to intensive care unit machines. The use of positive end-expiratory pressure modified the quality of delivered pressure support for two anesthesia ventilators (Kion, Siemens AG, Munich, Germany; and Felix, Taema, Antony, France). Three of the five anesthesia ventilators exhibited pressure-support ventilation performance characteristics comparable to those of the intensive care unit machines. Increasing fresh gas flow (1 to 10 l/min) in the internal circuit did not influence the pressure-support ventilation performance of the anesthesia ventilators. Conclusion Regarding trigger sensitivity and the system's ability to meet inspiratory flow during pressure-supported breaths, the most recent anesthesia ventilators have comparable performances of recent-generation intensive care unit ventilators.

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Heat and moisture exchanger used in a cardiothoracic surgery intensive care unit: Airway resistance and changing interval

Turkish Journal of Thoracic and Cardiovascular Surgery ◽

10.5606/tgkdc.dergisi.2020.20088 ◽

2020 ◽

Vol 28 (4) ◽

pp. 593-600

Author(s):

Huan Liu

Keyword(s):

Intensive Care Unit ◽

Intensive Care ◽

Airway Resistance ◽

Cardiothoracic Surgery ◽

Lung Model ◽

Heat And Moisture Exchanger ◽

Moisture Exchanger ◽

Heat And Moisture Exchangers ◽

Heat And Moisture

Background: This study aims to investigate the efficacy and safety of heat and moisture exchanger on airway resistance in a cardiothoracic surgery intensive care unit. Methods: A total of 31 patients (18 males, 13 females; mean age 51.5 years; range, 39 to 61 years) who were treated with long-term mechanical ventilation due to low cardiac output syndrome after cardiopulmonary bypass and cardiac surgery were retrospectively analyzed between December 2014 and December 2018. In addition, an in vitro lung model and different doses of hydroxyethyl starch in the heat and moisture exchangers to mimic the airway secretions were used and the proper interval to change heat and moisture exchangers was evaluated. Results: In the in vitro lung model, the mean airway resistance was 19.4±0.2 cmH2O/L/sec in the 5 mL group (p=0.060), 20.3±1.0 cmH2O/L/sec in the 10 mL group (p=0.065), and 30.2±1.7 cmH2O/L/sec in the 15 mL group (p<0.001). The airway resistance of heat and moisture exchangers, and total hospital stay and ventilation duration significantly increased in the seven-day group compared to the one-day and three-day groups. The positive culture of bacteria was also significantly higher in the seven-day group. Conclusion: Our study results suggest that heat and moisture exchangers can be safely used for an efficient and timely removal of airway secretions. Volume of approximately 15 mL of liquid in the airflow can dramatically increase the airway resistance. The three-day interval of changing heat and moisture exchangers is ideal in a cardiothoracic surgery intensive care unit where patients have more airway secretions than patients in the general intensive care unit.

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The Psychosocial Aspects of Feeding in the Neonatal Intensive Care Unit and Beyond

Perspectives of the ASHA Special Interest Groups ◽

10.1044/2019_persp-19-00097 ◽

2019 ◽

Vol 4 (6) ◽

pp. 1507-1515

Author(s):

Lauren L. Madhoun ◽

Robert Dempster

Keyword(s):

Intensive Care Unit ◽

Intensive Care ◽

Neonatal Intensive Care Unit ◽

Hospital Discharge ◽

Neonatal Intensive Care ◽

Oral Feeding ◽

Medical Attention ◽

Primary Role ◽

Speech Language Pathologists ◽

The Family

Purpose Feeding challenges are common for infants in the neonatal intensive care unit (NICU). While sufficient oral feeding is typically a goal during NICU admission, this can be a long and complicated process for both the infant and the family. Many of the stressors related to feeding persist long after hospital discharge, which results in the parents taking the primary role of navigating the infant's course to ensure continued feeding success. This is in addition to dealing with the psychological impact of having a child requiring increased medical attention and the need to continue to fulfill the demands at home. In this clinical focus article, we examine 3 main areas that impact psychosocial stress among parents with infants in the NICU and following discharge: parenting, feeding, and supports. Implications for speech-language pathologists working with these infants and their families are discussed. A case example is also included to describe the treatment course of an infant and her parents in the NICU and after graduation to demonstrate these points further. Conclusion Speech-language pathologists working with infants in the NICU and following hospital discharge must realize the family context and psychosocial considerations that impact feeding progression. Understanding these factors may improve parental engagement to more effectively tailor treatment approaches to meet the needs of the child and family.

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