Ventilatory muscle recruitment and work of breathing in patients with respiratory failure after thoracic surgery1

Takeda, Shin; Miyoshi, Shinichiro; Maeda, Hitoshi; Minami, Masato; Yoon, Hyung Eun; Tanaka, Hatsukazu; Nakahara, Kazunari; Matsuda, Hikaru

doi:10.1016/s1010-7940(99)00020-2

Cited by 8 publications

(11 citation statements)

References 23 publications

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“…CPT was aimed to help a patient to be weaned off the ventilator by removing secretion and increasing ventilation. Thoracic movement disorders can also occur from prolonged ventilator use (Takeda et al, 1999), due to air-trapping and hyperinflation of the chest wall, which causes the intercostal muscles to become lengthened.…”

Section: Discussionmentioning

confidence: 99%

Acute clinical benefits of chest wall-stretching exercise on expired tidal volume, dyspnea and chest expansion in a patient with chronic obstructive pulmonary disease: A single case study

Leelarungrayub

Pothongsunun

Yankai

et al. 2009

Journal of Bodywork and Movement Therapies

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Section: Discussionmentioning

confidence: 99%

Acute clinical benefits of chest wall-stretching exercise on expired tidal volume, dyspnea and chest expansion in a patient with chronic obstructive pulmonary disease: A single case study

Leelarungrayub

Pothongsunun

Yankai

et al. 2009

Journal of Bodywork and Movement Therapies

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“…In healthy men, negative airway pressures during inspiration are physiological. In patients with impaired respiratory mechanics following thoracotomy, however, negative inspiratory pressure changes, and loss of positive airway pressure following extubation may cause derecruitment of lung areas and atelectasis, leading to a worsening of pulmonary gas exchange (12,13) and increased respiratory workload (14). In conjunction with shallow breathing as a result of insufficient pain relief or postoperative drowsiness and persistent diaphragmatic dysfunction, these mechanisms may cause hypoxemia and contribute to increased pulmonary morbidity.…”

Section: Discussionmentioning

confidence: 99%

Nasal CPAP therapy: effects of different CPAP levels on pressure transmission into the trachea and pulmonary oxygen transfer

Kindgen‐Milles

Buhl

Loer

et al. 2002

Acta Anaesthesiol Scand

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“…A human respiratory system during and after weaning from MV was modeled thermodynamically using the first and second laws of thermodynamics. The data of work of breathing by the respiratory muscles of the patients during and after weaning from MV is adapted from the literature [2]. Calculations were done by applying the first and second laws of thermodynamics.…”

Section: Model Descriptionmentioning

confidence: 99%

“…The use of MV varies significantly from short term to long term and from acute care in the hospital to extended care at home. One of the most common applications of MV is for the management of postoperative patients recovering from anesthesia and medications [1,2].…”

Section: Introductionmentioning

confidence: 99%

Solunum Yetmezliği Olan Hastalarda Mekanik Ventilasyon Sırasında ve Sonrasında Entropi Üretimi ve Ekserji Yıkımı

Çatak¹,

Develi²,

Bayram³

2020

European Journal of Science and Technology

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BACKGROUND: Mechanical ventilation is a useful supportive treatment for patients with respiratory failure who are not able to maintain the level of ventilation required to maintain the oxygenation and carbon dioxide elimination. Mechanical ventilation is often life-saving, but it also has risks. Thermodynamic analyses are used to test the feasibility of processes leading to a better understanding of the system's overall performance. Energy losses (entropy) and the destruction of maximum useful work (exergy) leading to reduced respiratory work of breathing efficiency, can be calculated by thermodynamic analysis of the respiratory muscles. OBJECTIVE: To determine the entropy generation, exergy destruction, and glucose consumption during and after weaning from mechanical ventilation in patients with respiratory failure by thermodynamic analysis. METHODS: In this study, a human respiratory system during and after weaning from mechanical ventilation modeled thermodynamically using the first and second laws of thermodynamics. The work of breathing data adapted from the literature. Mass and energy analyzes are carried out according to the 1st law of thermodynamics, while entropy generation is calculated according to the 2nd law of thermodynamics which enables us to measure energy losses. In this thermodynamic model, the body temperature was considered at 37 °C, and the surrounding air condition was taken at 25 °C. RESULTS: Exergy destructions during and after weaning from mechanical ventilation were calculated as 2.23x10-2 and 1.75x10-2 kJ/min, respectively. Entropy generation by the patients through the breathing cycle was 7.48x10-5 (kJ/K)/min during mechanical ventilation while 5.89x10-5 (kJ/K)/min after weaning from mechanical ventilation, respectively. The glucose consumed for work of breathing in patients during and after weaning from mechanical ventilation was calculated as 0.58-0.45 mmol/min, respectively. CONCLUSION: After weaning from mechanical ventilation, the patients have significantly decreased entropy generation, exergy destruction, and glucose consumption, indicating to the improvements in the structure of respiratory mechanics and diaphragm perfusion. The reductions in entropy generation and exergy destruction after weaning from mechanical ventilation also indicates an increase in the mechanical efficiency of the respiratory muscles. According to the results of the energy balance analysis, the decrease in muscle energy requirement, was determined and the calculations found that the patient used 1.3 times more glucose during mechanical ventilation than after weaning from mechanical ventilation for work of breathing. In this study, the thermodynamic approach was used to determine the benefit of mechanical ventilation. More powerful work and multidisciplinary data are needed to progress reliable procedures.

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Ventilatory muscle recruitment and work of breathing in patients with respiratory failure after thoracic surgery1

Cited by 8 publications

References 23 publications

Acute clinical benefits of chest wall-stretching exercise on expired tidal volume, dyspnea and chest expansion in a patient with chronic obstructive pulmonary disease: A single case study

Acute clinical benefits of chest wall-stretching exercise on expired tidal volume, dyspnea and chest expansion in a patient with chronic obstructive pulmonary disease: A single case study

Nasal CPAP therapy: effects of different CPAP levels on pressure transmission into the trachea and pulmonary oxygen transfer

Solunum Yetmezliği Olan Hastalarda Mekanik Ventilasyon Sırasında ve Sonrasında Entropi Üretimi ve Ekserji Yıkımı

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