scholarly journals Effects of pressure-controlled and volume-controlled ventilation on respiratory mechanics and systemic stress response during prone position

SpringerPlus ◽  
2016 ◽  
Vol 5 (1) ◽  
Author(s):  
Oznur Sen ◽  
Mefkur Bakan ◽  
Tarik Umutoglu ◽  
Nurdan Aydın ◽  
Mehmet Toptas ◽  
...  
Keyword(s):  
Stress Response ◽  
Prone Position ◽  
Respiratory Mechanics ◽  
Controlled Ventilation ◽  
Volume Controlled Ventilation ◽  
Systemic Stress ◽  
Volume Controlled ◽  
Pressure Controlled ◽  
Systemic Stress Response

scholarly journals COMPARATIVE ANALYSIS OF PRESSURE CONTROLLED AND VOLUME CONTROLLED VENTILATION ON RESPIRATORY MECHANICS, HAEMODYNAMICS AND SYSTEMIC STRESS RESPONSE IN PATIENTS UNDERGOING SURGERY IN PRONE POSITION.

2021 ◽  
pp. 26-29
Author(s):  
Divya Gupta ◽  
Shobha Purohit ◽  
Mamta Sharma
Keyword(s):  
Blood Glucose ◽  
Prone Position ◽  
Lumbar Spine Surgery ◽  
P Value ◽  
Controlled Ventilation ◽  
Preoperative Serum ◽  
Volume Controlled Ventilation ◽  
Systemic Stress ◽  
Volume Controlled ◽  
Pressure Controlled

BACKGROUND: General Anaesthesia in prone position is related with increased airway pressure, decreased pulmonary and thoracic compliance. AIM: Comparision of pressure controlled and volume controlled ventilation in patients undergoing lumbar spine surgery in prone position.METHODS: After ethics committee approval & written informed consent, a comparative randomized interventional study was conducted from July-December 2017. Randomization was done using random number tables. Patients of either sex, ASA grade I&II, age 25-55 yrs were included while those with severe pulmonary ,cardiovascular, endocrine disease & BMI> 30kg/m2 were excluded. Patients were randomly assigned to VCV group (n = 30), or PCV group (n = 30). Haemodynamic (HR,SBP,DBP,MAP), Respiratory (P-Peak,P-mean,C-dyn) variables,blood glucose,S.cortisol were measured and ABG analysis was done 10 minutes after intubation (T1), 30 minutes after prone positioning(T2) and 60 minuts after extubation(T3). RESULTS: Demographic parameters , perioperative hemodynamic values were comparable with no significant statistical difference.The P-Peak levels were lower and dynamic compliance was higher in PCV group during both T1 and T2 with p value of less than 0.05 Postoperative PaO2 level was significantly higher in Group PCV compared with Group VCV.The difference between post operative and preoperative serum cortisol and blood glucose levels was significantly less in patients ventilated with PCV mode.CONCLUSION: According to our study,PCV mode is associated with lower P-peak levels during prone position, better oxygenation postoperatively and lesser systemic stress response.We concluded that PCV mode might be more appropriate in prone position surgeries.

scholarly journals Different Inspiratory Flow Waveform during Volume-Controlled Ventilation in ARDS Patients

2021 ◽  
Vol 10 (20) ◽  
pp. 4756
Author(s):  
Davide Chiumello ◽  
Andrea Meli ◽  
Tommaso Pozzi ◽  
Manuela Lucenteforte ◽  
Paolo Simili ◽  
...  
Keyword(s):  
Respiratory Mechanics ◽  
Major Effect ◽  
Inspiratory Flow ◽  
Flow Waveform ◽  
Controlled Ventilation ◽  
Volume Controlled Ventilation ◽  
The Mean ◽  
Flow Waveforms ◽  
Volume Controlled ◽  
Pressure Controlled

The most used types of mechanical ventilation are volume- and pressure-controlled ventilation, respectively characterized by a square and a decelerating flow waveform. Nowadays, the clinical utility of different inspiratory flow waveforms remains unclear. The aim of this study was to assess the effects of four different inspiratory flow waveforms in ARDS patients. Twenty-eight ARDS patients (PaO2/FiO2 182 ± 40 and PEEP 11.3 ± 2.5 cmH2O) were ventilated in volume-controlled ventilation with four inspiratory flow waveforms: square (SQ), decelerating (DE), sinusoidal (SIN), and trunk descending (TDE). After 30 min in each condition, partitioned respiratory mechanics and gas exchange were collected. The inspiratory peak flow was higher in the DE waveform compared to the other three waveforms, and in SIN compared to the SQ and TDE waveforms, respectively. The mean inspiratory flow was higher in the DE and SIN waveforms compared with TDE and SQ. The inspiratory peak pressure was higher in the SIN and SQ compared to the TDE waveform. Partitioned elastance was similar in the four groups; mechanical power was lower in the TDE waveform, while PaCO2 in DE. No major effect on oxygenation was found. The explored flow waveforms did not provide relevant changes in oxygenation and respiratory mechanics.

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