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Hemodynamic and Oxygen Transport Characteristics of Common Ventilatory Modes: Conclusion
The information comparing SIMV and ACV modes are conflicting. Opposite effects of SIMV on cardiac function’ and oxygen consumption have been reported. The SIMV can influence oxygen consumption as the result of increasing the oxygen cost of breathing by the respiratory muscles during spontaneous breathing activity. This, in turn, could be reflected in the frequency […]
Hemodynamic and Oxygen Transport Characteristics of Common Ventilatory Modes: Discussion
The SIMV mode has been promoted as a mean of positive-pressure ventilatory support with minimal effect on venous return by allowing ITP to decrease during the spontaneous inspiratory efforts. Previous studies had suggested that in normal individuals and in those with ventricular dysfunction the steady state cardiac output is not different on SIMV as compared […]
Hemodynamic and Oxygen Transport Characteristics of Common Ventilatory Modes: Results
Results of this study show that patients on SIMV and PSV modes can achieve similar levels of Ve as when on ACV mode. However, Vt is significantly diminished and f is raised substantially during SIMV to reach similar Ve as achieved on the other two ventilatory modes. It is also noteworthy that in both SIMV […]
Hemodynamic and Oxygen Transport Characteristics of Common Ventilatory Modes: Statistical Analysis
Baseline ventilatory, hemodynamic, and oxygen transport data were obtained on ACV mode. Patients were then placed sequentially on SIMV and PSV modes for 30 min each. All measurements were repeated during the last 10 min before patients were switched to the next ventilatory mode. After the study was completed, patients were placed back on the […]
Hemodynamic and Oxygen Transport Characteristics of Common Ventilatory Modes: Measurements
Right heart catheterization was performed using a 7F Swan-Ganz catheter (Edwards Laboratories, Santa Ana, Calif) inserted percutaneously via an internal jugular or subclavian vein. All measurements were done while in supine position with the zero pressure taken as the atmospheric pressure at the midaxillary level. All values were recorded at end expiration. The CO was […]
Hemodynamic and Oxygen Transport Characteristics of Common Ventilatory Modes: Patients
This study was approved by our Institutional Review Board. Each patient or their next of kin signed a written informed consent form. We studied 12 patients admitted to the medical intensive care units (Veterans Affairs and University of Cincinnati Medical Centers) who were already on mechanical ventilatory support and were being hemodynamically monitored as determined […]
Hemodynamic and Oxygen Transport Characteristics of Common Ventilatory Modes
Assist control ventilation (ACV), synchronized intermittent mandatory ventilation (SIMV), and pressure support ventilation (PSV) are the three most conventional and commonly used modes of ventilatory support in patients requiring mechanical ventilation. The latter two modes are, in addition, applied very frequently to wean patients off ventilatory support. The PSV augments the patient’s spontaneous breaths with […]
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