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Intermittent mandatory ventilation
Intermittent Mandatory Ventilation (IMV) refers to any mode of mechanical ventilation where a regular series of breaths are scheduled but the ventilator senses patient effort and reschedules mandatory breaths based on the calculated need of the patient. Similar to continuous mandatory ventilation in parameters set for the patients pressures and volumes but distinct in its ability to support a patient by either supporting their own effort or providing support when patient effort is not sensed. IMV is frequently paired with additional strategies to improve weaning from ventilator support or to improve cardiovascular stability in patients who may need full life support.
== Synchronized intermittent mechanical ventilation (SIMV) ==
Synchronized Intermittent Mechanical Ventilation is a variation of IMV, in which the ventilator breaths are synchronized with patient inspiratory effort.〔Sassoon CS, Del Rosario N, Fei R, et al. Influence of pressure- and flow-triggered synchronous intermittent mandatory ventilation on inspiratory muscle work. Crit Care Med 1994; 22:1933.〕〔Christopher KL, Neff TA, Bowman JL, et al. Demand and continuous flow intermittent mandatory ventilation systems" ''Chest'' 1985; 87:625.〕 SIMV, with and without pressure support has not been shown to have any advantages over continuous mandatory ventilation (CMV) in terms of mortality or weaning success, and has been shown to result in longer weaning times when compared to t-piece trials or gradual reductions in pressure support. Some studies have shown an increase in patient work of breathing when switched from CMV to SIMV, and others have demonstrated potential detrimental effects of SIMV on respiratory muscles and respiratory drive.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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