primary transfer:from an accident scene;
secondary transfer:between healthcare facilities (intra- or inter-hospital);
domiciliary ventilation;
improvised intensive care facilities, for example, military field hospitals, civilian contingency planning
Each application entails differences in the clinical condition of patients, operator experience, and demands
of the environment. A single device is unlikely to be ideal for all situations; therefore, a range of ventilators
are available. Three of these are considered as examples throughout this review (Table 1). Key practical
features of a portable ventilator are the gas and power supplies required and modes of ventilation supported.