Self-inflating manual resuscitators (SIMR) are devices used to ventilate patients with ventilatory needs. These devices consist of a set of valves that work sequentially, and changes in their function may be harmful to patients. During the use of SIMR, it was observed that the valve remained fixed due to the presence of dried pulmonary secretion, which made it impossible to ventilate the patient, but not manipulate the compressible unit. This situation reaffirms that the resuscitator is a device that should be used by trained professionals because, although changes in functioning are rare, they can be potentially fatal.61351-4