Final answer:
In extremely tight openings, and with unresponsive victims, sometimes a wristlet, helmet, pelvic, or improvised device is used.
Step-by-step explanation:
In extremely tight openings, and with unresponsive victims, sometimes a wristlet, helmet, pelvic, or improvised device is used. A wristlet is a medical device that can be used to assess and stabilize a patient's wrist in emergency situations.
A helmet can be used to protect the head during rescue operations or in situations where there is a risk of falling objects or head trauma. The term pelvic likely refers to a pelvic binder, which is used to apply pressure and stabilize the pelvis in cases of suspected pelvic fractures or severe pelvic injuries.
An improvised device refers to any object that is used as an emergency tool or equipment when the appropriate medical supplies are not available.