Hello, I'm an expert in medical science with a focus on neurology and critical care. I can provide you with information on the relationship between coma and respiratory function. Coma is a state of unconsciousness where a person cannot be awakened and is not responsive to their environment. It is a clinical diagnosis made by observing a patient's lack of responsiveness to external stimuli. The level of consciousness is determined by the functioning of the brainstem and cortex. The brainstem is responsible for many vital functions, including respiration. In some cases, a person in a coma may still be able to breathe on their own if the brainstem is functioning adequately. However, the ability to breathe independently can vary depending on the severity and specific location of the brain injury or condition causing the coma. In more severe cases, the brainstem may be compromised, leading to the inability to breathe without mechanical ventilation. The decision to provide mechanical ventilation is based on the patient's overall condition and the likelihood of recovery. In summary, while it is possible for someone in a coma to breathe on their own, this ability is contingent upon the extent of the brain injury and the functionality of the brainstem. read more >>

Usually, a coma does not last more than a few weeks. Sometimes, however, a person stays in a coma for a long time �� even years �� and will be able to do very little except breathe on his or her own. Most people do come out of comas. Some of them are able to return to the normal lives they had before they got sick.read more >>