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natalie is in the end stages of lung cancer and is hooked up to a ventilator. she has recently suffered a stroke and slipped into a coma. natalie's physician informs her family that there is nothing more that can be done since natalie is now in brainstem death and should be disconnected from the ventilator. her family wants to be absolutely sure her prognosis is as poor as the doctor stated. which final test can confirm this diagnosis?

Sagot :

The apnea test is typically the last step in determining brain death in ventilator. It is carried out after it has been determined that the coma is irreversible, unresponsive, and that brainstem reflexes are absent.

The apnea test, which offers a crucial indicator of the final loss of brainstem function, is a requirement for determining brain death(BD). Removing the patient's breathing apparatus

High [tex]PaO_{2}[/tex] levels can be maintained for extremely long periods of time with continuous or intermittent oxygen supplementation in ventilator that is preceded by de-nitrogenation of blood gases. Preoxygenation improves oxygen delivery by removing alveolar nitrogen reserves. There are various methods for determining whether there is adequate oxygenation during AT. First, the respirator is removed from the patient, and then a catheter or cannula is inserted into the endotracheal tube, down to the level of the carina, and pure oxygen is administered at a rate of 4–10 l/min. Even without breathing, this would guarantee enough alveolar ventilation and oxygen delivery to the blood.

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