For example: char a; a= getchar(); The function getchar() reads a single character from the standard input device, the keyboard being assumed because that is the standard input device, and assigns it to the variable a.
This excludes acute and chronic respiratory failure (518.84), acute respiratory distress (518.82), acute respiratory failure following trauma and surgery (518.51), chronic respiratory failure (518.83), respiratory arrest (799.1), and respiratory failure, newborn (770.84). This applies to respiratory failure NOS.
Definition of acute respiratory failure. Acute respiratory failure is classified as hypoxemic (low. arterial oxygen levels), hypercapneic (elevated levels of car-. bon dioxide gas), or a combination of the two. In most cases. one or the other predominates.