Acute respiratory failure is suggested by which of the following?

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Acute respiratory failure is the failure of a person to take in from the atmosphere adequate oxygen to supply this necessary element to the tissues, or failure to ventilate sufficiently to exhale normal amounts of carbon dioxide. A patient with a CO₂ level over 50 who usually breathes normally and is now acidotic (pH <7.35), is hypoventilating and suffering from acute respiratory failure. Another indication of acute respiratory failure on arterial blood gas analysis is a PaO₂ less than 60 torr.

Acute Respiratory Failure Is Suggested by Which of the Following