Which is NOT a physiological effect of respiratory failure?

Respiratory failure occurs when the lungs fail to provide adequate oxygenation to the blood or to remove carbon dioxide effectively, leading to several physiological effects. Hypoxia, which is a deficiency in the amount of oxygen reaching the tissues, is a direct consequence of respiratory failure. Cyanosis, a bluish discoloration of the skin and mucous membranes, occurs as a result of hypoxia when there is insufficient oxygen in the blood. Tachycardia, or an increased heart rate, is the body’s compensatory response to low oxygen levels, as the heart attempts to circulate blood more quickly to deliver the limited oxygen available to tissues.

Hypertension, on the other hand, is not a direct physiological consequence of respiratory failure. Instead, in many cases of respiratory failure, especially if it is acute, the body may experience hypotension due to decreased cardiac output and other factors. Thus, hypertension does not typically relate to the pathophysiological changes occurring in respiratory failure, making it the choice that does not fit with the other physiological effects listed.