What should be initiated when oxygen saturation is low at 87%?

When oxygen saturation is measured at a low level of 87%, the priority is to improve that oxygen saturation to ensure adequate oxygen delivery to vital organs. Starting supplemental oxygen is a fundamental intervention for patients exhibiting signs of hypoxemia. Administering oxygen via a nasal cannula at a rate of 4L/min is a common first step in addressing low oxygen saturation levels. This method is generally well-tolerated and can effectively raise the blood’s oxygen concentration, which is essential for maintaining organ function and preventing further complications.

The other choices do not directly address the immediate need for oxygenation. Nitroglycerine is primarily used for angina or heart failure and could potentially lower blood pressure without improving oxygenation. Performing cardiopulmonary resuscitation is reserved for situations where there is no pulse or breathing, and increasing the respiratory rate might be appropriate in some contexts, but it does not directly provide supplemental oxygen. Therefore, the recommended action in response to a low oxygen saturation reading is to initiate oxygen therapy, which aligns with the first choice.