When assessing an adult patient with difficulty breathing, what sign or symptom would be of most concern?

Question

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Blue coloration to the lips may indicate cyanosis, which is a sign of inadequate oxygenation and is a serious concern in a patient with difficulty breathing. A high temperature, respiratory rate within a normal range, or cyanosis limited to the fingernails may also be important to note, but they are not as urgent as cyanosis of the lips.

When Assessing an Adult Patient with Difficulty Breathing, What Sign