A 7-year-old conscious boy presents with marked respiratory distress. Your assessment reveals the presence of intercostal and supraclavicular retractions and nasal flaring. His oxygen saturation is 93% on room air, and his heart rate is rapid. The MOST appropriate initial treatment for this child involves:
A) administering high-flow oxygen as tolerated, auscultating his lung sounds, and being prepared to assist his ventilations.
B) conducting a focused history and physical exam and allowing him to breathe room air to see if his oxygen saturation falls.
C) recognizing that the child is in respiratory failure and making immediate preparations to perform endotracheal intubation.
D) assisting his ventilations with a bag-mask device and determining if his tachycardia is ventricular or supraventricular in origin.
Answer: A) administering high-flow oxygen as tolerated, auscultating his lung sounds, and being prepared to assist his ventilations.
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Individual characteristics of the drug-taker or environmental conditions will have little influence on drug effects when
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