What should always follow the administration of oxygen in cases of DCS?

After administering oxygen in cases of Decompression Sickness (DCS), it is crucial to conduct a comprehensive approach to patient care. This includes immediate transport to a medical facility, which is essential for the use of hyperbaric oxygen therapy that can effectively treat DCS. Additionally, assessing vital signs is critical as it provides important information regarding the patient's current condition, allowing responders to track any changes in health status effectively.

Monitoring for changes in symptoms is equally important. The condition of a patient with DCS can fluctuate, and ongoing observation helps in identifying any potential deterioration or improvement. Each of these steps—transport, assessment of vital signs, and symptom monitoring—plays a vital role in ensuring the patient receives the best possible care after oxygen administration.

Thus, the correct answer encompasses all these actions, reflecting a holistic and thorough approach to managing DCS after the initial intervention of administering oxygen.