Which test is used to diagnose conduction disorders of the heart?

The patient is brought to the emergency department following a fire in his home. The nurse notes that the patient has singed facial hair and soot on his face. He is mildly tachypneic, his lung sounds are clear and equal, and the nurse notes pronounced stridor. His oxygen saturation is 90% on room air. Patient also complains of a sore throat and severe pain in his arms and hands, which have about 50% of their area covered by burns. Which of the following is the next best step in management?

Which patients are at an increased risk for Raynaud’s phenomenon? Select all that apply.