You respond to the residence of a 70-year-old male who complains of weakness and severe shortness of breath. his wife tells you that he is a dialysis patient, but has missed his last two treatments. after applying high-flow oxygen, you auscultate his lungs and hear diffuse rhonchi. the patient is conscious, but appears confused. his blood pressure is 98/54 mm hg, his pulse rate is 120 beats/min and irregular, and his respirations are 24 breaths/min and labored. you should