urinary tract infection

An 80-year-old woman is brought to the emergency department from a nursing home due to increased lethargy and confusion over the past 24 hours. Her history includes dementia, hypertension, and type 2 diabetes. Nursing staff report poor oral intake for 48 hours and a recent cough. On examination, she is drowsy but rousable. Her vital signs are: BP 85/50 mmHg, HR 110 bpm, RR 22 breaths/min, Temp 37.8°C, SpO2 94% on air. Capillary refill time is 4 seconds. Chest auscultation reveals decreased breath sounds at the bases. Abdomen is soft. Urine dipstick shows leukocytes and nitrites. She is on lisinopril and metformin. What is the most appropriate initial management step?

A 32-year-old woman presents to the emergency department with a 2-day history of fever, chills, and right flank pain. She has a history of recurrent urinary tract infections. On examination, she is febrile with a temperature of 38.5°C, her heart rate is 110 bpm, and her blood pressure is 110/70 mmHg. There is tenderness on palpation of the right costovertebral angle. Urinalysis shows pyuria and bacteriuria. What is the most appropriate initial management for this patient?

A 25-year-old woman presents to the clinic with a 3-day history of dysuria, increased urinary frequency, and urgency. She denies fever, flank pain, or vaginal discharge. She is sexually active and uses oral contraceptives. On examination, she is afebrile and her vital signs are stable. Urinalysis shows pyuria and bacteriuria. What is the most appropriate treatment?

A 62-year-old male presents to the emergency department with a 2-day history of right flank pain, fever, and nausea. He reports a history of recurrent urinary tract infections. On examination, he has right costovertebral angle tenderness. Urinalysis reveals pyuria and leukocyte esterase. Which of the following is the most likely underlying condition related to the organ primarily affected in the right lumbar region?