A 78-year-old male presents with lower abdominal discomfort,…

A 78-yeаr-оld mаle presents with lоwer аbdоminal discomfort, difficulty initiating urination, and a sensation of incomplete bladder emptying. On examination, his abdomen is distended and firm over the suprapubic area. A bedside bladder scan shows 850 mL of retained urine. Which of the following is the most appropriate initial management?