A 53-year-old man who is a 40 pack-year smoker presents to his primary care physician with a productive cough, fever, and chills. He sits in an office all day and recently began using an air conditioner as the weather has warmed. No organisms were visible with a gram stain of sputum, but a silver stain reveals rods. His medical history includes myocardial infarction, for which he takes ticlopidine; hyperglycemia, for which he takes metformin; and a congenital QT segment prolongation. For which of the following reasons would the physician be hesitant to prescribe erythromycin to treat his legionellosis?

A 53-year-old man who is a 40 pack-year smoker presents to his primary care physician with a productive cough, fever, and chills. He sits in an office all day and recently began using an air conditioner as the weather has warmed. No organisms were visible with a gram stain of sputum, but a silver stain reveals rods. His medical history includes myocardial infarction, for which he takes ticlopidine; hyperglycemia, for which he takes metformin; and a congenital QT segment prolongation. For which of the following reasons would the physician be hesitant to prescribe erythromycin to treat his legionellosis?

A 24-year-old Caucasian woman with dysplastic nevus syndrome presents to her annual checkup with a suspicious-looking mole. The physician decides to remove it. To prepare the site, she injects a lidocaine preparation. The surrounding tissue blanches. What is most likely present with the lidocaine that causes the blanching?

A 34-year-old man with a sacral spinal cord injury has neurogenic bowel. He is on a bowel regimen that involves periodic bowel cleansing with soapsuds enemas. He is given a trial of bethanechol for this condition. Which of the following adverse events must his treating physician be aware of?

A 9-year-old boy with chronic otitis media infections is scheduled to undergo bilateral ear tube placement under inhalational anesthesia. Which of the following will occur as a result of administration of this agent?

A 27-year-old woman complains of right flank pain and hematuria. She has passed calcium oxalate stones in the past and likely has another stone. After treating her for her stone, which of the following diuretics should she avoid to prevent future calcium oxalate stones?