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 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 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?

Which of the following patient presentations would best benefit from therapy with digoxin?

A 68-year-old man with congestive heart failure presents to the emergency department with shortness of breath. He has +2 pitting edema in his extremities as well. A chest X-ray confirms the presence of pulmonary edema. The patient is given ethacrynic acid to diurese the excess fluid. Where in the nephron does ethacrynic acid act?