A 68-year-old man presents to the emergency department with worsening chest pain. He has a history of congestive heart failure and currently takes digoxin. Physical examination reveals an acutely ill man who is tachypneic. His room air pulse oximetry is 90%. Pulmonary auscultation reveals bilateral wheezing. Neck examination reveals jugular venous distension. Which one of the following is the most appropriate treatment for this patient?

A 68-year-old man presents to the emergency department with worsening chest pain. He has a history of congestive heart failure and currently takes digoxin. Physical examination reveals an acutely ill man who is tachypneic. His room air pulse oximetry is 90%. Pulmonary auscultation reveals bilateral wheezing. Neck examination reveals jugular venous distension. Which one of the following is the most appropriate treatment for this patient?

A 47-year-old man with a history of intermittent panic disorders presents to his primary care physician desiring therapy. He has no other pertinent past medical or surgical history. Physical examination of the heart, lungs, and abdomen are within normal limits. What is the most appropriate treatment for this patient?

A 34-year-old man suffers a seizure while in a shopping mall. Witnesses tell the paramedics that the individual lost consciousness and then had rapid contraction and relaxation of his extremities. He then awoke and was confused. What is the most likely diagnosis?

A 72-year-old man is brought to his physician by his son. The son complains that this patient has been becoming forgetful, confused, moody, and aggressive over the past few months. Which of the following neurotransmitter changes is characteristic of Alzheimer's disease?

A 34-year-old woman with multiple sclerosis presents with uncontrollable muscle spasms. The physician prescribes tizanidine to help control the spasms. Tizanidine's mechanism of action is most similar to which of the following drugs?