An otherwise healthy 32 y.o. is seen in your office/ER soon after a cat bite. Typical of cat bites, the wound demonstrates several small puncture wounds that are not really amenable to irrigation or other wound care. Should you give an antibiotic? If so, which one would be considered a poor choice?

Correct Answer: A

Rationale: Cephalexin (Keflex®) is a poor choice because it doesn't cover Pasteurella multocida, a common pathogen in cat bites.

Correct Answer: C

Rationale: Untreated obstructive sleep apnea (OSA) is well-documented to increase perioperative risks, including respiratory and cardiovascular complications, due to airway obstruction and hypoxemia. This is supported by extensive literature, including ASA guidelines, making this the correct statement.

Correct Answer: B

Rationale: Lusitropic impairment refers to an energy-requiring process that removes free calcium ions from the cytoplasm by pumping them back into the sarcoplasmic reticulum and across the cell membrane into the extracellular fluid. Ischemia interferes with this process in the active phase of diastolic relaxation. Poor contractile force is not associated with lusitropic impairment. The conduction rate is not associated with the energy-requiring process known as lusitropy. Automaticity is not a factor in lusitropy.

Correct Answer: B

Rationale: Dysrhythmias can be indicative of an underlying pathophysiologic disorder. Dysrhythmias can impair normal cardiac output and lead to serious patient complications. Dysrhythmias are not an indicator of life span, but they may certainly shorten a patient's life span. Dysrhythmias do not impair venous return, but they do impair cardiac output. Alone, dysrhythmias do not increase the severity of heart murmurs.

Correct Answer: B

Rationale: Spironolactone, a potassium-sparing diuretic, commonly causes hyperkalemia (B).