A woman was brought to the emergency department of a hospital after she fell and hurt her left leg. She is noted to be tachycardic and tachypneic. Painkillers were administered to lessen her pain. Suddenly, she started complaining that she is still in pain and now experiencing muscle cramps, tingling, and paresthesia. Measurement of arterial blood gas reveals pH 7.6, PaO2 120 mm Hg, PaCO2 31 mm Hg, and HCO3 25 mmol/L. What does this mean?