The patient has pulmonary artery hypertension. The nurse most anticipates hypertrophy of which cardiac structure will be seen on chest x-ray?

Several tenants from an apartment building are brought to the emergency department with concern for carbon monoxide poisoning. One patient presents with reddish-purple skin, a blood pressure of 94/48 mmHg, heart rate of 118 bpm, and altered consciousness (arouses when his name is shouted). The nurse anticipates testing will reveal which carbon monoxide level?

The patient with cobalamin deficiency requires prompt and effective treatment to prevent which conditions? Select all that apply.