Internal Medicine Videos & books

Correct Answer - B Ans: B. serum lithium Because of its effects on multiple body systems, including but not limited to renal, hematologic, and thyroid systems, appropriate baseline studies must precede the start of lithium therapy. The minimal tests to be done include serum creatinine, electrolytes, thyroid function tests, and a complete blood count with differential. Additionally, because of its cardiac effect, an ECG is indicated. Any woman thought to be pregnant should have a pregnancy test.

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A person is breathing rapidly due to fear of a situation, so the primary problem is respiratory. Rapid breathing leads to loss of CO2 and reduction of arterial PCO2 and alkalosis. Thus, this results in respiratory alkalosis. Causes of respiratory alkalosis: A. Central nervous system stimulation: 1. Pain 2. Anxiety, psychosis 3. Fever 4. Cerebrovascular accident 5. meningitis, encephalitis 6. Tumor 7. Trauma B. Hypoxemia or tissue hypoxia: 1. High altitude 2. Pneumonia, pulmonary edem