The Henderson-Hasselbalch equation is used in acid-base analysis to relate which of the follow-ing?
a. pH to PCO2 c. Carbonic acid (H2CO3) to HCO3–
b. pH to bicarbonate (HCO3–) d. PO2 to oxygen sat-uration
ANS: B
A modified version of the Henderson-Hasselbalch equation is used in the PCO2 electrode to relate the pH measured to the PCO2 of the blood. Therefore, the PCO2 is determined as a function of the change in pH of the bicarbonate solution in the PCO2 electrode.
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Mr. Henderson is a 64-year-old patient whose wife insisted that he have his hearing tested because he often does not hear her when she speaks to him. When you speak to him, he answers, but some of his answers do not seem appropriate, and you suspect that he has not heard you or has misinterpreted what you said. Which of the following actions can you take to help make sure Mr. Henderson understands the questions you ask during the interview?
A. Speak more loudly B. Emphasize your lip movements C. Face the patient while speaking to him D. Speak more slowly E. Speak in clear, high-pitched tones