The nurse is caring for a patient with metabolic acidosis. Which laboratory findings will the nurse expect to support this diagnosis? (Select All That Apply)

pH less than 7.35

HCO3 less than 22 mEq/L

PaCO2 greater than 45 mmHg

PaO2 less than 80 mmHg

SpO2 greater than 95%

Answer and Explanation

Correct Answer : A,B,C

Choice A reason: A pH less than 7.35 indicates an acidic state, which is consistent with metabolic acidosis. The normal pH range is 7.35 to 7.45.

Choice B reason: HCO3 (bicarbonate) less than 22 mEq/L indicates a low level of bicarbonate, which is consistent with metabolic acidosis. Bicarbonate is a base, and lower levels indicate a loss of buffering capacity.

Choice C reason: PaCO2 greater than 45 mmHg is not a primary indicator of metabolic acidosis but can occur as a compensatory mechanism in response to respiratory acidosis. The primary indicators of metabolic acidosis are low pH and low bicarbonate.

Choice D reason: PaO2 less than 80 mmHg indicates hypoxemia but is not directly related to the diagnosis of metabolic acidosis. Hypoxemia can occur with various conditions, and while it may be present, it is not a defining characteristic of metabolic acidosis.

Choice E reason: SpO2 greater than 95% indicates normal oxygen saturation and is not relevant to the diagnosis of metabolic acidosis. Oxygen saturation primarily reflects respiratory function rather than acid-base balance.

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Correct Answer is A

Explanation

Choice A reason: Methotrexate is a disease-modifying antirheumatic drug (DMARD) that must be taken regularly as prescribed, not just during flares of joint pain. It helps to prevent disease progression and joint damage. This statement indicates a misunderstanding of the medication regimen and requires further teaching.

Choice B reason: Avoiding drinking alcohol while taking methotrexate is important because alcohol can increase the risk of liver damage, a potential side effect of methotrexate. This statement indicates proper understanding.

Choice C reason: Calling the provider if a sore throat or fever develops is important because methotrexate can suppress the immune system, increasing the risk of infections. This statement indicates proper understanding.

Choice D reason: Using contraception while taking methotrexate is crucial because methotrexate can cause birth defects. This statement indicates proper understanding.

A. Potassium supplements can cause irregular heart rhythm and must be avoided. B. Instruct the patient to take diuretics at bedtime to promote diuresis during the night. C. Notify the physician if weight increases by three pounds in one week. D. Administer diuretics in the morning and notify physician of decreased urine output.

Correct Answer is C

Explanation

Choice A reason: Potassium supplements can actually be important for patients on diuretic therapy, especially if they are taking loop diuretics like furosemide, which can cause potassium loss. However, it is important to monitor potassium levels and follow the physician's guidance on supplement use.

Choice B reason: Instructing the patient to take diuretics at bedtime is not recommended. Diuretics should be taken in the morning to avoid frequent urination during the night, which can disrupt sleep.

Choice C reason: Notifying the physician if weight increases by three pounds in one week is a key instruction for patients with heart failure. Rapid weight gain can indicate fluid retention and worsening heart failure, requiring prompt medical evaluation and adjustment of treatment.

Choice D reason: Administering diuretics in the morning and notifying the physician of decreased urine output is important, but the focus on notifying the physician about significant weight gain provides a more specific and actionable guideline for managing heart failure.

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