Mr. Casper, a 55-year-old patient with Gastroesophageal Reflux Disease (GERD), consumes about 16 Tums antacid tablets daily. An Arterial Blood Gas (ABG) test is conducted to evaluate his acid/base balance. The results are as follows: pH 7.46, CO2 46, PO2 86, HCO3 29, SaO2 97%. What is the interpretation of these results?

Uncompensated Respiratory Acidosis

Compensated Metabolic Acidosis

Partially Compensated Metabolic Alkalosis

Partially Compensated Respiratory Acidosis

Answer and Explanation

The Correct Answer is C

Choice A rationale:
Uncompensated Respiratory Acidosis is characterized by a low pH (less than 7.35) and a high pCO2 (greater than 45 mmHg). In this case, the pH is slightly elevated (7.46), making this option less likely.
While the pCO2 is elevated (46 mmHg), the body has begun to compensate, as evidenced by the elevated HCO3 (29 mEq/L). This partial compensation does not align with an uncompensated respiratory acidosis.
Choice B rationale:
Compensated Metabolic Acidosis would present with a normal pH (7.35-7.45) due to full compensation by the respiratory system. In this case, the pH is slightly elevated (7.46), which is not consistent with full compensation.
Additionally, the HCO3 is elevated (29 mEq/L), which is characteristic of metabolic alkalosis, not acidosis.
Choice C rationale:
Partially Compensated Metabolic Alkalosis is the most likely interpretation based on the ABG results. The pH is elevated (7.46), indicating alkalosis.
The HCO3 is also elevated (29 mEq/L), which is the primary cause of metabolic alkalosis.
The pCO2 is elevated (46 mmHg), which is a compensatory mechanism to try to normalize the pH. However, the compensation is not complete, as the pH is still slightly elevated.
This partial compensation is consistent with partially compensated metabolic alkalosis.
Choice D rationale:
Partially Compensated Respiratory Acidosis would present with a low pH (less than 7.35) and an elevated pCO2 (greater than 45 mmHg).
The HCO3 would also be elevated, but to a lesser degree than in metabolic alkalosis, as it's a secondary compensatory mechanism.
In this case, the pH is slightly elevated (7.46), making respiratory acidosis less likely.

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Correct Answer is ["A","B","F","G"]

Explanation

Rationale for A: Hemoglobin and Hematocrit
Hemoglobin (Hgb) of 6.8 g/dL is significantly below the normal range of 12-16 g/dL for women and 14-18 g/dL for men. This indicates severe anemia, which can cause several of the patient's reported symptoms, including shortness of breath, fatigue, dizziness, and intolerance to cold. It's crucial to address this promptly as severe anemia can lead to tissue hypoxia and organ damage.
Hematocrit (Hct) of 21.2% is also below the normal range of 36-46% for women and 41-50% for men. Hct measures the percentage of red blood cells in the blood, and its low value further confirms the presence of anemia.

Rationale for B: Blood Pressure 100/68, Respirations 24
Blood pressure of 100/68 mmHg is considered low, especially in a patient with a history of hypertension. This could be due to the anemia, as low red blood cell count can decrease blood volume and subsequently lower blood pressure. It's essential to monitor the patient's blood pressure closely, as hypotension can lead to dizziness, fainting, and even shock.
Respirations of 24 breaths per minute are slightly elevated above the normal adult range of 12-20 breaths per minute. This could be a compensatory mechanism for the anemia, as the body tries to increase oxygen intake. However, it could also indicate other underlying respiratory issues that need to be investigated.

Rationale for F: Shortness of breath with exertion
Shortness of breath (dyspnea) is a common symptom of anemia, as the body struggles to deliver enough oxygen to tissues during physical activity. This symptom warrants immediate attention, as it can significantly impact the patient's quality of life and could potentially signal worsening anemia or other cardiopulmonary problems.

Rationale for G: Dizziness when standing
Dizziness upon standing (orthostatic hypotension) is a sign of low blood pressure, which can be exacerbated by anemia. This can increase the risk of falls and injuries, especially in a patient with other health conditions. It's crucial to address this symptom to prevent potential complications.

A. Benign tumors have lost their cellular regulation from contact inhibition. B. Benign tumors typically grow in the wrong place or at the wrong time. C. Benign tumors grow through invasion of other tissue. D. The loss of characteristics of the parent cells is referred to as anaplasia.

Correct Answer is B

Explanation

Choice B rationale:
Benign tumors typically grow in the wrong place or at the wrong time. This is a key distinguishing feature of benign tumors compared to normal cells. Normal cells have precise mechanisms that control their growth, ensuring they divide and multiply only when and where they are needed. Benign tumors, however, have disruptions in these regulatory mechanisms, leading to abnormal growth patterns. This means they may grow in locations where they don't belong or continue to grow even when they are no longer needed.
Here's a detailed explanation of why the other choices are incorrect:
Choice A:
Benign tumors have not lost their cellular regulation from contact inhibition. Contact inhibition is a process that stops normal cells from growing when they come into contact with other cells. Benign tumors still maintain this ability, which helps to limit their growth and prevent them from spreading to other tissues.
Choice C:
Benign tumors do not grow through invasion of other tissue. Invasion is a hallmark feature of malignant tumors (cancers). Benign tumors, on the other hand, typically grow as encapsulated masses, meaning they are surrounded by a well-defined border that separates them from surrounding tissues. They do not infiltrate or invade surrounding structures.
Choice D:
Anaplasia refers to the loss of differentiation and resemblance to the parent cells, which is a characteristic of malignant tumors, not benign tumors. Benign tumors still maintain a degree of differentiation, meaning they retain some of the characteristics of the normal cells from which they originated.

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Naxlex Comprehensive Predictor Exams

Correct Answer is ["A","B","F","G"]

Explanation

A nurse is studying the differences between normal cells and benign tumor cells. What information is included in this?

Correct Answer is B

Explanation

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