A nurse is caring for a client who has the following arterial blood gas results: HCO3 18 mEq/L, PaCO2 28 mm Hg, and pH 7.30. The nurse recognizes the client is experiencing which of the following acid-base imbalances?
Metabolic alkalosis
Respiratory alkalosis
Respiratory acidosis
Metabolic acidosis
The Correct Answer is D
Choice A Reason:
Metabolic alkalosis is characterized by an elevated pH (greater than 7.45) and an increased bicarbonate (HCO3) level. In this case, the pH is 7.30, indicating acidosis, and the HCO3 level is 18 mEq/L, which is below the normal range (22-26 mEq/L). Therefore, metabolic alkalosis is not the correct diagnosis.
Choice B Reason:
Respiratory alkalosis is indicated by a high pH (greater than 7.45) and a low PaCO2 (less than 35 mm Hg). Although the PaCO2 is low at 28 mm Hg, the pH is 7.30, indicating acidosis rather than alkalosis. Therefore, respiratory alkalosis is not the correct diagnosis.
Choice C Reason:
Respiratory acidosis is characterized by a low pH (less than 7.35) and an elevated PaCO2 (greater than 45 mm Hg). In this case, the pH is low, indicating acidosis, but the PaCO2 is also low at 28 mm Hg, which does not fit the criteria for respiratory acidosis. Therefore, respiratory acidosis is not the correct diagnosis.
Choice D Reason:
Metabolic acidosis is indicated by a low pH (less than 7.35) and a low bicarbonate (HCO3) level (less than 22 mEq/L). In this case, the pH is 7.30, indicating acidosis, and the HCO3 level is 18 mEq/L, which is below the normal range. The low PaCO2 of 28 mm Hg suggests a compensatory respiratory response to the metabolic acidosis. Therefore, metabolic acidosis is the correct diagnosis.

Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["B","C","E","F"]
Explanation
Choice A Reason:
Weight gain is not typically associated with tuberculosis (TB). In fact, weight loss is a common symptom of TB due to the chronic nature of the infection and the body’s increased metabolic demands to fight the disease. Patients with TB often experience a loss of appetite and significant weight loss as the disease progresses.
Choice B Reason:
Low-grade fever is a common symptom of TB. The body’s immune response to the infection often results in a persistent low-grade fever, which can be one of the early signs of the disease. This fever is usually accompanied by other systemic symptoms such as night sweats and fatigue.
Choice C Reason:
Dyspnea, or difficulty breathing, can occur in patients with TB, especially if the infection has caused significant lung damage or if there is a large amount of fluid in the pleural space (pleural effusion). Dyspnea is a concerning symptom that indicates the need for further evaluation and treatment.
Choice D Reason:
Contusion, or bruising, is not a symptom associated with TB. TB primarily affects the lungs and can cause systemic symptoms, but it does not typically cause bruising. Contusions are more commonly associated with trauma or conditions that affect blood clotting.
Choice E Reason:
Lethargy, or a general sense of fatigue and weakness, is a common symptom of TB. The chronic nature of the infection and the body’s ongoing immune response can lead to significant fatigue. Patients with TB often feel tired and may have difficulty performing daily activities.
Choice F Reason:
Night sweats are a hallmark symptom of TB. Patients often experience drenching night sweats that can be quite severe. This symptom, along with fever and weight loss, is part of the classic triad of TB symptoms and is an important indicator for healthcare providers to consider TB in the differential diagnosis.
Correct Answer is B
Explanation
Choice A reason: An increase in temperature is not a primary indicator of hypovolemic shock. While fever can occur due to infection or inflammation, it is not directly related to hypovolemic shock, which is primarily characterized by a significant loss of blood or fluids leading to decreased perfusion and oxygenation of tissues.
Choice B reason: A decrease in urinary output is a critical sign of hypovolemic shock. When the body loses a significant amount of blood or fluids, the kidneys receive less blood flow, leading to reduced urine production. This is a compensatory mechanism to conserve fluids and maintain blood pressure. Normal urine output is typically around 30 to 50 mL per hour, so a drop below this range is concerning.
Choice C reason: An increase in heart rate is a common response to hypovolemic shock as the body attempts to maintain cardiac output and blood pressure despite the loss of blood volume. Tachycardia (increased heart rate) is one of the early signs of shock, indicating that the heart is working harder to pump blood to vital organs.
Choice D reason: A decrease in respiratory rate is not typical of hypovolemic shock. In fact, hypovolemic shock often leads to an increased respiratory rate (tachypnea) as the body tries to compensate for decreased oxygen delivery to tissues. A decrease in respiratory rate could indicate other issues but is not a hallmark of hypovolemic shock.
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