Your patient developed acute respiratory distress and was just emergently intubated.
Because of normal human anatomy, you understand that the most common misplacement of tube position is likely to be:
Into the cranial vault.
Left mainstem bronchus intubation.
Right mainstem bronchus intubation.
Duodenal intubation.
The Correct Answer is C
Choice A rationale
Intubation into the cranial vault is anatomically impossible during standard endotracheal intubation. The tube is designed to pass through the oral or nasal pharynx, larynx, and vocal cords into the trachea. The cranial vault is a completely separate anatomical structure, superior to the airway, protected by the skull, and has no direct communication with the respiratory tract for tube misplacement.
Choice B rationale
While left mainstem bronchus intubation can occur, it is less common than right mainstem intubation. The left mainstem bronchus branches at a more acute angle from the trachea compared to the right, making it less likely for an endotracheal tube, which typically follows a straighter path, to inadvertently enter. This anatomical difference reduces the incidence of left-sided misplacement.
Choice C rationale
The right mainstem bronchus branches off the trachea at a less acute angle and is a more direct continuation of the tracheal lumen compared to the left mainstem bronchus. This anatomical alignment makes it the most common site for inadvertent endotracheal tube misplacement, leading to ventilation of only the right lung and potential collapse of the left lung.
Choice D rationale
Duodenal intubation is an anatomical impossibility for an endotracheal tube. The duodenum is part of the gastrointestinal tract, located inferior to the stomach, and has no direct anatomical connection with the respiratory system. Endotracheal intubation is specifically designed for airway management, not gastrointestinal access.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A rationale
Cyanosis, a bluish discoloration of the skin and mucous membranes, is a late and ominous sign of hypoxia. It becomes clinically apparent when there are approximately 5 grams per deciliter of desaturated hemoglobin. This indicates a significant reduction in oxygen saturation and severe tissue hypoxia, representing a decompensated physiological state.
Choice B rationale
Bradycardia, a slower than normal heart rate (normal range 60-100 beats per minute for adults), is typically a late sign of hypoxia, particularly in adults. Initially, the body often compensates for hypoxia with tachycardia to increase cardiac output and oxygen delivery. Profound and prolonged hypoxia can depress myocardial function, leading to bradycardia.
Choice C rationale
Hypotension, a low blood pressure (normal range systolic 90-120 mmHg, diastolic 60-80 mmHg), is generally considered a late sign of hypoxia. In the early stages, the sympathetic nervous system may initially increase blood pressure as a compensatory mechanism. However, prolonged or severe hypoxia can lead to myocardial depression and vasodilation, resulting in hypotension.
Choice D rationale
Agitation is an early neurological sign of hypoxia. As oxygen levels decrease, cerebral hypoxia affects brain function, leading to irritability, restlessness, and confusion. The brain is highly sensitive to oxygen deprivation, and these behavioral changes are often among the first indicators of inadequate oxygenation, preceding more overt physiological decompensation.
Correct Answer is B
Explanation
Choice A rationale
Respiratory acidosis is characterized by a low pH and an elevated PaCO2. The patient's pH is elevated (7.61), indicating alkalosis, and the PaCO2 is low (22 mmHg). These findings are the opposite of what would be seen in respiratory acidosis.
Choice B rationale
The pH of 7.61 is significantly elevated, indicating alkalosis. The PaCO2 of 22 mmHg is markedly decreased below the normal range (35-45 mmHg). This decrease in carbon dioxide, a potent acid, directly causes the alkalosis. The bicarbonate (HCO3) level of 25 mEq/L is within the normal range (22-26 mEq/L), indicating that the renal system has not yet initiated any compensatory response. Therefore, this pattern is consistent with uncompensated respiratory alkalosis, primarily driven by hyperventilation.
Choice C rationale
Metabolic alkalosis would present with an elevated pH and an elevated bicarbonate level. While the pH is elevated, the bicarbonate (25 mEq/L) is within the normal range, and the PaCO2 is low, which is inconsistent with metabolic alkalosis as the primary imbalance.
Choice D rationale
Metabolic acidosis is characterized by a low pH and a low bicarbonate level. The patient's pH is high (alkalotic) and the bicarbonate is normal. This contradicts the diagnostic criteria for metabolic acidosis.
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