The hemoglobin in red blood cells (RBCs) has a strong affinity for oxygen, and most oxygen (98

Choice A rationale

Choking typically presents with a universal distress signal, such as clutching the throat, and an inability to speak or breathe effectively. While gasping may occur in partial obstructions, a stooped gait and facial grimacing are more indicative of physical discomfort or musculoskeletal strain rather than an acute upper airway obstruction. The nurse should prioritize assessing for airway patency if choking is suspected, but the collective cues point elsewhere.

Choice B rationale

Anxiety often manifests through physiological signs like tachycardia, tachypnea, diaphoresis, or restless movements. While gasping can occur during a panic attack or hyperventilation, a stooped gait and facial grimacing are more classic indicators of physical pain. Anxiety is a psychological state that can influence physical presentation, but the nurse must first rule out a physical cause for the client's distorted posture and strained facial expressions during ambulation.

Choice C rationale

Depression is frequently associated with psychomotor retardation, slumped posture, and a flat affect or saddened facial expression. However, acute gasping and grimacing are less common unless the depression is accompanied by physical symptoms or somatic pain. While a stooped gait can reflect the heavy emotional toll of depression, the combination of all three nonverbal cues suggests a more immediate, acute physical stimulus requiring an assessment of pain levels.

Choice D rationale

Nonverbal cues are critical for identifying pain, especially when a client is moving. A stooped gait suggests the client is guarding a specific area, likely the abdomen or back, to minimize movement-related discomfort. Grimacing is a universal facial expression of distress, and gasping can occur as a reflexive response to sharp, sudden pain. The nurse should use a standardized pain scale to quantify the intensity and determine the location of the discomfort.

Choice A rationale

Capnography does not monitor body temperature, as its primary function is to measure the concentration of carbon dioxide in exhaled air. Body temperature is typically measured using thermometers or specialized probes to assess metabolic activity and thermoregulation. Relying on temperature to detect respiratory depression would be ineffective because changes in thermal status occur much slower than alterations in gas exchange or ventilation status during acute respiratory distress.

Choice B rationale

Capnography is more sensitive because it provides an immediate breath-by-breath assessment of ventilation by measuring end-tidal carbon dioxide levels. Unlike pulse oximetry, which measures oxygen saturation and can remain normal for several minutes even if breathing stops, capnography reflects changes in respiratory rate and depth instantly. This allows clinicians to detect hypoventilation or apnea much earlier than pulse oximetry, which is often delayed by the body's residual oxygen stores.

Choice C rationale

Capnography is not designed to measure blood pressure changes or hemodynamic stability directly. Blood pressure is a measure of the force of blood against arterial walls and is influenced by cardiac output and systemic vascular resistance. While respiratory failure can eventually lead to blood pressure changes due to hypoxia-induced cardiac stress, capnography focuses strictly on the ventilatory component of respiration by analyzing the infrared light absorption of carbon dioxide in the airway.

Choice D rationale

Heart rate is measured via pulse oximetry, electrocardiography, or manual palpation, but not via capnography. Capnography specifically tracks the partial pressure of carbon dioxide. While heart rate may increase or decrease in response to respiratory depression, it is a secondary sign of distress. Capnography remains the gold standard for monitoring the adequacy of ventilation because it identifies the cessation or reduction of airflow before cardiovascular changes or significant oxygen desaturation occurs in the patient.