Following a prolonged transcontinental flight, a traveler is brought to the urgent care clinic reporting sudden, sharp chest pain and severe shortness of breath. Initial assessment reveals a heart rate of 122 beats per minute, a blood pressure of 98/80 mmHg, and a respiratory rate of 32 breaths per minute. Arterial blood gas (ABG) analysis on room air demonstrates a of 7.54, of 26 mmHg, of 54 mmHg, and of 23 mEq/L. Which physiological adaptations accurately reflect this client's current presentation? (Select all that apply)
- Reduced ventricular stroke volume secondary to acute right heart strainCevap
- Alveolar hyperventilation resulting in a primary uncompensated respiratory alkalosisCevap
- CA rightward shift in the oxyhemoglobin dissociation curve due to the current arterial pH
- DLoss of compensatory sympathetic tone resulting in an expected widening of the pulse pressure
Cevap
The accurate physiological adaptations are reduced ventricular stroke volume due to acute right heart strain and an uncompensated respiratory alkalosis driven by alveolar hyperventilation.
The clinical picture strongly suggests an acute pulmonary embolism leading to obstructive shock. The significant narrowing of the pulse pressure (98 - 80 = 18 mmHg) coupled with tachycardia demonstrates reduced ventricular stroke volume from right heart strain and subsequent compensatory sympathetic vasoconstriction. Additionally, the severe tachypnea (32 breaths/min) has caused excessive elimination of , resulting in a high (7.54) and low (26 mmHg) with normal bicarbonate, which defines an uncompensated respiratory alkalosis.
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Anahtar Kavram
Physiological adaptation to acute pulmonary embolism involves obstructive shock hemodynamics (narrow pulse pressure, tachycardia) and uncompensated respiratory alkalosis.