A very anxious patient presents with dizziness, perioral and extremity paresthesias, and tachypnea. This presentation is most consistent with:

• A. Bronchial Asthma
• B. Hyperventilation Syndrome
• C. Spontaneous Pneumothorax
• D. Emphysema

Answer: (B)

The main idea is hyperventilation syndrome from anxiety. When someone breathes rapidly, they blow off CO2 faster than the body can produce it, leading to respiratory alkalosis. This causes dizziness from cerebral vasoconstriction and tingling around the mouth and in the extremities due to the rise in pH and the resulting shift in calcium binding (lower ionized calcium). Tachypnea fits with an anxious, hyperventilating patient, making this the most consistent explanation for the symptoms.

Bronchial asthma and spontaneous pneumothorax would typically present with different signs—wheezing or unilateral chest pain with decreased breath sounds, respectively—rather than the characteristic paresthesias and dizziness from low CO2. Emphysema is a chronic condition with progressive dyspnea, not an acute anxious presentation with perioral tingling.

In short, rapid, anxiety-driven breathing lowers CO2, produces respiratory alkalosis, causes paresthesias and dizziness, and fits the clinical picture best. Management focuses on calming the patient and re-establishing normal breathing patterns.