A patient reclined in the dental chair feels dizzy and faint immediately upon being raised to an upright position. This is most consistent with:

Orthostatic hypotension is a sudden drop in blood pressure when moving from supine to upright, causing transient cerebral hypoperfusion, dizziness, and possible syncope; it is common with antihypertensives and after prolonged reclining.Other options: A hypertensive crisis raises BP; hyperventilation causes tingling and carpopedal spasm from low CO2; MI presents with chest pain, not simple positional dizziness.Key exam takeaway: Raise the chair slowly and pause the patient upright before dismissal to prevent orthostatic syncope.