Which dental patient situation could lead to a postural hypotension?

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Postural hypotension happens when standing up, and the blood pressure drops because blood pools in the legs and the body’s quick reflexes can’t compensate fast enough. In pregnancy, several cardiovascular changes make this more likely. Hormones like progesterone cause widespread vasodilation and lower systemic vascular resistance, while blood volume rises to support the fetus. This means the system has to work harder to maintain pressure when moving to an upright position. The uterus can also press on big veins, increasing venous pooling, especially in later pregnancy. Together, these factors can blunt the normal baroreceptor reflex, so standing after lying down or after dental treatment can lead to dizziness or lightheadedness. To reduce risk, rise slowly, use a seated position first, and monitor for symptoms; good hydration helps, and avoid prolonged lying flat in late pregnancy. Other triggers like dehydration or arrhythmias can cause similar drops, but pregnancy brings a set of changes that particularly predispose to this upright BP drop.