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追加: 2026-05-26

Uterine contractions are the driving force behind labor, occurring spontaneously and causing pain that begins when contraction pressure reaches 25-30 mmHg; these contractions originate in one of the uterine horns (typically the right horn), propagate from top to bottom at 1-2 cm/sec, and follow a cyclical pattern that gradually increases in intensity from 30-35 mmHg to 50-55 mmHg while lengthening from 15-20 seconds to 30-40 seconds, with a triple decrease in pressure and duration from top to bottom, and typically numbering 70-180 contractions during labor.