Changes in Intra-Amniotic, Fetal Intrathoracic, and Intraperitoneal Pressures with Uterine Contraction: A Report of Three Cases

Table 1

Results and literature review of intra-amniotic and fetal intrathoracic and intraperitoneal pressures.

Case	Diagnosis	GA at measurement; (weeks)	Intra-amniotic pressure (mmHg)			Intrathoracic pressure (mmHg)			Intraperitoneal pressure (mmHg)
			Before; R	After; R/baseline	With; UC	Before; R	After; R	With; UC	Before; R	After; R	With; UC
1	Polyhydramnios	22	16	9	29
2	Chylous ascites polyhydramnios	38							18	14	32
3	Chylothorax	22			20–22	30	19
Our control cases	Amniocentesis for chromosome analysis	16		10, 10
		18		10, 13
Yamamoto et al. 2007	Chylothorax polyhydramnios	31	21			39
				Baseline						Baseline
Nicolini et al. 1989	Intrauterine transfusion									2.5; (1.4–3.6)
Fisk et al. 1992		16		2.2–9.3
		18		2.2–9.5
		20		2.3–9.6
		22		2.3–9.7
		24		2.3–9.7
		26		2.3–9.8
		28		2.4–10.1
		30		2.5–10.6
		32		2.8–11.5
		34		3.2–13.1

GA, gestational age; R, removal of amniotic fluid; UC, uterine contraction; baseline, baseline pressure not related to amnioreduction.