Rapid diuresis occurs particularly during days 2–5 postpartum because the sodium and water retention of pregnancy is reversed. — Azulay Chertok, 2013
Fluid and electrolyte balance is generally restored to non-pregnant homeostasis by 21 days postpartum. — Coad and Dunstall, 2011
📌 The midwife should ensure that the woman passes an adequate amount of urine within 6 hours following birth. — NICE, 2006
Reversed pregnancy sodium and water retention → rapid diuresis and restored fluid balance
★ Must-know
Reduced gastrointestinal muscle tone caused by progesterone and abdominal relaxation increase the likelihood of constipation following birth.
The first bowel movement usually occurs within 2–3 days postpartum. — Coad and Dunstall, 2011
Further detail
Reduced tone → constipation → bowel movement in 2–3 days
1. By approximately when is fluid and electrolyte balance generally restored to non-pregnant homeostasis after birth?
2. When does the first postpartum bowel movement usually occur?
3. Which physiological change increases a woman’s risk of constipation after birth?
Why does rapid diuresis occur during days 2–5 postpartum?
Because sodium and water retention of pregnancy is reversed.
By when is fluid and electrolyte balance restored postpartum?
By 21 days postpartum.
What causes reduced gastrointestinal muscle tone after birth?
Progesterone and abdominal relaxation cause reduced gastrointestinal muscle tone.
When does the first bowel movement usually occur postpartum?
Within 2–3 days postpartum.
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