Normal Puerperium & Puerperal Complications

The puerperium is the 6-week interval after delivery during which the reproductive organs return to the pre-pregnant state and lactation is established. For NEET PG, the high-yield clusters are lochia types and duration, the day-wise causes of puerperal pyrexia, the organisms of puerperal sepsis (group A Streptococcus), mastitis vs breast engorgement, puerperal psychosis, and postpartum venous thromboembolism.

Definition & Time-frame

The puerperium ("childbed") begins immediately after expulsion of the placenta and conventionally lasts 6 weeks (42 days).

Phase	Duration	Key event
Immediate puerperium	First 24 hours	Risk of primary PPH, eclampsia, collapse
Early puerperium	Up to 7 days	Risk of secondary PPH, sepsis, DVT
Remote / late puerperium	7 days to 6 weeks	Involution complete, menstruation may return

High-yield: Uterus returns to the true pelvis by the end of 2 weeks (no longer palpable per abdomen) and to near pre-pregnant size (~50–60 g, from ~1000 g) by 6 weeks.

Physiological Changes

Uterine involution

• Weight falls from ~1000 g (immediately postpartum) → 500 g (1 week) → 300 g (2 weeks) → 60 g (6 weeks).
• Fundal height descends roughly 1.25 cm (one finger-breadth) per day; at the umbilicus immediately after delivery, half-way to symphysis by day 7, and impalpable abdominally by day 12–14.
• Mechanism: ischaemia, autolysis (proteolytic enzymes), and phagocytosis. Cells reduce in size, not number.

High-yield: "After-pains" (painful uterine contractions in early puerperium) are commoner in multiparae and during breastfeeding (oxytocin release).

Lochia (uterine discharge)

The single most repeated micro-topic.

Type	Days	Colour	Composition
Lochia rubra	1–4	Red	Blood, decidua, trophoblast, RBCs
Lochia serosa	5–9	Pale/brownish	Less RBC, more leucocytes, cervical mucus, organisms
Lochia alba	10–14 (up to 3–6 weeks)	Pale white/yellow	Leucocytes, decidual cells, mucus, cholesterol

• Normal total duration ≈ 3–4 weeks (may persist to 6 weeks). Average volume ~250 mL.
• Lochia has a peculiar fishy odour; an offensive smell suggests infection (sepsis/retained products).
• Persistent red lochia / lochia rubra beyond the normal period → suspect retained products or subinvolution.

High-yield: Lochial sequence to memorise → Rubra (red) → Serosa (pale) → Alba (white).

Other systemic changes

• Diuresis and weight loss occur in the first week (loss of pregnancy-related water retention).
• Cardiac output rises immediately after delivery (autotransfusion from the contracted uterus + relief of caval compression) and normalises by ~2 weeks; this is why the immediate postpartum period is dangerous in cardiac disease / mitral stenosis.
• Physiological leucocytosis (up to 25,000–30,000/mm³) and a hypercoagulable state persist — relevant to thromboembolism.
• Menstruation: in non-lactating women, returns by ~6–8 weeks; ovulation may occur as early as ~4 weeks. Lactating women have prolonged amenorrhoea (lactational amenorrhoea).

Lactation (brief, exam-relevant)

• Prolactin drives milk synthesis; oxytocin drives milk ejection ("let-down"), triggered by suckling and even by the infant's cry.
• Colostrum (first 2–3 days) is rich in IgA, protein, vitamin A, minerals; lower in fat/lactose than mature milk.
• Fall in oestrogen/progesterone after placental delivery removes inhibition of prolactin action → lactogenesis II (copious milk by day 3–4).

High-yield: Suckling → afferent impulses → hypothalamus → posterior pituitary oxytocin (milk ejection) and anterior pituitary prolactin (milk secretion). Oxytocin reflex can be conditioned; prolactin reflex cannot.

Puerperal Pyrexia — the classic question

Definition: A rise of temperature to 38°C (100.4°F) or more, measured orally on any 2 of the first 10 days postpartum (excluding the first 24 hours), taken at least 4 times daily.

The examiners love asking the likely cause based on the postpartum day:

Onset (postpartum day)	Most likely cause
Day 1–2	UTI; atelectasis/respiratory (after caesarean/anaesthesia)
Day 2–5 (often day 3–4)	Genital tract / endometritis (puerperal sepsis)
Day 4–5	UTI; wound infection (perineal/abdominal)
Day 7–10	Mastitis / breast abscess; thrombophlebitis (DVT)
Late / swinging	Deep pelvic abscess, septic pelvic thrombophlebitis

High-yield mnemonic — the "W"s of postpartum fever: Womb (endometritis), Wind (atelectasis/pneumonia), Water (UTI), Walk (DVT/thrombophlebitis), Wound (perineal/caesarean), Weaning/Wonder drugs (breast — mastitis; drug fever).

Stepwise workup of puerperal pyrexia: Clinical exam (uterus, breasts, calves, wound, chest) → urine routine + culture → blood culture, CBC → high vaginal/endocervical swab C&S → pelvic USG (retained products / abscess) → chest X-ray / Doppler as indicated.

Puerperal Sepsis (Genital Tract Infection)

Definition (WHO): Infection of the genital tract occurring at any time between rupture of membranes/labour and the 42nd day postpartum, with ≥2 of: pelvic pain, fever ≥38.5°C, abnormal/offensive discharge, delay in uterine involution.

Organisms

Usually polymicrobial (aerobes + anaerobes), commonly ascending from the lower genital tract.

Category	Organisms
Aerobes	Group A β-haemolytic Streptococcus (S. pyogenes) — most virulent/dangerous; Staph. aureus; E. coli; Klebsiella
Anaerobes	Bacteroides, Peptostreptococcus, Peptococcus, Clostridium perfringens
Others	Chlamydia trachomatis (late endometritis), Mycoplasma

High-yield: The classic exogenous, epidemic, most dangerous organism of puerperal sepsis is group A Streptococcus pyogenes — the agent behind historical "childbed fever" (Semmelweis, hand hygiene). E. coli is a common endogenous cause.

Risk factors

Prolonged/premature rupture of membranes, prolonged labour, repeated vaginal examinations, caesarean section (single biggest risk factor for endometritis), retained placental bits, anaemia, obstructed labour, instrumental delivery, low socio-economic status, pre-existing bacterial vaginosis.

Clinical features & spread

• Endometritis: fever, tachycardia, lower abdominal pain, sub-involuted tender uterus, offensive lochia.
• Spread routes → endometritis → myometritis → parametritis (pelvic cellulitis) → salpingitis/peritonitis → septicaemia/septic shock, and via veins → thrombophlebitis.

Management (drug of choice)

• Broad-spectrum IV antibiotics covering aerobes + anaerobes. The classic regimen for endometritis is clindamycin + gentamicin (gold standard); add ampicillin if Enterococcus suspected/no response. Continue until afebrile 24–48 h.
• Evacuate retained products (ultrasound-guided/gentle curettage after antibiotic cover).
• Drain pelvic abscess (colpotomy/posterior fornix or imaging-guided).
• Supportive: fluids, analgesia, anaemia correction; manage sepsis/shock per protocol.

High-yield: Empirical regimen for puerperal/post-caesarean endometritis = clindamycin + gentamicin (covers anaerobes + Gram-negatives).

Mastitis & Breast Engorgement

Feature	Engorgement	Mastitis (infective)	Breast abscess
Onset	Day 3–5 (lactogenesis II)	Usually week 2–3	Untreated mastitis
Cause	Vascular + milk stasis	Staph. aureus (from infant's nose) via cracked nipple	Pus collection
Side	Bilateral	Unilateral, segmental	Localised, fluctuant
Signs	Tense, tender, warm both breasts	Wedge-shaped red, hot, tender area; fever, flu-like	Fluctuant lump; persistent fever
Treatment	Continue feeding/expression, support, analgesia, cold packs	Continue breastfeeding + antibiotic (cloxacillin/dicloxacillin or cephalexin; clindamycin if MRSA)	Incision & drainage + antibiotics; feeding may continue from other breast

High-yield: Commonest organism of puerperal mastitis/breast abscess = Staphylococcus aureus, entering through a cracked nipple; source is the infant's oropharynx. Continue breastfeeding (or express) in mastitis — stopping worsens stasis and abscess formation.

Puerperal Venous Thromboembolism (DVT / PE)

• Pregnancy and puerperium are hypercoagulable (↑ fibrinogen, factors VII/VIII/X, ↓ protein S, venous stasis). The puerperium carries the highest per-day risk of VTE.
• Caesarean section markedly increases risk; other factors: obesity, age >35, immobility, thrombophilia, prior VTE, pre-eclampsia.
• DVT: unilateral leg pain, swelling, calf tenderness (left leg commoner due to iliac vein compression).
• Investigation of choice — DVT: compression Doppler ultrasonography; PE: CT pulmonary angiography (CTPA); D-dimer is unreliable (physiologically raised).
• Treatment: therapeutic LMWH (e.g., enoxaparin) — safe in lactation (warfarin and LMWH are both breastfeeding-compatible; heparins do not cross into milk significantly). Continue anticoagulation for the puerperium and beyond as indicated.

High-yield: Septic pelvic thrombophlebitis = persistent "picket-fence" swinging fever not responding to antibiotics after delivery, often with a tender pelvic vein/mass; diagnosis is often clinical/of exclusion; treat with antibiotics + therapeutic anticoagulation (heparin) — defervescence on heparin supports the diagnosis.

Puerperal (Postpartum) Psychiatric Disorders

Disorder	Onset	Features	Management
Postpartum (maternity) blues	Day 3–5, peaks day 5	Tearfulness, lability, anxiety; self-limiting (<2 weeks); very common (~50–70%)	Reassurance, support; no drugs
Postpartum depression	Within first 4–6 weeks (up to 1 yr)	Persistent low mood, anhedonia, guilt, poor bonding; lasts >2 weeks	SSRIs (sertraline preferred in lactation), psychotherapy
Puerperal psychosis	Typically within first 2 weeks (often day 3–14)	Psychiatric emergency: delusions, hallucinations, confusion, risk of suicide/infanticide	Hospitalise; antipsychotics ± mood stabilisers, ECT (rapid, effective); ensure baby safety

High-yield: Incidence of puerperal psychosis ≈ 1–2 per 1000 deliveries; commonest in primiparae and strongly associated with bipolar disorder. It is a psychiatric emergency because of infanticide/suicide risk.

Other Puerperal Problems (quick recall)

• Secondary PPH: abnormal bleeding after 24 h up to 6 weeks; commonest cause = retained products of conception / subinvolution of placental site; also endometritis. USG; antibiotics + uterotonics; evacuation if retained products.
• Subinvolution: uterus larger/softer than expected for the day, with persistent red lochia. Causes — retained products, infection, fibroid, full bladder.
• Urinary retention / overflow incontinence: common after instrumental delivery, regional anaesthesia, perineal trauma; catheterise.
• Breast — cracked nipple: correct latch; treat to prevent mastitis.
• Sheehan syndrome: postpartum pituitary necrosis after severe PPH/shock → failure of lactation (earliest sign, ↓prolactin) → amenorrhoea, hypothyroidism, hypocortisolism.

Diagnosis & Investigation Summary

• Endometritis/sepsis: clinical + raised CRP/leucocytes; high vaginal & endocervical swabs, blood and urine cultures; pelvic USG for retained products/abscess.
• DVT → Doppler USG; PE → CTPA.
• Subinvolution / secondary PPH → transvaginal USG (endometrial thickness/RPOC).
• Mastitis → clinical; abscess → USG confirms collection, guides drainage.

Key Differentials of Postpartum Fever

• Endometritis vs UTI vs wound infection vs mastitis vs DVT/septic thrombophlebitis vs respiratory infection — distinguished primarily by day of onset and focal signs (uterine tenderness, dysuria, red breast, calf swelling, productive cough).

Complications (overview)

• Septicaemia, septic shock, pelvic abscess, septic pelvic thrombophlebitis, peritonitis.
• Tubal blockage → secondary infertility (post-sepsis sequela).
• Pulmonary embolism (leading cause of direct maternal death in many series).
• Necrotising fasciitis (group A Strep) of perineal/abdominal wound — surgical emergency.

Recently asked / exam angle

• Day-wise cause of puerperal pyrexia — e.g., fever on day 3–4 → genital tract sepsis (endometritis); fever on day 7–10 → mastitis/thrombophlebitis. Repeatedly tested.
• Most dangerous organism of puerperal sepsis → Group A Streptococcus (S. pyogenes); commonest endogenous → E. coli; anaerobe → Bacteroides.
• Lochia matching: rubra (1–4 d, red), serosa (5–9 d), alba (10–14 d).
• Definition of puerperal pyrexia — 38°C on any 2 of first 10 days, excluding first 24 h.
• Commonest organism of mastitis → Staph. aureus; management = continue breastfeeding + cloxacillin; abscess → I&D.
• Puerperal psychosis onset (first 2 weeks), link to bipolar disorder, emergency management (ECT effective).
• Investigation of choice for postpartum DVT → compression Doppler USG; anticoagulant of choice → LMWH.
• Endometritis empirical antibiotics → clindamycin + gentamicin.
• Sheehan syndrome — first manifestation is failure of lactation.
• Time of uterine involution — impalpable per abdomen by ~2 weeks; weight ~60 g by 6 weeks.

Rapid revision

1. Puerperium = 6 weeks; uterus 1000 g → 60 g, impalpable abdominally by ~2 weeks.
2. Lochia: rubra (1–4 d) → serosa (5–9 d) → alba (10–14 d); offensive lochia = infection.
3. Puerperal pyrexia = ≥38°C on any 2 of first 10 days, excluding first 24 h.
4. Fever day 3–4 → endometritis; day 7–10 → mastitis / thrombophlebitis; W's mnemonic (Womb, Wind, Water, Walk, Wound, Weaning).
5. Most dangerous sepsis organism = Group A Streptococcus; common endogenous = E. coli; anaerobe = Bacteroides.
6. Endometritis treatment = clindamycin + gentamicin; biggest risk factor = caesarean section.
7. Mastitis organism = Staph. aureus via cracked nipple; keep breastfeeding + cloxacillin; abscess → I&D.
8. Postpartum blues day 3–5, self-limiting; psychosis within 2 weeks, emergency, linked to bipolar, ECT effective.
9. Puerperium = peak per-day VTE risk; DVT IOC = Doppler USG, PE = CTPA; treat with LMWH (lactation-safe).
10. Septic pelvic thrombophlebitis = swinging fever unresponsive to antibiotics → add heparin.
11. Secondary PPH (24 h–6 wk) commonest cause = retained products; investigate with TVS.
12. Sheehan syndrome after PPH → earliest sign failure of lactation, then hypopituitarism.