A 28-year-old primigravida delivers a healthy 3.2 kg male infant vaginally after an 8-hour labour. The third stage of labour is managed with oxytocin 10 IU IM. At 45 minutes postpartum, the uterus is soft and boggy on abdominal examination. Vaginal bleeding is brisk, estimated at 800 mL so far. Vital signs: BP 100/62 mmHg, HR 108/min, RR 20/min. Hemoglobin is 9.2 g/dL (baseline 11.5 g/dL). The placenta has been expelled completely and appears intact. What is the most appropriate next step in management?

Explanation

## Clinical Diagnosis This patient has **primary postpartum hemorrhage (PPH)** — defined as blood loss >500 mL in the first 24 hours after vaginal delivery. The clinical presentation is classic: - Soft, boggy uterus (atony) - Brisk vaginal bleeding - Hemodynamic compensation (tachycardia, borderline BP) - Completed third stage with intact placenta ## Management Algorithm for Atonic PPH ```mermaid flowchart TD A[PPH with Soft Uterus]:::outcome --> B[Empty bladder]:::action B --> C[Uterine massage]:::action C --> D[Oxytocin infusion]:::action D --> E{Response in 15-20 min?}:::decision E -->|Yes| F[Continue infusion]:::action E -->|No| G[Add ergot alkaloid or misoprostol]:::action G --> H{Bleeding controlled?}:::decision H -->|Yes| I[Observe, transfuse if Hb <7]:::action H -->|No| J[Manual uterine exploration or laparotomy]:::urgent ``` ## Why Oxytocin Infusion Is First-Line **Key Point:** Uterine atony accounts for 80% of primary PPH. The standard stepwise approach is: 1. **Immediate measures:** Empty bladder, uterine massage, IV access, cross-matched blood 2. **Oxytocin infusion:** 10 IU in 500 mL NS at 40 mL/hr (or 10 IU IM if IV unavailable) 3. **If bleeding persists:** Add ergot alkaloid or misoprostol 4. **If still uncontrolled:** Manual exploration or laparotomy **High-Yield:** Ergot alkaloids (methylergonovine) are **contraindicated as first-line** because they cause sustained uterine contraction and can trap retained products. They are reserved for persistent atony after oxytocin failure. ## Why This Patient Is Not Yet Surgical **Clinical Pearl:** The patient is hemodynamically compensated (BP 100/62, HR 108). Estimated blood loss of 800 mL is significant but not immediately life-threatening. Manual exploration or laparotomy is indicated only if: - Bleeding persists despite oxytocin + ergot alkaloid - Suspicion of retained placenta or uterine rupture - Uncontrolled hemorrhage despite medical measures **Warning:** Do NOT jump to surgical intervention prematurely — most atonic PPH responds to oxytocin within 15–20 minutes. ## Transfusion Threshold Current hemoglobin is 9.2 g/dL (drop of 2.3 g/dL). Transfusion is typically considered if Hb <7 g/dL or if the patient becomes hemodynamically unstable. [cite:Williams Obstetrics 26e Ch 41]