A 28-year-old primigravida delivers a healthy 3.2 kg male infant vaginally after an 8-hour labor. The third stage of labor lasts 35 minutes. Immediately after expulsion of the placenta, the uterus is soft and boggy on abdominal examination. Vaginal bleeding is brisk, estimated at 800 mL in the first 10 minutes postpartum. Vital signs: BP 100/62 mmHg, HR 110/min, RR 22/min. Hemoglobin at admission was 11.2 g/dL. What is the most appropriate immediate next step in management?

Explanation

## Diagnosis: Atonic Postpartum Hemorrhage This patient presents with classic features of uterine atony—the most common cause of primary postpartum hemorrhage (accounts for 70–80% of cases). ### Clinical Features Pointing to Atony - **Soft, boggy uterus** on abdominal palpation (pathognomonic) - **Brisk vaginal bleeding** in immediate postpartum period - **Prolonged third stage** (>30 minutes increases risk) - **Primiparity** (risk factor for uterine atony) - **Vital signs show early hypovolemic shock** (tachycardia, borderline hypotension) ### Management Algorithm for PPH ```mermaid flowchart TD A[Postpartum Hemorrhage]:::outcome --> B{Uterus firm or boggy?}:::decision B -->|Boggy| C[Uterine Atony]:::outcome B -->|Firm| D[Rule out trauma/coagulopathy]:::action C --> E[Bimanual compression + Oxytocin]:::action E --> F{Bleeding controlled?}:::decision F -->|Yes| G[Continue uterotonic, monitor]:::action F -->|No| H[Add prostaglandins/ergot alkaloids]:::action H --> I{Still bleeding?}:::decision I -->|Yes| J[Consider balloon tamponade or OR]:::urgent I -->|No| K[Supportive care, transfusion]:::action ``` ### Why Oxytocin + Bimanual Compression is First-Line **Key Point:** Oxytocin causes sustained uterine contraction (tetanic effect), compressing bleeding vessels in the placental bed. Bimanual compression provides immediate mechanical hemostasis while the drug takes effect (onset ~1 minute IV). | Uterotonic | Mechanism | Onset | Duration | Notes | |---|---|---|---|---| | **Oxytocin** | G-protein coupled receptor → ↑ intracellular Ca²⁺ | 1 min (IV) | 30–60 min | First-line; safest profile | | Ergot alkaloid (methylergonovine) | α-adrenergic agonist → sustained contraction | 2–5 min | 3 hrs | Contraindicated in hypertension; risk of tetanic contraction | | Misoprostol | Prostaglandin F analogue | 10–15 min | 3–4 hrs | Slower onset; use if oxytocin unavailable | **High-Yield:** The **FIGO/WHO guideline** recommends oxytocin 10 units IM or IV as the first-line uterotonic for prevention and treatment of PPH due to atony. ### Clinical Pearl **Bimanual compression technique:** One hand in the vagina, fist against the anterior uterine wall; other hand on the abdomen compressing the uterus against the fist. This manually occludes the uterine vessels and allows time for oxytocin to work. ### Why Not the Other Options? - **Tranexamic acid alone** (option C): Useful as an *adjunct* (reduces transfusion need by ~30%), but NOT a substitute for uterotonic therapy in active atonic hemorrhage. Requires oxytocin first. - **Balloon tamponade** (option D): Reserved for *refractory* atony after failure of uterotonics and bimanual compression. Premature use delays definitive treatment. - **Hysterectomy** (option B): Extreme measure for life-threatening hemorrhage unresponsive to all medical/interventional measures; never first-line in a hemodynamically compensating patient. ## Summary The immediate priority is **uterine contraction + mechanical compression** to achieve hemostasis. Oxytocin 10 units IV + bimanual compression is the evidence-based, guideline-endorsed first step.