Comprehensive Study Notes on Obstetric Emergencies and Their Management

Introduction to Obstetric Emergencies

• Obstetric emergencies are defined as sudden, life-threatening conditions involving the mother and/or the fetus that occur during pregnancy, childbirth, or the postpartum period (specifically the first $42 \text{ days}$ after delivery). These situations require immediate medical intervention.
• While most pregnancies and births proceed without issues, every pregnancy carries an inherent risk. Approximately $15\%$ of pregnant women develop life-threatening complications requiring urgent obstetric care.
• Global statistics from $2015$ show that approximately $303,000$ women died due to pregnancy, childbirth, or postpartum complications. About $99\%$ of these maternal deaths occurred in developing countries.
• The early identification and management of these emergencies are crucial, with nurses playing a critical role in the process.

Classifications of Obstetric Emergencies

• The presentation categorizes obstetric emergencies into three main groups:     - Pregnancy-Related Emergencies: Hemorrhages, hypertensive emergencies, preterm labor/birth, premature rupture of membranes (PROM) and cord prolapse, and venous thromboembolism.     - Birth and Postpartum Emergencies: Amniotic fluid embolism (AFE), shoulder dystocia, and postpartum hemorrhage (PPH).     - Other Emergencies: Trauma, acute abdomen (severe abdominal pain), infection, sepsis, fever, and perimortem cesarean delivery (PMCD).

Hemorrhages in Early Pregnancy ($<22 \text{ Weeks}$)

• Vaginal bleeding affects approximately $20\%$ of pregnant women, especially in early stages. It is a major cause of maternal mortality and a sign of serious underlying pathology.
• Approximately $530,000$ women die annually worldwide due to pregnancy and birth complications, many attributed to obstetric hemorrhage.
• Abortus (Miscarriage): Defined as the termination of pregnancy before $20 \text{ weeks}$ or when the fetus weighs less than $500 \, \text{g}$.     - $50-70\%$ of all pregnancies are lost at a very early stage. $10-15\%$ of clinically diagnosed pregnancies end in spontaneous abortion, usually within the first $12 \text{ weeks}$.
• Types of Spontaneous Abortus:     - Abortus Imminens (Threatened Abortion): Mild vaginal bleeding and light uterine cramps during the first half of pregnancy. The cervical os remains closed. No tissue loss or membrane rupture occurs. In $50\%$ of cases, bleeding resolves in a few days.     - Abortus Incipiens (Inevitable Abortion): Characterized by moderate bleeding, cramp-like lower abdominal pain, and cervical dilation ($1.5 \, \text{cm}$ or more). No tissue has passed yet, but the prognosis is poor.     - Incomplete Abortus: Some products of conception remain in the uterus (often the placenta remains after the fetus is expelled). Characterized by tissue loss, bleeding, pain, and the cervical os remains open.     - Complete Abortus: All products of conception (fetus, membranes, placenta) are expelled. Bleeding and pain cease, and the cervix closes.     - Missed Abortus: The dead fetus remains in the uterine cavity for more than one month.     - Blighted Ovum (Anembryonic Pregnancy): A gestational sac is visible on ultrasound, but no fetal structures are detected.

Research Findings and Management of Early Hemorrhage

• Akdaœ Reis et al. (2022) Study: A retrospective study compared outcomes based on the trimester of Abortus Imminens diagnosis:     - Case distribution: $75.8\%$ in the first trimester vs. $25.2\%$ in the second trimester.     - First trimester outcomes: $31.5\%$ abortus, $11.9\%$ preterm birth, $56.6\%$ term birth.     - Second trimester outcomes: $17.7\%$ abortus, $21.1\%$ preterm birth, $61.2\%$ term birth.     - Second trimester cases showed higher rates of late complications: hypertensive disease ($6.2\%$), intrauterine growth restriction ($4.8\%$), preterm PROM ($9.1\%$), and placenta previa ($1.9\%$).
• Emergency Management of Early Bleeding:     - For Abortus Imminens: Assess vital signs; if bleeding decreases, advise bed rest and avoidance of sexual intercourse.     - For Incomplete Abortus: If the uterus is not cleared and pregnancy is $<12 \text{ weeks}$, perform evacuation. If immediate evacuation isn't possible, start an infusion of $40 \text{ units}$ of oxytocin in $1000 \, \text{cc}$ fluid at $40 \text{ drops/min}$.     - For Complete Abortus: Monitor for severe bleeding; perform ultrasound. Usually, evacuation is not needed; provide prophylactic antibiotics.

Gestational Trophoblastic Diseases (GTD) and Ectopic Pregnancy

• Molar Pregnancy: Excessive proliferation of trophoblastic tissue. Chorionic villi appear as cystic, edematous "grape-like" clusters. Symptoms include dark brown or "plum juice" colored vaginal bleeding (starting as early as $4 \text{ weeks}$ and continuing through the second trimester).     - Management: Vacuum aspiration of the uterus. Start $40 \text{ units}$ oxytocin in $1000 \, \text{cc}$ fluid at $60 \text{ drops/min}$ to prevent bleeding.
• Ectopic Pregnancy: Implantation outside the endometrial cavity. It is a leading cause of first-trimester mortality.     - Implantation sites: Fallopian tubes ($95\%$), abdominal cavity ($3-4\%$), cervix ($<1\%$), ovaries ($1\%$).     - Rupture symptoms: Weakness, rapid/weak pulse, orthostatic hypotension, hypovolemia, knife-like abdominal pain, rebound tenderness, and paleness.     - Management: Emergency surgery and possible blood transfusion if ruptured.

Late Pregnancy Hemorrhages ($>22 \text{ Weeks}$)

• Placenta Previa: Placenta implants over or near the cervical os. Characterized by painless vaginal bleeding. Types: Totalis (covers os completely) and Marginalis (within $2-3 \, \text{cm}$ of the os).
• Ablatio Placenta (Placental Abruption): Premature separation of a normally implanted placenta. Often presents with painful vaginal bleeding, abdominal pain, and abnormal fetal heart rate. It can lead to fetal death and Disseminated Intravascular Coagulation (DIC).
• Vasa Previa: Fetal vessels run through amniotic membranes over the cervical os. Sudden vaginal bleeding occurs, leading to high fetal mortality risk if not managed immediately.
• Emergency Management: Rapid vital sign assessment. Measure fundal height and fetal heart sounds. If placenta previa or abruption is suspected, open an IV line immediately and start Ringer's Lactate or isotonic solution.

Hypertensive Emergencies in Pregnancy

• Hypertension complicates approximately $10\%$ of pregnancies. Globally, it causes $14\%$ of maternal deaths (second leading cause). In Turkey, it is responsible for $15.5\%$ of maternal deaths.
• Preeclampsia: Hypertension and proteinuria (or organ dysfunction without proteinuria) developing after $20 \text{ weeks}$ of gestation.     - Diagnosis criteria: Sistolik $\ge 140 \, \text{mmHg}$ and/or Diyastolik $\ge 90 \, \text{mmHg}$ (two measurements $4 \text{ hours}$ apart). A single measurement of Sistolik $\ge 160 \, \text{mmHg}$ or Diyastolik $\ge 110 \, \text{mmHg}$ is also diagnostic.     - Proteinuria: $\ge 300 \, \text{mg}$ in $24 \text{ hours}$ or a protein/creatinine ratio $\ge 0.3$.
• Severe Preeclampsia Criteria:     - Blood pressure: $\ge 160/110 \, \text{mmHg}$.     - Trombositopeni: Platelets $<100,000/μ L$.     - Renal Failure: Serum creatinine $>1.1 \, \text{mg/dL}$.     - Liver Dysfunction: Transaminases at least twice the normal level.     - Lung: Pulmonary edema.     - Neurological: Persistent cerebral or visual symptoms, severe headache.
• HELLP Syndrome: A severe form of preeclampsia involving $Hemolysis$, $Elevated   Liver   enzymes$ (AST/ALT twice normal), and $Low   Platelet   count$ ($<100,000$).
• Eclampsia: Tonic-clonic, focal, or multifokal seizures in a patient with preeclampsia, not caused by other factors like epilepsy.     - Warning signs: Severe headache, visual disturbances, restlessness, and epigastric pain.     - Phases: Tonic phase (stiffening) followed by Clonic phase (rhythmic contractions). Respiration may stop during the seizure, often followed by a coma.

Management of Hypertensive Emergencies

• The definitive treatment is delivery. Aim to stabilize and deliver within $12 \text{ hours}$.
• Magnesium Sulfate ($MgSO_4$) Protocol: Used to reduce neuromuscular irritability and prevent seizures.     - Loading dose: $4-6 \, \text{g}$ IV over $20-30 \text{ minutes}$.     - Maintenance dose: $2 \, \text{g/h}$ IV infusion, continued for $24 \text{ hours}$ postpartum.     - Therapeutic serum level: $4-8 \, \text{mg/dL}$.
• Toxicity and Antidote:     - Toxicity signs: Loss of patellar reflex, urine output $<30 \, \text{ml/h}$, respiration rate $<14 / \text{min}$, low blood pressure.     - Antidote: Calcium Gluconate.
• Blood Pressure Management: If Diyastolik BP $>110 \, \text{mmHg}$, start anti-hypertensives. Aim to lower it below $100 \, \text{mmHg}$ but above $90 \, \text{mmHg}$.
• General Care: Left lateral position, quiet environment, Foley catheter to monitor urine and proteinuria. Provide oxygen at $4-6 \, \text{L/min}$.

Preterm Birth and Labor

• Preterm birth is defined by the World Health Organization (WHO) as live birth before $37 \text{ weeks}$ of gestation.
• Subgroups:     - Extremely preterm: $<28 \text{ weeks}$.     - Very preterm: $28-32 \text{ weeks}$.     - Moderate to late preterm: $32-37 \text{ weeks}$.
• Incidence: In $2020$, $13.4 \text{ million}$ babies were born premature ($>1 \text{ in } 10$ babies). Approximately $900,000$ deaths occurred in $2019$ due to preterm complications.
• Etiology:     - Uterine overdistension: Multiple pregnancy, polyhydramnios.     - Decidual hemorrhage: Vaginal bleeding or retroplacental hematoma causing vessel damage.     - Cervical insufficiency: Inability of the cervix to maintain pregnancy without contractions.     - Early activation of the HPA axis: Fetal stress, maternal anxiety, or depression.
• Preterm Labor Diagnosis: Regular painful contractions with cervical dilation and $>80\%$ effacement. Cervical dilation $\ge 3 \, \text{cm}$ with regular contractions confirms diagnosis.
• Mitrogiannis et al. (2023) Risk Factors: Strong evidence for amphetamine use, single umbilical artery, maternal personality disorder, sleep apnea, previous vacuum aspiration abortion, insufficient weight gain, and pregnancy interval $<6 \text{ months}$.
• Prevention and Acute Care:     - Vaginal progesterone may reduce risk in singleton pregnancies with a history of preterm birth, though its effectiveness is debated (Conde-Agudelo & Romero, 2022).     - Management: Bed rest, IV hydration ($3 \, \text{L}$ of $0.9\%$ saline or Ringer’s Lactate over $24 \text{ hours}$), corticosteroids (Betamethasone/Dexamethasone) for lung maturation, and magnesium sulfate for fetal neuroprotection if $<32 \text{ weeks}$.

PROM and Cord Prolapse

• Premature Rupture of Membranes (PROM): Rupture of membranes before the latent phase of labor. If the fetal head is not engaged, the umbilical cord may prolapse.
• Cord Prolapse: If the cord is compressed by the fetal head, fetal distress occurs. This is an absolute emergency.
• Management:     - If term and membranes ruptured: Delivery expected within $12 \text{ hours}$. Use induction if labor doesn't start.     - If preterm ($34-37 \text{ weeks}$): Induction may be started.     - If preterm ($<37 \text{ weeks}$): Hospitalize, monitor for infection (fever, uterine tenderness), use prophylactic antibiotics, and corticosteroids.     - If $<32 \text{ weeks}$: IV magnesium sulfate for neural protection.

Venous Thromboembolism (VTE) and Pulmonary Embolism (PE)

• Pregnancy increases VTE risk by $5-6$ times due to hypercoagulability (fibrinogen increases by $50\%$), decreased mobility, and pressure on the left iliac vein by the uterus.
• DVT Symptoms: Low-grade fever, swelling, edema, pain in calf or groin. Pain increases during dorsiflexion. Most cases occur in the left lower extremity.
• PE Symptoms (Complication of DVT): Dyspnea, tachycardia, chest discomfort, hemoptysis, cyanosis, and collapse. Oxygen saturation is low.
• Retrospective Study (Alsheef et al. 2020): $60\%$ of VTE cases occurred postpartum, $40\%$ antenatal. C-section ($47.8\%$) and obesity ($40.6\%$) were top risk factors. Maternal mortality was $1.1\%$.
• Management: Cardiopulmonary Resuscitation (CPR) if needed. Use IV morphine for pain/anxiety, Aminophylline for bronchial spasms, and Heparin to dissolve clots.

Amniotic Fluid Embolism (AFE)

• An emergency where amniotic fluid and fetal elements (hair, vernix, meconium) enter the maternal circulation via the placenta-amniotic interface.
• Characterized by: Hypoxia, hypotension, severe coagulopathy, DIC, and seizures.
• Mazza et al. (2022) Finding: Incidence of $6.0 \text{ per } 100,000$ births. Failing-to-rescue rate was $17\%$.
• Management: Correct hypoxia, maintain hemodynamic stability. Turn mother to the left hip to prevent vena cava compression. Ensure uterine tone to reduce bleeding. Transfer to ICU if needed.

Shoulder Dystocia

• Condition where fetal shoulders fail to pass through the pelvis after the head is born. Defined as a delay of $>60 \text{ seconds}$ between head and body delivery.
• Turtle Sign (Kaplumbaēa İœareti): The fetal head retracts against the perineum.
• Complications: Fetal brachial plexus injury ($14.6\%$ in one study), clavicle fracture ($9.6\%$), and hypoxic-ischemic encephalopathy.
• Primary Maneuvers:     - McRoberts Maneuver: Flexing the mother's legs toward the abdomen to flatten the sacrum.     - Suprapubic Pressure (Rubin I): Lateral and downward pressure above the pubic bone to dislodge the shoulder.
• Secondary Maneuvers:     - Posterior Arm Delivery: Reaching in to deliver the posterior arm to reduce biacromial diameter.     - Rubin II: Rotational pressure on the posterior aspect of the anterior shoulder.     - Wood's Maneuver: Rotating the fetus $180 \text{ degrees}$.     - Gaskin Maneuver: Moving the mother to an all-fours (hands and knees) position.
• Tertiary (Invasive) Maneuvers: Kleidotomy (breaking the clavicle), Symphysiotomy (cutting the pubic cartilage), and Zavanelli maneuver (pushing the head back for C-section).

Postpartum Hemorrhage (PPH)

• Responsible for $27\%$ of global maternal deaths. Defined by WHO as blood loss $\ge 500 \, \text{ml}$ within $24 \text{ hours}$ of birth.
• Etiology (The 4 Ts):     - Tone: Uterine atony ($70.6\%$ of cases) and inversion.     - Tissue: Retained placenta ($16.4\%$).     - Trauma: Lacerations, uterine rupture ($16.9\%$).     - Thrombin: Pre-existing or acquired coagulation disorders (e.g., HELLP, DIC).
• Prevention: Active management of the third stage of labor. Give $10 \text{ units}$ oxytocin IM/IV after birth. Early cord clamping. Monitor for blood loss for the first hour.
• Management:     - Fundal massage: Circular gentle pressure to stimulate contraction.     - Drugs: $10 \text{ units}$ Oxytocin IM. If unsuccessful in $5 \text{ mins}$, give $0.2 \, \text{mg}$ Methylergobasin. Follow with $20 \text{ units}$ oxytocin in $500 \, \text{cc}$ at $60 \text{ drops/min}$.     - Empty the bladder. Monitor vitals every $15 \text{ mins}$.

Trauma and Acute Abdomen

• Trauma: Affects $6-8\%$ of pregnancies. Causes include falls ($80.4\%$), assaults ($10.2\%$), and traffic accidents ($3.4\%$). Abdomen is the most affected region ($33.2\%$).     - Management: Ensure airway, provide oxygen ($10-15 \, \text{L/min}$). If in shock, give $1 \, \text{L}$ fluid in $20 \text{ minutes}$.
• Acute Abdomen: Severe pain appearing in $<24 \text{ hours}$.     - Non-obstetric cause: Acute appendicitis is most common ($25-30\%$), followed by intestinal obstruction.     - Obstetric causes: Ectopic pregnancy, abruption, uterine rupture.

Sepsis and Fever

• Maternal Sepsis: Organ dysfunction following infection. Third leading cause of maternal death. Use qSOFA score for rapid assessment:     - Mental state change ($1 \text{ point}$)     - Respiratory rate $>22 / \text{min}$ ($1 \text{ point}$)     - Sistolik BP $<100 \, \text{mmHg}$ ($1 \text{ point}$)     - Score $\ge 2$ indicates the need for ICU transfer.
• Septic Shock: Hypotension despite $30 \, \text{ml/kg}$ fluid resuscitation and lactate $>2 \, \text{mmol/L}$. Use vasopressors (e.g., Noradrenaline $0.1-1.3 \, μ g/kg/min$).
• Management of Fever: Defined as axillary temp $\ge 38 \, ^\circ C$. Start broad-spectrum antibiotics within $1 \text{ hour}$ if sepsis is suspected.

Perimortem Cesarean Delivery (PMCD)

• A life-saving intervention during maternal cardiac arrest (also called resuscitative hysterotomy).
• The 4-Minute Rule: If circulation is not restored after $4 \text{ minutes}$ of effective CPR, perform the delivery within the $5^{th} \text{ minute}$.
• Aimed at gestations $>23-24 \text{ weeks}$. After $30 \text{ weeks}$, fetal survival remains possible even if the $5 \text{ minute}$ window is exceeded.
• Technique: Continuous CPR during the procedure. Manual Left Uterine Displacement (LUD). Use a vertical incision from fundus to symphysis pubis.

Role and Responsibilities of Nurses in Obstetric Emergencies

• Early Recognition: Monitoring and identifying deviations in blood pressure, pulse, respiration, temperature, and oxygen saturation.
• Fetal Surveillance: Monitoring fetal heart sounds and reporting changes.
• Clinical Interventions: Initiating IV lines, administering fluids/medications (oxytocin, magnesium sulfate), and providing oxygen supply.
• Patient Safety & Coordination: Effective team communication, preparing equipment for maneuvers (like in shoulder dystocia), and ensuring proper documentation (vital for avoiding malpractice claims).
• Psychosocial Support: Reducing anxiety in patients and families (anxiety levels are noted to be high in emergency admissions, with average state-trait scores around $43-44$).
• Demirtaœ Alpsalaz & Yaēmur (2025) Study: Found that nurse knowledge of obstetric emergencies is generally low, especially if they haven't worked in maternity wards or attended specific training. Increased in-service training is recommended.