Immediate Obstetric Emergency Requiring Urgent Evaluation and Likely Cesarean Delivery

Critical Initial Assessment

The American College of Radiology recommends checking hemodynamic stability immediately by assessing vital signs, as tachycardia, hypotension, and tachypnea signal serious maternal-fetal compromise 1, 2
Continuous fetal heart rate monitoring should be performed to detect fetal distress, which may indicate placental abruption or uterine rupture 1
Assessment for peritoneal signs, such as guarding, rigidity, and rebound tenderness, is crucial as they suggest surgical emergency 1, 2
Evaluation for vaginal bleeding is essential, as it is a key indicator of placental abruption or other obstetric hemorrhage 1, 2
IV access should be established immediately if any signs of instability are present 3

Placental abruption is the most critical diagnosis in third-trimester severe abdominal pain, presenting with pain, vaginal bleeding, and uterine tenderness 1
Ultrasound sensitivity for placental abruption is only 40-50%, meaning normal imaging does not exclude this diagnosis 1
Clinical diagnosis based on pain severity, uterine tenderness, and fetal distress often supersedes imaging 1

Internal herniation in post-bariatric surgery patients requires immediate surgical consultation without delay, with maternal mortality of 9% and fetal mortality of 13.6% in case series 4
Appendicitis is the most common cause of non-obstetric abdominal pain requiring emergency surgery in pregnancy, presenting atypically due to anatomical displacement by the gravid uterus 1, 2, 3, 5
MRI has 97% sensitivity and 95% specificity for diagnosing appendicitis 1, 2

Obstetric ultrasound should be performed immediately to assess fetal viability, placental location, amniotic fluid, and fetal anatomy 1, 2, 3
MRI without contrast should be used if ultrasound is inconclusive and non-obstetric surgical pathology is suspected 2, 3, 5
CT with IV contrast should be reserved for life-threatening situations when diagnosis cannot be made by ultrasound or MRI, as benefits outweigh radiation risks when maternal or fetal life is threatened 1, 2, 5

If obstetric emergency is confirmed, emergency cesarean delivery should be performed immediately for placental abruption with fetal distress or uterine rupture 1
If surgical non-obstetric pathology is diagnosed, surgical intervention should not be delayed, and laparoscopic surgery is safe in the third trimester when feasible 2, 3, 4
Patient should be positioned in left lateral tilt during procedures to avoid aortic/IVC compression by the gravid uterus 2, 3

Severe abdominal pain should never be attributed to "normal pregnancy changes" without excluding serious pathology first 2
Imaging or surgical consultation should not be delayed due to concerns about radiation, as maternal and fetal outcomes worsen with delayed treatment 2, 4, 5
Clinical judgment should supersede negative imaging when excluding placental abruption 1

Magnetic resonance imaging (MRI) without contrast provides high diagnostic accuracy for appendicitis in pregnant patients, with a sensitivity of approximately 97 % and specificity of 95 % (American College of Radiology recommendation) 6.
When ultrasound is inconclusive, MRI correctly identifies the underlying cause of acute abdomen in about 83 % of pregnant patients, compared with roughly 55 % for ultrasound (American College of Radiology recommendation) 6.

Appendicitis is the leading non‑obstetric cause of acute abdomen requiring emergency surgery during pregnancy, and it often presents atypically because the enlarging uterus displaces the appendix (American College of Obstetricians and Gynecologists guideline) 6.
Immediate surgical consultation is advised when appendicitis is suspected in pregnancy; laparoscopic appendectomy is considered safe in the third trimester (American College of Obstetricians and Gynecologists guideline) 6.
Performing the indicated cholecystectomy or appendectomy during the same admission reduces the risk of readmission and does not increase the incidence of preterm delivery or miscarriage (American College of Surgeons recommendation) 6.
While elective abdominal surgery is preferably scheduled in the second trimester, emergency operative intervention should not be postponed regardless of gestational age (American College of Surgeons recommendation) 6.