# Surgery in Pregnancy > Surgery in pregnancy for NEET-PG Surgery: appendicitis at the right test, laparoscopy safety, left lateral tilt, radiation limits, tocolysis rules. - Canonical URL: https://prepelephant.com/topics/neet-pg/surgery/surgery-in-pregnancy - Exam / course: NEET-PG · Subject: Surgery - Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team - First published: 2026-10-02 - Last updated: 2026-10-02 - How to cite: "Surgery in Pregnancy", PrepElephant, https://prepelephant.com/topics/neet-pg/surgery/surgery-in-pregnancy ## Direct answer About one to two in every hundred pregnancies involve non-obstetric surgery, appendicitis being the commonest emergency (around 1 in 1000-1500 pregnancies) and biliary colic and cholecystitis the next. The pregnant patient is not simply an adult with a gravid abdomen: the uterus compresses the inferior vena cava (hence the left lateral tilt after 20 weeks), physiological changes produce mild anaemia and a hypercoagulable state, and the appendix migrates from the right iliac fossa toward the right upper quadrant by the third trimester — so appendicitis presents atypically and is diagnosed late, with perforation and fetal loss rates rising. Laparoscopic surgery is considered acceptable in any trimester by current guidance when performed by experienced teams; radiation for imaging is kept under the widely quoted 50 milligray (5 rad) fetal threshold, with ultrasound and MRI (without gadolinium) preferred; and the answer to "when is the safest trimester for elective surgery" remains the second. ## What you must remember - **Physiological shifts that matter intraoperatively:** supine hypotension from aortocaval compression after 20 weeks — prevented by left lateral tilt; functional residual capacity falls with regurgitation risk (rapid-sequence induction); blood volume rises while haemoglobin dilutes; venous thromboembolism risk is several-fold higher, mandating thromboprophylaxis. - **Appendicitis behaves differently:** pain and tenderness shift toward the right flank or right upper quadrant as the trimester advances; delayed diagnosis drives perforation, and maternal peritonitis — not the operation — threatens the fetus; negative appendicectomy rates are therefore tolerated as the price of not missing it. - **Laparoscopy in pregnancy:** accepted in all three trimesters per society guidance, with entry adapted for fundal height, low pneumoperitoneum pressures and end-tidal CO2 monitoring — the old second-trimester-only dictum has given way to operating when the disease demands. - **Imaging rules:** ultrasound first, MRI without gadolinium second; CT when genuinely needed — a single abdominal CT is far below the 50 milligray fetal threshold commonly cited, and the danger of a missed diagnosis outweighs the theoretical risk. - **Drugs and anaesthesia:** no anaesthetic agent at clinical doses is proven teratogenic; avoid NSAIDs after 30 weeks (ductus closure) and first-trimester warfarin; heparin is the anticoagulant of choice. - **Fetal considerations perioperatively:** fetal heart rate documented before and after surgery (continuous monitoring perioperatively when viable), left lateral positioning, normocapnia and normotension — uteroplacental perfusion is the fetus's lifeline; tocolytics only for established preterm labour with obstetric input. - **Trauma caveat:** injury is the leading cause of non-obstetric maternal death; beyond 24 weeks perform a perimortaneous caesarean within four minutes of cardiac arrest to save mother and child. ## A typical exam case A 27-year-old at 26 weeks reports 24 hours of periumbilical pain localising not to the right iliac fossa but to the right flank, with anorexia and a white count of 15,000 — above the physiological ceiling of pregnancy. MRI without gadolinium shows an inflamed 9-millimetre appendix behind the ascending colon. She receives fluids, left lateral tilt on the table, thromboprophylaxis and rapid-sequence anaesthesia, and a laparoscopic appendicectomy with low-pressure pneumoperitoneum. Fetal heart tones are documented pre- and postoperatively, no tocolytics are used, and obstetrics co-manages steroids for lung maturity. She discharges on day two, pregnancy intact. Had she presented at 34 weeks with a perforated appendix, the operation may be open, the incision higher, and delivery decisions shared. ## Where students slip The exam repeatedly returns to three discriminations. First, the appendix position — a third-trimester stem with "right upper quadrant pain" lures candidates toward cholecystitis; the leukocytosis of pregnancy and the displaced appendix make appendicitis the safer answer when the story fits. Second, radiation panic — refusing a needed abdominal CT overstates the risk; the 50 milligray teaching exists to permit justified imaging, not forbid it. Third, the timing cliches — "never laparoscopy, never first trimester" — are outdated; the safest elective window remains the second trimester, and the four-minute perimortaneous caesarean rule is worth memorising cold. ## Frequently asked questions ### Which is the commonest non-obstetric surgical emergency in pregnancy? Acute appendicitis, occurring in roughly 1 in 1000-1500 pregnancies, with atypical presentation as the gravid uterus displaces the appendix toward the right upper quadrant. ### Why is the left lateral tilt used during surgery after 20 weeks? The gravid uterus compresses the inferior vena cava and aorta in the supine position, dropping venous return and cardiac output; a 15-30 degree left tilt off the vena cava preserves maternal and fetal perfusion. ### Is laparoscopic surgery safe during pregnancy? Yes, in all trimesters per contemporary society guidance, in experienced hands with adjusted port placement, lower pneumoperitoneum pressures and careful maternal carbon dioxide monitoring. ### What is the accepted fetal radiation threshold for diagnostic imaging? A cumulative fetal dose below about 50 milligray (5 rad) carries no demonstrated increased risk of malformation or loss — so single CT studies are permissible when the diagnosis demands them. ### When is a perimortaneous caesarean performed? In maternal cardiac arrest beyond about 24 weeks of gestation, the resuscitative hysterotomy is started within four minutes of arrest to maximise both maternal and fetal survival.