Acute Abdomen in Pre..


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  • Alk phos is also elevated normally and BUN is decreased normally in pregnancy.
  • 5 rads = 5,000 mrads = 50 mGy = 0.05 Gy (1 rad = 10 mGy)
  • Fundal height at umbilicus at approx 20 weeks (halfway).
  • MRI is often use to evaluate placental pathology (such as accreta).
  • #1 non-obstetric operative indication during pregnancy
  • Dx – incompressible appendix c transverse diameter > 6mm (in this picture L is lumen, big arrow is fecolith, M is echogenic mesentery surrounding with inflammation)
  • Sxs: N/V, dyspepsia, intolerance of fatty foods, acute onset of colicky or stabbing pain in RUQ radiating to back
  • High CO2 pressures are concerning for decreased venous return, decreased cardiac output, and possible maternal and fetal acidosis  Animal studies have showed that ewes still deliver healthy babies though. Nitrous oxide could be used as an alternative gas as this causes less acidosis in animal studies.
  • Sepsis – you give corticosteroids until you get cosyntropin results back (some people will be non-responders, but it doesn’t affect them negatively)
  • Acute Abdomen in Pre..

    1. 1. Acute Abdomen in Pregnancy Kate Pettit, MS III June 18, 2007
    2. 2. The Most Important Equation + + =
    3. 3. How old are your prospective pregnant patients? CDC 2004 Live Births per 1,000 Women Avg Age at First Birth in US: 25.1 yrs
    4. 4. DDx of Abdominal Pain in Pregnancy <ul><li>Divided into three categories: </li></ul><ul><li>1) Conditions incidental to pregnancy </li></ul><ul><li>2) Conditions associated with pregnancy </li></ul><ul><li>3) Conditions due to pregnancy </li></ul>
    5. 5. Conditions Incidental to Pregnancy <ul><li>Acute appendicitis </li></ul><ul><li>Acute pancreatitis </li></ul><ul><li>Peptic ulcer </li></ul><ul><li>Gastroenteritis </li></ul><ul><li>Hepatitis </li></ul><ul><li>Bowel obstruction </li></ul><ul><li>Bowel Perforation </li></ul><ul><li>Herniation </li></ul><ul><li>Meckel’s Diverticulitis </li></ul><ul><li>Toxic megacolon </li></ul><ul><li>Pancreatic pseudocyst </li></ul><ul><li>Ovarian cyst rupture </li></ul><ul><li>Adnexal torsion </li></ul><ul><li>Ureteral calculus </li></ul><ul><li>Rupture of renal pelvis </li></ul><ul><li>Ureteral obstruction </li></ul><ul><li>SMA syndrome </li></ul><ul><li>Thrombosis/infarction </li></ul><ul><li>Ruptured visceral artery aneurysm </li></ul><ul><li>Pneumonia </li></ul><ul><li>Pulmonary embolus </li></ul><ul><li>Intraperitoneal hemorrhage </li></ul><ul><li>Splenic rupture </li></ul><ul><li>Abdominal trauma </li></ul><ul><li>Acute intermittent porphyria </li></ul><ul><li>Diabetic ketoacidosis </li></ul><ul><li>Sickle Cell Disease </li></ul>
    6. 6. Conditions Associated with Pregnancy <ul><li>Acute pyelonephritis </li></ul><ul><li>Acute cystitis </li></ul><ul><li>Acute cholecystitis </li></ul><ul><li>Acute fatty liver of pregnancy </li></ul><ul><li>Rupture of rectus abdominus muscle </li></ul><ul><li>Torsion of pregnant uterus </li></ul>
    7. 7. Conditions Due to Pregnancy <ul><li>Ectopic pregnancy </li></ul><ul><li>Septic abortion with peritonitis </li></ul><ul><li>Acute urinary retention due to retroverted uterus </li></ul><ul><li>Round ligament pain </li></ul><ul><li>Torsion of pedunculated myoma </li></ul><ul><li>Placental abruption </li></ul><ul><li>Placenta percreta </li></ul><ul><li>HELLP Syndrome </li></ul><ul><li>Acute Fatty Liver of Pregnancy </li></ul><ul><li>Uterine rupture </li></ul><ul><li>Chorioamionitis </li></ul>
    8. 8. Ectopic Pregnancy <ul><li>Classic Symptoms </li></ul><ul><ul><li>Abdominal pain </li></ul></ul><ul><ul><li>Amennorrhea </li></ul></ul><ul><ul><li>Vaginal Bleeding </li></ul></ul><ul><li>Diagnosis </li></ul><ul><ul><li>Transvaginal U/S (TVS) </li></ul></ul><ul><ul><ul><li>Presence of a true gestational sac at 4.5 to 5 wks is the 1 st sign of IUP. </li></ul></ul></ul><ul><ul><ul><li>Cardiac activity is first detected at 5.5 to 6 weeks. </li></ul></ul></ul><ul><ul><li>Serum quantitative HCG </li></ul></ul><ul><ul><ul><li>Absence of an intrauterine gestational sac at hCG concentrations >1500-2000 IU/L suggests an ectopic or nonviable intrauterine pregnancy </li></ul></ul></ul><ul><li>Management </li></ul><ul><ul><li>Option of medical vs surgical management if pt is hemodynamically stable and no rupture has occurred. </li></ul></ul><ul><ul><li>Emergent surgical management if rupture has occurred and/or patient is hemodynamically unstable </li></ul></ul><ul><li>Prognosis </li></ul><ul><ul><li>Ruptured ectopic pregnancies account for 4- 10 percent of all pregnancy related deaths. </li></ul></ul>
    9. 9. HELLP Syndrome Hemolysis – Elevated Liver Enzymes – Low Platelets <ul><li>Incidence: 1 in 1K pregnancies </li></ul><ul><li>Timing: Majority diagnosed at 28-36 wks </li></ul><ul><li>Labs :  Plts,  AST/ALT,  indirect bili,  haptoglobin, schistocytes on peripheral Smear </li></ul><ul><li>Management: </li></ul><ul><ul><li>Emergent delivery for pregnancies > 34 weeks, nonreassuring fetal status, severe maternal disease (multiorgan dysfunction, DIC, liver infarction or hemorrhage, ARF, or abruptio placenta) </li></ul></ul><ul><ul><li>Delayed delivery in stable pregnancies <34 wks after administration of corticosteroids </li></ul></ul>5 Jaundice 10-20 Visual changes 33-60 Headache 29-84 Nausea/Vomiting 40-90 RUQ/Epigastric pain 85 HTN (>140/90) 87 Proteinuria Frequency Sign/Sx
    10. 10. Acute Fatty Liver of Pregnancy <ul><li>Incidence: Rare (1 in 7K – 16K deliveries) </li></ul><ul><li>Timing: 2 nd half of pregnancy (usually 3 rd tri) Sxs : N/V (75%), epigastric abdominal pain (50%), anorexia, jaundice +/- signs of pre-eclampsia </li></ul><ul><li>Labs :  PT,  PTT,  AST/ALT,  Cr,  glucose, +/-  WBC, +/-  Plts </li></ul><ul><li>Tx : Maternal stabilization (glucose infusion, reversal of coagulopathy) and emergent delivery </li></ul>
    11. 11. Definition of Acute Abdomen <ul><li>Stedman's Medical Dictionary, 27th Edition defines acute abdomen as &quot;any serious acute intra-abdominal condition attended by pain, tenderness, and muscular rigidity, and for which emergency surgery must be considered.” </li></ul>
    12. 12. Epidemiology <ul><li>Incidence of acute abdomen during pregnancy is 1 in 500-635 </li></ul><ul><li># 1 Acute Appendicitis </li></ul><ul><li># 2 Acute Cholecystitis </li></ul>
    13. 13. Challenges of Diagnosis <ul><li>Symptoms </li></ul><ul><ul><li>Nausea, vomiting, and abdominal pain are common in the normal obstetric population. N/V are most common in weeks 4-16. </li></ul></ul><ul><li>Physical Exam </li></ul><ul><ul><li>Expanding uterus dislocates other intraabdominal organs. </li></ul></ul><ul><li>Labs </li></ul><ul><ul><li>Leukocytosis (10-20K) and anemia are common in normal pregnancies and thus, not as predictive of infection or blood loss. </li></ul></ul>
    14. 14. Which conditions require urgent surgical management in pregnancy? <ul><li>Trauma </li></ul><ul><li>Acute appendicitis </li></ul><ul><li>Intestinal obstruction </li></ul><ul><li>Perforated duodenal ulcer </li></ul><ul><li>Spontaneous visceral rupture </li></ul><ul><li>Ectopic pregnancy </li></ul><ul><li>Ovarian or uterine torsion </li></ul>
    15. 15. Timing of Surgery <ul><li>1 st trimester (wks 1-12) </li></ul><ul><ul><li>12% SAb rate </li></ul></ul><ul><li>2 nd trimester (wks 13-26) </li></ul><ul><ul><li>0 - 5.6% SAb rate </li></ul></ul><ul><ul><li>5% rate of preterm labor </li></ul></ul><ul><li>3 rd trimester (wks 27-40) </li></ul><ul><ul><li>30-40% rate of preterm labor </li></ul></ul>
    16. 16. Imaging Options <ul><li>U/S: No known adverse effects. </li></ul><ul><li>X-ray: Presence of adverse effects depends on total radiation dose. </li></ul><ul><li>CT: Presence of adverse effects depends on total radiation dose. </li></ul><ul><li>MRI: No known adverse effects. </li></ul><ul><li>ERCP: Only recommended for therapeutic use, not for routine imaging. </li></ul>
    17. 17. Radiation during pregnancy
    18. 18. Use of ERCP in Pregnancy American Society for Gastrointestinal Endoscopy Guidelines <ul><li>ERCP should only be used when therapeutic intervention is intended (usually for biliary pancreatitis, choledocholithiasis, or cholangitis). </li></ul><ul><li>Several studies have confirmed the safety of ERCP in pregnancy. </li></ul><ul><li>With precautions, fetal exposure is well below the 5- to 10-rad level. </li></ul><ul><ul><li>Kahaleh et al. reported an estimated fetal radiation exposure of 40 mrads (range 1-180 mrad). </li></ul></ul><ul><li>Precautions for reducing radiation exposure: </li></ul><ul><ul><li>Lead shields placed under the pelvis and lower abdomen, remembering that the x-ray beam originates from beneath the pt. </li></ul></ul><ul><ul><li>Use of brief ''snapshots'' of fluoroscopy to confirm cannula position and CBD. </li></ul></ul><ul><ul><li>Minimize total fluoroscopy time. </li></ul></ul>
    19. 19. Reducing Radiation in Pregnancy <ul><li>X-ray: PA exposures lowers the radiation dose by 2 to 4 mrad compared with the traditional AP exposures because the uterus is located in an anterior pelvic position. </li></ul><ul><li>CT: Narrow collimation and wide pitch (the patient moves through the scanner at a faster rate) results in a slightly reduced image quality, but provides a large reduction in radiation exposure. </li></ul>
    20. 20. Sequelae of Radiation in Pregnancy <ul><li>May cause failure of implantation, malformation, growth retardation, CNS abnormalities, or fetal loss. </li></ul><ul><li>Exposure <10 rads (100 mGy) does not  the risk of fetal death, malformation, or developmental delay.* </li></ul><ul><li>Highest risk of radiation damage during embryonic period of organogenesis (weeks 3-9). </li></ul>*International Commission on Radiological Protection.
    21. 21. Childhood Leukemia and Radiation <ul><li>The background rate of leukemia in children is about 3.6 per 10,000. </li></ul><ul><li>Exposure to one or two rad increases this rate to 5 per 10,000. </li></ul>
    22. 22. Use of contrast in pregnancy <ul><li>Iodinated contrast: </li></ul><ul><ul><li>Crosses the placenta </li></ul></ul><ul><ul><li>Can produce transient effects on the developing fetal thyroid gland, although clinical sequelae from brief exposures have not been reported. </li></ul></ul><ul><ul><li>May be used when indicated. </li></ul></ul><ul><li>Gadolinium: </li></ul><ul><ul><li>Crosses the placenta. </li></ul></ul><ul><ul><li>Because of limited experience with this agent, gadolinium is currently not recommended for use in the pregnant patient unless the potential benefit justifies the potential risk to the fetus. </li></ul></ul><ul><ul><li>Animal studies have shown an  risk of spontaneous abortion and skeletal and visceral anomalies. </li></ul></ul>
    23. 23. MRI as an imaging modality <ul><li>Mechanism </li></ul><ul><ul><li>Electromagnetic field induced changes in proton spin </li></ul></ul><ul><li>Theoretical risks to fetus </li></ul><ul><ul><li>Induction of local electric fields and currents </li></ul></ul><ul><ul><li>Radiofrequency radiation results in heating of tissue </li></ul></ul>
    24. 24. American College of Radiology Paper on MRI Safety <ul><li>MRI should only be used in pregnancy when: </li></ul><ul><ul><li>The information requested from the study cannot be obtained from nonionizing means. </li></ul></ul><ul><ul><li>The information is needed to care for the pt and fetus during pregnancy. </li></ul></ul><ul><ul><li>The ordering MD does not feel it is prudent to delay diagnosis until after pregnancy. </li></ul></ul>
    25. 25. MRI in Pregnancy <ul><li>No studies have shown adverse effects on the fetus or the outcome of the pregnancy. </li></ul><ul><li>However, arbitrarily MRI is NOT usually performed in the 1 st trimester 2/2 to this being the period of organogenesis. </li></ul><ul><li>When MRI is used, informed consent must include the possibility that a previously undiagnosed fetal abnormality may be found. </li></ul>
    26. 26. &quot;No single diagnostic procedure results in a radiation dose that threatens the well-being of the developing embryo and fetus.&quot; -- American College of Radiology
    27. 27. Appendicitis #1 Cause of Acute Abdomen
    28. 28. Appendicitis <ul><li>Accounts for 25% of the operative indications for non-obstetric surgery antepartum. </li></ul><ul><li>Appendicitis is NOT more common during pregnancy. </li></ul><ul><li>Incidence is approximately equal in all three trimesters. </li></ul>
    29. 29. Signs and Symptoms <ul><li>RLQ pain: Most reliable sx </li></ul><ul><li>Anorexia and vomiting: Not sensitive nor specific. </li></ul><ul><li>Direct RLQ tenderness: ~100% </li></ul><ul><li>Rebound tenderness: 55-75% of pts </li></ul><ul><li>Abdominal muscle rigidity: 50-65% of pts </li></ul><ul><li>Psoas sign: Observed less frequently. </li></ul><ul><li>All findings are less common in 3 rd trimester due to laxity of abdominal wall muscles. </li></ul>
    30. 30. Adler Sign <ul><li>If the point of maximal tenderness shifts medially with repositioning on the left lateral side, the etiology is generally adnexal or uterine (vs appendiceal). </li></ul>
    31. 31. Appendiceal Location <ul><li>Historically, many references have reported appendiceal displacement. </li></ul><ul><li>In 2003, a study by Hodjati et al showed that pregnancy did NOT change appendiceal location. </li></ul><ul><li>Degree of displacement, if any, is likely due to different extents of cecal fixation. </li></ul>
    32. 32. Laboratory Evaluation <ul><li>WBC: Absolute number not reliable given leukocytosis of pregnancy. </li></ul><ul><li>Differential:  levels of band cells can be reliable indication of infection. </li></ul><ul><li>U/A: Caution as 20% of pts have pyuria or hematuria with appendicitis due to extraluminal irritation of the ureter (rather than due to a UTI). </li></ul>
    33. 33. 1 st Line Imaging for Appendicitis <ul><li>Graded compression U/S </li></ul><ul><ul><li>80% sensitive: non-perforating appendicitis </li></ul></ul><ul><ul><li>28% sensitive: perforated appendicitis </li></ul></ul><ul><ul><li>3 rd trimester accuracy is lower due to technical difficulties. </li></ul></ul>* Doris et al (meta-analysis).
    34. 34. 2 nd Line Imaging for Appendicitis <ul><li>CT </li></ul><ul><li>94% sensitivity </li></ul><ul><li>94% specificity </li></ul><ul><li>MRI </li></ul><ul><li>Up to 100% sensitivity* </li></ul><ul><li>96% specificity* </li></ul><ul><li>No known adverse effects on fetus, but cost and availability may be prohibitive. </li></ul>Fielding and Chin (2006). *Values are from small study of 45 pregnant pts.
    35. 35. Risks for Mother and Fetus <ul><li>66% risk of perforation if surgery delayed by >24 hrs from presentation. </li></ul><ul><li>Negative laparotomy rates of up to 35% are considered acceptable in the pregnant population (vs 15% in non-pregnant population). </li></ul><ul><li>Non-perforated appendix </li></ul><ul><ul><li>Fetal mortality of 1.5% </li></ul></ul><ul><li>Perforated appendix </li></ul><ul><ul><li>Fetal mortality of 20-35% </li></ul></ul><ul><ul><li>Maternal mortality of 1% </li></ul></ul><ul><ul><li>83% risk of preterm contractions due to localized peritonitis. </li></ul></ul><ul><li>In all cases, the rate of premature delivery is highest in the 1 st week post-op. </li></ul>Augustin and Majerovic (2006).
    36. 36. Recommendations for Diffuse Peritonitis <ul><li>IV Cefuroxime, ampicillin, metronidazole, and oxygen pre-operatively. </li></ul><ul><li>Immediate C-section can be considered, depending on gestational age of fetus. </li></ul><ul><li>Preoperative intubation and ventilation in cases of fetal hypoxia. </li></ul>Augustin and Majerovic (2006).
    37. 37. Acute Cholecystitis # 2 Cause of Acute Abdomen
    38. 38. Pathophysiology: Hormones and biliary disease <ul><li> Estrogen in pregnancy   cholesterol synthesis,  hepatic cholesterol uptake,  catabolism of cholesterol to bile acids  Bile supersaturation & cholesterol stones </li></ul><ul><li> Progesterone in pregnancy   bile stasis and  GB contraction in response to CCK </li></ul>
    39. 39. Epidemiology <ul><li>Cholelithiasis is the cause of cholecystitis in pregnant pts in 90% of cases </li></ul><ul><li>Incidence of cholelithiasis in pregnancy is 3.5-10% </li></ul><ul><li>Only 30-40% of pregnant pts with gallstones are symptomatic </li></ul>Augustin and Majerovic (2006).
    40. 40. Presentation and Diagnosis <ul><li>Symptoms: Basically identical in pregnant and non-pregnant pts </li></ul><ul><li>Labs:  Bilirubin, +/-  Transaminases,  Alkaline phosphatase is non-specific as it is  normally in pregnancy </li></ul><ul><li>Imaging: U/S has an accuracy of 95-98% of detecting acute cholecystitis and choledocolithiasis </li></ul>
    41. 41. Initial Management of Cholecystitis <ul><li>IV hydration </li></ul><ul><li>Bowel rest </li></ul><ul><li>Pain control </li></ul><ul><li>Antibiotics </li></ul><ul><li>Fetal monitoring </li></ul><ul><li>Nasogastric decompression if necessary </li></ul>
    42. 42. Surgical Management of Cholecystitis <ul><li>Cholecystectomy is now recommended as the primary treatment for cholecystitis because of: </li></ul><ul><ul><li>Recurrence rate during pregnancy of 44-92%, depending on date of 1 st presentation </li></ul></ul><ul><ul><li>Reduced use of medications </li></ul></ul><ul><ul><li>Shorter hospital stay and fewer hospitalizations </li></ul></ul><ul><ul><li>Elimination of risk of subsequent gallstone pancreatitis </li></ul></ul><ul><ul><li>Minimizing development of potentially life-threatening complications such as perforation, sepsis, and peritonitis </li></ul></ul>Augustin and Majerovic (2006).
    43. 43. Other Indications for Cholecystectomy During pregnancy <ul><li>Choledocolithiasis (after ERCP) </li></ul><ul><li>Gallstone Pancreatitis </li></ul><ul><li>Recurrent symptomatic cholelithiasis </li></ul><ul><ul><li>Several studies have found the incidence of SAb, preterm labor, or premature delivery to be higher in pts treated non-operatively than in those undergoing cholecystectomy. </li></ul></ul><ul><ul><li>However, no prospective trial has been done to determine the best management for recurrent biliary colic. </li></ul></ul>Curet (2000).
    44. 44. Laparotomy vs Laparoscopy?
    45. 45. Choosing Surgical Technique <ul><li>Laparotomy </li></ul><ul><li>Currently considered 1 st line approach. </li></ul><ul><li>Always preferred approach when diffuse peritonitis is present, as it is associated with a lower complication rate than laparoscopy in this setting. </li></ul><ul><li>Laparoscopy </li></ul><ul><li>First offered in 1991 for pregnant patients for appendectomy and cholecystectomy. </li></ul><ul><li>Many new studies show this technique to be safe in pregnancy for routine appendicitis, especially during the 2 nd trimester. </li></ul><ul><li>Can help r/o salpingitis, adnexal mass, or ectopic pregnancy when dx is uncertain. </li></ul>
    46. 46. Recommendations to improve safety of laparoscopy during pregnancy <ul><li>Obstetrical consultation should be obtained preoperatively. </li></ul><ul><li>When possible, operative intervention should be deferred until 2 nd trimester. </li></ul><ul><li>Procedure should be performed with pt in supine, left lateral decubitus position and degree of reverse Trendelenburg should be minimized. </li></ul><ul><li>Open Hasson technique should be used to prevent puncture of uterus. </li></ul><ul><li>Pneumoperitoneum pressures should be minimized to 8-12 mm Hg with maximum 15 mm Hg. </li></ul><ul><li>Administration of tocolytic agents and perioperative monitoring of fetal heart tones should be considered. </li></ul><ul><li>Pneumatic compression devices should always be used as both pneumoperitoneum and the condition of pregnancy are a risk for venous stasis. </li></ul>Halkik et al (2006).
    47. 47. Optimizing Delivery *Understanding what the consulting obstetrician is doing for your patients*
    48. 48. Use of Tocolytics for Preterm Labor <ul><li>Purpose </li></ul><ul><ul><li>Delay delivery so that corticosteroids can be administered. </li></ul></ul><ul><ul><li>Prolong pregnancy when there are underlying, self-limited causes of labor, such as pyelonephritis or abdominal surgery, that are unlikely to cause recurrent PTL. </li></ul></ul><ul><ul><li>Use is limited to <34 weeks gestation </li></ul></ul>
    49. 49. Types of Tocolytics I <ul><li>Terbutaline (Beta-2 agonist) </li></ul><ul><ul><li>Mechanism : Agonist at myometrium causing relaxation </li></ul></ul><ul><ul><li>Meta-analysis showed  # of births within subsequent 48 hrs but no change in # of births within subsequent 7 days </li></ul></ul><ul><li>Magnesium sulfate </li></ul><ul><ul><li>Mechanism : Unknown, likely competes with calcium reducing myometrial contractility </li></ul></ul><ul><ul><li>Cochrane review concluded that this drug did not significantly reduce the proportion of women delivering within 48 hrs. </li></ul></ul>
    50. 50. Types of Tocolytics II <ul><li>Nifedipine (Calcium channel blocker) </li></ul><ul><ul><li>Mechanism : Directly blocks influx of Ca ions </li></ul></ul><ul><ul><li>Meta-analysis showed  # of births within 48 hrs as compared to terbutaline as well as  # of births within subsequent 7 days. </li></ul></ul><ul><li>Indomethacin (Cyclooxygenase inhibitor) </li></ul><ul><ul><li>Mechanism : Blocks production of prostaglandins </li></ul></ul><ul><ul><li>Small studies indicate effectiveness for prolonging time to delivery </li></ul></ul>
    51. 51. Use of corticosteroids to improve fetal outcomes in premature delivery <ul><li>Administration: </li></ul><ul><ul><li>Two doses of 12 mg betamethasone IM given 24 hrs apart. </li></ul></ul><ul><ul><li>Benefit of therapy is initially observed 18 hrs after the first dose with maximal benefit 48 hrs after the first dose. </li></ul></ul><ul><li>Benefits include reduction in the incidence of: </li></ul><ul><ul><li>Neonatal respiratory distress syndrome </li></ul></ul><ul><ul><li>Intraventricular hemorrhage </li></ul></ul><ul><ul><li>Necrotizing enterocolitis </li></ul></ul><ul><ul><li>Mortality </li></ul></ul>
    52. 52. Steroids and peritonitis? <ul><li>“ Glycocorticosteroids administered during the initial phase of experimental diffuse peritonitis display favorable action decreasing animal mortality rate regardless of the dose. However, glycocorticosteroids given in the developed septic syndrome decrease the pro-inflammatory cytokine serum concentration regardless of the dose, still not affecting the animal mortality rate.” </li></ul>Modzelewski et al (2002).
    53. 53. References <ul><li>“ Acute Fatty Liver of Pregnancy.” Up-to-date. </li></ul><ul><li>Augustin, G and M Majerovic. Non-obstetrical acute abdomen during pregnancy . European J of Obstetrics, Gynecology, and Reproductive Biology 2006; 131: 4-12. </li></ul><ul><li>Brooks et al. The Pregnant Surgical Patient . ACS Surgery: Principles and Practice. </li></ul><ul><li>Curet, MJ. Special problems in laparascopic surgery: previous abdominal surgery, obesity, and pregnancy. Surg Clinic North Am 2000; 80: 1093-1110. </li></ul><ul><li>“ Ectopic Pregnancy.” Up-to-date. </li></ul><ul><li>Fielding, JR and BM Chin. Magnetic Resonance Imaging of Abdominal Pain during Pregnancy . Top Magn Resonance Imaging 2006; 17: 409-416. </li></ul><ul><li>Halkic et al. Laparascopic management of appendicitis and symptomatic cholelithiasis during pregnancy. Langenbacks Arch Surg 2006; 391: 467-471. </li></ul><ul><li>“ HELLP Syndrome.” Up-to-date. </li></ul><ul><li>“ Inhibition of preterm labor.” Up-to-date. </li></ul><ul><li>Kahaleh et al. Safety and efficacy of ERCP in pregnancy. Gastrointestinal Endoscopy 2004; 60: 287-292. </li></ul><ul><li>Modzelewski et al. Tests for the usefulness of glucocorticosteroids in treatment of experimental peritonitis . Pol Merkur Lekarski 2002; 69: 228-231. </li></ul><ul><li>Murray et al. Diagnosis and treatment of ectopic pregnancy . CMAJ 2005; 73: 905. </li></ul><ul><li>Pedrosa et al. MR Imaging of Acute Right Lower Quadrant Pain in Pregnant and Nonpregnant Patients. Radiographics 2007; 27: 721-753. </li></ul>