2. • Abdo pain is more complex in pregnant
women as uterine enlargement may hide
classical signs
3. Cause of pain
• Obstetric
• Gynaecological
• “Surgical”
• “Medical”
• Musculoskeletal
• Mainly going to focus on obs and gynae
pain
4. Obstetric causes 1
• Labour pain - premature labour or term.
• Pre-eclampsia or HELLP syndrome
– (Haemolysis, Elevated Liver Enzymes, Low plts)
– epigastric or right upper quadrant pain.
– This may be confused with heart burn
• Placental abruption:
– Separation of placenta from uterus wall before delivery
– Typically, sudden severe pain and a 'woody' hard, tender uterus;
fetal distress, ± vaginal bleeding.
– With posterior placenta, pain and shock may be less severe,
with pain felt in the back
– diagnose by pattern of fetal contractions (excessive and
frequent) with fetal heart pattern suggesting hypoxia.
5. Obstetric causes 2
• Uterine rupture:
– Integrity of myometrial wall is breached
– Constant pain, profound shock, fetal distress and vaginal
bleeding; usually presents during labour and with history of
uterine scar (eg c-section).
– Rarely, occurs without labour and without uterine scar.
• Chorioamnionitis:
– Infalammation of fetal membranes due to bact. infection
– This usually follows premature rupture of membranes, but can
occur with membranes intact.
• Acute fatty liver of pregnancy:
– Presents in the second half of pregnancy with abdominal pain,
nausea/vomiting, jaundice, malaise and headache.
6. Obstetric causes 3
• Acute polyhydramnios
– Excess amniotic fluid collects rapidly
• Severe uterine torsion - rare; may be due
to structural abnormalities in the pelvis.
– Presents in the second half of pregnancy with
variable symptoms, including severe
abdominal pain, tense uterus, retention of
urine ± shock and fetal distress; or, it may be
asymptomatic
– the fetus is at risk.
7.
8. Gynaecological causes 1
• Ectopic pregnancy
– Usually presents between 5-9 weeks' gestation.
– Classical triad of bleeding, abdominal pain, and
amenorrhoea is not present in many women;
symptoms and signs are often nonspecific; the
diagnosis can only be confirmed in secondary care.
– Symptoms vary + include:
• syncope
• dysuria (including dipstick urine findings suggesting UTI)
• diarrhoea and vomiting
• subtle changes in vital signs
• adnexal tenderness may be absent
• a history of 'missed period' may be absent if vaginal bleeding
is mistaken for a normal period.
9. Gynaecological causes 2
• Miscarriage ± septic abortion.
• Torsion of the ovary or Fallopian tube.
– Sharp, unilateral lower abdo pain
• Ovarian cysts - torsion, haemorrhage or rupture.
• Fibroids - red degeneration or torsion.
– Hormones during pregnancy cause fibroids to grow
– They outgrow their blood supply
lack of nutrients break down and cause pain
– Can also cause miscarriage/early labour
10. Gynaecological causes 3
• Ovarian hyperstimulation syndrome:
– A complication of gonadotrophin-assisted
conception; can occur pre-conception or in
early pregnancy.
– Large ovarian cysts cause abdominal pain
and distention and, in severe cases, also fluid
shifts, ascites, pleural effusion and shock.
• Salpingitis
• Round ligament pain.
11.
12. “Surgical” Causes
• Acute appendicitis.
– Presents with fever, anorexia, nausea, vomiting, right iliac fossa (RIF) pain.
– After the first trimester, the pain may shift upwards towards the right upper quadrant, but does not always
do so - and patients in all trimesters may have RIF pain.
– With retrocaecal appendix, may have back or flank pain.
• Cholecystitis and gallstones.
• Urinary tract - renal calculi, urinary tract obstruction (including acute urinary retention due to
retroverted gravid uterus).
• Intestinal obstruction - most often due to adhesions.
• Peritonitis from any cause.
• Abdominal trauma, including domestic violence.
• Mesenteric adenitis.
• Meckel's diverticulitis.
• Peptic ulcer.
• Inflammatory bowel disease.
• Abdominal wall - hernias, musculoskeletal pain, rupture of rectus abdominis muscle.
• Acute pancreatitis - rare and usually due to gallstones.
• Mesenteric venous thrombosis (rare) - most reported cases have occurred where dehydration
complicated an underlying hypercoagulable state.[2]
• Rupture of visceral artery aneurysm (rare).
13. “Medical” Problems
• UTI ± pyelonephritis.
• Constipation.
• Diabetic ketoacidosis.
• Sickle-cell anaemia crisis.
• Lower lobe pneumonia.
• Venous thromboembolism - deep vein thrombosis or
pulmonary embolus may cause lower or upper
abdominal pain respectively.
• Myocardial infarction.
• Gastroenteritis.
• Irritable bowel syndrome.
14. Musculoskeletal Causes
• Round ligament pain - low abdominal or groin
pain due to the uterus pulling on the round
ligament.
• General aches - due to uterine enlargement.
• Rectus muscle haematoma - due to rupture of
inferior epigastric vessels in late pregnancy:
– Presents with sudden severe abdominal pain, often
after coughing or trauma.
• Pelvic girdle pain:
– Symphysis pubis dehiscence.
– Osteomalacia may present in pregnancy due to
increasing vitamin D requirements.
15.
16. History
• Pain history – SOCRATES
• Other abdominal symptoms - vaginal bleeding, bowel and urinary
symptoms; pre-eclampsia symptoms (eg headache, visual change,
nausea).
• Fetal movements.
• Obstetric history –
– last menstrual period (LMP)
– confirm whether the patient's last bleed was 'normal' for the patient
(ectopic pregnancy may have some bleeding which can be mistaken for
menstrual bleed)
– ask if there has been any difficult or assisted conception
– confirm use of any contraception (coil and progestogen-only pill (POP)
increase ectopic risk).
• Past medical and gynaecological history, medication, allergies, last
meal.
17. Examination
• General examination –
– well/ill, signs of sepsis, shock or haemorrhage, blood pressure, urine
dipstick protein and glucose.
• Assess the pregnancy and uterus:
– Palpate uterus for fundal height, contractions or hard uterus,
polyhydramnios, fetal position and presentation.
– Assess fetal wellbeing - movements or heartbeat (auscultate, Doppler
scan or CTG).
• Abdominal examination –
– distinguish extra-uterine from uterine tenderness,
– Peritoneal signs may be absent in pregnancy
– Note the changing positions of the intra-abdominal contents as the
pregnancy progresses.
• Consider whether vaginal and/or rectal examination is indicated:
– Never do vaginal examination if placenta praevia is suspected
– Suspected rupture of membranes requires sterile examination and
should be done in an obstetric unit.
18. Investigations
• Urine (dip stick and pregnancy if indicated)
• CTG
• Bloods (FBC, group and save, serum b-
HCG,)
• Ultrasound
Abdominal examination –
distinguish extra-uterine from uterine tenderness, lie the patient on her side, thus displacing the uterus.
Peritoneal signs may be absent in pregnancy, as the uterus can lift the abdominal wall away from the area of inflammation.
Note the changing positions of the intra-abdominal contents as the pregnancy progresses. The appendix is located at McBurney's point in patients in the first trimester, but then moves upward and laterally towards the gallbladder. The bowel can be displaced into the upper abdomen.
Consider whether vaginal and/or rectal examination is indicated:
Never do vaginal examination if placenta praevia is suspected
Suspected rupture of membranes requires sterile examination and should be done in an obstetric unit.
For incomplete miscarriage with heavy bleeding, examine the cervical os. Products in the os may cause heavy bleeding, and also bradycardia/shock due to vagal stimulation. Remove products in the os (using sponge forceps) to reduce bleeding and pain.