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Slide 1 - Acute Abdominal Pain Chap. 72 Presented by Dr. Current Chrisnel Jean, D.O Tuesday October 11, 2005
Slide 2 - Outline – Acute Abdominal Pain Definition Epidemiology Pathophysiology Visceral Referred History / Physical Exam of Abdominal Pain Labs / Radiographic Test for Abd Pain
Slide 3 - Outline – Acute Abdominal Pain Intra-abdominal Diagnosis by Organ System : Gastrointestinal Gynecologic Pain Appendicitis Acute PID Biliary Tract Disease Ectopic Preg Small Ball Obstruction Diverticulitis Vascular Acute Pancreatitis AAA Genitourinary Mesenteric Ischemia Renal Colic Ischemic Colitis Acute Urinary Retention / UTI Treatment Disposition
Slide 4 - Acute Abdominal Pain Define as: pain less than one week duration. The principal reason for an ED visit in 2000. Annual incidence approx. 63/1000 ED visits Admission rate varies (high as 63% in pts > 65 yrs old.)
Slide 5 - Types of Abdominal Pain: Three types of pain exist: 1. Visceral 2. Parietal 3. Referred
Slide 6 - 1. Visceral Pain Due to stretching of fibers innervating the walls of hollow or solid organs. It occurs early and poorly localized It can be due to early ischemia or inflammation.
Slide 7 - 2. Parietal Pain Caused by irritation of parietal peritoneum fibers. It occurs late and better localized. Can be localized to a dermatome superficial to site of the painful stimulus.
Slide 8 - 3. Referred Pain Pain is felt at a site away from the pathological organ. Pain is usually ipsilateral to the involved organ and is felt midline if pathology is midline. Pattern based on developmental embryology.
Slide 9 - Acute Abdominal Pain Two approaches to evaluate pts with acute abdominal pain: 1. Classification of abd pain into systems 2. Abdominal Topography (4 quadrants)
Slide 10 - Classification on Abdominal Pain Three main categories of abdominal pain: 1. Intra-abdominal (arising from within the abd cavity / retroperitoneum) involves: GI (Appendicitis, Diverticulitis, etc, etc, etc) GU (Renal Colic, etc, etc, etc) Gyn (Acute PID, Pregnancy, etc) Vascular systems (AAA, Mesenteric Ischemia, etc)
Slide 11 - Classification on Abdominal Pain 2. Extra-abdominal (less common) involves: Cardiopulmonary (AMI, etc) Abdominal wall (Hernia, Zoster etc) Toxic-metabolic (DKA, OD, lead, etc) Neurogenic pain (Zoster, etc) Psychic (Anxiety, Depression, etc) 3. Nonspecific Abd pain – not well explained or described.
Slide 13 - Historical features of Abd Pain Location, quality, severity, onset, and duration of pain, aggravating and alleviating factors GI symptoms (N/V/D) GU symptoms Vascular symptoms (A. fib / AMI / AAA) Can overlap i.e. Nausea seen in both GI / GU pathologies.
Slide 14 - Historical features of Abd Pain PMH Recent / current medications Past hospitalizations Past surgery Chronic disease Social history Occupation / Toxic exposure (CO / lead)
Slide 15 - Physical Examination of the Abdomen Note pt’s general appearance. Realize that the intensity of the abdominal pain may have no relationship to severity of illness. One of the initial steps of the PE should be obtaining and interpreting the vitals. Pts with visceral pain are unable to lie still. Pts with peritonitis like to stay immobile.
Slide 16 - Physical Examination of the Abdomen INSPECT for distention, scars, masses, rash. AUSCULATE for hyperactive, obstructive, absent, or normal bowel sounds. PALPATION to look for guarding, rigidity, rebound tenderness, organomegally, or hernias. Women should have pelvic exam (check FHR if pregnant). Anyone with a rectum should have rectal exam (If no rectum check the ostomy).
Slide 17 - Laboratory Test CBC (limited clinical utility) BMP / CMP UA / Urine culture Lactic acid LFT / Amylase / Lipase CE / Troponin HCG (quant / qual) Stool Culture
Slide 18 - Radiographic Test Plain abdominal radiographs or abdominal series has several limitations and is subject to reader interpretation. CT scan in conjunction with ultrasound is superior in identifying any abnormality seen on plain film.
Slide 19 - Specific Diagnoses In patients above fifty years of age the top four reasons for acute abdominal pain are: Biliary Tract Disease (21%,) NSAP (16%), Appendicitis(15%), and Bowel Obstruction (12%). In patients under fifty years of age the top three reasons for acute abdominal pain are: NSAP (40%,) Appendicitis (32%,) and Other (13%.)
Slide 20 - Acute Appendicitis “In spite of a large number of algorithms and decision rules incorporating many different clinical and laboratory features, an accurate preoperative diagnosis of appendicitis has remain elusive for more than a century.”
Slide 21 - Acute Appendicitis Clinical features with some predictive value include: Pain located in the RLQ Pain migration from the periumbilical area to the RLQ Rigidity Pain before vomiting Positive psoas sign Note: Anorexia is not a useful symptom (33% pts not anorectic preoperatively.)
Slide 22 - Acute Appendicitis Ultrasound can be used for detection, but CT is preferred in adults and non-pregnant women. The CT scan can be with and without contrast (oral & IV.) A neg. CT does not exclude diagnosis, but a positive scan confirms it.
Slide 23 - Biliary Tract Disease Most common diagnosis in ED of pts > 50. Composed of: Acute Cholecystitis (acalculus / calculus) Biliary Colic Common Duct Obstruction (Ascending Cholangitis – painful jundice / fever / MSΔ). Of those patients found to have acute cholecystitis, the majority lack fever and 40% lack leukocytosis.
Slide 24 - Biliary Tract Disease Patients may complain of: Diffuse pain in upper half of abdomen Generalized tenderness throughout belly RUQ or RLQ pain.
Slide 25 - Biliary Tract Disease Sonography (US) is the initial test of choice for patients with suspected biliary tract disease. More sensitive than CT scan to detect CBD obstruction. CT scan is better in the identification of cholecystitis than in the detection of CBD obstruction. Cholescintigraphy (radionclide / HIDA scan) of the biliary tree is a more sensitive test than US for the diagnosis of both of these conditions.
Slide 26 - Biliary Tract Disease MR cholangiography (MRCP) Has good specificity and sensitivity in picking up stones and common duct obstructions. Less invasive / less complications than ERCP (ERCP can induce GI perforation, pancreatitis, biliary duct injury)
Slide 27 - Small Bowel Obstruction SBO may result from previous abdominal surgeries. Patient may present with intermittent, colicky pain, abdominal distention, and abnormal BS. Only 2 historical features (previous abd surgery and intermittent / colicky pain) and 2 physical findings (abd distention and abn BS) appear to have predictive value in diagnosing SBO.
Slide 28 - Small Bowel Obstruction Plain abd films has a large number of indeterminate readings and can be very limited due to the following: Pt is obese Pt is bedridden / contracted (limited lateral decub / upright view) Technical limitations
Slide 29 - Small Bowel Obstruction CT scan is better than plain film in detecting high grade SBO. CT scan can also give more info that might not be seen on plain film (i.e. ischemic bowel) Low grade SBO may require small bowel follow through.
Slide 30 - Acute Pancreatitis 80% of cases are due to ETOH abuse or gallstones. Other common causes: Drugs ( Valproic acid, Tetracycline, Hydrochlorothiazide, Furosemide) Pancreatic cancer Abdominal trauma/surgery Ulcer with pancreatic involvement Familial pancreatitis (Hypertriglycerides / Hypercalcemia) Iatrogenic (ERCP) In Trinidad, the sting of the scorpion Tityus trinitatis is the most common cause of acute pancreatitis Definition : Inflammation of the pancreas Associated with edema, pancreatic autodigestion, necrosis and possible hemorrhage
Slide 31 - Acute Pancreatitis Only a minority number of pts present with pain and tenderness limited to the anatomic area of the pancrease in the upper half of the abdomen. 50% of pts present with c/o pain extending well beyond the upper abd to cause generalized tenderness.
Slide 32 - Acute Pancreatitis The inflammatory process around the pancreas may cause other signs and symptoms such as: Pleural effusion Grey Turner's sign ( flank discoloration ) Cullen's sign ( discoloration around the umbilicus ) Ascites Jaundice
Slide 33 - Acute Pancreatitis Lipase testing is preferred in ED. Other test to consider: (CBC, CMP, Amylase, UA and CE/trop) The height of the pancreatic enzyme elevations do not have prognostic value A double contrast helical CT scan stages severity and predicts mortality sooner than Ranson’s Criteria.
Slide 34 - Acute Pancreatitis Should consider ICU admission for pts with high Ranson’s Criteria. When making the diagnosis of Acute Pancreatitis, it maybe necessary to assess the pt for the following: Biliary pancreatitis Peripancreatic complications
Slide 35 - Acute Pancreatitis Biliary pancreatitis -Due to CBD obstruction. -Can lead to Ascending Cholangitis Clinical findings: May have a fever, MSΔ, jaundice / icterus Lab findings: ↑AST / ALT, ↑Total Bilirubin Radiological std: MRCP - Test of choice to get clear images of the pancrease and CBD. Double contrast CT - can also be use, may have limited view of the CBD – 2nd most common test to be ordered in ED Ultrasound – 1st most common test to be order in ED to evaluate for CBD obstruction. More sensitive than CT scan to evaluate the CBD. Its use is safer in pregnancy.
Slide 36 - Acute Pancreatitis Peripancreatic complications: Necrosis (Necrotizing Pancreatitis) Hemorrhage (Hemorrhagic Pancreatitis) Drainable fluid collections (Ruptured Pancreatic Pseudocyst) Clinical findings: May have a distended Abd, appear septic, Cullen’s sign, and / or Grey Turner’s Sign. Lab findings: No definite lab test will help in the diagnosis. May see decrease Hg or ↑Lactic Acid level. Radiological test: of choice to evaluate for the above complications is a double contrast CT scan.
Slide 37 - Acute Diverticulitis Less than ¼ of pts present with LLQ pain. 1/3 of pts present with pain to the lower half of the abdomen. 20% of elderly pts with operatively confirmed diverticulitis lacked abdominal tenderness. Elderly pts are at risk for a severe and often fatal complication of diverticulitis. (Free perforation of the colon)
Slide 38 - Acute Diverticulitis CT with contrast: Test of choice for Acute Diverticulitis. Can identify abscesses, other complications, and inform surgical management strategies. US: Relies on identification of an inflamed diverticulum to make the diagnosis which is often obscured in pts with complicated diverticulitis.
Slide 39 - Renal Colic Pts may present with abrupt, colicky, unilateral flank pain that radiates to the groin, testicle, or labia. Hematuria and plain abd films can be helpful however do not provide a strong support in the diagnostic evaluation of suspected renal colic. Noncontrast helical CT is standard for the diagnosis. IVP has poor sensitivity and time consuming in ED setting. Must rule out AAA.
Slide 40 - Acute Pelvic Inflammatory Disease Patient may complain of pain / tenderness in lower abdomen, adnexal or cervix. Most importantly patient may complain of abnormal vaginal discharge (most common finding). Fever, palpable mass, ↑WBC have been inconsistently associated with PID. The best noninvasive test is transvaginal ultrasound.
Slide 41 - Ectopic Pregnancy Symptoms include abdominal pain (most common) and vaginal bleeding (maybe the only complaint). Female pts (child bearing age) that present with these symptoms automatically get a pregnancy test and HCG quantitative level.
Slide 42 - Ectopic Pregnancy If the pt is pregnant, then order a transvaginal US to evaluate for ectopic pregnancy. Clear view of an IUP in 2 perpendicular views essentially excludes an ectopic pregnancy. If an IUP is not seen, this must be interpreted in the context of the discriminatory zone (DZ) of the quantitative HCG.
Slide 43 - Ectopic Pregnancy The DZ (1500 mlU/ml) is the threshold level of serum HCG, above which a normal IUP should be seen on sonography. Although there is a broad range of normal variation in HCG, failure of levels to increase by about 66% within 48 h in 1st trim pregnancy suggests an abnormal gestation (either a threatened miscarriage or blighted pregnancy from an ectopic.) If the diagnosis is not made with US and there is still a high suspicion for ectopic than laparoscopy is indicated.
Slide 44 - Abdominal Aortic Aneurysm Dissections produce chest or upper back pain that can migrates to abdomen as the dissection extend distally. AAA rather than dissect, it enlarge, leak, and rupture. <50% of pts with AAA present with hypotension, abdominal/back pain, and/or pulsatile abd mass. Can present similar to renal colic. Neither the presence or the absence of femoral pulse or an abdominal bruit are helpful clinically.
Slide 45 - Abdominal Aortic Aneurysm Palpation is an important part of physical exam. Maybe able to detect an enlarged aorta. Any stable pt > 50 yrs old presenting with recent onset of abd / flank / low back pain should have a CT scan to exclude AAA from the differential diagnosis. Can use bedside ultrasound FAST scan, but this will not provide information about leakage or rupture. MRI is limited in its ability to identify fresh bleeding. It is not an appropriate emergency procedure.
Slide 46 - Mesenteric Ischemia (MI) Diagnosis can be divided into the following: 1. Arterial insufficiency Occlusive – Embolic (A. Fib) / Thrombotic Embolic MI has the most abrupt onset. Nonocclusive – Low flow state (AMI / Shock) Usually has clinical evidence of a low flow state ( acute cardiac disease)
Slide 47 - Mesenteric Ischemia (MI) 2. Venous – Mesenteric Venous Thrombosis Occurs in hypercoagulable states. Usually is found in younger pts. Has a lower mortality. Can be treated with immediate anticoagulation.
Slide 48 - Mesenteric Ischemia Pt is usually older, has significant co-morbidity, and with visceral type abdominal pain poorly localized without tenderness. Pt may have a diversion for food or weight loss. Elevated Lactate level may help in the diagnosis. Abd films may have findings of perforated viscus and / or obstruction. May find pneumotosis intestinalis, free fluid, dilated bowel consistent with an ileus and / or obstructive pattern on CT scan. Angiography is the diagnostic and initial therapeutic procedure of choice.
Slide 49 - Ischemic Colitis It is a diagnosis of an older patient. Pain described as diffuse, lower abdominal pain in 80% of pts. Can be accompanied by diarrhea often mixed with blood in 60% of patients. Compares to mesenteric ischemia, this is not due to large vessel occlusive disease. Angiography is not indicated. If it is performed it is often normal.
Slide 50 - Ischemic Colitis Can be seen post – Abd Aorta surgery The diagnosis is made by colonoscopy. A color doppler ultrasound can also be used. In most cases only segmental areas of the mucosa and submucosa are affected. Chronic cases can lead to colonic stricture. Treatment may include conservative management or if bowel necrosis occurs surgery may be needed for colectomy.
Slide 51 - Extrabdominal Diagnoses of Acute Abdominal Pain: Cardiopulmonary Pain is usually in upper half of abdomen. A chest film should be done to look for pneumonia, pulmonary infarction, pleura effusion, and / or pnemothorax. A neg. film plus pleuritic pain could mean PE. If epigastric pain is present one should inquire about cardiac history, get and ECG, and consider further cardiac evaluation .
Slide 52 - Extrabdominal Diagnoses of Acute Abdominal Pain: Abdominal Wall Carnett’s sign: The examiner finds point of maximum abdominal tenderness on patient. Patient asked to sit up half way, and if palpation produces same or increased tenderness than test is positive for an abdominal wall syndrome. Abd wall syndrome overlaps with hernia, neuropathic causes of acute abdominal pain
Slide 53 - Extrabdominal Diagnoses of Acute Abdominal Pain: Hernias Characterized by a defect through which intraabdominal contents protrude during increases in the intraabdominal pressure Several types exist: inguinal, incisional, periumbilical, and femoral (common in Female). Uncomplicated hernias can be asymptomatic, aching / uncomfortable, and reducible on exam. Significant pain could mean strangulation (blood supply is compromised) / incarceration (not reducible).
Slide 54 - Toxic causes for Acute Abdominal Pain Pt may present with symptoms of N/V/D and/or +/- fever to suggest a gastroenteritis or enterocolitis. Most of these infections are confine to the mucosa of the GI tract, therefore, pts may not present with significant tenderness. Other Infectious etiology that can cause abd pain includes: Gp A Beta Hem. Strep Pharyngitis, Henoch-Schonlein purpura, Rocky Mountain spotted fever, Scarlet fever, early toxic shock syndrome.
Slide 55 - Other Toxic causes for Acute Abdominal Pain Other toxic cause includes poisoning and OD Black Widow Spider  Abd muscle spasm Cocaine induced intestinal ischemia Iron poisoning Lead toxicity Mercury salts Electrical injury Opoid withdrawal Mushroom toxicity Isopropranol induced hemorrhagic gastritis
Slide 56 - Metabolic causes for Acute Abdominal Pain DKA AKA (ETOH) Note both AKA / DKA can be a cause or a consequence of acute pancreatitis. Adrenal crisis Thyroid storm Hypo / hypercalcemia Sickle cell crisis – consider these causes for pain splenomegaly / heptomegaly, splenic infarct, cholecystitis, pancreatitis, Salmonella infect, or mesenteric venous thrombosis.
Slide 57 - Neurogenic causes for Acute Abdominal Pain “Hover Sign” – the pt show signs of discomfort when the examining hand is hovering just above or is passed very lightly over the area of dysesthesia. Zosteriform Radiculopathy- follows dermatome distribution and is characterized by shooting or continuous burning sensation. May be due to diabetic neuropathic involvement of root, plexus, or nerve.
Slide 58 - NSAP causes for Acute Abdominal Pain A good portion of ER patients will have nonspecific abdominal pain. Patients may have nausea, midepigastric pain, or RLQ tenderness. The lab workup is usually normal. WBC may be elevated. Diagnosis should be confirm with repeated exam.
Slide 59 - Special Considerations In pts >50 you must consider mesenteric ischemia, ischemic colitis, and AAA. In an elderly patient symptoms do not manifest in the same manner as those younger. Compared to young pts, only 20% of elderly pts with abdominal pain will be diagnose with NSAP Assume an elderly patient has a surgical cause of pain unless proven otherwise. 40% of those > 65 yrs old that present to ED with abdominal pain need surgery.
Slide 60 - HIV/AIDS Enterocolitis with diarrhea and dehydration is most common cause of abdominal pain. CMV related large bowel perforation is possible. Watch for obstruction due to Kaposi Sarcoma, lymphoma, or atypical mycobacteria. Watch for biliary tract disease (CMV, Cryptosporidium.)
Slide 61 - Treatment of Acute Abdominal Pain Hypotension: In younger pts probably due to volume depletion from vomiting, diarrhea, decreased oral intake or third spacing. Treatment would be isotonic crystalloid. Younger patients may also have abdominal sepsis (septic shock). Treatment would include isotonic crystalloid, antibiotics, and vasopressors (levophed or dopamine).
Slide 62 - Treatment of Acute Abdominal Pain Hypotension: In older patients CV disease should be added to the differential. If AMI is the diagnosis, a aortic balloon pump may be needed until angioplasty or bypass is done. If CHF is diagnosed than dobutamine with isotonic crystalloid may be used Must also consider hemorrhage as a cause: Initiate treatment with isotonic crystalloid then consider blood transfusion
Slide 63 - Treatment of Acute Abdominal Pain Analgesics: Though in past ER physicians did not treat acute abdominal pain with analgesics for fear of altering or obscuring the diagnosis, current literature favors the use of opoids judiciously in such patients.
Slide 64 - Treatment of Acute Abdominal Pain Antibiotics: Must be consider when treating suspected abdominal sepsis or diffuse peritonitis. Coverage should be aimed at anaerobes and aerobic gram negatives. If SBP suspected, must cover for gram positive aerobes. Examples of mononotherapy are cefoxitin, cefotetan, ampicillin-sulbactam, or ticarcillin-clavulanate.
Slide 65 - Disposition of Acute Abdominal Pain Indications for admissions: Pts who appear ill. Very young / Elderly Immunocompromised Unclear diagnosis Intractable pain, nausea, or vomiting Altered mental status Those using drugs, alcohol, or that lack social support. Pts with poor follow-up and/or noncompliant.
Slide 66 - Disposition of Acute Abdominal Pain Non-specific abdominal pain If this is the working diagnosis, patients must be re-examined in 24 hours. This may be done in the outpatient setting.
Slide 67 - ??? QUESTION #1 ??? A 45 year-old male patient presents with severe abdominal pain which is worse with movement. He has fever, tachycardia, tachypnea and a narrow pulse pressure. There is guarding, and rebound tenderness in the right lower quadrant. Which of the following is the most likely diagnosis? Perforated appendicitis Acute unperforated appendicitis Perforated gallbladder Ruptured diverticulum Acute cholecystitis
Slide 68 - ??? QUESTION #2 ??? A 45 year-old male with peptic ulcer disease (PUD) presents to the ED with an abrupt onset of severe epigastric pain 1 hour prior to arrival. Abd exam leads you to suspect an early acute surgical abdomen. Describe the findings and treatment with this complication of PUD. Physical examination findings suggestive of perforation include all of the following except? A reactive pleural effusion is frequent seen with gastric perforation. Tympany may indicate free air, confirmed by upright chest x-ray or lateral decubitus film Acute pancreatitis may result from posterior perforation. Chemical peritonitis progresses to abdominal rigidity, bacterial peritonitis and sepsis.
Slide 69 - ??? QUESTION #3 ??? Acute pancreatitis may range from mild inflammation to severe hemorrhagic pancreatitis with extensive necrosis of the gland. Serum amylase and lipase are elevated. Laboratory findings suggesting a poor prognosis include all of the following except: Elevated blood glucose Elevated hematocrit (due to dehydration) Elevated LDH Elevated WBC Elevated AST
Slide 70 - ??? QUESTION #4 ??? Most hernias are asymptomatic, but signs and symptoms may include all of the following except: Chronic postprandial pain and belching. Nausea and vomiting with pain, inflammation and toxicity, progressing to perforation, peritonitis and sepsis with strangulated hernias. Abdominal or focal pain and tenderness, possibly with signs of obstruction with incarceration. Possibly tachycardia and fever, leukocytosis and left shift. Local swelling; intermittent "dragging" sensation or minor aching discomfort.
Slide 71 - ??? QUESTION #5 ??? All of the following are true regarding the plain radiographic evaluation of bowel obstruction except: A stepladder pattern of air-fluid levels suggests obstruction. Gas in the rectum or sigmoid excludes obstruction. A dilated loop may terminate abruptly at the site of obstruction. Obtain an upright chest x-ray to exclude free air in the abdomen. Obtain flat and upright abdominal films or decubitus films to look for air fluid levels. Dilated loops without stepladder air-fluid levels may be due to ileus.
Slide 72 - ANSWERS A -These findings are highly suggestive of bacterial peritonitis and sepsis. A B A A -With complete obstruction, distal gas will usually be absent. Gas may still be present early in obstruction, however, or may be introduced during the rectal examination.