Diseases information. Disorders. Treatment.

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Plain abdominal films

“Four views of the abdomen” (acute abdomen series) includes a upright PA chest, plain abdominal film (”flat plate”), upright film, and a left lateral decubitus view of the abdomen.

Bowel obstruction

Small bowel obstruction may cause multiple air-fluid levels with dilated loops of small intestine but colonic gas.

Colonic obstruction causes colonic dilation which can be distinguished from small intestine by the presence of haustral markings and absence of valvulae conniventes.

Free air is seen on the upright chest x-ray under the hemidiaphragms. Intestinal perforation is the most common cause of free air. A recent laparotomy may also cause free air.

Stones and calcifications. Ninety percent of urinary stones are radiopaque. Only 15% of gallstones are visible on plain film. A fecalith in the right lower quadrant may suggest appendicitis. Vascular calcification may be visible in abdominal aneurysm.
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Ultrasonography is useful for evaluation of biliary colic, cholecystitis, pancreatitis, or female reproductive system disorders.

Nuclear medicine studies. Radioisotopic biliary scans (HIDA, DISIDA, PIPIDA) evaluate filling and emptying of the gallbladder and the extrahepatic biliary tree. Gallbladder filling excludes acute cholecystitis. Non-filling is suggestive of cholecystitis

Rectal and pelvic examination

Digital examination of the rectum may detect cancer, fecal impaction, or pelvic appendicitis. Stool should be checked for gross or occult blood.

Pelvic examination. Vaginal discharge should be noted and cultured. Masses and tenderness should be sought bimanually. Adnexal or cervical motion tenderness indicate pelvic inflammatory disease.

Laboratory evaluation

Leukocytosis or a left shift on differential cell count are non-specific findings for infection. Leukopenia may be present in sepsis. The hematocrit can detect anemia due to occult blood loss from cancer. The hematocrit may be elevated with plasma volume deficits.

Electrolytes. Hypochloremic metabolic acidosis occurs with severe hypovolemia or sepsis.

Urinalysis. Bacteriuria, pyuria, or positive leukocyte esterase suggest urinary tract infection. Hematuria suggests urolithiasis.

Liver function tests. High transaminases with mild to moderate elevations of alkaline phosphatase and bilirubin suggests acute hepatitis. High alkaline phosphatase and bilirubin and mild elevations of transaminases suggests biliary obstruction.

Pancreatic enzymes. Elevated amylase and lipase indicates acute pancreatitis. Hyperamylasemia also may occur in bowel infarction and perforated ulcer.

Serum beta-human chorionic gonadotropin is required in women of childbearing age with abdominal pain to exclude ectopic gestation.

Nonsteroidal anti-inflammatory drugs predispose to peptic ulcer disease.

Antibiotic therapy may obscure the signs of peritonitis. Patients with abdominal pain and diarrhea who have received antibiotics may have pseudomembranous colitis.
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Anticoagulants. Warfarin therapy predisposes to retroperitoneal or intramural intestinal hemorrhage and can cause bowel obstruction.

Thiazide diuretics may rarely cause of pancreatitis.
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Surgical history. Small bowel obstruction is often caused by postoperative adhesions.

General appearance. Peritonitis is suggested by shallow, rapid breathing and the patient often will lie still with knees flexed to minimize peritoneal stimulation. Patients may be pale or diaphoretic. Cachexia may indicate malignancy or chronic illness.

Fever suggests an inflammatory or infectious etiology. Tachycardia and tachypnea may be caused by pain, hypovolemia, or sepsis. Hypothermia and hypotension often suggest a serious infectious process. Pneumonia and myocardial infarction may occasionally cause pain that is felt in the abdomen.

Abdominal examination

Inspection. Surgical scars should be sought. Distention suggests obstruction, ileus, or ascites. Venous engorgement of the abdominal wall suggests portal hypertension. Masses or peristaltic waves may be visible. Hemoperitoneum may cause bluish discoloration of the umbilicus (Cullen’s sign). Retroperitoneal bleeding (eg, from hemorrhagic pancreatitis) can cause flank ecchymoses (Turner’s sign).
Auscultation. Borborygmi may be heard with obstruction. A quiet, tender abdomen may occur with generalized peritonitis. Bruits suggests an aortic aneurysm.
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Palpation

With the patient supine and knees flexed, palpation should be gently started at a point remote from the pain. Muscle spasm, tympany or dullness, masses and hernias should be sought.
Peritoneal signs. Rigidity is caused by reflex spasm of the abdominal wall musculature from underlying inflamed parietal peritoneum. Stretch and release of inflamed parietal peritoneum causes rebound tenderness.
Common signs
Murphy’s sign. Inspiratory arrest from palpation in the right upper quadrant occurs when an inflamed gallbladder descends to meet the examiner’s fingers.
Obturator sign. Suprapubic tenderness on internal rotation of the hip joint with the knee and hip flexed results from inflammation adjacent to the obturator internus muscle.
Iliopsoas sign. Extension of the hip elicits tenderness if the iliopsoas muscle is involved by inflammatory disorders in the retroperitoneum.
Rovsing’s sign. Deep palpation in the left lower quadrant causing pain on the right is indicative of appendicitis.