cholelithiasis

Department of Surgery. College of Medicine. Tikrit University. By Assisst.Prof. Dr.Makki.K.Allaw

Learning Objectives

To understand: The pathophysiology of gall stones. Clinical presentation of gall stones. The techniques used for imaging the biliary tree. The management of gall stones.

Background

Presence of gallstones in the gallbladder. Spectrum ranges from asymptomatic, colic, cholangitis, choledocholithiasis, cholecystitis Biliary Colic is a temporary blockage, cholecystitis is inflammation from obstruction of cystic duct, cholangitis is infection of the biliary tree.

Anatomy

Pathophysiology
Three types of stones, cholesterol, brown pigment & black pigment stones. Formation of each types is caused by crystallization of bile. Cholesterol stones most common. They are often radiolucent but cast strong acoustic shadows on ultrasonography. Cholesterol stones are often multiple and medium-sized, but when solitary attain a large size and have a radiating crystalline cross-sectional appearance. Bile consists of lethicin, bile acids, phospholipids in a fine balance. Impaired motility can predispose to stones.

Pathophysiology

Bile sludge is crystals without stones. It may be a first step in stones, or be independent of it. Pigment stones (15%) are from calcium bilirubinate. Diseases that increase RBC destruction will cause these. Also in cirrhotic patients, parasitic infections.

Pathology

Gallstones passing through biliary system may cause biliary colic or pancreatitis Stone obstruction at the gallbladder neck with superimposed infection leads to cholecystitis Obstruction of common bile duct with superimposedinfection leads to septic cholangitis Migration of a large stone into the gut may cause intestinal obstruction (gallstone ileus)

Sequle of gall stones

Cholangitis, sepsis Pancreatitis Perforation (10%) GS ileus (mortality 20% as diagnosis difficult). Hepatitis Choledocholithiasis(Obstructive jaundice) Gall bladder carcinoma 0.08% in sympt.pat.

Harvest Time

Frequency
Affected by race, ethnicity, sex, medical conditions, fertility. In USA 20 million have GS. Every year 1-2% of people develop them. Internationally: 20% of women, 14% of men. Patients over 60 prevalence was 12.9% for men, 22.4% for women.

Morbidity/Mortality

Every year 1-3% of patients develop symptoms. Asymptomatic GS are not associated with fatalities. Morbidity and mortality is associated only with symptomatic stones.

Race

Highest in fair skinned people of northern European descent and in Hispanic populations. High in Pima Indians (75% of elderly). In addition Asians with stones are more likely to have pigmented stones than other populations. African descent with Sickle Cell Anemia.



Sex
More common in women. Etiology may be secondary to variations in estrogen causing increased cholesterol secretion, and progesterone causing bile stasis. Pregnant women more likely to have symptoms. Women with multiple pregnancies at higher risk Oral contraceptives, estrogen replacement tx.


Age
It is uncommon for children to have gallstones. If they do, its more likely that they have congenital anomalies, biliary anomalies, or hemolytic pigment stones. Incidence of GS increases with age 1-3% per year.

History

3 clinical stages: asymptomatic, symptomatic, and with complications (cholecystitis, cholangitis, CBD stones). Most (60-80%) are asymptomatic A history of epigastric pain with radiation to shoulder may suggest it. A detailed history of pattern and characteristics of symptoms as well as US make the diagnosis.

History

Most patients develop symptoms before complications. Once symptoms occur, severe symptoms develop in 3-9%, with complications in 1-3% per year, and a cholecystectomy rate of 3-8% per year. Indigestion, bloating, fatty food intolerance occur in similar frequencies in patients without gallstones, and are not cured with cholecystectomy.

History

Best definition of colic is pain that is severe in epigastrium or RUQ that last 1-5 hrs, often waking patient at night. In classic cases pain is in the RUQ, however visceral pain and GB wall distension may be only in the epigastric area. Once peritoneum irritated, localizes to RUQ. Small stones more symptomatic.



Physical
Vital signs and physical findings in asymptomatic cholelithiasis are completely normal.Fever, tachycardia, hypotension, alert you to more serious infections, including cholangitis, cholecystitis.Murphy’s sign

Causes

Fair, fat, female, fertile of course. High fat diet Obesity Rapid weight loss, TPN, Ileal disease, NPO. Increases with age, alcoholism. Diabetics have more complications. Hemolytics

Differentials

AAA(Abdominal Aortic Aneurysm) Appendicitis Cholangitis. Diverticulitis Gastroenteritis, hepatitis IBD, MI, SBO Pancreatitis, renal colic, pneumonia

Investigations:

Labs with asymptomatic cholelithiasis and biliary colic should all be normal. WBC, elevated LFTS may be helpful in diagnosis of acute cholecystitis, but normal values do not rule it out.

Investigations:

Elevated WBC is expected but not reliable. In retrospective study, only 60% of patients with cholecytitis had a WBC greater than 11,000. A WBC greater than 15,000 may indicate perforation or gangrene. ALT, AST, AP more suggestive of CBD stones Amylase elevation may be GS pancreatitis.

Imaging Studies

US and Hida test. Plain x-rays, CT scans ERCP are adjuncts. X-rays: 15% stones are radiopaque, porcelain GB may be seen. Air in biliary tree, emphysematous GB wall. CT: for complications, ductal dilatation, surrounding organs. Misses 20% of GS. Get if diagnosis uncertain.

CT Scan

Plain Films

Imaging

Ultrasound is 95% sensitive for stones, 80% specific for cholecystitis. It is 98% sensitive and specific for simple stones.Wall thickening >4mmDistensionPericholecystic fluid, sonographic Murphy’s.Dilated CBD>7mm

Ultrasound

Ultrasound

Imaging

Hida scan documents cystic duct patency. 94% sensitive, 85% specific GB should be visualized in 30 min. If GB visualized later it may point to chronic cholecystitis. CBD obstruction appears as non visualization of small intestine. False positives, high bilirubin.

Hida

Imaging

ERCP is diagnostic and therapeutic. Provides radiographic and endoscopic visualization of biliary tree. Do when CBD dilated and elevated LFTs. Complications include bleeding, perforation, pancreatitis, cholangitis.

ERCP

Management


Asymptomatic• No treatment required unless diabetic or undergoingmajor immunosuppression (risk factors for cholecystitis)Prophylactic• An attack of acute pancreatitis, cholangitis or obstructivejaundice is usually an indication for prophylacticcholecystectomyBiliary colic• Elective cholecystectomy, now usually performedlaparoscopically, for classic symptoms with ultrasound proven gallstones.Chronic cholecystitis• Elective laparoscopic cholecystectomy only if no evidenceof peptic ulcer disease or other cause for symptoms

Acute cholecystitisIntravenours fluids, antibiotics, early or intervalEmpyemaPercutaneous (ultrasound- or CT-guided) drainage ofgallbladder and interval cholecystectomyAscending chotangitis• Prompt and energetic treatment mandatory ifsepticaemia/systemic inflammatory response syndrome is to be avoided. • Intravenous fluids, antibiotics, ductal drainage (now usually by ERCP, sphincterotomy and extraction of stones)• Mortality 15-20% among patients requiring urgentdecompression for severe cholangitis

Emergency Department Care

Suspect GB colic in patients with RUQ pain of less than 4-6h duration radiating to back. Consider acute cholecystits in those with longer duration of pain, with or without fever. Elderly and diabetics do not tolerate delay in diagnosis and can proceed to sepsis.

Emergency Department Care

After assessment of ABCs, perform standard IV, pulse oximetry, ECG, and monitoring. Send labs while IV placed, include cultures if febrile. Primary goal of ED care is diagnosis of acute cholecystitis with labs, US, and or Hida. Once diagnosed, hospitalization usually necessary. Some treated as OP.


Emergency Department Care
In patients who are unstable or in severe pain, consider a bedside US to exclude AAA and to assist in diagnosis of acute cholecystitis. Replace volume with IVF, NPO, +/- NGT. Administer pain control early. A courtesy call to surgery may give them time to examine without narcotics.

Consults

Historically cholecystits was operated on emergently which increased mortality. Surgical consult is appropriate, and depending on the institution, either medicine or surgery may admit the patients for care.

Medications

Anticholinergics such as Bentyl (dicyclomine hydrochloride)to decrease GB and biliary tree tone. (20mg IM q4-6). Demerol 25-75mg IV/IM q3 Antiemetics (phenergan, compazine). Antibiotics :Zosyn(Piperacillin-Tazobactam) 3.375g IV q6) need to cover Ecoli(39%), Klebsiella(54%), Enterobacter(34%), enterococci, group D strep.

Further Inpatient Care

Cholecystectomy can be performed after the first 24-48h or after the inflammation has subsided. Unstable patients may need more urgent interventions with ERCP, percutaneous drainage, or cholecystectomy. Lap chole very effective with few complications (4%). 5% convert to open. In acute setting up to 50% open.

Laparoscopic Cholecystectomy

Laparoscopic Cholecystectomy



Further Outpatient Care
Afebrile, normal VS Minimal pain and tenderness. No markedly abnormal labs, normal CBD, no pericholecystic fluid. No underlying medical problems. Next day follow-up visit. Discharge on oral antibiotics, pain meds.


Table 1.1 Indications for emergency surgical intervention inpatients with acute cholecystitis.
Progression of the disease despite conservative treatment Failure to improve within 24 h especially in patients > 60years old. Presence of an inflammatory mass in the right hypochondrium Detection of gas in the gallbladder/biliary tract Established generalized peritonitis Development of intestinal obstruction


Complications of cholecystectomy• Leakage of bile from cystic duct or gallbladder bed• Jaundice due to retained ductal stones. Retained stones can be treated by ERCP or if a T-tube is in place by extraction with a Dormia basket down the T-tube track (Burhenne manoeuvre) • Injury to the common bile duct

Prognosis

Uncomplicated cholecystitis as a low mortality. Emphysematous GB mortality is 15% Perforation of GB occurs in 3-15% with up to 60% mortality. Gangrenous GB 25% mortality.