Fever + Vomiting + Abdominal Pain in a Known Case of Gallbladder Stone

Differential Diagnosis (in Order of Likelihood)

1. Acute Calculous Cholecystitis (MOST COMMON)

• Right upper quadrant (RUQ) or epigastric pain - often constant and severe, lasting >6 hours (unlike biliary colic which is self-limited)
• Nausea and vomiting
• Fever (typically >38°C / 100.4°F)
• Murphy's sign - cessation of inspiration on deep palpation of the RUQ; sonographic Murphy's sign + gallstones has a positive predictive value of 92% for acute cholecystitis
• Leukocytosis, elevated CRP
• No jaundice (unless concurrent choledocholithiasis)

2. Acute Cholangitis (SERIOUS - DO NOT MISS)

• Charcot's Triad = RUQ pain + Fever (with rigors) + Jaundice
  • The full triad is present in ~70% of patients; fever alone is nearly universal (~95%)
• Reynolds Pentad (severe/suppurative cholangitis) = Charcot's triad + Hypotension + Altered mental status - indicates gram-negative septicemia
• Lab: Leukocytosis + elevated bilirubin + elevated alkaline phosphatase
• The most lethal biliary complication - "pus under pressure in the bile ducts leads to rapid spread of bacteria via the liver into the blood"

3. Gallstone Pancreatitis

• Epigastric pain radiating to the back
• Nausea, vomiting, fever
• Elevated serum amylase/lipase (>3x upper limit of normal)
• Can range from mild self-limited to severe necrotizing pancreatitis
• Fever + chills with biliary pain imply a complication; an elevated serum bilirubin/ALP suggests common duct involvement

Key Differentiating Features

Investigations

1. Blood: CBC (leukocytosis), CRP, LFTs (bilirubin, ALP, ALT - elevated in CBD involvement), serum amylase/lipase, blood cultures (if septic)
2. Imaging:
   • Ultrasound abdomen - first-line; shows gallstones, gallbladder wall thickening >4mm, pericholecystic fluid, sonographic Murphy's sign, ductal dilatation (>6mm CBD suggests choledocholithiasis)
   • MRCP - if jaundice/deranged LFTs are present, to evaluate the CBD and rule out choledocholithiasis
   • CT abdomen - for complications (perforation, abscess, necrotizing pancreatitis)
   • ERCP - both diagnostic and therapeutic for CBD stones/cholangitis
3. ECG and baseline vitals - assess hemodynamic stability

Management

Acute Cholecystitis

1. NPO + IV fluid resuscitation
2. IV Antibiotics: Mild-moderate: cefoxitin or cefuroxime/cefazolin; Severe or broad-spectrum: piperacillin-tazobactam or 3rd-generation cephalosporin + metronidazole
3. Analgesia (IV opioids)
4. Cholecystectomy: Early laparoscopic cholecystectomy (within 3 days) is preferred over delayed surgery - meta-analyses show shorter total hospital stay (9.6 days early vs 17.8 days delayed), lower mortality, and no increase in bile duct injury (Sleisenger & Fordtran)
5. Percutaneous cholecystostomy: For high-risk patients unfit for surgery (severe cardiac, pulmonary, or liver disease)

Acute Cholangitis

1. Fluid resuscitation + broad-spectrum IV antibiotics (covering gram-negatives + anaerobes)
2. Biliary drainage within 24 hours if responds to antibiotics; emergent if no response
   • ERCP is gold standard (90-95% success rate) - allows stone extraction, sphincterotomy, stent placement
   • PTBD (percutaneous transhepatic biliary drainage) - if ERCP fails or anatomy is altered
   • Surgical drainage - reserved for failure of other methods
3. After control of acute episode: cholecystectomy to prevent recurrence

Gallstone Pancreatitis

1. NPO, aggressive IV fluids, analgesia
2. Cholecystectomy during the same admission (once pancreatitis settles) to prevent recurrence - same-admission cholecystectomy is strongly recommended
3. ERCP - indicated if concurrent cholangitis or persistent biliary obstruction

Red Flags Requiring Urgent Action

• Hypotension or altered mental status (Reynolds pentad = septic cholangitis - emergency decompression)
• Signs of gallbladder perforation (peritonitis - urgent surgery)
• Gangrenous/emphysematous cholecystitis (WBC >15,000, male, diabetic, cardiovascular disease)
• Worsening despite 48-72 hours of conservative management

Clinical Analysis: Gallstone Patient with Fever 102°F, Single Vomit, No Pain, No Tenderness

The Key Diagnostic Puzzle

• At least 1 LOCAL sign - Murphy's sign, RUQ pain/tenderness/mass ← ABSENT here
• Plus a systemic sign (fever, elevated WBC/CRP)

Most Likely Diagnosis: Acute Cholangitis (Mild/Early, Atypical Presentation)

"Fever is almost universal, occurring in 95% of patients... jaundice is clinically detectable in only 80%... peritoneal signs are found in only 15% of patients. Older adult patients in particular may present solely with mental confusion, lethargy, and delirium."

"In some cases, particularly in elderly and immunodeficient patients, clinical symptoms such as fever and abdominal pain may be less pronounced or even absent."

Tokyo Guidelines 2018 - Cholangitis Diagnostic Criteria

Differential Diagnoses to Consider

Immediate Investigations (Urgent)

1. CBC - leukocytosis supports systemic inflammation (elevated WBC in 80% of cholangitis)
2. LFTs - bilirubin (>2 mg/dL in 80% of cholangitis), ALP, GGT (most sensitive for CBD stone), ALT/AST
3. CRP - inflammatory marker
4. Serum amylase/lipase - to exclude concurrent gallstone pancreatitis
5. Blood cultures x2 - positive in majority of cholangitis cases, especially during fever spikes; "the organism in the blood is invariably the same as that in bile" (Sleisenger & Fordtran)
6. Urine routine - exclude UTI as alternative cause of fever

1. Ultrasound abdomen (URGENT) - look for:
   • CBD dilatation (>6 mm with gallbladder in situ = strong predictor of choledocholithiasis)
   • CBD stone (sensitivity ~50-73%, specificity 91%)
   • Gallbladder wall thickening / pericholecystic fluid
   • Intrahepatic biliary dilatation
2. MRCP - if USG inconclusive; highly accurate for CBD stones and bile duct anatomy, non-invasive
3. EUS (endoscopic ultrasound) - superior sensitivity for distal CBD stones if MRCP unavailable

Management

1. Admit to hospital, NPO
2. IV fluid resuscitation
3. Broad-spectrum IV antibiotics immediately (cover gram-negatives + anaerobes):
   • Mild: cefoxitin 2g IV q6-8h
   • Moderate-severe: piperacillin-tazobactam 3.375g IV q6h, OR gentamicin + ampicillin + metronidazole, OR meropenem if resistant organisms suspected
4. Monitor closely - patient should improve within 6-12 hours; if fever worsens, mental status deteriorates, or hypotension develops → Reynolds pentad = emergency biliary decompression
5. ERCP within 24-48 hours for biliary drainage + stone extraction - gold standard; >80% of patients respond to antibiotics + drainage
6. Cholecystectomy after the acute episode resolves, to prevent recurrence

Bottom Line for This Patient

The absence of abdominal pain and tenderness does NOT rule out serious biliary pathology. In a known gallstone patient with 102°F fever, you must actively exclude acute cholangitis - which presents without Charcot's triad in ~74% of cases. Check LFTs and CBD diameter on USG urgently. If fever + elevated bilirubin/ALP + dilated CBD is found, this is cholangitis until proven otherwise and requires early IV antibiotics and ERCP.