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dx.
Clinical Reference
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Interpretation guide
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Interpretation guide
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Acalculous Cholecystitis
Cardiovascular Presentations
Abdominal aortic aneurysm
Acute coronary syndrome (NSTEMI)
Acute coronary syndrome (STEMI)
Acute decompensated heart failure
Acute limb ischemia
Acute mesenteric ischemia
Aortic dissection
Aortic stenosis
Atrial fibrillation and flutter
Bradyarrhythmia and heart block
Cardiac arrest
Deep vein thrombosis
Myocarditis
Pericarditis
Pulmonary embolism
Stable angina
Superficial thrombophlebitis
Superior vena cava syndrome
Supraventricular tachycardia
Syncope (cardiogenic)
Unstable angina
Ventricular tachycardia
Respiratory Presentations
Acute bronchitis
Acute respiratory failure
Aspiration pneumonia
Asthma exacerbation
Bronchiolitis
Community-acquired pneumonia
COVID-19 pneumonia
COPD exacerbation
Croup
Croup (laryngotracheobronchitis)
Epiglottitis
Hemothorax
Hospital-acquired pneumonia
Pleural effusion
Pneumothorax (traumatic)
Pulmonary contusion
Spontaneous pneumothorax
Neurological Presentations
Bell's palsy
Benign paroxysmal positional vertigo
Brain abscess
Cauda equina syndrome
Cervical radiculopathy
Concussion (mild traumatic brain injury)
Encephalitis
Guillain-Barré syndrome
Hemorrhagic stroke (intracerebral)
Ischemic stroke
Lumbar radiculopathy
Malignant spinal cord compression
Migraine
Peripheral neuropathy (acute)
Retropharyngeal abscess
Schizophrenia (acute exacerbation)
Seizure (breakthrough:known epilepsy)
Seizure (first-time)
Spinal cord injury
Status epilepticus
Subarachnoid hemorrhage
Tension headache
Transient ischemic attack
Traumatic brain injury (moderate-severe)
Vestibular neuritis
Viral meningitis
Gastrointestinal Presentations
Acute appendicitis
Acute cholecystitis
Acute diverticulitis
Acute pancreatitis
Anal fissure
Choledocholithiasis and cholangitis
Clostridioides difficile colitis
Gastritis
Gastroenteritis (viral and bacterial)
Gastroesophageal reflux disease
Incarcerated or strangulated hernia
Inflammatory bowel disease flare
Large bowel obstruction
Lower GI hemorrhage
Peptic ulcer disease
Perforated viscus
Small bowel obstruction
Upper GI hemorrhage
Genitourinary and Reproductive Presentations
Acute prostatitis
Acute urinary retention
Ectopic pregnancy
Epididymitis
Orchitis
Ovarian torsion
Paraphimosis
Pelvic inflammatory disease
Priapism
Pyelonephritis
Renal laceration
Ruptured ovarian cyst
Testicular torsion
Tubo-ovarian abscess
Urinary tract infection (uncomplicated)
Urolithiasis (renal colic)
Vaginal bleeding (non-pregnant)
Infectious Disease Presentations
Acute sinusitis
Acute tonsillitis
Acute upper respiratory infection
Animal bite
Bacterial meningitis
Cellulitis
Conjunctivitis (bacterial)
Dental abscess
Endocarditis
Febrile neutropenia
Fournier gangrene
Hand-foot-mouth disease
Hepatitis (acute)
Herpes zoster
HIV-related illness
Human bite
Impetigo
Infected diabetic foot ulcer
Infectious mononucleosis
Influenza
Necrotizing fasciitis
Osteomyelitis
Otitis externa
Parasitic infection
Periorbital cellulitis
Peritonsillar abscess
Scabies
Sepsis
Septic arthritis
Spontaneous bacterial peritonitis
Tick-borne illness (Lyme disease)
Tinea infection
Tuberculosis
Viral exanthem
Wound infection
Trauma Presentations
Achilles tendon rupture
ACL and mceniscus tear
Ankle fracture
Ankle sprain
Burn
Calcaneus fracture
Cervical spine fracture
Clavicle fracture
Dental avulsion
Distal radius fracture
Drowning
Elbow fracture and dislocation
Electrical injury
Facial bone fracture
Facial laceration
Femur fracture
Fingertip amputation
Forearm fracture (radius and ulna)
Frostbite
Hand:finger laceration
Heat exhaustion
Heat stroke
Hip fracture
Humeral shaft fracture
Knee dislocation
Knee sprain
Lightning injury
Mandible fracture
Metacarpal fracture
Metatarsal fracture
Muscle strain
Nasal fracture
Non-accidental trauma
Orbital fracture
Patella fracture
Phalanx fracture (finger)
Proximal humerus fracture
Pulmonary contusion
Rib fracture
Rotator cuff tear (acute traumatic)
Scalp laceration
Scaphoid fracture
Shoulder dislocation
Skull fracture
Splenic laceration
Sternal fracture
Supracondylar pediatric fracture
Tendon laceration (hand:wrist)
Thoracic and lumbar spine fracture
Tibia:fibula fracture
Tibial plateau fracture
Toe fracture
Traumatic epistaxis
Traumatic hyphema
Toxicologic Presentations
Acetaminophen toxicity
Alcohol intoxication
Alcohol withdrawal
Anticholinergic toxicity
Anticoagulant overdose
Benzodiazepine overdose
Benzodiazepine:sedative overdose
Beta-blocker and calcium channel blocker toxicity
Carbon monoxide poisoning
Caustic ingestion
Digoxin toxicity
Drug eruption
Foreign body ingestion
Opioid intoxication
Opioid overdose
Opioid withdrawal
Organophosphate
Salicylate toxicity
Serotonin syndrome
Stimulant intoxication (cocaine, methamphetamine)
Tricyclic antidepressant overdose
Psychiatric Presentations
Acute anxiety
Acute psychosis
Agitation:behavioral emergency
Bipolar disorder
Conversion disorder
Major depressive episode
Neuroleptic malignant syndrome
Suicidal ideation and attempt
Musculoskeletal and Rheumatologic Presentations
Acute low back pain (mechanical)
Bursitis
Cervical radiculopathy
Costochondritis
Gout (acute)
Lumbar radiculopathy
Pseudogout
Tendinitis
Dermatology Presentations
Acute eczema (Eczema acute flare)
Allergic contact dermatitis
Erythema multiforme
Henoch-Schönlein purpura
Pressure injury
Psoriasis (acute flare)
Stevens-Johnson syndrome
Toxic epidermal necrolysis
Urticaria (acute)
Environmental and Exposure Presentations
Envenomation (snake, spider, insect)
High-altitude illness
Hypothermia
Hematologic and Oncologic Presentations
Acute chest syndrome
Coagulopathy
Hyperviscosity syndrome
Sickle cell crisis (vaso-occlusive)
Symptomatic anemia
Thrombocytopenia (severe)
Tumor lysis syndrome
Pediatric-Specific Presentations
Bronchiolitis
Croup
Emergency delivery
Febrile seizure
Kawasaki disease
Neonatal jaundice
Neonatal sepsis
Nursemaid's elbow
Pediatric fever 0 to 28 days
Pediatric fever 29 to 60 days
Pediatric fever 61 to 90 days
Pyloric stenosis
Slipped capital femoral epiphysis
Intussusception
Endocrine and Metabolic Presentations
Adrenal crisis
Diabetic ketoacidosis
Hypercalcemia
Hyperosmolar hyperglycemic state
Hypertensive emergency
Hypertensive urgency
Hypoglycemia
Myasthenia gravis crisis
Myxedema coma
Severe hyperkalemia
Severe hyponatremia
Thyroid storm
ENT and Maxillofacial Presentations
Acute laryngitis
Acute otitis media
Acute pharyngitis
Cerumen impaction
Epistaxis (anterior)
Nasal foreign body
Otitis externa
Tympanic membrane perforation
Ophthalmologic Presentations
Acute angle-closure glaucoma
Central retinal artery occlusion
Chemical eye injury
Corneal abrasion
Corneal ulcer
Globe rupture
Ocular foreign body
Orbital cellulitis
Retinal detachment
Obstetric Presentations
Hyperemesis gravidarum
Painful vaginal bleeding in pregnancy
Placenta previa
Placental abruption
Preeclampsia:eclampsia
Preterm labor
Threatened:inevitable:incomplete abortion
Systemic and Miscellaneous Presentations
Anaphylaxis
Angioedema
Cannabis-induced hyperemesis
Acalculous Cholecystitis
POCUS
Procedures
Calculators
Resuscitation
ECG Guide
Back
Clinical Assessment Checklist
Browse categories and answer follow-up questions to refine your symptom profile.
Approach to the Critical Patient
Immediate priorities
Recognition in the critically ill
▶
Unexplained sepsis or septic shock without identified source
▶
Acalculous cholecystitis as occult source in ICU patient
Rising vasopressor requirement without alternative cause
New organ dysfunction in prolonged ICU stay
▶
Rising WBC and inflammatory markers
Feeding intolerance and abdominal distension
Subtle presentation in sedated or intubated patient
▶
Classic biliary symptoms frequently absent
High index of suspicion based on clinical trajectory
Airway and breathing threats
▶
Sepsis-associated respiratory compromise
▶
SpO2 < 90% on room air
Rising work of breathing
If airway protection inadequate, rapid sequence intubation preparation
▶
Depressed mental status from sepsis
Aspiration risk during deterioration
Circulation and shock threats
▶
Septic shock physiology
▶
SBP < 90 mmHg
MAP < 65 mmHg
Hypoperfusion markers
▶
Lactate >= 2 mmol/l
Oliguria and altered mentation
If septic shock, broad-spectrum antibiotics within 1 hour
▶
Surviving Sepsis Campaign Class I recommendation
Blood cultures before antibiotics when feasible
Time-critical actions
Resuscitation bundle
▶
IV crystalloid resuscitation
▶
30 ml/kg balanced crystalloid for sepsis-induced hypoperfusion
Reassess volume status to avoid overload
Source identification
▶
Right upper quadrant ultrasound at bedside
CT abdomen when ultrasound equivocal
If gangrene or perforation suspected, urgent surgical activation
▶
Peritoneal signs on exam
Imaging showing wall necrosis or pericholecystic gas
Source control planning
▶
Early definitive intervention reduces mortality
▶
Laparoscopic cholecystectomy within 1 to 3 days when surgical candidate
Percutaneous cholecystostomy when poor surgical candidate
Multidisciplinary escalation
▶
Surgery for operative decision
Interventional radiology for drainage
Key decision points
Two distinct patient populations
▶
Critically ill ICU patient
▶
Ischemia and stasis-driven pathology
High mortality and subtle presentation
Outpatient or community patient
▶
Viral or autoimmune etiology
Often more benign and may respond to conservative care
Consultation triggers
▶
Surgical consultation mandatory in all confirmed cases
▶
Operative vs drainage pathway
Risk stratification by Tokyo Guidelines grade
Interventional radiology
▶
Cholecystostomy in non-operative candidates
Gastroenterology
▶
EUS-guided gallbladder drainage for non-surgical candidates
History
Presentation pattern
Classic triad
▶
Right upper quadrant pain
▶
Onset, severity, and progression
Radiation to right shoulder or scapula
Fever
▶
Chills and rigors
Antipyretic use masking
Nausea and vomiting
▶
Anorexia
Feeding intolerance in ICU patient
Atypical and occult presentation
▶
Sedated or intubated ICU patient
▶
Unexplained sepsis as only manifestation
New organ dysfunction without classic biliary symptoms
Altered mental status as sole sign
▶
Delirium in older adult
Subtle decline in critically ill
Clinical context
ICU and critical illness context
▶
Duration of critical illness
▶
Prolonged mechanical ventilation
Vasopressor requirement
Recent surgery or trauma
▶
Major operative stress
Burns
Nutritional context
▶
Prolonged fasting
Total parenteral nutrition use
Outpatient context
▶
Recent viral illness
▶
Epstein-Barr virus in children
Hepatitis A
Autoimmune or rheumatic disease
▶
Systemic vasculitis
Connective tissue disease
Important negatives
▶
No prior gallstone history
▶
Absence of biliary colic episodes
No documented cholelithiasis on prior imaging
No prior cholecystectomy
▶
Prior cholecystectomy excludes diagnosis
Risk factors
Critical illness drivers
▶
Sepsis and shock
▶
Cardiac arrest and resuscitation
Major trauma
Prolonged ICU exposures
▶
Mechanical ventilation
Vasopressor-induced splanchnic ischemia
Comorbid and host factors
▶
Vascular disease
▶
Atherosclerosis
Diabetes mellitus
Cardiac disease
▶
Congestive heart failure
Recent myocardial infarction
Immunosuppression
▶
HIV or AIDS with CMV or Cryptosporidium cholangiopathy
Bone marrow transplant or chemotherapy
Demographic risk
▶
Age over 50 years
▶
92.8% of patients over 50 in one series
Increasing comorbidity burden
Pediatric viral triggers
▶
Epstein-Barr virus and enteroviruses
Hepatitis A
Physical Exam
Vital signs and general
Stability snapshot
▶
Temperature
▶
Fever as systemic inflammatory marker
Hypothermia as severe sepsis marker
Heart rate and blood pressure
▶
Tachycardia in sepsis
SBP < 90 mmHg as shock marker
Mental status
▶
Altered mentation as sepsis sign
May be only sign in ICU patient
General appearance
▶
Toxic appearance
▶
Diaphoresis
Rigors
Jaundice
▶
Present in minority
Suggests concomitant obstruction or severe inflammation
Abdominal exam
Right upper quadrant findings
▶
Tenderness
▶
With or without guarding
Localized to gallbladder fossa
Murphy sign
▶
Inspiratory arrest with right upper quadrant palpation
Often unreliable in sedated or intubated patient
Palpable mass
▶
Distended gallbladder
Phlegmon in advanced disease
Distension and bowel activity
▶
Abdominal distension
▶
Ileus from peritoneal irritation
Feeding intolerance correlate
Bowel sounds
▶
Decreased or absent
Associated ileus
Complication and PITFALLS
Peritoneal signs
▶
Rebound tenderness
▶
Perforation concern
Gangrenous cholecystitis concern
Rigidity
▶
Diffuse peritonitis
Surgical emergency
PITFALLS
▶
Exam unreliable in critically ill
▶
Sedation masks tenderness
Maintain suspicion based on trajectory
Murphy sign limitations
▶
Reduced sensitivity in older adults
Difficult to elicit in obtunded patient
Differential Diagnosis
Biliary and hepatic mimics
Acute calculous cholecystitis
▶
Most common mimic
▶
Distinguished by gallstones on imaging
Lower gangrene rate than acalculous disease
Shared presentation
▶
Right upper quadrant pain and fever
Positive Murphy sign
Ascending cholangitis
▶
Charcot triad
▶
Fever, jaundice, right upper quadrant pain
ICD-10 K83.0
Imaging clue
▶
Common bile duct dilation
Biliary obstruction
Hepatic abscess
▶
Fever and right upper quadrant pain
▶
Rim-enhancing collection on CT
ICD-10 K75.0
Non-biliary mimics
Acute pancreatitis
▶
Epigastric pain radiating to back
▶
Elevated lipase
ICD-10 K85.9
Peptic ulcer disease or perforation
▶
Epigastric pain
▶
Free air on imaging
ICD-10 K27.9
Right lower lobe pneumonia
▶
Referred right upper quadrant pain
▶
Cough and infiltrate on chest radiograph
ICD-10 J18.9
Mesenteric ischemia
▶
Pain out of proportion to exam
▶
Lactate elevation
Vascular risk factors
Fitz-Hugh-Curtis syndrome
▶
Perihepatitis in young women
▶
Pelvic inflammatory disease association
Right upper quadrant pain
Acute acalculous cholecystitis
▶
ICD-10 K81.0 acute cholecystitis
▶
SNOMED CT acalculous cholecystitis concept
Consider when ICU sepsis source unexplained
Laboratory Tests
Infection and inflammation
Complete blood count
▶
Leukocytosis with left shift
▶
Nonspecific but expected
WBC > 18,000 supports Tokyo Grade II
Neutrophil-to-lymphocyte ratio
▶
Elevated NLR correlates with severity
Lower lymphocyte counts in Grade III
Inflammatory markers
▶
C-reactive protein
▶
Trend over time
Limited specificity
Procalcitonin
▶
Bacterial infection support
Severity trending
Hepatobiliary and metabolic
Liver function tests
▶
Transaminases
▶
Mild elevation from cytolysis
Marked elevation suggests alternative pathology
Bilirubin
▶
Mild elevation possible
Cholestatic pattern less common than calculous disease
Pancreatic and perfusion
▶
Lipase
▶
Rule out pancreatitis
Normal in uncomplicated acalculous cholecystitis
Lactate
▶
>= 2 mmol/l in sepsis or ischemia
Repeat to assess resuscitation response
Microbiology and pre-procedure
Cultures
▶
Blood cultures
▶
Before initiating antibiotics
Two sets from separate sites
Bile culture
▶
Obtained at cholecystostomy or cholecystectomy
Guides targeted antibiotic therapy
Pre-procedural labs
▶
Coagulation studies
▶
INR and platelets before drainage or surgery
Correct coagulopathy prior to intervention
Renal function and electrolytes
▶
Antibiotic dosing adjustment
Contrast safety assessment
Diagnostic Tests
Scoring Systems
Tokyo Guidelines TG18 severity grading
▶
Grade I mild
▶
No organ dysfunction
Mild inflammatory changes
Grade II moderate
▶
WBC > 18,000
Palpable right upper quadrant mass
Symptom duration > 72 hours
Marked local inflammation
Grade III severe
▶
Cardiovascular dysfunction requiring vasopressors
Neurologic, respiratory, renal, hepatic, or hematologic dysfunction
Surgical risk stratification
▶
Charlson Comorbidity Index
▶
CCI >= 4 identifies poor surgical candidates
Guides cholecystostomy decision
ASA Physical Status
▶
ASA >= 3 suggests high perioperative risk
Favors percutaneous drainage
Limitations
▶
Grading guides but does not replace clinical judgment
▶
Serial reassessment required
Trajectory supersedes single score
MRI
MRI and MRCP role
▶
Problem-solving indications
▶
Suspected concomitant choledocholithiasis
Equivocal ultrasound and CT
Findings
▶
Gallbladder wall thickening and edema
Pericholecystic fluid
Limitations
▶
Limited availability in unstable patient
Not first-line in critically ill
Contraindications
▶
Hemodynamic instability
▶
Transport risk
Monitoring constraints
Incompatible implants
▶
Non-conditional devices
Screening required
CT
CT abdomen indications
▶
Equivocal ultrasound
▶
Comparable diagnostic accuracy to ultrasound
Useful when bedside imaging nondiagnostic
Complication evaluation
▶
Perforation
Pericholecystic abscess
CT findings
▶
Gallbladder wall thickening and distension
Pericholecystic fat stranding and fluid
Mural gas in emphysematous or gangrenous disease
Contrast and evidence
▶
Contrast considerations
▶
Renal function assessment
Allergy history
Guidance
▶
CT preferred when ultrasound equivocal in ICU patient
ACEP Level C recommendation for adjunctive cross-sectional imaging
Ultrasound
Right upper quadrant ultrasound first-line
▶
Wall thickening
▶
Gallbladder wall > 3 mm
Reports up to 3.5 to 9 mm
Distension
▶
Short-axis diameter > 40 mm
Tense gallbladder fossa
Other features
▶
Pericholecystic fluid
Sludge without stones
Performance and pitfalls
▶
Diagnostic accuracy
▶
Sensitivity approximately 81%
Specificity approximately 83%
Sonographic Murphy sign
▶
Limited utility in sedated patient
Operator dependent
ICU pitfall
▶
Wall thickening and sludge common in ICU without cholecystitis
Serial imaging and clinical correlation essential
HIDA scan adjunct
▶
Gold standard test
▶
Non-filling of gallbladder at 4 hours
Accuracy up to 95%
Limitations
▶
Impractical in unstable patient
False positives with fasting or TPN
Disposition
Level of care
Admission for all confirmed or suspected cases
▶
Not an outpatient diagnosis
▶
Risk of gangrene and perforation
Mandatory surgical consultation
Surgical floor
▶
Hemodynamically stable patients
Awaiting cholecystectomy
ICU admission indications
▶
Sepsis or hemodynamic instability
▶
Vasopressor requirement
Rising lactate despite resuscitation
Tokyo Grade III organ dysfunction
▶
Respiratory or renal failure
Multiorgan involvement
Consults and follow up
Copy
Specialty consultation
▶
Surgery
▶
Operative decision in all cases
Timing of cholecystectomy
Interventional radiology
▶
Percutaneous cholecystostomy when non-operative
Gastroenterology
▶
EUS-guided gallbladder drainage option
Discharge and follow up criteria
▶
Post-cholecystectomy discharge
▶
Tolerating diet
Pain controlled and afebrile
No signs of complication
Post-cholecystostomy follow up
▶
Tube management
Interval cholecystectomy at 8 to 13 weeks if candidate
Conservatively managed follow up
▶
Repeat imaging in 4 to 6 weeks
Recurrence rate approximately 9.8% over long-term follow up
Treatment
Initial stabilization
Resuscitation and supportive care
▶
IV fluid resuscitation
▶
Balanced crystalloid for hypoperfusion
Electrolyte correction
NPO status
▶
During acute illness
Pending surgical decision
Analgesia
▶
Acetaminophen as first-line
Minimize opioids given bile stasis risk
Nutritional strategy
▶
Avoid total parenteral nutrition where possible
▶
Recognized risk factor for acalculous cholecystitis
Transition to enteral feeding when feasible
Adequate hydration
▶
Support splanchnic perfusion
Prevent further ischemia
Empiric antibiotics
Risk-stratified empiric coverage
▶
Not critically ill
▶
Amoxicillin-clavulanate when local Enterobacteriaceae resistance < 20%
1.2 g IV every 8 hours
Critically ill
▶
Piperacillin-tazobactam 4.5 g IV every 6 to 8 hours
Extended infusion per local protocol
Beta-lactam allergy
▶
Ciprofloxacin 400 mg IV every 12 hours plus metronidazole 500 mg IV every 8 hours
Amikacin plus metronidazole alternative
ESBL and resistant organism risk
▶
Ertapenem
▶
1 g IV every 24 hours
ESBL coverage without antipseudomonal pressure
Meropenem
▶
Reserve for septic shock with ESBL risk
1 g IV every 8 hours
Tigecycline
▶
Alternative for multidrug-resistant organisms
Avoid in bacteremia-predominant illness
Antibiotic precautions
▶
Avoid hepatotoxic agents
▶
Cholestasis increases toxicity risk
Monitor liver enzymes
Aminoglycoside caution
▶
Keep courses brief
Increased nephrotoxicity during cholestasis
Definitive source control
Laparoscopic cholecystectomy
▶
Gold-standard definitive therapy
▶
Ideally within 1 to 3 days of diagnosis
Laparoscopic preferred over open
Early intervention benefits
▶
Fewer complications 11.8% vs 34.4%
Shorter length of stay 5.4 vs 10.0 days
Percutaneous cholecystostomy
▶
Indications
▶
Severely ill poor surgical candidate
ASA >= 3 or CCI >= 4
Septic shock
Outcomes
▶
Controls disease in approximately 85% of patients
Higher complication rate than cholecystectomy 65% vs 12% in one trial
Role as bridge or definitive therapy
▶
Bridge to interval cholecystectomy at 8 to 13 weeks
Definitive if patient remains non-surgical
Alternative drainage and conservative care
▶
EUS-guided gallbladder drainage
▶
Emerging option for non-surgical candidates
Avoids external drain complications
Antibiotics alone
▶
Consider for viral or rheumatic disease-associated cases
Recurrence rate approximately 9.8% over long-term follow up
Special Populations
Pregnancy
Pregnancy considerations
▶
Imaging approach
▶
Ultrasound as first-line without radiation
MRI without gadolinium when cross-sectional needed
Antibiotic selection
▶
Beta-lactams generally preferred
Avoid fluoroquinolones and tetracyclines
Surgical timing
▶
Cholecystectomy safest in second trimester
Percutaneous drainage as temporizing option
Maternal and fetal monitoring
▶
Maintain maternal SpO2 >= 95%
Fetal monitoring at viable gestation
Geriatric
Older adult features
▶
Atypical presentation
▶
Afebrile infection common
Delirium as primary symptom
Higher comorbidity burden
▶
Increased surgical risk
Favors cholecystostomy in frail patients
Medication adjustments
▶
Renal dosing of antibiotics
Avoid nephrotoxic combinations
Mortality consideration
▶
Myocardial infarction or heart failure as independent risk factor for in-hospital death
Cardiac evaluation and ECG
Pediatrics
Pediatric differences
▶
Etiology
▶
Viral infection most common trigger
Epstein-Barr virus and hepatitis A
Course
▶
Often more benign than adult ICU disease
Conservative management frequently appropriate
Weight-based antibiotics
▶
Piperacillin-tazobactam 100 mg/kg per dose IV every 8 hours
Ampicillin-sulbactam 50 mg/kg per dose of ampicillin component IV every 6 hours
Surgical considerations
▶
Cholecystectomy if no response to conservative care
Pediatric surgery involvement
Background
Epidemiology
Frequency and burden
▶
Proportion of acute cholecystitis
▶
Accounts for 5 to 10% of all acute cholecystitis
Predominantly affects critically ill patients
Mortality
▶
Historically up to 30% in critically ill cohorts
Approximately 2.5% in-hospital mortality in contemporary series
Complication rates
▶
Gangrenous cholecystitis
▶
31.2% in acalculous vs 5.6% in calculous disease
High perforation risk if diagnosis delayed
Age distribution
▶
92.8% of patients over 50 years in one series
Increasing with comorbidity burden
Pathophysiology
Central mechanisms
▶
Gallbladder ischemia
▶
Hypoperfusion and low-flow states
Vasopressor-induced splanchnic ischemia
Bile stasis
▶
Prolonged fasting and TPN
Absent enteral stimulation of gallbladder emptying
Inflammatory cascade
▶
Nonobstructive injury
▶
Ischemia-reperfusion injury
Eicosanoid-mediated inflammation
Progression
▶
Wall edema and necrosis
Gangrene and perforation
Systemic disease concept
▶
Manifestation of systemic illness
▶
Reflects critical illness rather than local stone disease
Two etiologic populations of ICU and community
Therapeutic Considerations
Source control principles
▶
Early intervention reduces mortality
▶
Cholecystectomy within 1 to 3 days
Cholecystostomy for non-operative candidates
Tailored to surgical risk
▶
Tokyo grade
ASA and Charlson Comorbidity Index
Antibiotic stewardship
▶
Risk-stratified empiric therapy
▶
De-escalate per bile and blood cultures
Avoid hepatotoxic and prolonged aminoglycoside courses
Coverage targets
▶
Enterobacteriaceae and enterococci
Anaerobes in severe disease
Interval cholecystectomy debate
▶
May be unnecessary in survivors
▶
When stones absent and precipitating condition resolves
Distinct from calculous disease management
Patient Discharge Instructions
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Home care after gallbladder treatment
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Take all antibiotics exactly as prescribed until finished
Rest and stay well hydrated
Follow any low-fat diet advice if your gallbladder was preserved
Keep surgical or drain sites clean and dry
Warning signs to return to the ER
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Fever or shaking chills
Worsening abdominal pain
Yellowing of skin or eyes
Persistent nausea or vomiting
Inability to keep fluids down
Redness, swelling, or drainage from a wound or tube site
Follow up
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Surgical follow up in 2 to 4 weeks after cholecystectomy
Drain or tube management appointments if a cholecystostomy was placed
Repeat imaging in 4 to 6 weeks if treated without surgery
Recovery expectations
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Gradual improvement expected after treatment
Report any return of pain or fever promptly
Attend all scheduled follow-up visits
References
Guidelines and key sources
Guideline sources
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Tokyo Guidelines TG18 for acute cholecystitis grading and management
World Society of Emergency Surgery acute cholecystitis recommendations
Surviving Sepsis Campaign for septic shock management
Key reviews and studies
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Gallaher and Charles, Acute Cholecystitis: A Review, JAMA 2022
Huffman and Schenker, Acute Acalculous Cholecystitis: A Review, Clin Gastroenterol Hepatol 2010
Barie and Eachempati, Acute Acalculous Cholecystitis, Curr Gastroenterol Rep 2003
Sadaka, Tseng, Itani, Percutaneous Cholecystostomy Drainage, JAMA Surgery 2025
Coding standards
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ICD-10 K81.0 acute cholecystitis
SNOMED CT acalculous cholecystitis disorder concept
SymptomDx is an educational tool for medical professionals. It does not replace clinical judgment. Verify all clinical data and drug dosages with authoritative sources.
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Management Protocols
Acalculous Cholecystitis