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Billing code lookup
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Interpretation guide
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Bronchiolitis
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
Bronchiolitis
POCUS
Procedures
Medications
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
First look triage
▶
Apnea
Cyanosis
Severe work of breathing
Altered mental status
Poor perfusion
Immediate escalation triggers
▶
Recurrent apnea
SpO2 persistently <90% on room air
Exhaustion with rising CO2
Airway and breathing
▶
Positioning
▶
Sniffing position for infant
Head tilt chin lift if obstructed
Suction strategy
▶
Nasal suction prior to feeds
Deep suction only if obstruction not relieved and deterioration
Oxygenation targets
▶
SpO2 goal 90% or higher for most infants
Higher target if significant cardiopulmonary disease
Ventilatory support escalation
▶
If persistent hypoxemia, low flow nasal cannula
If persistent distress, high flow nasal cannula
If failure of noninvasive support, CPAP or intubation
Circulation and hydration
▶
Hydration assessment
▶
Intake reduction
Urine output decline
Clinical dehydration
Fluid strategy
▶
Oral feeds if safe
NG feeds if respiratory status allows
IV isotonic fluids if unable to feed
Shock differential if hypotension
▶
Sepsis
Dehydration
Congenital heart disease
Isolation and infection prevention
▶
Droplet and contact precautions
Cohorting during outbreaks
Key concepts
▶
Primary disease frame
▶
Viral lower airway inflammation and edema
Increased mucus and small airway obstruction
Air trapping with atelectasis risk
High risk phenotypes
▶
Age under 12 weeks
Prematurity
Chronic lung disease
Hemodynamically significant congenital heart disease
Immunodeficiency
Neuromuscular weakness
Monitoring and reassessment
Monitoring plan
▶
Continuous pulse oximetry for moderate to severe disease
Intermittent SpO2 checks for improving mild disease
Respiratory rate trend
Work of breathing trend
Feeding tolerance trend
Failure criteria
▶
Rising oxygen requirement
Persistent tachypnea with fatigue
Recurrent apnea
Worsening hypercapnia on blood gas
Inability to maintain hydration
History
Presentation pattern
Typical course
▶
Upper respiratory prodrome
▶
Rhinorrhea
Cough
Low grade fever
Progression to lower respiratory symptoms
▶
Wheeze or crackles
Increased work of breathing
Feeding difficulty
Peak severity day 3 to 5
▶
Worst work of breathing
Highest risk of dehydration
Red flag symptoms
▶
Apnea episodes
Cyanosis
Lethargy
Poor feeding with minimal urine output
Persistent vomiting with dehydration
Exposure context
▶
Sick contacts
Daycare exposure
Household smoke exposure
Risk factors and comorbidities
Host risk
▶
Age under 12 weeks
Prematurity history
Prior ICU admission for respiratory illness
Medical comorbidities
▶
Bronchopulmonary dysplasia
Congenital heart disease
Immunodeficiency
Neuromuscular disease
Airway anomalies
Atopy and wheeze history
▶
Prior recurrent wheeze episodes
Eczema
Family history of asthma
Prior response to bronchodilator
Physical Exam
Respiratory severity
Work of breathing
▶
Nasal flaring
Intercostal retractions
Subcostal retractions
Head bobbing
Grunting
Respiratory rate and pattern
▶
Tachypnea
Periodic breathing
Apnea
Auscultation
▶
Diffuse crackles
Wheeze
Prolonged expiration
Diminished air entry
Oxygenation and ventilation
▶
Room air SpO2
Central cyanosis
Signs of hypercapnia
▶
Somnolence
Poor respiratory effort
General and hydration
General appearance
▶
Alertness
Consolability
Toxic appearance
Hydration indicators
▶
Mucous membranes
Tears
Capillary refill
Fontanelle fullness
Urine output estimate
Perfusion and cardiac findings
▶
Heart rate
Murmur
Hepatomegaly
Edema
PITFALLS
Pitfall set
▶
Early bronchiolitis with minimal wheeze
Apnea predominant presentation in young infants
High fever suggesting alternative diagnosis
Focal lung findings suggesting pneumonia or atelectasis
Poor feeding as primary sign of severity
Differential Diagnosis
Life threatening and must not miss
Critical alternatives
▶
Bacterial pneumonia ICD-10 J13 to J18
▶
Focal crackles
High fever
Toxic appearance
Sepsis ICD-10 A41.9
▶
Hypothermia or fever
Poor perfusion
Lethargy
Congenital heart disease with heart failure ICD-10 Q20 to Q28
▶
Hepatomegaly
Poor weight gain
Diaphoresis with feeds
Foreign body aspiration ICD-10 T17
▶
Sudden onset
Unilateral wheeze
Asymmetric breath sounds
Upper airway emergencies
▶
Croup ICD-10 J05.0
▶
Barky cough
Stridor
Epiglottitis ICD-10 J05.1
▶
Drooling
Tripod posture
Mimics and overlaps
Wheezing illnesses
▶
Early childhood asthma ICD-10 J45
▶
Recurrent episodes
Atopy
Viral induced wheeze SNOMED CT 442696006
▶
Older infant or toddler
Prior wheeze history
Structural and chronic
▶
Tracheomalacia SNOMED CT 95434002
Cystic fibrosis ICD-10 E84
Primary ciliary dyskinesia SNOMED CT 127665003
Laboratory Tests
Routine testing strategy
Default approach
▶
No routine labs for typical mild to moderate bronchiolitis
Testing driven by severity and alternative diagnosis concern
Viral testing limited utility for routine management
▶
Consider if cohorting or high risk admission decisions
Sepsis evaluation triggers
▶
Age under 28 days with fever
Toxic appearance
Hemodynamic instability
Targeted labs when indicated
Hydration and metabolic
▶
Serum electrolytes for significant dehydration
▶
Sodium for free water and feeding issues
Potassium for vomiting or poor intake
Glucose for lethargy or poor feeding
▶
Hypoglycemia risk in young infants
Blood gas for severe disease
▶
Capillary or venous blood gas if impending failure
▶
Rising PaCO2 surrogate
Acidemia trend
Oxygenation assessment limited on venous sample
Arterial blood gas if ventilation strategy decisions critical
▶
PaCO2 in mmHg
PaO2 in mmHg
Infection evaluation if bacterial concern
▶
Complete blood count for toxic appearance
▶
Limited discrimination for viral vs bacterial
Blood culture for sepsis concern
▶
Higher yield in neonates
Diagnostic Tests
Scoring Systems
Severity scoring overview
▶
Purpose
▶
Structured severity tracking
Communication across teams
Limitations
▶
Scores do not replace clinical trajectory
Variable interrater reliability
Wang bronchiolitis severity score
▶
Components
▶
Respiratory rate
Wheeze
Retractions
General condition
Interpretation
▶
Higher score correlates with more severe disease
Respiratory Distress Assessment Instrument
▶
Components
▶
Wheeze phase
Wheeze location
Retractions sites
Use case
▶
Clinical trials
Serial bedside documentation
Modified Tal score
▶
Components
▶
Respiratory rate
Wheeze
Retractions
SpO2
MRI
MRI role
▶
Generally not indicated for bronchiolitis
Consider only for alternate diagnosis evaluation
▶
Mediastinal mass
Vascular ring
Practical limits
▶
Sedation risk in infants
Delay to care
CT
CT role
▶
Generally not indicated for typical bronchiolitis
Consider only for specific alternative diagnoses
▶
Foreign body with unclear radiographs
Complicated pneumonia with abscess concern
Risks
▶
Ionizing radiation in infants
Need for sedation in some cases
Ultrasound
Point of care lung ultrasound
▶
Potential findings
▶
B lines
Subpleural consolidations
Pleural line abnormalities
Use case
▶
Distinguishing atelectasis vs pneumonia in select cases
Minimizing radiography when expertise available
Cardiac ultrasound
▶
Use case
▶
Suspected congenital heart disease decompensation
Suspected myocarditis
Findings supporting heart failure
▶
Reduced ventricular function
Volume overload signs
Disposition
Level of care decisions
Disposition framework
▶
Mild disease criteria
▶
SpO2 90% or higher on room air
Minimal work of breathing
Adequate oral intake
Reliable caregivers
Ward admission criteria
▶
Need for supplemental oxygen
Moderate work of breathing
Poor feeding requiring NG or IV fluids
High risk comorbidities
ICU criteria
▶
Apnea
Rapidly escalating oxygen or respiratory support
Persistent hypoxemia despite high flow support
Hypercapnia with fatigue
Hemodynamic instability
Transfer criteria
▶
Need for pediatric ICU unavailable locally
Need for intubation or advanced ventilation
High risk infant with worsening trajectory
Discharge readiness
Copy
Safe discharge elements
▶
Stable on room air with SpO2 90% or higher
Feeding adequate for hydration
Caregiver comfort with nasal suction and feeding plan
Return precautions understood
Follow up plan within 24 to 48 hours if higher risk
Treatment
Supportive care core
Support bundle
▶
Nasal suction
▶
Before feeds and sleep
Avoid aggressive deep suction if causing trauma
Oxygen therapy
▶
Low flow nasal cannula starting point
Wean to room air when SpO2 stable 90% or higher
Avoid continuous monitoring in stable improving mild cases
Hydration and nutrition
▶
Small frequent feeds
NG feeds if safe and persistent poor intake
IV isotonic fluids if unable to tolerate enteral
Fever control
▶
Acetaminophen 15 mg per kg PO or PR every 4 to 6 hours
▶
Maximum 75 mg per kg per day
Maximum 4000 mg per day
Ibuprofen 10 mg per kg PO every 6 to 8 hours if age 6 months or older
▶
Maximum 40 mg per kg per day
Airway and ventilation escalation
▶
High flow nasal cannula
▶
Initiate for persistent moderate to severe distress
Weight based flow per local protocol
Titrate flow and FiO2 to SpO2 goal
Failure signals
▶
Rising FiO2 requirement
Worsening retractions
Rising PaCO2 on blood gas
CPAP
▶
Consider for high flow failure with persistent distress
Monitor for gastric distension
Intubation and mechanical ventilation
▶
If apnea or exhaustion with hypercapnia
Preoxygenation strategy to minimize desaturation
Post intubation sedation and analgesia plan
Medications and therapies with limited routine role
Bronchodilators
▶
Routine use not recommended for classic bronchiolitis
If trial considered, predefined response criteria
▶
Improved work of breathing
Improved aeration
Improved SpO2 with reduced support
Albuterol trial dosing
▶
MDI with spacer 2 to 4 puffs
▶
Reassess after 10 to 15 minutes
Nebulized albuterol 2.5 mg for 10 to 15 kg
▶
Weight adjusted dosing per local protocol
Stop if no objective response
Nebulized epinephrine
▶
Not recommended routinely
Consider only in select settings per local protocol
Corticosteroids
▶
Not recommended routinely
Consider alternative diagnosis
▶
Asthma phenotype
Croup overlap
Hypertonic saline
▶
Not for ED routine use
Consider inpatient pathway in select institutions
Antibiotics
▶
Not indicated for uncomplicated bronchiolitis
Indications
▶
Confirmed bacterial pneumonia
Acute otitis media with clear diagnosis
Sepsis concern
Example inpatient pneumonia regimen
▶
Ampicillin IV 50 mg per kg every 6 hours for uncomplicated bacterial pneumonia
▶
Adjust for local resistance patterns
Evidence and guideline framing
Guideline alignment
▶
Supportive care as primary therapy
Avoid routine bronchodilator use
Avoid routine corticosteroids
Avoid routine antibiotics
Avoid routine chest radiography for typical cases
Evidence levels mapping
▶
High certainty recommendations for avoiding routine ineffective therapies
Conditional trials only with objective response criteria
Escalation based on respiratory failure physiology rather than virus identification
Special Populations
Pregnancy
Special population notes
▶
Bronchiolitis definition primarily pediatric
Adult RSV lower respiratory infection may mimic bronchiolitis pattern
Pregnancy respiratory physiology
▶
Reduced functional residual capacity
Lower tolerance for hypoxemia
Medication cautions
▶
Avoid unnecessary medications
Oxygenation target individualized for maternal fetal status
Geriatric
Special population notes
▶
Bronchiolitis uncommon as a diagnostic label in older adults
RSV lower respiratory infection considerations
▶
Higher risk of hypoxemia
Higher risk of decompensation with COPD or CHF
Disposition sensitivity
▶
Lower threshold for admission with comorbidity burden
Pediatrics
Pediatric specific management
▶
Weight based dosing for all medications
Feeding safety
▶
Avoid oral feeds if severe tachypnea with aspiration risk
NG feeds as preferred over IV when feasible
Apnea risk
▶
Highest risk in young infants
Higher risk with prematurity
High risk comorbidities
▶
Chronic lung disease
Congenital heart disease
Immunodeficiency
Social safety factors
▶
Caregiver ability
Access to follow up
Distance to hospital
Background
Epidemiology
Population burden
▶
Most common lower respiratory infection in infants
Peak incidence in first year of life
Seasonal clustering in winter months in many regions
Viral causes
▶
RSV as leading cause
Rhinovirus
Human metapneumovirus
Parainfluenza
Influenza
Risk stratification
▶
Highest hospitalization rates in young infants
Prematurity increases severity risk
Smoke exposure increases severity risk
Pathophysiology
Airway level mechanisms
▶
Bronchiolar epithelial infection
Mucosal edema
Mucus plugging
Impaired mucociliary clearance
Gas exchange consequences
▶
Ventilation perfusion mismatch
Air trapping
Atelectasis
Increased work of breathing
Apnea mechanism
▶
Immature respiratory control in young infants
Upper airway obstruction and hypoxemia contribution
Therapeutic Considerations
Why supportive care works
▶
Disease self limited in most cases
Interventions target oxygenation and hydration
Time and secretion management as main modifiers
Why many medications do not help
▶
Airway obstruction driven by edema and mucus more than bronchospasm
Bronchodilator response limited and phenotype dependent
Steroids do not reliably change edema course in typical bronchiolitis
Respiratory support physiology
▶
High flow nasal cannula reduces work of breathing via washout and mild distending pressure
CPAP recruits atelectatic units and reduces airway collapse
Mechanical ventilation reserved for failure and apnea
Patient Discharge Instructions
copy discharge instructions
Copy
Home care plan
▶
Nasal saline drops with gentle suction before feeds and sleep
Small frequent feeds
Maintain hydration with usual milk or formula
Fever comfort care with acetaminophen as directed by weight
Smoke free environment
Expected course
▶
Cough and congestion can last 1 to 2 weeks
Worst breathing often occurs around days 3 to 5
Return to ED now
▶
Trouble breathing
Fast breathing that is worsening
Skin pulling in between ribs or under ribs
Grunting or head bobbing
Blue lips or face
Pauses in breathing
Too sleepy to feed
Fewer than half normal wet diapers
Signs of dehydration
▶
Very dry mouth
No tears when crying
Follow up
▶
Primary care visit in 24 to 48 hours if symptoms not improving
Earlier follow up for infants under 3 months or high risk conditions
References
Guidelines and evidence sources
Clinical guideline set
▶
American Academy of Pediatrics bronchiolitis guideline
National Institute for Health and Care Excellence bronchiolitis guideline
Canadian Paediatric Society bronchiolitis guidance
Evidence summaries
▶
Systematic reviews on bronchodilators in bronchiolitis
Systematic reviews on corticosteroids in bronchiolitis
Trials and meta analyses on high flow nasal cannula in bronchiolitis
Coding and terminology references
▶
ICD-10 bronchiolitis J21.0 RSV bronchiolitis
ICD-10 bronchiolitis J21.1 human metapneumovirus bronchiolitis
ICD-10 bronchiolitis J21.8 other specified organisms
ICD-10 bronchiolitis J21.9 unspecified bronchiolitis
SNOMED CT bronchiolitis disorder concept mapping for problem list use
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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Bronchiolitis