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Approach to the Critical Patient
Immediate priorities
Stabilization priorities
Airway and ventilation compromise from polytrauma
If altered mental status or impending airway compromise, RSI pathway
Hemorrhagic shock triggers
If SBP < 90 mmHg or shock index > 1, massive hemorrhage pathway
Concomitant injuries pattern
High-energy mechanism
Fall from height
Analgesia early
If severe pain, IV opioid titration with monitoring
If opioid-sparing needed, regional anesthesia pathway
Limb-threatening checks
Distal perfusion status
If absent radial pulse or cool hand, emergent reduction/splinting and vascular imaging
Compartment syndrome risk
If escalating pain out of proportion or tense compartments, emergent surgical consult
Open fracture contamination
If open wound, immediate antibiotics and tetanus protocol
Key decision points
Early stratification
Isolated closed fracture with intact neurovascular exam
ED splinting and outpatient ortho follow-up pathway
Open fracture
Immediate antibiotics
Urgent orthopedic consult for operative debridement
Neurovascular deficit
Radial nerve palsy documentation
Vascular compromise escalation
Polytrauma
Trauma team activation criteria
Monitoring and documentation
Essential documentation set
Neurovascular exam pre- and post-splint
Radial pulse
Capillary refill
Motor and sensory exam by nerve distribution
Skin integrity
Blistering
Threatened skin tenting
Pain trajectory
Worsening pain after splint as red flag
Imaging timestamps
Pre-reduction films if deformity severe and time allows
Post-splint alignment films
History
Focused trauma history
Mechanism and energy
Mechanism details
Direct blow
Twisting injury
MVC or fall from height
Timing
Time since injury
Time since last oral intake if operative risk
Open wound context
Contaminated environment
Farm injury
Symptoms and function
Pain pattern
Pain at rest
Pain with minimal movement
Neurologic symptoms
Dorsal hand numbness
Wrist or finger extension weakness
Vascular symptoms
Hand coolness
Hand color change
Baseline risk and modifiers
Anticoagulants and antiplatelets
Warfarin
DOAC use
Bone health
Osteoporosis
Prior fragility fractures
Comorbidities affecting healing
Diabetes
Smoking and nicotine
Malnutrition risk
Infection risk
Immunosuppression
MRSA colonization history
Physical Exam
Upper extremity exam
Inspection and alignment
Deformity
Varus or valgus angulation
Shortening
Swelling and ecchymosis
Expanding hematoma concern
Skin blistering
Open wound features
Wound size
Visible bone
Palpation and stability
Tenderness localization
Proximal third
Middle third
Distal third
Crepitus
Gentle exam only
Compartment firmness
Tense compartments
Pain with passive finger stretch
Neurovascular exam
Vascular status
Pulses
Radial pulse
Ulnar pulse
Perfusion
Capillary refill
Skin temperature
Radial nerve function
Motor
Wrist extension
MCP extension
Sensory
Dorsal first web space sensation
Median nerve function
Motor
Thumb opposition
AIN pinch
Sensory
Palmar index fingertip
Ulnar nerve function
Motor
Finger abduction
Froment sign
Sensory
Palmar small fingertip
PITFALLS
Common misses
Radial nerve palsy not documented pre-splint
Medicolegal risk
Alters operative timing discussions
Vascular compromise masked by pain meds
Recheck after analgesia and splint
Shoulder and elbow injuries overlooked
Joint line tenderness screen
Differential Diagnosis
Traumatic upper arm pain differential
Humeral shaft fracture diagnoses
Closed humeral shaft fracture
ICD-10 S42.30x
SNOMED CT humeral shaft fracture
Open humeral shaft fracture
ICD-10 S42.32x
Gustilo-Anderson grade as modifier
Mimics and associated injuries
Proximal humerus fracture
Shoulder swelling and ecchymosis
Supracondylar distal humerus fracture
Elbow effusion
Shoulder dislocation
Loss of deltoid contour
Elbow dislocation
Obvious deformity at elbow
Brachial artery injury
Diminished pulses
Radial nerve neurapraxia without fracture
Isolated dorsoradial sensory change
Pathologic fracture
Minimal trauma mechanism
Cancer history
Laboratory Tests
Labs by context
Minimal labs for isolated closed fracture
No routine labs needed
If no planned procedural sedation
If no anticoagulant concern
Point-of-care glucose if altered mental status
Hypoglycemia exclusion
Open fracture and operative pathway labs
Baseline labs
Complete blood count for anemia or infection context
Electrolytes and renal function for perioperative planning
Coagulation testing
If anticoagulant use, INR and aPTT
If liver disease or bleeding concern, INR
Type and screen
If high-energy trauma or large hematoma
Trauma adjuncts
Venous blood gas if shock concern
Lactate mmol/l for perfusion trend
Creatine kinase if crush component
Rhabdomyolysis screening
Diagnostic Tests
Scoring Systems
Classification and severity tools
AO/OTA humeral diaphysis classification
12-A simple
12-B wedge
12-C complex
Gustilo-Anderson open fracture classification
Type I
Type II
Type IIIA
Type IIIB
Type IIIC
Neurovascular status as functional severity marker
Radial nerve palsy present
Vascular compromise present
MRI
Advanced soft tissue imaging
Indications
Suspected occult fracture with normal radiographs and persistent focal pain
Suspected tendon rupture if exam suggests
Limitations
Not first-line for acute shaft fracture alignment decisions
Availability and time constraints in acute trauma
CT
Cross-sectional imaging
Indications
Suspicion of intra-articular extension at shoulder or elbow
Preoperative planning for comminution
Vascular CT angiography triggers
If hard signs of vascular injury, CTA upper extremity
If expanding hematoma, CTA upper extremity
Limitations
Radiation exposure
Contrast nephrotoxicity risk in vulnerable patients
Ultrasound
Point-of-care ultrasound uses
Vascular assessment adjunct
Doppler signal in radial and ulnar arteries
Comparison with contralateral side
Hematoma evaluation
Expanding hematoma tracking
Suspicion of pseudoaneurysm as trigger for CTA
Regional anesthesia guidance
Brachial plexus block support if trained operator available
Plain radiographs
Standard imaging set
Humerus AP and lateral including shoulder and elbow
Shoulder films if proximal pain
Alignment descriptors
Angulation degree
Displacement percentage
Shortening estimate
Disposition
Level of care decisions
Discharge criteria
Closed fracture
Pain controlled with oral regimen
Intact distal neurovascular status
Acceptable alignment in splint
No threatened skin
No progressive swelling
Reliable follow-up within 1 week
Ortho appointment arranged
Admission or transfer criteria
Open fracture
Urgent orthopedic management
IV antibiotics ongoing
Neurovascular compromise
Vascular surgery consult or transfer if unavailable
Compartment syndrome concern
Emergent operative evaluation
Polytrauma
Trauma service admission
Follow-up timing
Nonoperative management pathway
Ortho follow-up 3 to 7 days
Repeat radiographs at follow-up
Radial nerve palsy pathway
Early ortho follow-up
Document baseline deficits and evolution
Treatment
Immobilization and reduction
Initial immobilization
Coaptation splint or hanging arm cast option
Splint choice based on swelling and comfort
Post-splint radiographs for alignment
Sling and swathe adjunct
Comfort
Shoulder support
Reduction considerations
Closed reduction attempt if severe angulation or skin tenting
If neurovascular compromise, prioritize realignment and splint
Post-reduction neurovascular exam documentation
Analgesia and sedation
Multimodal analgesia
Acetaminophen PO 1000 mg q6h
Maximum 4000 mg per 24 hours
Lower maximum in liver disease
Ibuprofen PO 400 mg q6 to 8h
Avoid in CKD, GI bleed risk, anticoagulation as clinically appropriate
Maximum 2400 mg per 24 hours
Opioid for breakthrough pain
Morphine IV 0.05 mg/kg
Titrate every 10 to 15 minutes to effect
Respiratory monitoring
Hydromorphone IV 0.01 mg/kg
Titrate every 10 to 15 minutes to effect
Avoid coadministration with other sedatives when possible
Procedural sedation if reduction required
Ketamine IV 1 mg/kg
Additional 0.5 mg/kg doses as needed
Continuous cardiorespiratory monitoring
Propofol IV 0.5 mg/kg
Titrate 0.25 mg/kg every 1 to 3 minutes
Hypotension risk monitoring
Antibiotics and tetanus
Open fracture antibiotics
Cefazolin IV 2 g
Repeat every 8 hours while awaiting operative care
If weight > 120 kg, 3 g dosing consideration per institutional protocol
If severe beta-lactam allergy, clindamycin IV 900 mg
Repeat every 8 hours
C difficile risk context
If gross contamination or farm injury, add gram-negative coverage per protocol
Gentamicin IV 5 mg/kg
Renal dosing adjustments
Tetanus prophylaxis
Tdap if immunization unknown or not up to date
Clean wound threshold
Dirty wound threshold
Tetanus immune globulin if incomplete immunization and dirty wound
Administer at separate site from vaccine
Operative versus nonoperative pathways
Nonoperative management indications
Closed fracture with acceptable alignment
Varus or valgus angulation within local orthopedic thresholds
No progressive neurovascular deficit
Functional bracing transition
Sarmiento brace after swelling subsides
Early elbow and shoulder ROM as guided
Operative management indications
Open fracture
Irrigation and debridement timing
Fixation planning
Vascular injury
Emergent repair and stabilization coordination
Floating elbow or ipsilateral forearm fractures
Stability needs
Failed nonoperative management
Progressive displacement
Nonunion concern
Pathologic fracture
Oncology and ortho coordination
Radial nerve palsy management
Initial palsy with closed fracture
Observation pathway commonly appropriate
Document baseline deficits
Serial exams
Splinting for wrist drop
Cock-up wrist splint
Hand therapy referral planning
Secondary palsy after manipulation
Urgent orthopedic consult
Consider entrapment
Consider iatrogenic injury
Vascular injury pathway
Hard signs escalation
If pulseless limb, emergent consultation and CTA if not delaying definitive care
Immediate splint realignment first if deformity severe
Avoid prolonged ischemia time
Antithrombotic considerations
Individualized with vascular team
Bleeding risk context
Operative timing
Special Populations
Pregnancy
Pregnancy-specific considerations
Imaging safety
Plain radiographs with shielding when feasible
CT only if benefits outweigh risks
Analgesia considerations
Acetaminophen preferred baseline
NSAID avoidance in later pregnancy context
Trauma pathway
Maternal stabilization priority
Fetal assessment per gestational age
Geriatric
Older adult considerations
Fragility fracture context
Osteoporosis evaluation referral
Vitamin D and calcium counseling pathway
Medication safety
Opioid sensitivity and delirium risk
NSAID renal and GI risk
Healing risk
Higher nonunion risk factors
Malnutrition screening
Pediatrics
Pediatric considerations
Nonaccidental trauma screen when appropriate
Inconsistent history
Additional injuries
Growth plate and adjacent injury screening
Shoulder and elbow physeal injury consideration
Low threshold for additional views
Weight-based analgesia
Acetaminophen PO 15 mg/kg
Ibuprofen PO 10 mg/kg
Immobilization choice
Comfort and compliance emphasis
Early ortho follow-up
Background
Epidemiology
Frequency and associations
Humeral shaft fractures as adult long-bone injury subset
Bimodal distribution
High-energy trauma in younger adults
Common associated injuries
Ipsilateral shoulder injury
Ipsilateral elbow injury
Nerve injury association
Radial nerve most commonly affected
Pathophysiology
Mechanisms and anatomy
Diaphyseal fracture patterns
Spiral
Transverse
Comminuted
Radial nerve course vulnerability
Spiral groove proximity
Distal third risk near lateral intermuscular septum
Healing biology
Callus formation with relative stability
Nonunion risk with instability and smoking
Therapeutic Considerations
Management principles
Alignment and function goals
Preserve shoulder and elbow ROM
Pain control enabling mobilization
Nonoperative success concept
Functional bracing allows micromotion and callus
Requires close follow-up for alignment
Antibiotic timing for open fractures
Earlier administration associated with lower infection risk
Evidence phrasing for ED practice
Class I recommendation for immediate antibiotics in open fractures by orthopedic trauma consensus
ACEP Level C support for early neurovascular documentation and reassessment as standard emergency care practice
Patient Discharge Instructions
copy discharge instructions
Discharge instructions set
Immobilization care
Keep splint clean and dry
Elevation of arm above heart when resting
Activity limits
No lifting or pushing with injured arm
Finger and hand motion exercises if allowed by splint
Pain control plan
Acetaminophen dosing schedule
NSAID use only if safe for kidneys and stomach
Opioid only for breakthrough pain
Return to ED immediately
New numbness or weakness in hand
Fingers turning blue or very pale
Increasing swelling with severe pain not controlled by meds
Splint feels too tight or new severe pain with finger movement
Fever or worsening wound drainage
Follow-up plan
Orthopedic follow-up within 3 to 7 days
Repeat imaging at follow-up as directed
Wound care for open wounds
Keep dressing intact until reviewed
Antibiotics completion if prescribed
References
Clinical guidelines and evidence sources
Orthopedic trauma guidance
AAOS and orthopedic trauma society resources on humeral shaft fracture management
Nonoperative functional bracing principles
Operative indications
Open fracture prophylaxis consensus
Early IV antibiotics
Tetanus prophylaxis standards
Emergency medicine references
ACEP procedural sedation clinical policy for ED sedation practices
Monitoring standards
Agent safety considerations
ACEP Level C consensus for documentation and reassessment standards in extremity trauma
Neurovascular checks pre- and post-immobilization
Discharge safety netting
SymptomDx is an educational tool for medical professionals. It does not replace clinical judgment. Verify all clinical data and drug dosages with authoritative sources.