Dka diagnosis

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Diabetic Ketoacidosis (DKA) - Diagnosis

Definition

DKA is a syndrome in which insulin deficiency and glucagon excess combine to produce a hyperglycemic, dehydrated, acidotic patient with profound electrolyte imbalances. It is most common in Type 1 diabetes but can occur in Type 2, and approximately 25% of DKA episodes occur in patients with previously undiagnosed diabetes.

Goldman-Cecil Medicine, p. 1143

ADA Diagnostic Criteria

Parameter	DKA	HHS (for comparison)
Plasma glucose	>250 mg/dL	>600 mg/dL
Arterial/venous pH	<7.30	>7.30
Serum bicarbonate	≤18 mEq/L	>15 mEq/L
Serum ketones / β-hydroxybutyrate	Positive	Negative or small
Anion gap	>10-12 mEq/L	<12 mEq/L
Serum osmolality	Variable	>320 mOsm/kg

Key note: Euglycemic DKA (glucose ≤300 mg/dL) occurs in up to 18% of patients - especially in pregnant patients and those taking SGLT2 inhibitors (e.g., empagliflozin, dapagliflozin). Do not rule out DKA based on glucose alone.

Symptom to Diagnosis, p. 5344 | Tintinalli's Emergency Medicine, Table 227-3 | Barash Clinical Anesthesia, p. 3011

Clinical Features

Symptoms:

Polyuria, polydipsia, polyphagia
Nausea, vomiting
Abdominal pain (in ~50% of patients, especially children)
Visual blurring, weakness, weight loss

Signs:

Kussmaul breathing (deep, rapid respirations - respiratory compensation for acidosis)
Fruity/acetone odor on the breath
Tachycardia
Hypotension or orthostatic changes
Signs of dehydration
Altered mental status (correlates with serum osmolality >320 mOsm/L, not just acidosis)
Rosen's Emergency Medicine, p. 3720-3722

Pathophysiology (Brief)

Insulin deficiency leads to:

Increased lipolysis → free fatty acids transported to liver → ketoacid production (acetoacetate, β-hydroxybutyrate)
Hyperglycemia → osmotic diuresis → profound dehydration and electrolyte losses
Counter-regulatory hormones (glucagon, cortisol, catecholamines) amplify these effects

The high NADH/NAD ratio drives production of β-hydroxybutyrate over acetoacetate. This matters clinically: the standard urine dipstick (nitroprusside test) detects acetoacetate but NOT β-hydroxybutyrate - it can underestimate or even miss ketosis. As treatment proceeds, β-hydroxybutyrate converts to acetoacetate, and the dipstick may paradoxically become "more positive." Direct serum β-hydroxybutyrate measurement is preferred.

Goldman-Cecil Medicine, p. 1157 | Rosen's Emergency Medicine, p. 3698

Diagnostic Workup

Essential labs:

Serum glucose
Basic metabolic panel (anion gap, bicarbonate, potassium, renal function)
Venous blood gas (correlates well with arterial pH; preferred to avoid arterial puncture)
Serum β-hydroxybutyrate (more sensitive than urine ketones)
Urinalysis (confirm ketonuria; screen for UTI as precipitant)
Magnesium and phosphate levels

Additional tests to consider:

CBC with differential (leukocytosis is common from stress/hemoconcentration; bandemia >10,000/mm³ suggests infection)
Lactate (lactic acidosis can co-exist)
Serum lipase if pancreatitis suspected (must be 3x upper limit of normal to diagnose pancreatitis - lipase is preferred over amylase, which is non-specifically elevated in DKA)
ECG (assess for hyperkalemia/hypokalemia; rule out MI as precipitant)
Blood/urine cultures if infection suspected
Chest X-ray if indicated

Key electrolyte caveats:

Potassium: Serum K+ is usually normal or HIGH initially (acidosis drives K+ out of cells), but total body K+ is depleted. With insulin therapy and correction of acidosis, K+ rapidly drops and can become life-threatening. Do not give insulin if K+ <3.3 mEq/L.
Sodium: Often falsely low due to hyperglycemia. Correct by adding 2.4 mEq/L for every 100 mg/dL glucose above 100 mg/dL (correction factor of 2.4 is preferred over older 1.6, especially with glucose >400 mg/dL).
Anion gap: Calculated as Na⁺ - (Cl⁻ + HCO₃⁻). Rarely, a normal anion gap can occur if the patient has been aggressively rehydrated with normal saline (hyperchloremic acidosis) or if vomiting causes a concomitant metabolic alkalosis.
Tintinalli's Emergency Medicine, p. 3033 | Rosen's Emergency Medicine, p. 3737-3758

Severity Classification (ADA)

Feature	Mild	Moderate	Severe
pH	7.25-7.30	7.00-7.24	<7.00
Bicarbonate	15-18 mEq/L	10-14 mEq/L	<10 mEq/L
Mental status	Alert	Alert/drowsy	Stupor/coma

Differential Diagnosis

Any cause of elevated anion gap metabolic acidosis must be considered:

Alcoholic ketoacidosis - euglycemic or hypoglycemic; accounts for ~20% of all ketoacidosis cases
Starvation ketoacidosis - mild, non-hyperglycemic
Lactic acidosis (sepsis, ischemia)
Toxic ingestions: salicylates, ethylene glycol, methanol
Renal failure
Hyperosmolar Hyperglycemic State (HHS) - overlapping features but no significant ketonemia, pH >7.3

Important: The presence of DKA does not exclude a co-existing cause of anion gap acidosis. Use the delta gap (delta AG - delta HCO₃⁻): a delta gap >+6 indicates co-existing metabolic alkalosis; <-6 indicates co-existing hyperchloremic acidosis.

Tintinalli's Emergency Medicine, p. 3013-3035 | Rosen's Emergency Medicine, p. 3725-3729

Common Precipitants

Infection (most common - pneumonia, UTI)
Missed or inadequate insulin doses
New-onset Type 1 diabetes
Myocardial infarction
Emotional or physical stress
SGLT2 inhibitors (euglycemic DKA)
Pancreatitis, GI illness

Recent guidance note: A 2024 ADA consensus report on hyperglycemic crises (PMID 40032308, Cleveland Clinic J Med, 2025) was published updating the approach to DKA and HHS - consider reviewing it for any practice-level updates to the criteria above.

Secondary spontaneo pneumothorax in copd

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Secondary Spontaneous Pneumothorax (SSP) in COPD

Definition and Why It Matters

Secondary spontaneous pneumothorax (SSP) is pneumothorax occurring in the setting of underlying lung disease - as opposed to primary spontaneous pneumothorax (PSP) in a previously healthy lung. SSP is fundamentally more dangerous than PSP because the patient already has diminished pulmonary reserve, so even a small pneumothorax can be life-threatening and requires more immediate intervention.

Fishman's Pulmonary Diseases and Disorders, p. 2792

COPD as the Dominant Cause

COPD is the most common cause of SSP in the United Kingdom and Western countries (pulmonary tuberculosis remains the most common worldwide). In one large series of >500 SSP patients, COPD was the etiology in 69% of cases.

Key COPD-specific data from the VA Cooperative Study:

Pneumothorax typically occurs in moderately severe COPD (mean FEV1/FVC of 57%; one quarter had FEV1 <1 L)
35% of COPD patients with pneumothorax had a persistent air leak (bronchopleural fistula) for more than 5 days
SSP increases mortality of age-matched COPD patients 3.5-fold
Combined analysis of three papers showed 16% mortality for SSP
Fishman's Pulmonary Diseases and Disorders, p. 2812-2814

Pathophysiology

Smoking-related emphysema leads to:

Destruction of alveolar walls and formation of bullae and blebs
Air trapping with elevated distal airway pressures
Rupture of the visceral pleura as bullae enlarge and rupture
Air entering the pleural space, causing lung collapse

The already-compromised lung cannot tolerate even partial collapse without significant hemodynamic and respiratory deterioration.

Clinical Features

Symptoms (often more severe than in PSP for the same pneumothorax size):

Acute onset dyspnea - typically more prominent and distressing than in PSP because of reduced reserve
Ipsilateral pleuritic chest pain
Worsening of baseline respiratory symptoms

Signs:

Sinus tachycardia
Ipsilateral hyperresonance to percussion (tympany)
Diminished or absent breath sounds on the affected side
Decreased chest wall expansion ipsilaterally
Hypoxia (often prominent in COPD patients)

Important caveat: Signs can be subtle in emphysema because hyperinflation and bullous disease already alter baseline auscultation. A high index of suspicion is required.

Tension pneumothorax - suspect if: tracheal deviation, hemodynamic compromise (hypotension, tachycardia), worsening hypoxemia with contralateral mediastinal shift on imaging. This is a medical emergency - do not wait for imaging before decompressing.

Murray & Nadel's Respiratory Medicine, p. 78-80 | Rosen's Emergency Medicine, p. 4210-4213

Diagnosis

Imaging

Chest X-ray (CXR):

First-line imaging - shows visceral pleural line with absent lung markings distal to it
The pleural line has air on both sides, no lung markings distal, and is continuous
Critical pitfall in COPD: Bullae can mimic pneumothorax on CXR (both appear as lucent areas without lung markings). This is one of the most dangerous diagnostic errors in SSP

CT Chest:

Should have a low threshold for CT in COPD patients because:
- Bullae are easily mistaken for pneumothorax on plain film
- CT precisely delineates bullae from true pneumothorax
- Guides drainage site selection (avoids puncturing a bulla)
- Many physicians opt for CT to avoid doubt

Lung Ultrasound (POCUS):

Absence of lung sliding + absence of B-lines = pneumothorax with high sensitivity and specificity
Very useful at bedside, especially in unstable patients

Size measurement - two main systems:

Guideline	"Large" pneumothorax definition
BTS	>2 cm air rim at hilum level on erect CXR
ACCP	≥3 cm from apex to chest wall at thoracic cupola

Note: CT sizing is more accurate than plain film, especially in bullous disease.

Murray & Nadel's Respiratory Medicine, p. 83-140

Management

General Principles for SSP (differ from PSP)

All SSP patients should be admitted to hospital for at least 24 hours (unlike PSP, where stable patients can be observed in ED then discharged)
Supplemental oxygen is given to all (increases rate of pneumothorax absorption ~4-fold by reducing pleural nitrogen partial pressure)
The threshold to intervene is lower than in PSP due to poor baseline reserve
Persistent bronchopleural fistula is common - plan accordingly

Management by Size/Clinical Status

Scenario	Management
Small SSP (<1 cm), clinically stable	Admit + supplemental O₂ + 24h observation
Moderate SSP (1-2 cm), stable	Trial of needle aspiration (16-18G cannula, up to 2.5L)
Large SSP (>2 cm) OR failed aspiration	Chest tube (tube thoracostomy) - small bore preferred (8-14F pigtail catheter)
Respiratory distress / tension	Immediate decompression - do not delay for imaging
Hemothorax or large air leak	Larger bore tube (14-28F or >28F)

Re: needle aspiration in SSP: BTS guidelines recommend NA as initial treatment; however, SSP has a higher failure rate with observation/aspiration alone. The decision remains clinician-dependent. One RCT (Thelle et al.) found NA actually had higher initial success than chest tube in SSP (68.8% vs 31.8%), but this requires further validation.

Chest Tube Management

Connect to water seal device
Routine suction is not recommended - it does not improve outcomes
Suction (20 cmH₂O) is reserved for failure to re-expand after 24-48h on water seal
Monitor for air leak cessation before removal

Tension Pneumothorax Management

Needle decompression (temporizing): 14-16G IV catheter at 2nd ICS midclavicular line (or 4th/5th ICS midaxillary line), minimum 3-5 cm length
Followed immediately by tube thoracostomy for definitive management

Rosen's Emergency Medicine, p. 4301-4311 | Murray & Nadel's, p. 148 | Fishman's, p. 3507

Recurrence Prevention

SSP recurrence risk is 40-80% (higher than PSP's 28-30%), driven largely by the underlying irreversible lung disease.

COPD Patients: A Special Challenge

COPD patients are often unfit for surgery due to high anesthetic risk from severely reduced lung function. This creates a significant management dilemma:

Option	Details
VATS pleurodesis	Preferred if patient can tolerate surgery; lowest recurrence rate
Medical/chemical pleurodesis (talc via chest tube or thoracoscopy)	For patients unfit for VATS
Autologous blood patch pleurodesis	Instilled via chest tube; useful for ongoing air leak
Heimlich valve (flutter valve on chest tube)	Allows ambulatory management of persistent fistula; discharge possible in stable patients
Endobronchial valve insertion	Emerging option for persistent bronchopleural fistula when surgery is not possible
Definitive pleurodesis after first episode	Recommended in SSP (unlike PSP, where it's usually reserved for recurrence) given the high recurrence risk and life-threatening nature of recurrence in compromised lungs

Murray & Nadel's, p. 233-235 | Fishman's, p. 3507

Key Differences: SSP vs PSP at a Glance

Feature	SSP (COPD)	PSP
Age	Older (~60s-70s)	Younger (20-40s)
Background	Significant lung disease	Healthy lung
Typical size for symptoms	Even small = severe symptoms	Moderate-large for symptoms
Spontaneous resolution	Uncommon	More common
Bronchopleural fistula	Common (35%)	Rare
Mortality	~16%	<1%
Recurrence	40-80%	28-30%
Disposition	Always admit	Discharge if stable and small
Approach to surgery	Often unfit	VATS well tolerated

Recent literature note: A 2024 review on spontaneous pneumothorax management (PMID 39144356, J Thorac Dis) and a 2025 update (PMID 40374117, Clin Med) cover evolving evidence including the shift toward conservative management for PSP and needle aspiration as first-line for SSP - worth reviewing for the latest guideline interpretations.

Closed abdominal trauma

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Closed (Blunt) Abdominal Trauma

Overview

Blunt abdominal trauma (BAT) is one of the most challenging presentations in emergency and trauma surgery because physical findings are unreliable, injuries can be occult or delayed, and multiple organ systems are often simultaneously affected. The overall accuracy of physical examination alone is only 55-65% in blunt trauma patients. Up to 45% of patients thought to have a benign abdomen on initial exam are later found to have significant intra-abdominal injury.

The management has shifted decisively from DPL-based and operative-first approaches to CT-guided, nonoperative management as the dominant strategy at level 1 trauma centers.

Rosen's Emergency Medicine, p. 3613 | Current Surgical Therapy, p. 162

Mechanisms of Injury

Most common: Motor vehicle collision (MVC) - accounts for the majority of cases
Others: Falls (second most common), pedestrian-vs-vehicle, motorcycle crashes, bicycle handlebar injuries, assaults, blast injuries

Biomechanical forces involved:

Compression/crush: Force applied to anterior wall compresses viscera against posterior cage or vertebral column - especially damages solid organs (liver, spleen)
Shearing/deceleration: Rapid acceleration/deceleration disrupts organs at fixed points of attachment (e.g., liver at hepatic veins, bowel at ligament of Treitz)
Burst/hollow organ rupture: Sudden rise in intra-abdominal pressure ruptures hollow viscera

Seatbelt injuries: The lap-belt pattern compresses bowel between the belt and vertebral column, most commonly injuring the jejunum. The seatbelt sign (abrasion/contusion across the lower abdomen) is present in <1/3 of patients with lap-belt injuries but is highly correlated with intraperitoneal pathology. About 25% of seatbelt injury patients develop hemoperitoneum from mesenteric lacerations.

Rosen's Emergency Medicine, p. 3541-3546 | Tintinalli's EM, p. 791

Organs Most Commonly Injured

Organ	Notes
Spleen	Most often injured in blunt trauma; isolated in ~2/3 of cases
Liver	Second most common; right lobe most often affected
Small bowel/mesentery	Most common hollow viscus injured; up to 12% incidence
Pancreas	~4% incidence; significant morbidity; occurs with deceleration (handlebar, steering wheel)
Kidney	Retroperitoneal; often missed on FAST
Duodenum	Retroperitoneal; hematoma can cause delayed obstruction
Diaphragm	0.8-5%; left side more common; easily missed; delayed herniation is life-threatening
Bladder/urethra	Associated with pelvic fractures
Abdominal aorta	Rare but mortality 50-70%

Clinical Features

History:

Mechanism (MVC, speed, seatbelt use, airbag deployment, intrusion into cabin)
Prehospital vital signs and response to resuscitation
Comorbidities (coagulopathy, anticoagulant use, cirrhosis)
Pre-existing abdominal pathology (splenomegaly, infectious mononucleosis - risk of trivial-trauma spleen rupture)

Symptoms:

Abdominal pain (variable - may be absent initially, especially in retroperitoneal injuries)
Referred shoulder tip pain (diaphragmatic irritation - Kehr's sign for splenic injury)
Nausea, vomiting
Delayed development of ileus, distention

Physical Examination:

Inspect: Abrasions, contusions, lacerations, seatbelt marks, distention, evisceration
Palpate: Tenderness (local or generalized), guarding, rebound, rigidity - but these are unreliable in altered mental status
Special signs:
- Gray-Turner sign: Flank ecchymosis = retroperitoneal hemorrhage (delayed 12h to days)
- Cullen sign: Periumbilical ecchymosis = retroperitoneal hemorrhage (delayed)
- Seatbelt sign: High correlation with intraperitoneal injury
Bowel sounds are unreliable - do not use absence/presence to rule in/out injury
Serial exams are mandatory - injuries may unmask over hours

High-risk patients requiring expanded evaluation (Table 263-1):

Abdominal pain, tenderness, distention, or external signs of trauma
High-risk mechanism
Suspicious lower chest, back, or pelvic injury
Elderly, anticoagulated, cirrhotic patients
Distracting injuries
Altered consciousness
Tintinalli's EM, p. 810-813 | Rosen's EM, p. 3585-3613

Diagnostic Approach

Hemodynamic Status Drives Workup

Blunt Abdominal Trauma
        |
   Hemodynamically UNSTABLE?
       /           \
     YES            NO
      |              |
   e-FAST         CT Abdomen/Pelvis with IV contrast
      |              (Gold standard)
  Positive?
   /      \
  YES      NO
   |        |
Immediate  Consider DPL / serial exam /
Laparotomy   alternative source of instability

1. e-FAST (Extended Focused Assessment with Sonography in Trauma)

The cornerstone of initial trauma assessment. Performed during the primary survey simultaneously with resuscitation.

Views assessed:

Morison's pouch (hepatorenal space) - most dependent area
Splenorenal recess
Pouch of Douglas (pelvis)
Pericardial view (tamponade)
Bilateral thoracic views (hemothorax, pneumothorax)

Advantages: Rapid, noninvasive, portable, repeatable, no radiation, no contrast
Limitations:

Operator-dependent
Cannot identify the source of free fluid
Cannot evaluate the retroperitoneum well (misses pancreas, duodenum, kidney injuries)
Difficult in obese patients or with bowel gas
Cannot distinguish blood from ascites
NOT a rule-out test - a negative FAST does not exclude intra-abdominal injury

FAST has largely replaced DPL for initial triage of blunt abdominal trauma in most North American trauma centers.

2. CT Abdomen/Pelvis with IV Contrast

The gold standard for hemodynamically stable patients. PO contrast is NOT used (aspiration risk, time-consuming).

Advantages:

Precisely localizes and grades solid organ injuries
Evaluates the retroperitoneum (pancreas, duodenum, vessels, kidneys)
Identifies hollow viscus injuries (though sensitivity is limited)
Detects active extravasation (blush) indicating ongoing hemorrhage
Identifies pneumoperitoneum, pneumoretroperitoneum
Guides operative vs. nonoperative decision-making
Multiphasic CT (arterial, portal, equilibrium phases) improves detection of mesenteric hemorrhage and bowel injury

Pitfall: CT has limited sensitivity for hollow viscus (small bowel) injuries. If hollow viscus injury is suspected clinically but CT is equivocal, serial exams and repeat imaging are essential.

3. Diagnostic Peritoneal Lavage (DPL)

Now largely supplanted by FAST and CT. Still useful when:

FAST unavailable or equivocal
Concern for occult bowel injury
Hemodynamically unstable patient with negative FAST

Positive DPL criteria:

Finding	Significance
Aspiration >10 mL gross blood	Any visceral injury
RBC >100,000/mm³	Any visceral injury
WBC >500/mm³	Any visceral injury
Amylase >75 IU/L	Any visceral injury
Bacteria, bile, food particles	Bowel perforation

Pitfalls: High false-positive rate; misses retroperitoneal injuries; iatrogenic injury risk. Insert Foley catheter and NG tube before performing.

4. Laboratory Tests

Not diagnostic for specific injuries but useful adjuncts:

CBC, coagulation studies, type & crossmatch
Metabolic panel, lactate (markers of shock severity)
Liver enzymes (ALT/AST elevation suggests hepatic injury)
Lipase (pancreatic injury)
Urinalysis (gross or microscopic hematuria = genitourinary injury)
Pregnancy test in women of childbearing age
Alcohol/toxicology screen

5. Plain X-rays

Chest X-ray: Free air under diaphragm, rib fractures, hemothorax, pneumothorax, diaphragm rupture
Pelvis X-ray: Fractures (associated with massive retroperitoneal hemorrhage)
Limited role compared to CT but fast and available
Current Surgical Therapy, p. 162-200 | Tintinalli's EM, p. 885-901

Management

Immediate Priorities (ATLS Framework)

Primary survey (ABCDE) - airway, breathing, circulation, disability, exposure
Two large-bore IVs + aggressive fluid resuscitation (but permissive hypotension in penetrating trauma - target MAP 50-65)
e-FAST at transition from primary to secondary survey
Activate massive transfusion protocol if needed (1:1:1 ratio of pRBC:FFP:platelets)
Tranexamic acid (TXA): Give within 1 hour of injury if hemorrhagic shock suspected; benefit diminishes after 3 hours and may increase risk of death (CRASH-2 trial data)
Reverse anticoagulation: Warfarin/factor Xa inhibitors → prothrombin complex concentrate (PCC); Dabigatran → idarucizumab

Indications for Immediate Laparotomy (Blunt Trauma)

Indication	Pitfall
Refractory hypotension + positive e-FAST + no unstable pelvic fracture	Alternative sources of shock
Unequivocal peritonitis	Unreliable in altered mental status
Pneumoperitoneum on CXR or CT	Rare; can be from procedure (DPL, laparoscopy)
Evidence of diaphragmatic injury	Nonspecific, insensitive
Significant GI bleeding
CT-diagnosed injury requiring surgery
e-FAST positive + other life-threatening injuries (e.g., chest hemorrhage) requiring OR

Key principle: A patient with known hemoperitoneum and vital signs that cannot be stabilized must go to the OR - even with a concurrent closed head injury (abdominal hemorrhage takes operative precedence over head injury).

Nonoperative Management (NOM)

NOM has become the dominant approach for solid organ injuries in hemodynamically stable patients, enabled by CT grading and interventional radiology.

Success rate: 95% for blunt liver and spleen injuries in normal sensorium patients without peritonitis or hemodynamic compromise.

Requirements for NOM:

Hemodynamic stability
Normal or obtainable sensorium (NOM is unreliable in closed head injury, intoxication)
No peritoneal signs
Adequate institutional resources: trauma surgeons on call, experienced nursing, blood bank, IR capability, rapid OR access

Adjuncts to NOM:

Transcatheter angioembolization (TAE): For active contrast extravasation on CT (arterial "blush") from solid organ injuries - can reliably arrest hemorrhage
REBOA (Resuscitative Endovascular Balloon Occlusion of the Aorta): Available at Level 1 centers for unresponsive shock - intravascular aortic "clamping"

When NOM fails:

Hollow viscus injury (requires surgery - CT has limited sensitivity for this)
Hemorrhage not amenable to embolization
Lag time to OR increases morbidity - always have OR ready

Pelvic Fracture with Hemodynamic Instability

e-FAST positive → hemoperitoneum → laparotomy
e-FAST negative → retroperitoneal pelvic hematoma → early pelvic angiography + embolization
Early mechanical pelvic stabilization (pelvic binder) is key in all patients with pelvic fracture
CT followed by angiography/embolization as early as possible
Rosen's EM, p. 3842-3880 | Tintinalli's EM, p. 928-962

Specific Organ Injuries - Key Points

Organ	Key Points
Spleen	Most commonly injured. AAST grading I-V. NOM in stable patients; Grade III-V with blush → angioembolization; Grade V/unstable → splenectomy. Post-splenectomy: vaccinate for encapsulated organisms (S. pneumoniae, H. influenzae, N. meningitidis)
Liver	Second most common. Grades I-VI. Majority managed nonoperatively. Active bleeding → embolization or OR. Delayed complications: biloma, hepatic artery pseudoaneurysm
Pancreas	Low incidence (4%) but high morbidity. Often missed early. Transection at body (handlebar/steering wheel). MRCP or ERCP to assess ductal integrity. Distal pancreatectomy for main duct injuries
Duodenum	Retroperitoneal; hematoma causes delayed obstruction. High-velocity deceleration. Look for "sentinel clot" sign on CT near the duodenum
Hollow viscus	Requires surgery. CT has poor sensitivity. Clinical clue: worsening pain, fever, leukocytosis after initial period of stability. Free fluid without solid organ injury on CT is suspicious
Diaphragm	CT sensitivity as low as 60%; left > right (liver protects). Delayed herniation with strangulation has 50% mortality. Repair required when diagnosed
Bladder	Almost always associated with pelvic fracture. Gross hematuria → CT cystogram. Intraperitoneal rupture → surgical repair; extraperitoneal → catheter drainage

Disposition

Significant intra-abdominal injury: Admit to surgery/trauma service
Minor injury: Consider admission for observation even if injury is minor due to high rate of concomitant injuries
Discharge instructions (if discharged): Return for fever, vomiting, worsening pain, dizziness, weakness - these suggest delayed hollow viscus injury, ongoing hemorrhage, or sepsis

Recent evidence note:

A 2026 consensus on NOM of pediatric solid organ injuries after blunt trauma (PMID 41550051) reinforces the nonoperative approach even for high-grade injuries in children.
A 2026 systematic review on pneumoperitoneum without bowel perforation in blunt trauma (PMID 41622202) highlights that free air on CT does not always mandate immediate laparotomy - clinical correlation is essential.

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