01Approach to the Critical Patient/attcp48

Immediate priorities

›Strangulation recognition

›Tense, exquisitely tender, non-reducible groin mass

›Hallmark sign of strangulation requiring immediate surgery

›Do NOT attempt manual reduction if strangulation suspected

›Sepsis physiology

›Fever, tachycardia, hypotension, altered mental status

›Broad-spectrum antibiotics within 1 hour if septic shock

›Peritoneal signs

›Rebound tenderness, guarding, rigidity

›Immediate surgical consultation without delay for imaging

›Airway and resuscitation

›IV access x2, aggressive crystalloid resuscitation

›Third-spacing from bowel obstruction

›Vomiting-induced hypovolemia

›NPO immediately upon presentation

›Anticipate surgical intervention

›NG tube if bowel obstruction with vomiting

›Foley catheter for bladder decompression

›Bladder may be herniated content

›Monitor urine output as resuscitation marker

Key decision point: incarceration vs strangulation

›Non-strangulated incarceration criteria

›Symptoms less than 24 hours duration

›Less than 6 hours strongly associated with lower bowel resection rates (OR 0.1)

›Manual reduction (taxis) may be attempted if no strangulation signs

›No peritoneal signs, no skin changes, no sepsis

›Taxis success rate approximately 70%

02History/hx48

Symptom onset and characterization

›Onset and timing

›Sudden onset painful irreducible groin lump

›Exact time of onset critical for surgical decision-making

›Less than 6 hours from onset associated with significantly lower bowel resection rates

›Constant versus colicky pain

›Radiation to scrotum, labia, or abdomen

›Severity and progression over time

›Prior hernia history

›Known inguinal hernia previously reducible

›When did it become irreducible

›Prior repair: type and mesh use

›Prior attempts at self-reduction

›Risk of reduction en masse

Obstructive symptoms

›Bowel obstruction features

›Nausea and vomiting

›Bilious vomiting suggests distal obstruction

›Obstipation and absence of flatus

›Abdominal distension

›Rapidly progressive distension with complete obstipation

›Last bowel movement timing

›Alarm features

›Fever and chills suggesting strangulation or perforation

›Bloody stool or vomit suggesting bowel ischemia

›Confusion or altered mental status suggesting sepsis

Risk factors

›Predisposing conditions

03Physical Exam/exam46

Vital signs and general appearance

›Hemodynamic stability assessment

›Tachycardia greater than 100 bpm

›Hypovolemia, sepsis, or pain response

›Hypotension SBP less than 90 mmHg suggesting strangulation or sepsis

›Fever greater than 38 C

›Concerning for necrosis or perforation

›Hypothermia as severe sepsis marker

›General appearance

›Diaphoresis, pallor, or toxic appearance

›Strangulation until proven otherwise

›Pain severity out of proportion to exam

Groin and hernia examination

›Inspection

›Visible tense non-reducible mass in groin

›Location above inguinal ligament (inguinal) vs below (femoral)

›Skin changes: erythema, ecchymosis, necrosis — OR 3.3 for bowel ischemia

›Cough impulse absent in incarcerated hernia

›Positive cough impulse suggests reducible hernia

›Compare to contralateral side

›Palpation

›Tenderness, warmth, firmness of hernia

›Attempt gentle reduction only if no signs of strangulation

›Tense and woody consistency suggests strangulated bowel

›Can you get above the mass

›Unable to get above: inguinoscrotal extension

›Scrotal exam: differentiate from hydrocele (transilluminates), testicular torsion

04Differential Diagnosis/ddx41

Life-threatening conditions

›Strangulated hernia variants

›Strangulated femoral hernia (ICD-10 K41.3)

›More common in women

›Located below and medial to inguinal ligament

›Richter hernia

›Partial bowel wall incarceration without complete obstruction

›ICD-10 K46.0

›Obturator hernia

›Rare; presents with bowel obstruction and medial thigh pain

›Howship-Romberg sign: medial thigh pain with hip extension

›Abdominal emergencies

›Small bowel obstruction with strangulation (ICD-10 K56.2)

›Closed-loop obstruction may not have external hernia visible

›CT required for diagnosis

›Sepsis from bowel perforation (ICD-10 A41.9)

›Free air on imaging

›Peritonitis on exam

Groin and scrotal mimics

›Vascular and lymphatic causes

›Inguinal lymphadenopathy

›Multiple nodes, non-reducible, no cough impulse

›Infection, malignancy workup required

›Femoral artery pseudoaneurysm

›Pulsatile mass

›Post-catheterization history

›Testicular and scrotal pathology

›Testicular torsion (ICD-10 N44.0)

05Laboratory Tests/lt37

Core laboratories

›Hematologic and inflammatory markers

›Complete blood count

›Leukocytosis suggesting strangulation or perforation

›Neutrophil-to-lymphocyte ratio greater than 6.5 predicts bowel resection

›C-reactive protein

›Elevated CRP independent risk factor for progression to strangulation

›Part of predictive nomogram for strangulation risk (AUC 0.906)

›Metabolic panel

›Electrolytes and renal function

›Hyponatremia (Na less than 135 mmol/l): OR 3.9 for bowel ischemia

›BUN and creatinine for dehydration assessment from vomiting

›Bicarbonate and anion gap

›Metabolic acidosis suggesting bowel ischemia

›Elevated glucose as stress response marker

Perfusion and ischemia markers

›Lactate

›Lactate 1.46 mmol/l or greater predictive of bowel resection

›Normal lactate does NOT exclude strangulation

›Repeat in 2-4 hours if initially normal and clinical concern persists

›Rising lactate despite resuscitation

›Escalation trigger for urgent surgical intervention

›ICU-level monitoring

›Prealbumin and nutrition

›Low prealbumin associated with worse postoperative outcomes

›Elevated prealbumin is protective

›Relevant for surgical risk stratification

06Diagnostic Tests/dt67

Scoring Systems

›Strangulation risk predictors

›Predictive nomogram for strangulation (AUC 0.906)

›Components: inguinal tenderness + intestinal obstruction + elevated CRP + elevated neutrophils

›High combined score mandates urgent surgical intervention

›Individual risk markers

›Duration greater than 24 hours: markedly increased strangulation risk

›Skin changes over hernia: OR 3.3 for bowel ischemia

›Bowel ischemia prediction score components

›Hyponatremia (Na less than 135 mmol/l): OR 3.9

›Neutrophil-to-lymphocyte ratio greater than 6.5 predicts bowel resection

›ASA classification

›Preoperative risk stratification

›ASA class independent predictor of morbidity in emergency hernia repair

›ASA III-IV: higher complication rates, ICU postoperative planning

MRI

›Indications for MRI

›Rarely used in the acute setting

›CT preferred for speed and availability in emergencies

›Consider if CT contrast contraindicated and diagnosis uncertain

›Potential roles

›Soft tissue characterization of hernia contents

›Assessment of bowel viability in select cases

›Differentiation of groin masses when ultrasound and CT inconclusive

›MRI hernia protocol

›T2-weighted sequences for bowel wall edema

›Diffusion-weighted imaging for ischemia detection

›Dynamic sequences for reducibility assessment

07Disposition/dispo32

Immediate surgical consultation

›Consultation triggers

›All patients with incarcerated inguinal hernia

›Do not delay consultation for imaging if clinical diagnosis is clear

›HerniaSurge guideline recommendation

›Immediate OR activation for strangulation

›Peritoneal signs, sepsis, skin changes

›Surgical intervention within 1-2 hours of diagnosis

Admission criteria

›All patients requiring surgical intervention

›Strangulated hernia or suspected bowel ischemia

›Bowel resection anticipated

›Hemodynamic instability

›Failed manual reduction

›Operative repair required

›Postoperative ICU if bowel resection performed

›Successful manual reduction with concerning features

›Prolonged incarceration greater than 12-24 hours

›Borderline labs or elevated inflammatory markers

›Observe several hours for delayed peritonitis from reduced ischemic bowel

Observation criteria

›Post-reduction observation

›Hemodynamically stable after successful taxis

›Minimum 4-6 hours observation for signs of peritonitis

›Reduced ischemic bowel may perforate hours after reduction

›Serial abdominal exams during observation

›Any peritoneal signs trigger immediate surgical consultation

›Arrange urgent semi-elective surgical repair within same admission or within weeks

08Treatment/t78

Initial stabilization

›Resuscitation

›IV crystalloid resuscitation

›Normal saline or lactated Ringer 500 mL bolus

›Reassess after each bolus; goal SBP greater than 90 mmHg and urine output greater than 0.5 mL/kg/hr

›NG tube insertion if vomiting or bowel obstruction

›Low intermittent suction for decompression

›NPO strict

›Analgesia

›Morphine IV 2-4 mg every 4-6 hours as needed

›Adequate analgesia does not mask peritoneal signs and is appropriate

›Avoid NSAIDs if suspected bowel ischemia or renal compromise

›Antiemetics

›Ondansetron IV 4 mg every 6 hours as needed

›Metoclopramide IV 10 mg if ondansetron insufficient

Manual reduction (taxis)

›Eligibility criteria for taxis

›Symptoms less than 24 hours

›No peritoneal signs, no skin changes over hernia, no sepsis

›Patient able to cooperate

›Contraindications

›Any sign of strangulation

›Peritoneal signs or septic physiology

›Taxis technique

›Patient positioning

›Trendelenburg position (15-30 degrees head down)

›Hip flexion to relax inguinal ligament

›Sedation and analgesia protocol

›Morphine IV 0.1 mg/kg (typical 4-8 mg)

›Allow 10-15 minutes for peak effect

›Midazolam IV 1-2 mg for muscle relaxation and anxiolysis

›Adequate sedation critical for success

›Reduction maneuver

›Sustained gentle pressure on hernia with one hand

›Guide contents through the ring with the other hand

›Success rate approximately 70%

›Post-reduction monitoring

›Immediate CT or observation for peritonitis

›If hernia reduces under anesthesia in OR: diagnostic laparoscopy required to assess bowel viability (WSES Grade 2B)

Antibiotic therapy

›Strangulation or perforation suspected

›Piperacillin-tazobactam IV 3.375 g every 6 hours

›Covers gram-negative enteric organisms and anaerobes

›Initiate within 1 hour of septic shock diagnosis

›Alternative if penicillin allergy

›Ciprofloxacin IV 400 mg every 12 hours plus metronidazole IV 500 mg every 8 hours

›Adjust for renal function

›Uncomplicated hernia repair

›No evidence supports routine postoperative antibiotics for uncomplicated repair

›Single preoperative dose of cefazolin 1-2 g IV within 60 minutes of incision

›Contaminated or dirty wound: continue postoperative antibiotics per surgical team

Surgical management

›Timing of surgery

›Early intervention less than 6 hours from onset

›OR 0.1 for bowel resection compared to delayed surgery

›Immediate OR for strangulation regardless of duration

›Open repair

›Preferred if strangulation with bowel resection anticipated

›Contaminated or dirty field from perforation

›Limited laparoscopic expertise available

›Laparoscopic repair (TAPP or TEP)

›Conditionally recommended over open (lower recurrence, shorter LOS) when expertise available (EAST guidelines 2025)

›TAPP: Transabdominal preperitoneal approach

›TEP: Total extraperitoneal approach

›Mesh vs primary tissue repair

›Mesh repair conditionally recommended in clean or clean-contaminated fields

›Lower recurrence rate (OR 0.34 vs primary tissue repair)

›Cochrane 2023 systematic review supports mesh use in emergency repair

›Avoid mesh in contaminated or dirty fields

›Primary tissue repair (Bassini, Shouldice technique) if gross contamination

›Biologic mesh may be considered in contaminated fields

›Bowel viability assessment

›If bowel appears ischemic intraoperatively

›Warm saline irrigation and 5-10 minutes observation for color and peristalsis return

›If no recovery: bowel resection with primary anastomosis

›Hernioscopy or diagnostic laparoscopy if hernia reduces spontaneously under anesthesia

›WSES Grade 2B recommendation

›Assess viability before proceeding to repair

›Mesh fixation

›Penetrating vs non-penetrating fixation

›Cochrane 2026 systematic review: no significant difference in outcomes

›Non-penetrating (glue, self-gripping) reduces chronic pain risk

09Special Populations/sp62

Pregnancy

›Incarcerated hernia in pregnancy

›Rare but serious; incidence increases in third trimester due to uterine pressure

›Diagnostic challenge: enlarged uterus may mimic or mask groin mass

›CT with IV contrast acceptable if clinical uncertainty and strangulation suspected (benefit outweighs radiation risk)

›Management principles

›Manual reduction preferred if no strangulation signs

›Surgical repair: general surgery and obstetrics co-management

›Regional anesthesia preferred over general to minimize fetal risk

›Medication considerations

›Morphine: Category C, use cautious doses, monitor neonatal respiratory depression if near term

›Midazolam: Avoid near term (neonatal withdrawal), consider alternatives

›Metronidazole: Avoid in first trimester; use with caution if anaerobic coverage required

›Fetal monitoring

›Continuous fetal monitoring during and after any procedure

›Obstetrics team involvement for gestational age greater than 24 weeks

Geriatric

›Age-related considerations

›Peak hernia incidence at 75-80 years

›Higher ASA class: increased morbidity with emergency versus elective repair

›Emergency repair mortality higher than elective (approximately 4% vs 0.2%)

›Atypical presentations

›Fever may be absent despite strangulation

›Leukocytosis may be blunted

›Confusion or altered mental status may be presenting feature of sepsis

›Medication dosing adjustments

›Morphine: reduce dose to 1-2 mg IV in frail elderly, reduce frequency

›Increased sensitivity to opioids and benzodiazepines

10Background/b61

Epidemiology

›Prevalence and incidence

›Inguinal hernias affect approximately 27% of men lifetime (vs 3% in women)

›Most common hernia type requiring surgical repair

›Approximately 5% of inguinal hernias present acutely with incarceration

›Strangulation and emergency repair statistics

›Emergency hernia repair carries approximately 4% mortality

›22% of incarcerated hernias require bowel resection

›Mortality for elective repair approximately 0.2%

›Demographics

›Peak hernia repairs in men aged 75-80 years

›37% of femoral hernias present acutely with incarceration

›Femoral hernias more common and higher risk in women

›Watchful waiting outcomes

›12-year RCT: accumulative incarceration rate low in mildly symptomatic men over 50 on watchful waiting

›Acute presentation risk increases over time without repair

Pathophysiology

›Hernia formation

›Indirect inguinal hernia

›Peritoneal sac passes through deep inguinal ring

›Patent processus vaginalis in neonates and children

›Most common type in all age groups

›Direct inguinal hernia

›Protrudes through Hesselbach triangle (posterior inguinal wall weakness)

›Acquired; associated with aging and increased intra-abdominal pressure

›Femoral hernia

›Protrudes through femoral ring below inguinal ligament

›High strangulation risk (37% present acutely)

11Patient Discharge Instructions/pdi27

copy discharge instructions

›You were treated for an inguinal hernia (a bulge in your groin) that became stuck and could not be pushed back in

›Your hernia was successfully pushed back into place (reduced) in the emergency department

›You must follow up with a surgeon within 1-2 weeks to arrange repair

›This hernia will likely get stuck again without surgical repair

›Activity instructions

›Avoid heavy lifting (greater than 5-10 kg), straining, and vigorous exercise until you see your surgeon

›Light activity and walking are permitted

›Diet and bowel care

›High-fiber diet and plenty of fluids to prevent constipation

›Avoid straining during bowel movements

›Over-the-counter stool softeners (docusate sodium 100 mg twice daily) if needed

›Pain management

›Acetaminophen 500-1000 mg every 6 hours as needed for groin discomfort

›Ibuprofen 400 mg every 6-8 hours with food if no contraindications

›Return to the emergency department immediately for

›A lump reappearing in your groin that cannot be pushed back in

›This is a surgical emergency — do not wait

›Call emergency services or go to the nearest ED immediately

›Severe or worsening groin or abdominal pain

›Nausea, vomiting, or inability to pass gas or have a bowel movement

›Abdominal swelling or bloating

›Fever greater than 38.5 C or chills

›Redness, warmth, or discoloration of the skin over the groin bulge

›Signs of infection at any wound site if you had surgery

›Any concerning change in your condition

›Trust your instincts — if something feels wrong, seek immediate care

›Emergency hernia repair is more dangerous than planned surgery: do not delay seeking care

12References/r37

Guidelines and key sources

›Farrell MS, Zhang Z, Kirsch J, et al. Surgical Management of Incarcerated and Strangulated Inguinal Hernias Requiring Urgent Surgical Intervention

›Eastern Association for the Surgery of Trauma (EAST) systematic review and practice management guideline

›Journal of Trauma and Acute Care Surgery 2025

›PMID 40671180

›Sæter AH, Fonnes S, Li S, Rosenberg J, Andresen K. Mesh Versus Non-Mesh for Emergency Groin Hernia Repair

›Cochrane Database of Systematic Reviews 2023

›Conditionally recommends mesh in clean/clean-contaminated fields; OR 0.34 for recurrence

›Cochrane Library DOI 10.1002/14651858.CD015160.pub2

›Fitzgibbons RJ, Forse RA. Groin Hernias in Adults

›New England Journal of Medicine 2015

›Comprehensive review; HerniaSurge imaging and management guidelines cited

›NEJM DOI 10.1056/NEJMcp1404068

›Sermonesi G, Tian BWCA, Vallicelli C, et al. Cesena Guidelines: WSES Consensus Statement on Laparoscopic-First Approach

›World Journal of Emergency Surgery 2023

›WSES Grade 2B: diagnostic laparoscopy after spontaneous reduction of strangulated hernia

›PMC10704840

Supporting literature

›Keeley JA, Kaji A, Kim DY, Putnam B, Neville A. Predictors of Ischemic Bowel in Patients With Incarcerated Hernias

›Hernia: The Journal of Hernias and Abdominal Wall Surgery 2019

›Hyponatremia OR 3.9; skin changes OR 3.3; lactate predictive threshold identified

›PMID 30689076

›Pawlak M, East B, de Beaux AC. Algorithm for Management of an Incarcerated Inguinal Hernia in the Emergency Settings With Manual Reduction

›Hernia 2021; taxis technique, safety, and contraindications

›PMID 34036484

›Chen N, Lv M, Chen Y, et al. Investigation of Risk Factors and Predictive Model Development for Progression of Incarcerated Inguinal Hernia to Strangulation

›Hernia 2025; predictive nomogram AUC 0.906

›PMID 41105324

Evidence & Review

Evidence & Review