01Approach to the Critical Patient/attcp47

Immediate priorities

›Hemorrhagic shock recognition

›Tachycardia with painless lower GI bleeding

›HR > 100 in a child or young adult is significant

›Hemodynamic compromise from Meckel bleeding can be rapid

›Hypotension (SBP < 90 mmHg) with ongoing hematochezia

›MAP < 65 mmHg requires emergent resuscitation

›Pallor and diaphoresis with brick-red rectal bleeding

›Massive transfusion protocol activation threshold

›Two large-bore IV lines and crossmatch immediately

›pRBCs transfusion if Hgb < 70 g/L or hemodynamic instability

›Obstruction and peritonitis recognition

›Bilious vomiting with distension

›Suggests obstruction, volvulus, or intussusception

›Immediate surgical consultation

›Peritoneal signs indicating perforation

›Guarding, rigidity, rebound tenderness

›Free air on plain film or CT confirms perforation

›Absent bowel sounds with abdominal distension

›Complete obstruction pattern

›NPO, NG decompression, urgent surgery

Monitoring and targets

›Hemodynamic monitoring

›Continuous cardiac monitoring

›Tachycardia as hemorrhage severity marker

›Escalating HR trend indicates ongoing loss

›Serial blood pressure every 15 minutes in active bleeding

›SBP target >= 90 mmHg during resuscitation

02History/hx75

Presenting symptoms

›Classic bleeding presentation

›Painless rectal bleeding

›Brick-red or maroon colored stool

›Typically not melena

›Stool volume and frequency

›High-volume acute episodes more typical than chronic low-grade

›Duration < 6 days associated with higher likelihood of Meckel origin

›Prior similar bleeding episodes

›Recurrent painless lower GI bleeding in a child is Meckel until proven otherwise

›Prior workups and results

›Obstruction and inflammatory presentation

›Colicky abdominal pain

›Periumbilical or diffuse cramping suggests obstruction or intussusception

›RLQ pain mimicking appendicitis suggests Meckel diverticulitis

›Vomiting character

›Bilious vomiting indicates obstruction or volvulus

›Non-bilious vomiting less specific

›Constipation or obstipation

›Failure to pass stool or flatus

›Abdominal distension timeline

Risk factors

›Demographic risk factors for symptomatic presentation

›Age < 50 years (OR 3.5 for symptomatic MD)

›Children under 2 most likely to present with bleeding

›Over 50% of bleeding episodes present before age 2

›Male sex (OR 1.8; M:F ratio up to 3-4:1 for symptomatic cases)

›Male predominance applies to all complications

›Female patients less likely to be symptomatic

›Diverticulum length > 2 cm (OR 2.2)

›Associated with higher complication risk

›Not assessable clinically prior to imaging

›Tissue-related risk

›Ectopic gastric mucosa presence (OR 13.9)

›Present in 24-71% of symptomatic Meckel diverticula

›Acid secretion causes ulceration and bleeding

›Detected by Meckel scan (Tc-99m pertechnetate)

›Ectopic pancreatic tissue

›Less common but can cause inflammation

›Not detectable by Meckel scan (no gastric mucosa)

Red flag symptoms

›Alarm features requiring immediate escalation

›Massive painless lower GI bleeding in child or young adult

›Meckel diverticulum until proven otherwise

›Do not delay surgical consultation for outpatient workup

›Bilious vomiting at any age

›In neonates, malrotation with volvulus must be excluded first

›Surgical emergency until proven otherwise

›Currant jelly stools

›Suggests intussusception with Meckel as lead point

›Target sign on ultrasound confirms

›Hemodynamic instability with abdominal pain

›Perforation or volvulus with ischemia

›Immediate surgical team involvement

Associated symptoms and review of systems

›Constitutional symptoms

›Pallor, fatigue, dizziness

›Reflect degree of anemia from blood loss

›Syncope or near-syncope indicates significant hemorrhage

›Fever

›Suggests diverticulitis, perforation, or secondary peritonitis

›Not present with uncomplicated bleeding

›Umbilical symptoms

›Umbilical discharge or drainage

›Persistent omphalomesenteric duct remnant

›Umbilical granuloma or fistula

›Umbilical anomalies at birth

›History of umbilical cord abnormality

›May indicate incomplete duct obliteration

Past medical history

›Relevant prior history

›Previous unexplained GI bleeding or iron-deficiency anemia

›Recurrent transfusion-requiring episodes

›Prior endoscopic workups without source identified

›Prior abdominal surgeries

›MD may have been identified incidentally

›Adhesive bands from prior surgery can contribute to obstruction

›History of intussusception

›MD serves as pathologic lead point in older children

›Recurrent intussusception beyond infancy warrants Meckel evaluation

03Physical Exam/exam54

Vital signs

›Hemodynamic stability assessment

›Heart rate

›Tachycardia > 100 bpm indicates significant hemorrhage

›Compensatory tachycardia may persist despite fluid resuscitation

›Blood pressure

›Hypotension SBP < 90 mmHg indicates decompensated hemorrhagic shock

›Orthostatic changes suggest significant volume depletion

›Temperature

›Fever suggests diverticulitis, perforation, or peritonitis

›Afebrile with bleeding is typical uncomplicated Meckel pattern

›Respiratory rate

›Tachypnea from pain or anemia-related compensation

›Elevated RR in peritonitis

Abdominal exam

›Abdominal findings

›Distension

›Suggests obstruction, ileus, or ascites from perforation

›Significant distension warrants urgent imaging

›Tenderness location

›Diffuse tenderness with peritoneal signs suggests perforation

›RLQ focal tenderness mimics appendicitis (Meckel diverticulitis)

›Periumbilical crampy tenderness with intussusception

›Peritoneal signs

›Guarding, rigidity, rebound tenderness indicate surgical emergency

›Involuntary guarding is the most concerning finding

›Auscultation

›High-pitched bowel sounds in obstruction

04Differential Diagnosis/ddx47

Life-threatening mimics

›Surgical emergencies requiring exclusion first

›Malrotation with midgut volvulus (ICD-10 Q43.3)

›Bilious vomiting in neonate or infant

›Upper GI series confirms malrotation

›Intussusception (ICD-10 K56.1)

›Target sign on ultrasound

›Currant jelly stools

›Meckel diverticulum is the most common pathologic lead point beyond infancy

›Appendicitis (ICD-10 K37)

›Most common misdiagnosis for Meckel diverticulitis

›RLQ pain, fever, leukocytosis clinically indistinguishable

›Perforated viscus (ICD-10 K63.1)

›Free air on plain film or CT

›Peritoneal signs on exam

Lower GI bleeding differential

›Pediatric lower GI bleeding causes

›Juvenile inflammatory polyps (ICD-10 K51.50)

›Painless small volume rectal bleeding

›Colonoscopy diagnostic

›Allergic proctocolitis (ICD-10 K52.9)

›Infants with cow milk protein sensitivity

›Bloody mucoid stools, eosinophilia

›Anal fissure (ICD-10 K60.0)

›Bright red blood on surface of stool

›Painful defecation

›Visible on perineal exam

›Henoch-Schonlein purpura (ICD-10 D69.0)

05Laboratory Tests/lt51

Hemorrhage and resuscitation labs

›Complete blood count

›Hemoglobin and hematocrit

›Hgb < 70 g/L is a strong predictor of bleeding Meckel in children (OR 6)

›Significantly lower Hgb in Meckel patients versus non-Meckel lower GI bleeding

›Platelet count

›Thrombocytopenia can exacerbate bleeding

›Platelet transfusion threshold < 50 x 10^9/L with active hemorrhage

›Type and screen or crossmatch

›Crossmatch if transfusion anticipated

›O-negative pRBCs for emergent transfusion prior to crossmatch

›Coagulation panel

›PT/INR and aPTT

›Coagulopathy can be primary or secondary cause of bleeding

›Disseminated intravascular coagulation if severe shock

›Fibrinogen

›Consumption coagulopathy marker

›Cryoprecipitate if < 1.5 g/L with active bleeding

Metabolic and organ function labs

›Basic metabolic panel

›Electrolytes

›Hyponatremia and hypokalemia from vomiting

›Dehydration correction targets

›Renal function (creatinine and urea)

›Prerenal azotemia from blood loss or dehydration

›Elevated urea with upper GI blood degradation

›Glucose

›Hypoglycemia risk in infants during fasting

06Diagnostic Tests/dt89

Scoring Systems

›Clinical Diagnostic Predictive Score for Meckel Diverticulum

›Scoring parameters (Jaramillo et al., Journal of Pediatric Surgery 2021)

›Infant or toddler age group

›Symptom duration < 6 days

›Large blood volume per episode

›Hemoglobin < 70 g/L

›Transfusion requirement

›Score interpretation

›Score >= 6 is highly suggestive of Meckel diverticulum

›Score >= 6 may justify direct surgical exploration without further imaging

›Validated in pediatric populations

›Rule of 2s mnemonic (teaching aide, not a clinical scoring tool)

›Approximately 2% prevalence in general population

›2 feet proximal to ileocecal valve on antimesenteric border

›Typically 2 inches in length

›2 types of ectopic tissue (gastric and pancreatic)

›2:1 male predominance for symptomatic cases

›Most symptomatic before age 2

MRI

›MRI abdomen and pelvis role in Meckel evaluation

›MRI enterography indications

›Problem-solving when CT and Meckel scan are inconclusive

›Avoids ionizing radiation in pediatric patients for chronic workup

›MRI findings in Meckel diverticulum

›True diverticulum with all bowel wall layers

›T2 bright fluid-filled structure in right lower quadrant

›Ectopic gastric mucosa may show diffusion restriction

›Limitations in acute hemorrhage

›Motion artifact from bowel peristalsis reduces diagnostic quality

›Not first-line in hemodynamically unstable patients

›Availability and time constraints in emergency setting

CT

›CT abdomen and pelvis indications

›Obstruction, diverticulitis, or perforation suspected

›Free air confirms perforation requiring emergent surgery

›Transition point for small bowel obstruction identification

›Thickened diverticulum with surrounding fat stranding in Meckel diverticulitis

›CT findings for complicated Meckel diverticulum

›Blind-ending fluid-filled structure on antimesenteric border of terminal ileum

›Ectopic gastric or heterotopic tissue may show enhancement

›Intussusception with fat-containing lead point

›CT limitations for uncomplicated bleeding Meckel

›Sensitivity poor for uncomplicated bleeding MD (no anatomic distortion)

›CT enterography improves detection sensitivity in stable patients

›Active extravasation on CT angiography (CTA) indicates rapid bleeding

›CT angiography for active hemorrhage localization

›CTA abdomen and pelvis

›Detects active bleeding rate > 0.5 ml/min

›Guides interventional radiology embolization or surgical target

›Sensitivity 79-97% for active GI hemorrhage

›Protocol considerations

›Three-phase: non-contrast, arterial, portal venous

›Contrast nephropathy risk assessment

›Pediatric radiation dose optimization

Ultrasound

›Abdominal ultrasound first-line role

›Intussusception identification

›Target sign (donut sign): alternating echogenic and hypoechoic rings

›Sensitivity 98-100% for intussusception in experienced hands

›Meckel diverticulum as lead point may be visible as echogenic fat

›Inflamed Meckel diverticulum

›Blind-ending non-compressible tubular structure

›Increased vascularity on Doppler

›Adjacent free fluid in complicated cases

›Free fluid detection

›Peritoneal fluid in perforation

›Morison pouch and pelvic free fluid

›Tc-99m pertechnetate scintigraphy (Meckel scan)

›Mechanism and indication

›Tc-99m pertechnetate selectively taken up by gastric mucosa

›First-line imaging for suspected bleeding Meckel diverticulum

›SNMMI and EANM Practice Guideline 2.0 supports use

›Performance characteristics in children

›Sensitivity 80-95%, specificity 95-100% in pediatric patients

›Simultaneous uptake in stomach and ectopic focus in right lower quadrant

›Best performed fasted for 4-6 hours to reduce background activity

›Performance in adults

›Sensitivity only 62-88% in adults; significantly less reliable

›Lower ectopic gastric mucosa proportion in adult symptomatic MD

›Consider alternative modalities in adults with negative scan

›Pretreatment to enhance sensitivity

›H2-receptor antagonist pretreatment (ranitidine 1 mg/kg IV)

›Reduces gastric mucosa washout of tracer; improves sensitivity

›Pentagastrin stimulation as alternative (not routinely used)

›False negatives

›Ectopic pancreatic tissue without gastric mucosa (no uptake)

›Rapid active hemorrhage washing out tracer

›Small ectopic foci below scan resolution

›False positives

›Intussusception, duplication cysts, inflammatory lesions

›Urinary tract tracer retention mimicking ectopic focus

›Anatomic variants

07Disposition/dispo44

Admission indications

›All symptomatic Meckel diverticulum patients require admission

›Active GI bleeding

›Any ongoing rectal bleeding requires monitoring for hemodynamic change

›Transfusion requirement mandates inpatient setting

›Hemodynamic instability

›HR > 100 with hemorrhage or SBP < 90 mmHg

›ICU-level care for shock requiring vasopressors or active resuscitation

›Obstruction, diverticulitis, or perforation

›NPO, IV fluids, surgical consultation

›Bowel rest and antibiotics for diverticulitis without perforation

›Surgical intervention planned

›Pre-operative workup and monitoring required

›Pediatric surgical or general surgical team coordinating care

Level of care determination

›ICU admission criteria

›Hemorrhagic shock requiring vasopressors

›Norepinephrine if refractory hypotension despite pRBC transfusion

›Massive transfusion protocol activation

›Post-operative monitoring after complex resection

›Bowel anastomosis leak risk monitoring

›Sepsis from peritonitis requiring organ support

›Surgical floor admission

›Stable bleeding awaiting Meckel scan result

›Serial hemoglobin every 4-6 hours

›Serial abdominal exams

›Meckel diverticulitis without perforation

›IV antibiotics and bowel rest

08Treatment/t70

Initial resuscitation

›Hemorrhage resuscitation

›IV access

›Two large-bore peripheral IVs (18G or larger)

›Intraosseous access in pediatric patients if IV access fails

›Fluid resuscitation

›Isotonic crystalloid bolus 20 ml/kg in children, 500-1000 ml in adults

›Avoid over-resuscitation with crystalloid; shift to blood products early

›Blood product transfusion

›pRBCs transfuse if Hgb < 70 g/L or hemodynamic instability

›Target Hgb >= 70-80 g/L post-transfusion

›Fresh frozen plasma if coagulopathy (INR > 1.5)

›Platelets if < 50 x 10^9/L with active bleeding

›Supportive measures

›NPO if surgical intervention anticipated or obstruction suspected

›Nasogastric tube if vomiting or obstruction

›IV maintenance fluids at appropriate rate for age and weight

›Analgesia

›IV morphine 0.1 mg/kg in children (max 5 mg per dose) for severe pain

›Does not mask peritoneal signs when used appropriately

›Antiemetics for vomiting

›Ondansetron 0.15 mg/kg IV (max 4 mg) in children

›Ondansetron 4 mg IV in adults

Surgical treatment (definitive)

›Symptomatic Meckel diverticulum: surgical resection is standard of care

›Laparoscopic approach preferred

›Increasingly used with good outcomes

›Conversion to open if laparoscopic control not achievable

›Diagnostic and therapeutic in same procedure

›Diverticulectomy (wedge resection)

›Acceptable for narrow-based uncomplicated diverticulum

›Stapled or hand-sewn closure

›Lower leak risk when base not involved with ulceration

›Segmental small bowel resection with primary anastomosis

›Preferred when active bleeding with ulceration at the base

›Broad-based diverticulum where diverticulectomy risks incomplete resection

›Used when there is ischemia, necrosis, or intussusception with bowel compromise

›Incidental Meckel diverticulum management

›Management remains controversial

›Recent evidence favors resection when risk factors present

›Age < 50, male, length > 2 cm, palpable abnormality

›Mayo Clinic series (1476 patients, 2005) supports risk-stratified resection

›Surgical risk of incidental resection is low (< 2%)

›Risk of future complication decreases significantly after age 50

Antibiotic therapy

›Antibiotic indications for Meckel diverticulum

›Meckel diverticulitis without perforation

›Covers gram-negative enteric organisms and anaerobes

›Piperacillin-tazobactam 4.5 g IV every 6 hours (adults)

›Pediatric: 80-100 mg/kg/dose of piperacillin component IV every 6 hours (max 4 g piperacillin per dose)

›Perforation with peritonitis

›Broad-spectrum coverage: gram-negatives, gram-positives, anaerobes

›Piperacillin-tazobactam plus metronidazole 500 mg IV every 8 hours

›Cefazolin 2 g IV (adults) or 30 mg/kg IV (children, max 2 g) perioperative prophylaxis for uncomplicated resection

›Duration of antibiotic therapy

›Diverticulitis without perforation: 3-5 days, guided by clinical response

›Perforation with peritonitis: 4-7 days post-operatively or until clinical resolution

›Alternative antibiotics

›Ampicillin-sulbactam 3 g IV every 6 hours if piperacillin-tazobactam unavailable

›Renal dose adjustment when creatinine clearance < 30 ml/min

›Metronidazole 500 mg IV every 8 hours for anaerobic coverage

›Pediatric: 7.5 mg/kg IV every 8 hours (max 500 mg per dose)

Meckel scan enhancement protocol

›Pre-scintigraphy preparation

›H2-receptor antagonist pretreatment

›Ranitidine 1 mg/kg IV (max 50 mg) 30-60 minutes before scan

›Reduces luminal washout of Tc-99m pertechnetate

›Famotidine 0.5 mg/kg IV as alternative

›Fasting requirement

›4-6 hours NPO before scan to reduce gastric background activity

›IV fluids for maintenance hydration during fasting in children

›Scan timing

›Dynamic phase 60-90 minutes; focal ectopic uptake appearing simultaneously with stomach is diagnostic

›Delayed images at 2-4 hours if initial scan equivocal

09Special Populations/sp71

Pregnancy

›Meckel diverticulum in pregnancy

›Prevalence and presentation

›Congenital anomaly; symptoms may occur at any age including pregnancy

›Obstruction more likely than bleeding in pregnancy

›Uterine enlargement displaces bowel anatomy; presentations may be atypical

›Imaging approach

›Ultrasound first-line to avoid ionizing radiation

›MRI abdomen preferred over CT when ultrasound inconclusive

›CT with radiation shielding if patient is hemodynamically unstable and MRI not immediately available

›Meckel scan considerations in pregnancy

›Tc-99m pertechnetate crosses placenta; generally contraindicated in pregnancy

›Radiation dose to fetus should be minimized; nuclear medicine in pregnancy requires informed consent and obstetric consultation

›Surgical management

›Laparoscopic resection can be performed safely in first and second trimester

›Third trimester: open approach or planned post-partum resection depending on urgency

›Obstetric consultation mandatory for all surgical decisions

›Antibiotic safety

›Beta-lactams (ampicillin-sulbactam, piperacillin-tazobactam) generally preferred

›Metronidazole: Category B; acceptable in second and third trimester for life-threatening indications

›Avoid fluoroquinolones and tetracyclines in pregnancy

›Fetal monitoring

›Continuous fetal monitoring during and after surgery if viable gestation

›Maternal hemodynamic stability protects uteroplacental perfusion

Geriatric

›Meckel diverticulum in older adults

›Age-related presentation pattern

›Patients > 50 years less commonly symptomatic (OR 3.5 for < 50 years)

›Diverticulitis and obstruction more common than bleeding in adults

›Presentations mimic appendicitis, Crohn disease, or malignancy

›Meckel scan limitations

›Sensitivity drops significantly in older adults (62-88%)

›Lower prevalence of ectopic gastric mucosa in adult symptomatic MD

›CT enterography and device-assisted enteroscopy more commonly needed

›Comorbidity impact

›Anticoagulant and antiplatelet use increases bleeding severity

›Cardiac and renal comorbidities complicate resuscitation

›Higher surgical risk; anesthesia and surgical team discussion required

›Antibiotic dosing adjustments

›Renal function-guided dosing for all renally-cleared antibiotics

›Piperacillin-tazobactam: dose adjustment if GFR < 40 ml/min

›Incidental Meckel diverticulum management in older adults

›Resection generally not recommended in asymptomatic adults > 50 years

›Surgical risk exceeds lifetime complication risk in this group

Pediatrics

›Pediatric Meckel diverticulum

›Age-specific presentation patterns

›Under age 2: bleeding is most common presentation (52% of pediatric cases)

›Older children: obstruction and intussusception more common

›Diverticulitis in children can precede or follow bleeding episodes

›Meckel scan performance in children

›Sensitivity 80-95%, specificity 95-100% in pediatric age group

›Positive scan appears as simultaneous gastric and right iliac fossa uptake

›Preferred imaging modality for suspected bleeding MD in children

›Diagnostic predictive score application

›Score >= 6 may justify direct surgical exploration

›Avoids additional radiation and procedure delays in high-probability cases

›Validated specifically for pediatric patients

›Weight-based antibiotic dosing

›Piperacillin-tazobactam 80 mg/kg/dose IV every 6 hours (max 4 g piperacillin per dose)

›Ampicillin-sulbactam 50 mg/kg/dose IV every 6 hours (ampicillin component; max 2 g per dose)

›Metronidazole 7.5 mg/kg IV every 8 hours (max 500 mg per dose)

›Cefazolin surgical prophylaxis 30 mg/kg IV (max 2 g) within 60 minutes of incision

›Fluid resuscitation in children

›Isotonic crystalloid 20 ml/kg IV bolus; reassess after each bolus

›pRBCs 10-15 ml/kg if Hgb < 70 g/L or hemodynamic instability

›Hypoglycemia monitoring during fasting; D10W or D5NS maintenance if needed

›Intussusception with Meckel lead point

›Pneumatic or hydrostatic enema reduction not appropriate when Meckel is lead point

›Pathologic lead points require surgical reduction and resection

›Air enema success rate low with pathologic lead point; perforation risk if repeated

›Child protection considerations

›Recurrent unexplained abdominal injury without appropriate workup warrants safeguarding assessment

›Document injury pattern and caregiver explanation for all pediatric abdominal emergencies

10Background/b78

Epidemiology

›Prevalence and demographics

›Meckel diverticulum prevalence 1-3% of general population

›Most common congenital anomaly of the gastrointestinal tract

›Sporadic occurrence; not hereditary

›Symptomatic rate

›Only 4-9% of those with MD ever become symptomatic

›Male predominance: symptomatic M:F ratio up to 3-4:1

›Age at presentation

›Over 50% of bleeding episodes present before age 2

›Risk of symptoms decreases with age after 50 years

›Population-level data

›Taiwan nationwide study (Chang et al. 2021): surgical rate 0.026% over 17 years

›Lifetime complication risk estimated at 4-6.4%

›Complication distribution by age

›Children: bleeding 52%, obstruction 29%, diverticulitis 8%

›Intussusception more common in older children

›Volvulus around fibrous band in younger children

›Adults: diverticulitis 47%, obstruction 30%, GI bleeding 20%

›Adult presentations more commonly inflammatory

›Neoplasm (carcinoid, GIST) reported but rare (< 1%)

›Mayo Clinic series (Park et al. 2005, n=1476 patients, 1950-2002)

›Largest published single-center series

›Risk of lifetime complication higher in patients with risk factors

Pathophysiology

›Embryological origin

›Persistent omphalomesenteric (vitelline) duct remnant

›Normally obliterates by 7th week of gestation

›Failure of obliteration produces variety of remnants

›Meckel diverticulum is the most common remnant type

›True diverticulum anatomy

›Contains all layers of bowel wall (mucosa, submucosa, muscularis, serosa)

›Located on antimesenteric border of terminal ileum

›Own blood supply from a persistent vitelline artery branch

›Ectopic tissue and complications

›Ectopic gastric mucosa (most clinically significant)

›Present in 24-71% of symptomatic Meckel diverticula

›Secretes hydrochloric acid causing peptic ulceration of adjacent ileal mucosa

›Ulceration leads to hemorrhage; most common complication in children

›Ectopic pancreatic tissue

›Less common; can cause inflammation or exocrine secretion

›Not detectable by Tc-99m pertechnetate scan

›Obstruction mechanisms

›Intussusception: diverticulum acts as pathologic lead point

›Volvulus: bowel wraps around fibrous remnant band to umbilicus

›Adhesive bands from fibrous remnant connecting to abdominal wall

›Internal hernia through a mesodiverticular defect

›Inflammation and perforation

›Diverticulitis: obstructed lumen, bacterial overgrowth, inflammation

›Perforation through ulcerated base or ischemic diverticulitis

›Secondary peritonitis from perforated Meckel is a surgical emergency

Therapeutic Considerations

›Surgical strategy principles

›Symptomatic MD: resection is always indicated

›Definitive cure; no role for conservative management long-term

›Laparoscopic resection associated with shorter recovery, lower complication rate

›Choice of procedure (diverticulectomy versus segmental resection)

›Diverticulectomy when: narrow base, no ulceration at base, no ischemia

›Segmental resection when: active bleeding from base, broad base, ischemia, or intussusception with bowel compromise

›Incidental MD: individualized risk-benefit analysis

›Risk factors for future complications: age < 50, male sex, length > 2 cm, abnormal tissue

›Surgical risk of resection is low when performed by experienced surgeon

›No consensus; shared decision-making with patient and surgeon

›Meckel scan optimization

›Pretreatment enhances diagnostic yield

›H2 blocker pretreatment reduces false negatives from tracer washout

›Fasting essential before scan

›False positive and false negative management

›Negative scan does not exclude Meckel in high-clinical-probability cases

›Clinical Diagnostic Predictive Score >= 6 may justify direct surgery

›Capsule endoscopy or device-assisted enteroscopy for inconclusive cases

›Evidence base for management decisions

›ACG Clinical Guideline on Small Bowel Bleeding (Gerson et al. 2015)

›Capsule endoscopy first-line for obscure GI bleeding after negative upper and lower endoscopy

›Device-assisted enteroscopy for therapy after capsule identification

›SNMMI and EANM Practice Guideline for Meckel Scintigraphy 2.0 (2014)

›Tc-99m pertechnetate scan remains the primary diagnostic tool for suspected bleeding MD

›Provides guidance on pretreatment, patient preparation, and interpretation

›ACG and SAR Consensus Imaging Recommendations (Sengupta et al. 2024)

›Role of imaging for gastrointestinal bleeding includes nuclear medicine and CT angiography

›Supports integrated multidisciplinary approach for GI hemorrhage

11Patient Discharge Instructions/pdi35

copy discharge instructions

›Home care instructions after Meckel diverticulum evaluation

›If sent home after a self-limited bleeding episode

›Your child or you had a GI bleed that has stopped and you are stable enough to go home

›A follow-up test (Meckel scan) or surgery may be arranged

›Keep all scheduled follow-up appointments with surgery or gastroenterology

›Activity and diet

›Resume normal diet as tolerated after bleeding has stopped

›Avoid NSAIDs (ibuprofen, naproxen, aspirin) as they can worsen bleeding from the stomach lining within the diverticulum

›No specific dietary restrictions unless instructed by surgeon

›Return to emergency department immediately if

›Rectal bleeding returns or worsens

›Any passage of bright red, dark red, or maroon blood from the rectum

›Large clots passed rectally

›Abdominal pain develops or worsens

›Severe constant abdominal pain not relieved by position change

›Abdominal swelling or rigid abdomen

›Vomiting, especially green or yellow bile-colored vomit

›This can indicate a bowel blockage and is an emergency

›Signs of blood loss or anemia

›Dizziness, lightheadedness, or fainting

›Rapid heart rate or feeling the heart pounding

›Pale skin or lips

›Fever above 38.5 C (101.3 F)

›May indicate infection, diverticulitis, or perforation

›Child is unusually lethargic, inconsolable, or cannot keep fluids down

›Dehydration and serious illness risk in young children

›Follow-up instructions

12References/r34

Guidelines and key sources

›Society guidelines

›Spottswood SE et al. SNMMI and EANM Practice Guideline for Meckel Diverticulum Scintigraphy 2.0. Journal of Nuclear Medicine Technology. 2014.

›Primary standard for Tc-99m pertechnetate scintigraphy technique and interpretation

›Pretreatment protocols and performance characteristics

›Gerson LB, Fidler JL, Cave DR, Leighton JA. ACG Clinical Guideline: Diagnosis and Management of Small Bowel Bleeding. American Journal of Gastroenterology. 2015.

›Capsule endoscopy and device-assisted enteroscopy recommendations

›Management of obscure GI bleeding including Meckel etiology

›Sengupta N et al. The Role of Imaging for Gastrointestinal Bleeding: Consensus Recommendations from ACG and SAR. American Journal of Gastroenterology. 2024.

›CT angiography and nuclear medicine roles in GI hemorrhage

›Integrated imaging algorithm

›Key studies

›Park JJ, Wolff BG et al. Meckel Diverticulum: The Mayo Clinic Experience With 1476 Patients (1950-2002). Annals of Surgery. 2005.

›Largest single-center series; established risk factors for symptomatic MD

›Supports individualized resection decision for incidental MD

›Hansen CC, Soreide K. Systematic Review of Epidemiology, Presentation, and Management of Meckel's Diverticulum in the 21st Century. Medicine. 2018.

›Contemporary epidemiology, complication rates, and management evidence

›4-6.4% lifetime complication rate; age and sex risk stratification

›Jaramillo C, Jensen MK, McClain A et al. Clinical Diagnostic Predictive Score for Meckel Diverticulum. Journal of Pediatric Surgery. 2021.

›Validated pediatric scoring tool for Meckel probability estimation

›Score >= 6 supports direct surgical exploration

›Srisan N et al. Meckel's Diverticulum: Differences in Clinical Features Between Children and Adults. Pediatric Surgery International. 2025.

›Contemporary data on pediatric versus adult presentation patterns

›Supports age-stratified diagnostic approach

›Li B et al. Diagnostic Accuracy of Tc-99m Pertechnetate Scintigraphy in Pediatric Patients With Suspected Meckel's Diverticulum: 12-Year Retrospective Experience. Frontiers in Medicine. 2025.

›Contemporary sensitivity and specificity data for pediatric Meckel scan

›Chang YC et al. Epidemiology of Meckel's Diverticulum: Nationwide Population-Based Study in Taiwan. Medicine. 2021.

›Population-level incidence and surgical outcome data

Evidence & Review

Evidence & Review