01Approach to the Critical Patient/attcp51

Immediate priorities

›Time-critical recognition

›Bilious emesis in any neonate is midgut volvulus until proven otherwise

›No safe observation window — even brief symptom duration can result in bowel necrosis

›Class I surgical emergency; immediate pediatric surgery consultation

›Hemodynamic instability triggers

›Tachycardia disproportionate to age

›Hypotension — late and ominous sign

›Poor perfusion, mottled skin, lethargy in neonates

›Peritoneal signs indicating necrosis or perforation

›Guarding, rigidity, rebound tenderness

›Bloody stools — late sign of mucosal ischemia

›ABC stabilization

›Airway and breathing

›Supplemental oxygen for hypoxemia

›NPO immediately upon suspicion

›Nasogastric tube decompression

›Circulation

›Large-bore IV access, two sites

›Isotonic crystalloid bolus 20 ml/kg IV in neonates and children

›Repeat fluid boluses to restore perfusion

›Surgical activation — do not delay for imaging in unstable patients

›Pediatric surgery consultation immediately

›Transfer to pediatric surgical centre if not available on-site

Monitoring and targets

›Monitoring bundle

›Continuous cardiac monitoring and pulse oximetry

›Heart rate trend — tachycardia suggests ongoing ischemia or shock

02History/hx45

Presentation pattern

›Cardinal symptom

›Bilious (green) vomiting

›Present in approximately 71% of cases

›Hallmark symptom — bilious emesis in neonate is volvulus until excluded

›Abdominal pain

›Crampy, diffuse, or periumbilical in older children and adults

›Irritability and inconsolability in neonates as pain equivalent

›Abdominal distension and cessation of stooling or flatus

›Progressive distension suggests obstruction or ischemia

›Bloody stools or hematochezia — late finding indicating mucosal ischemia

Timing and age

›Age at presentation

›Greater than 50% present in the first month of life

›Approximately 66% of all cases are neonates

›Peak incidence in first days to weeks of life

›Can present at any age including adulthood

›Adults present with sudden-onset abdominal pain, nausea, vomiting, obstipation

›Chronic or intermittent volvulus may present with feeding intolerance and poor weight gain in older children

›Symptom duration greater than 24 hours significantly increases risk of intestinal necrosis

Risk factors

›Primary predisposing condition

›Intestinal malrotation

›Narrow mesenteric base creates anatomic substrate for volvulus

›Primary predisposing condition in the vast majority of cases

›Congenital anomalies

›Heterotaxy syndrome — associated malrotation with cardiac anomalies

›Omphalocele and gastroschisis

03Physical Exam/exam41

Vitals and general

›Vital signs assessment

›Temperature

›Fever suggests necrosis or sepsis

›Hypothermia as severe sepsis marker in neonates

›Heart rate

›Tachycardia disproportionate to age — key early sign

›Age-specific normal ranges critical for interpretation

›Blood pressure

›Hypotension — late and ominous finding

›SBP less than the lower limit for age requires immediate resuscitation

›General appearance

›Lethargy and poor perfusion in neonates

›Mottled skin — suggests circulatory compromise

Abdominal exam

›Abdominal findings

›Distension

›Diffuse distension suggests distal obstruction

›Deceptively benign appearance early before ischemia develops

›Tenderness

›Diffuse tenderness with tympany

›May be minimal early — a key pitfall

›Peritoneal signs

›Guarding, rigidity, rebound tenderness indicate necrosis or perforation

›Mandatory immediate surgical consultation when present

›Rectal exam

›Empty vault

›Hematochezia or guaiac-positive stool — late finding

04Differential Diagnosis/ddx47

Neonatal obstruction mimics

›Life-threatening neonatal differentials

›Duodenal atresia or stenosis

›ICD-10 Q41.0

›Double bubble sign on abdominal radiograph

›No bilious emesis if obstruction is proximal to ampulla of Vater

›Jejunal or ileal atresia

›ICD-10 Q41.1

›Distal obstruction pattern with multiple air-fluid levels

›Necrotizing enterocolitis

›ICD-10 P77

›Premature infants, pneumatosis intestinalis on imaging

›Meconium ileus

›ICD-10 P76.0

›Distal obstruction in cystic fibrosis

›Bubbly appearance on radiograph

›Other neonatal mimics

›Hirschsprung disease

›ICD-10 Q43.1

›Failure to pass meconium, distal obstruction

›Incarcerated inguinal hernia

›ICD-10 K42.0

›Palpable groin mass

Pediatric mimics

›Common pediatric differentials

›Intussusception

›ICD-10 K56.1

›Intermittent colicky pain, target sign on ultrasound, currant jelly stools

05Laboratory Tests/lt36

Core resuscitation labs

›Hematologic and infectious markers

›Complete blood count

›Leukocytosis with left shift and elevated neutrophil ratio associated with intestinal necrosis

›Leukopenia as marker of severe sepsis in neonates

›C-reactive protein and procalcitonin

›Markers of systemic inflammation and sepsis

›Serial trending when diagnosis uncertain

›Type and screen or crossmatch

›Preparation for emergent surgery

›Crossmatch for massive resection scenarios

›Metabolic panel

›Electrolytes and renal function

›Hypokalemia and metabolic alkalosis from vomiting

›Metabolic acidosis if bowel ischemia present

›Glucose

›Hypoglycemia common in neonates — requires correction

›Hyperglycemia as stress marker in older patients

›Coagulation studies

›DIC workup if septic — PT, PTT, fibrinogen, D-dimer

›Critical in neonates with prolonged ischemia

Perfusion and ischemia markers

›Lactate

›Serum lactate in mmol/l

›Greater than 2 mmol/l indicates organ hypoperfusion

›Greater than 4 mmol/l associated with bowel necrosis and high mortality

›Serial lactate to monitor response to resuscitation

›Trending upward despite fluids mandates emergent OR

06Diagnostic Tests/dt69

Scoring Systems

›Clinical risk stratification

›No validated clinical scoring system specific to midgut volvulus

›Diagnosis is clinical and radiologic

›Severity stratification guides surgical urgency

›Severity stratification framework

›Viable bowel: early presentation, no peritoneal signs, no metabolic acidosis

›Necrotic bowel: delayed presentation greater than 24 hours, peritonitis, shock, elevated WBC

›Catastrophic: massive midgut necrosis with short gut syndrome risk

›Imaging severity markers

›Ascites on imaging associated with intestinal necrosis

›Pneumatosis intestinalis indicates advanced mucosal ischemia

›Portal venous gas indicates severe ischemia or necrosis

MRI

›MRI role in midgut volvulus

›Limited acute utility

›Not a first-line modality for suspected midgut volvulus

›Prolonged scan time incompatible with surgical emergency

›Problem-solving indications

›Chronic or recurrent volvulus with equivocal ultrasound and upper GI findings

›Mesenteric anatomy delineation preoperatively in selected stable patients

›Contraindications

›Hemodynamically unstable patient

›Neonates requiring intensive monitoring and support

CT

›CT abdomen indications

›Primary imaging in adults and older children

›CT abdomen and pelvis with IV contrast

›Whirlpool sign of mesenteric vessels swirling around SMA — highly specific

›CT findings in midgut volvulus

›Swirling of mesentery around the SMA — whirlpool sign

›Bowel wall thickening and mesenteric edema

›Pneumatosis intestinalis — mucosal ischemia

›Portal venous gas — advanced ischemia or necrosis

›Ascites — associated with intestinal necrosis

›ACR Appropriateness Criteria for suspected small bowel obstruction

›CT abdomen and pelvis with IV contrast usually appropriate

›Supports surgical planning and extent-of-necrosis assessment

›CT limitations

›Radiation exposure — prefer ultrasound in neonates and young children

›Reserve CT for inconclusive ultrasound or adult presentations

›Imaging must not delay surgery in the unstable patient

Ultrasound

›Abdominal ultrasound with Doppler — first-line in pediatric patients

›Diagnostic performance

›Sensitivity 94 to 97% for volvulus

›Specificity 96 to 100% for volvulus

›Whirlpool sign

›Twisting of bowel and mesentery around the SMA

›Accuracy 99% for volvulus

›SMA to SMV relationship

›Abnormal SMV to the left of or anterior to SMA suggests malrotation

›Normal SMV lies to the right of SMA

›Additional ultrasound findings

›Dilated proximal duodenum — median 13 mm in volvulus versus 6 mm without

›SMA cutoff sign with abrupt termination of SMA flow

›Ascites — associated with intestinal necrosis

›Upper GI contrast series

›Historically gold standard with sensitivity 93 to 100%

›Corkscrew or coiled spring appearance of duodenum and proximal jejunum

›Abnormal position of the duodenojejunal flexure (ligament of Treitz)

›Reserve for nondiagnostic or equivocal ultrasound

›Requires stable patient who can tolerate procedure

›Point-of-care ultrasound (POCUS)

›Bedside screening for whirlpool sign and abnormal SMA/SMV relationship in ED

›Multi-institutional case series supports POCUS utility in pediatric ED

›Operator-dependent; confirmatory formal ultrasound recommended

›Abdominal radiograph

›Initial screening tool — nonspecific

›Double bubble sign — duodenal obstruction pattern

›Paucity of distal gas — proximal obstruction

›Diffuse distension — late or complicated obstruction

›Normal radiograph does not exclude volvulus

07Disposition/dispo28

Surgical admission

›All confirmed or suspected midgut volvulus require emergent surgical admission

›No safe observation period — do not watch and wait

›Even short symptom duration can result in catastrophic outcomes

›Immediate operating room activation for all suspected cases

›OR team notification concurrent with stabilization

›Level of care

›NICU or PICU postoperatively for neonates and infants

›ICU admission if hemodynamically unstable, septic, or post-extensive resection

›General ward for stable children after uncomplicated Ladd's procedure

Transfer criteria

›Transfer to pediatric surgical centre

›Transfer if pediatric surgery not available on-site

›Do not delay transfer for imaging workup

›Stabilize and transfer concurrently with communication to receiving team

›Accepting centre notification

›Pediatric surgery, neonatology, PICU team activated at receiving site

›Transport requirements

›Hemodynamic stabilization before transfer when possible

›Nasogastric tube decompression in place

›IV access secured with fluids running

Follow up

›Postoperative monitoring

›Pediatric surgery follow-up within 1 to 2 weeks postoperatively

›Monitor for recurrent volvulus — recurrence rate 2 to 10% after Ladd's

›Higher recurrence rate with laparoscopic versus open approach

›Adhesive small bowel obstruction surveillance

›Occurs in 6 to 10% after open Ladd's; lower after laparoscopic approximately 1%

08Treatment/t78

Initial stabilization

›Resuscitation

›IV fluid resuscitation

›Isotonic crystalloid 20 ml/kg IV bolus in neonates and children

›Repeat as needed to restore perfusion

›Correct electrolyte derangements

›NPO and gastric decompression

›Nasogastric tube insertion for decompression

›No prokinetics or laxatives — contraindicated in mechanical obstruction

›Glycaemic correction

›Dextrose supplementation if hypoglycaemic — common in neonates

Antibiotics

›Indications

›Peritonitis, sepsis, or suspected bowel necrosis

›Broad-spectrum antibiotics initiated before surgery

›Do not delay surgery for antibiotic administration

›Neonatal regimen

›Ampicillin plus gentamicin plus metronidazole

›Ampicillin 50 mg/kg IV every 6 to 8 hours

›Gentamicin 4 to 5 mg/kg IV every 24 hours (once-daily dosing)

›Metronidazole 15 mg/kg IV loading dose, then 7.5 mg/kg IV every 12 hours in neonates

›Renal function and gestational age guide aminoglycoside dosing

›Serum drug level monitoring required

›Older children and adults

›Piperacillin-tazobactam IV

›Adults: 4.5 g IV every 6 hours

›Children: 100 mg/kg of piperacillin component IV every 8 hours (max 4 g/dose)

›Extended infusion per local protocol for severe sepsis

›Alternative: cefazolin plus metronidazole for uncomplicated cases without perforation

›Cefazolin 2 g IV every 8 hours in adults

›Metronidazole 500 mg IV every 8 hours in adults

Definitive surgical management — Ladd's procedure

›Operative steps — standard Ladd's procedure

›Counterclockwise detorsion of the volvulus

›Extent of detorsion determined intraoperatively

›Bowel viability assessed after detorsion

›Division of Ladd's bands

›Peritoneal bands crossing the duodenum

›Relieves duodenal obstruction

›Broadening of the mesenteric base

›Reduces risk of recurrent volvulus

›Critical step for long-term prevention

›Straightening of the duodenum along the right abdominal gutter (Kocherization)

›Places small bowel on right, colon on left

›Appendectomy

›Cecum placed in left lower quadrant in atypical position

›Removal prevents future diagnostic confusion for appendicitis

›Surgical approach

›Open Ladd's procedure

›Traditional approach for unstable patients or suspected necrosis

›Full abdominal access for bowel assessment

›Laparoscopic Ladd's procedure

›Feasible in hemodynamically stable patients without necrosis

›Shorter hospital stay compared with open approach

›Higher recurrent volvulus rate approximately 1 to 10%

›Conversion to open required in 11 to 44% when active volvulus is present

Bowel necrosis management

›Resection of nonviable bowel

›Damage control principles apply in critically ill patients

›Resection without anastomosis — stoma formation

›Second-look laparotomy at 24 to 48 hours to reassess borderline bowel viability

›Maximum bowel length preservation

›Critical to prevent short gut syndrome

›Fluorescein or ICG angiography to assess viability in selected centres

›Short gut syndrome management

›TPN initiation postoperatively

›Greater than 50% of neonates with volvulus require postoperative TPN in some cohorts

›Gradual enteral nutrition reintroduction — median approximately 10 days post-laparoscopic Ladd's

›Long-term TPN with risk of intestinal failure if extensive resection

›Multidisciplinary intestinal failure team referral

›Intestinal transplantation for refractory short gut syndrome

Postoperative care

›Monitoring

›Serial abdominal exams for anastomotic complications

›Leak, obstruction, recurrent volvulus

›Nutritional monitoring

›Serial weight and growth parameters in neonates

›Wound care

›Infection surveillance in immunocompromised or premature neonates

›Prognosis

›Overall cure rate greater than 90% with early intervention and viable bowel

›Mortality 3 to 10% when bowel necrosis is present

›Catastrophic outcomes with massive midgut necrosis

09Special Populations/sp55

Pregnancy

›Midgut volvulus in pregnancy

›Rare but reported — underlying malrotation may decompensate due to uterine displacement of bowel

›Presentation may mimic hyperemesis gravidarum or round ligament pain

›High index of suspicion required for bilious vomiting at any gestational age

›Imaging approach

›Abdominal ultrasound first-line — no ionizing radiation

›MRI abdomen without contrast acceptable if ultrasound equivocal

›CT with IV contrast if MRI unavailable and clinical urgency mandates — benefits outweigh radiation risk

›Surgical management

›Ladd's procedure indicated regardless of gestational age if volvulus confirmed

›Multidisciplinary team — obstetrics, surgery, neonatology, anesthesia

›Fetal monitoring throughout perioperative period when viable gestation

›Antibiotic selection

›Beta-lactams preferred — penicillins and cephalosporins generally safe

›Metronidazole used in second and third trimester when benefits outweigh risks

›Avoid aminoglycosides in pregnancy when alternatives exist

Geriatric

›Midgut volvulus in older adults

›Uncommon — secondary causes more prevalent in adults

›Adhesive bands, internal hernias, mesenteric tumors

›Malrotation incidentally detected with age

›Presentation differences

›Symptoms may be subacute or chronic mimicking irritable bowel or chronic pain

›Peritoneal signs may be attenuated due to reduced muscle tone

›Higher baseline comorbidity increases operative risk

›Management considerations

›CT abdomen and pelvis with IV contrast as primary imaging

10Background/b52

Epidemiology

›Incidence and distribution

›Intestinal malrotation incidence approximately 1 in 200 to 500 live births

›Midgut volvulus complicates malrotation — exact incidence not fully established

›Male predominance approximately 77% in some series

›Age distribution

›Greater than 50% of volvulus cases present in the first month of life

›Approximately 66% of cases occur in neonates

›Remainder distributed across childhood and adulthood

›Morbidity and mortality

›Mortality with viable bowel less than 1 to 3% with early operative intervention

›Cure rate greater than 90% when operated early with viable bowel

›Mortality rises to 3 to 10% when bowel necrosis is present

›Catastrophic outcomes with massive midgut necrosis — short gut syndrome, TPN dependence, intestinal transplant need

›Disease duration greater than 24 hours significantly increases risk of intestinal necrosis

›No safe observation window — fundamental principle of management

Pathophysiology

›Anatomic basis

›Normal intestinal rotation occurs in three stages during embryogenesis

›Total 270-degree counterclockwise rotation of midgut around the SMA

›Failure of rotation arrests at various stages, creating a narrow mesenteric base

›Narrow mesenteric base allows free rotation of the midgut around the SMA axis

›Counterclockwise twist produces midgut volvulus

›Obstruction of the SMA causes progressive ischemia

›Ischemic progression

›Venous obstruction precedes arterial occlusion

›Bowel edema, engorgement, and hemorrhagic infarction

›Progressive transmural necrosis if untreated

11Patient Discharge Instructions/pdi32

copy discharge instructions

›Midgut volvulus home care after surgery

›Surgical wound care instructions as directed by surgical team

›Keep incision clean and dry

›Report redness, swelling, or discharge from wound

›Activity restrictions

›Limit strenuous activity as directed by surgeon

›Gradual return to normal feeding and activity

›Nutrition

›Follow the feeding schedule provided by the surgical team

›Advance feeds gradually as tolerated

›Report any difficulty feeding or persistent vomiting

›Warning signs — return to emergency immediately

›Bilious (green) vomiting — possible recurrent volvulus

›This is a surgical emergency — go to the emergency room immediately

›Abdominal distension or increasing abdominal pain

›Especially if rapid onset

›Bloody stools

›Possible intestinal ischemia or anastomotic problem

›Fever greater than 38.5 degrees Celsius

›Possible wound infection or intraabdominal infection

›Lethargy, poor feeding, or decreased urine output in infants

›Signs of dehydration or serious illness

›Bile staining through wound or drains

›Follow up

›Pediatric surgery follow-up within 1 to 2 weeks

›Wound check and assessment of recovery

›Nutrition or dietitian appointment if bowel resection was performed

12References/r21

Guidelines and key sources

›Primary evidence sources

›Do WS, Lillehei CW. Malrotation: Management of Disorders of Gut Rotation for the General Surgeon. Surgical Clinics of North America 2022. PMID 36209749

›Comprehensive review of malrotation and volvulus management

›Gibson A, Silva H, Bajaj M, et al. No Safe Time Window in Malrotation and Volvulus: A Consecutive Cohort Study. Journal of Paediatrics and Child Health 2024. PMID 38715374

›Key study demonstrating absence of safe observation window

›Nguyen HN et al. Ultrasound for the Diagnosis of Malrotation and Volvulus in Children and Adolescents: A Systematic Review and Meta-Analysis. Archives of Disease in Childhood 2021. PMID 33879472

›Meta-analysis supporting ultrasound sensitivity 94-97% and specificity 96-100%

›Imaging and diagnostic references

›McCurdie FK, Meshaka R, et al. Ultrasound for Infantile Midgut Malrotation: Techniques, Pearls, and Pitfalls. Pediatric Radiology 2024. PMID 39404889

›El-Ali AM et al. Factors Associated With Diagnostic Ultrasound for Midgut Volvulus. Pediatric Radiology 2023. PMID 37589763

›Expert Panel on Gastrointestinal Imaging. ACR Appropriateness Criteria Suspected Small-Bowel Obstruction. JACR 2020

›Garcia AM et al. Multi-Institutional Case Series With Review of POCUS to Diagnose Malrotation and Midgut Volvulus in the Pediatric ED. Pediatric Emergency Care 2019. PMID 30702647

›Surgical technique references

›Kedoin C et al. Notable Clinical Differences Between Neonatal and Post-Neonatal Intestinal Malrotation. Journal of Pediatric Surgery 2024. PMID 38145920

›Johnston WR, Hwang R, Mattei P. Laparoscopic Versus Open Ladd Procedure for Midgut Malrotation. Journal of Pediatric Surgery 2024. PMID 39209687

›Abu-Elmagd K et al. Five Hundred Patients With Gut Malrotation: Thirty Years of Experience. Annals of Surgery 2021. PMID 34506313

›Takamoto N et al. Effect of Adhesion Barrier Use During Ladd Procedure. Journal of the American College of Surgeons 2026. PMID 41230950

›Coding standards

›ICD-10 Q43.3 — congenital malrotation of intestine

›ICD-10 K56.2 — volvulus of intestine

›SNOMED CT — midgut volvulus disorder concept

Evidence & Review

Evidence & Review