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Intussuception

NCLEX Review Guide: Pediatric Intussusception

Pathophysiology

Definition & Mechanism

Intussusception is a condition where a segment of intestine telescopes or invaginates into an adjacent distal segment, causing obstruction, inflammation, and potential ischemia of the affected bowel segment.
This telescoping creates a mass that can obstruct the intestinal lumen and compromise blood supply to the affected bowel segment, potentially leading to bowel necrosis if left untreated.

Key Points

Most common between 3-12 months of age, with peak incidence at 5-9 months
Ileocolic intussusception (ileum into colon) is the most common type
Can lead to intestinal obstruction, ischemia, and perforation if not treated promptly

Etiology & Risk Factors

Most cases (90%) in children are idiopathic, but may be associated with viral infections, particularly adenovirus, which can cause hypertrophy of Peyer's patches.
Identifiable lead points occur in approximately 10% of cases and may include Meckel's diverticulum, polyps, lymphoma, or other intestinal pathologies.

Key Points

More common in males (3:2 male-to-female ratio)
Risk increases following viral gastroenteritis or upper respiratory infections
Children with cystic fibrosis, Henoch-Schönlein purpura, or intestinal lymphoma have increased risk

Clinical Manifestations

Classic Triad

The classic triad of intussusception includes colicky abdominal pain, vomiting, and bloody stools ("currant jelly" stools), though only about 20-40% of children present with all three symptoms.
Episodes of pain typically occur at 15-30 minute intervals, during which the child may draw up their knees, cry inconsolably, and appear pale and diaphoretic, followed by periods of relative comfort.

Key Points

Intermittent, severe abdominal pain is the most consistent symptom
"Currant jelly" stools (mixed with blood and mucus) are a late sign
Lethargy between pain episodes is a significant clinical indicator

Clinical Scenario

A 7-month-old male is brought to the emergency department with a 12-hour history of intermittent crying episodes lasting 5-10 minutes, followed by periods of lethargy. The mother reports he vomited twice and his most recent diaper contained stool mixed with blood and mucus. On examination, the infant appears pale and lethargic between crying episodes, and a sausage-shaped mass is palpable in the right upper quadrant.

Physical Examination Findings

A sausage-shaped, sometimes curved mass may be palpable in the right upper quadrant or epigastrium, representing the intussuscepted bowel segment.
Physical examination may reveal abdominal distention, tenderness, decreased or absent bowel sounds, and an empty right lower quadrant (Dance's sign).

Key Points

Palpable abdominal mass is present in approximately 60% of cases
Dance's sign: emptiness in the right lower quadrant
Signs of dehydration and shock may be present in advanced cases

Diagnosis

Diagnostic Procedures

Abdominal ultrasound is the diagnostic test of choice with high sensitivity (98-100%) and specificity (88-100%), typically showing a "target sign" or "doughnut sign" in transverse view and a "pseudokidney" appearance in longitudinal view.
Air or contrast enema can be both diagnostic and therapeutic, showing a "coiled spring" or "stacked coins" appearance as contrast fills around the intussuscepted segment.

Key Points

Ultrasound is the initial imaging modality of choice
Plain abdominal radiographs may show signs of intestinal obstruction
Laboratory studies (CBC, electrolytes) help assess for complications but are not diagnostic

Differential Diagnosis

Differential diagnoses include gastroenteritis, appendicitis, volvulus, Meckel's diverticulum, and other causes of intestinal obstruction or gastrointestinal bleeding.
Henoch-Schönlein purpura (HSP) can present with abdominal pain and gastrointestinal bleeding but is typically accompanied by a characteristic purpuric rash on the lower extremities and buttocks.

Comparison of Common Pediatric Abdominal Emergencies

Condition	Key Clinical Features	Diagnostic Findings
Intussusception	Intermittent colicky pain, currant jelly stools, palpable mass	Target sign on ultrasound, coiled spring on contrast enema
Appendicitis	Periumbilical pain migrating to RLQ, fever, anorexia	Enlarged appendix on ultrasound, leukocytosis
Volvulus	Bilious vomiting, abdominal distention, rapid deterioration	Dilated bowel loops, bird's beak appearance on contrast studies
Gastroenteritis	Diarrhea, vomiting, fever, diffuse abdominal pain	Normal imaging, possible leukocytosis

Management & Treatment

Non-surgical Reduction

Air or hydrostatic (contrast) enema reduction is the first-line treatment with success rates of 70-90%, with air enema generally preferred due to lower radiation exposure and higher success rates.
Contraindications to enema reduction include signs of peritonitis, perforation, shock, or prolonged symptoms (>48 hours), which necessitate immediate surgical intervention.

Enema Reduction Procedure

Stabilize the patient with IV fluids and nasogastric decompression
Obtain informed consent, explaining risks including perforation (0.1-3%)
Position patient appropriately for the procedure
Administer air or contrast under fluoroscopic or ultrasound guidance
Apply controlled pressure (80-120 mmHg for air, 3-4 feet hydrostatic pressure for contrast)
Monitor for successful reduction (contrast flowing into small intestine)
Observe patient for 24 hours post-procedure for recurrence

Key Points

Success rates are higher with shorter duration of symptoms
Recurrence occurs in 5-10% of cases, usually within 24-48 hours
Multiple attempts (up to 3) may be necessary for successful reduction

Surgical Management

Surgical intervention is indicated when non-surgical reduction fails, contraindications to enema reduction exist, or a pathologic lead point is suspected.
The surgical approach involves manual reduction of the intussusception and, if bowel is nonviable, resection of the affected segment with primary anastomosis.

Key Points

Laparoscopic approach is increasingly used with excellent outcomes
Bowel resection is required in 10-15% of surgical cases
Identification and removal of lead points is essential when present

Nursing Care & Interventions

Pretreatment Nursing Care

Perform thorough assessment including vital signs, level of hydration, abdominal examination, and stool characteristics while monitoring for signs of deterioration or shock.
Establish IV access for fluid resuscitation and medication administration, and insert a nasogastric tube for decompression if significant vomiting or abdominal distention is present.

Key Points

Maintain NPO status in preparation for potential procedures
Administer analgesics as ordered for pain management
Monitor for signs of peritonitis or perforation (increasing pain, fever, rigid abdomen)

Post-reduction Nursing Care

Monitor vital signs, abdominal assessment, and stool characteristics frequently for at least 24 hours post-reduction to detect early signs of recurrence or complications.
Advance diet gradually as tolerated, beginning with clear liquids and progressing to regular diet based on the child's condition and provider orders.

Key Points

Assess for return of normal bowel function (passage of stool, absence of vomiting)
Educate parents about signs of recurrence requiring immediate medical attention
Document response to feeding and medication administration

Memory Aid: The 5 P's of Intussusception

Pain (colicky, intermittent)
Pallor (during pain episodes)
Palpable sausage-shaped mass
Passage of "currant jelly" stools
Prostration (lethargy between pain episodes)

Complications & Prognosis

Potential Complications

Without timely treatment, intussusception can lead to bowel ischemia, necrosis, perforation, peritonitis, sepsis, and potentially death within 24-48 hours.
Enema reduction carries a small risk of perforation (0.1-3%), and recurrence occurs in approximately 5-10% of successfully reduced cases, most commonly within the first 24-48 hours.

Key Points

Mortality rate is <1% with prompt treatment but increases to 2-5% with delayed diagnosis
Long-term intestinal complications are rare following successful treatment
Multiple recurrences may warrant investigation for pathologic lead points

Prognosis & Follow-up

With prompt diagnosis and treatment, the prognosis for intussusception is excellent, with most children making a full recovery without long-term sequelae.
Follow-up care typically includes a post-discharge visit to ensure complete resolution and to monitor for recurrence, with no specific long-term follow-up required for uncomplicated cases.

Key Points

Most children can resume normal activities within a few days after successful reduction
No dietary restrictions are necessary following recovery
Parents should be educated about the possibility of recurrence and when to seek medical attention

Summary of Key Points

Intussusception is the most common cause of intestinal obstruction in children between 3 months and 3 years of age, with peak incidence at 5-9 months.
The classic clinical triad includes colicky abdominal pain, vomiting, and "currant jelly" stools, though all three features are present in only 20-40% of cases.
Abdominal ultrasound is the diagnostic test of choice, showing characteristic "target" or "doughnut" sign.
Air or hydrostatic enema is both diagnostic and therapeutic, with success rates of 70-90%.
Surgical intervention is indicated when non-surgical reduction fails or is contraindicated.
Recurrence occurs in 5-10% of cases, most commonly within the first 24-48 hours after reduction.
With prompt treatment, prognosis is excellent with mortality rates <1%.

Commonly Confused Points

Intussusception vs. Volvulus

Feature	Intussusception	Volvulus
Definition	Telescoping of one bowel segment into another	Twisting of bowel around its mesenteric axis
Age Group	3-12 months (peak: 5-9 months)	Neonates (midgut volvulus) or elderly (sigmoid volvulus)
Presentation	Intermittent colicky pain, currant jelly stools	Sudden onset bilious vomiting, abdominal distention
Diagnostic Findings	Target sign on ultrasound, coiled spring on contrast enema	Bird's beak appearance on contrast studies, whirlpool sign on ultrasound
Treatment	Air/hydrostatic enema reduction, surgery if needed	Emergent surgical intervention

Intussusception vs. Gastroenteritis

Feature	Intussusception	Gastroenteritis
Pain Pattern	Intermittent, severe, colicky pain with pain-free intervals	Diffuse, continuous, crampy abdominal pain
Vomiting	Initially non-bilious, may become bilious	Usually non-bilious, frequent
Stool Characteristics	Bloody, mucoid "currant jelly" stools	Watery diarrhea, may contain small amounts of blood
Physical Exam	Palpable abdominal mass, Dance's sign	Diffuse abdominal tenderness, no mass
Mental Status	Lethargy between pain episodes	Generally alert unless severely dehydrated

Study Tips

Focus on the classic presentation and red flags for intussusception, particularly the pattern of pain (intermittent, colicky) and the characteristic "currant jelly" stools.
Understand the priority nursing assessments and interventions, including monitoring for signs of peritonitis or perforation that would necessitate immediate surgical intervention.
Remember the contraindications to non-surgical reduction, as these will likely be tested in priority-setting questions.

Memory Aid: ABCDE Assessment for Intussusception

Abdominal mass (sausage-shaped, right upper quadrant)
Blood in stool ("currant jelly" appearance)
Colicky pain (intermittent, severe)
Dance's sign (empty right lower quadrant)
Episodes of lethargy between pain

Key NCLEX Tips

Focus on assessment and early recognition of symptoms
Know the priority nursing interventions before and after reduction
Understand parent education points, especially regarding signs of recurrence
Remember the contraindications to non-surgical reduction

Common Pitfalls

Don't confuse intussusception with simple gastroenteritis - the intermittent nature of pain and lethargy between episodes are key distinguishing features.
Don't delay treatment waiting for all classic symptoms - many children will not present with the complete triad of symptoms.
Don't forget to assess for signs of peritonitis - rigid abdomen, rebound tenderness, and fever may indicate perforation requiring immediate surgical intervention.
Don't overlook the importance of post-reduction monitoring - recurrence is most common within the first 24-48 hours.

Quick Check

What is the most common type of intussusception?
What are the three symptoms in the classic triad of intussusception?
What is the diagnostic test of choice for intussusception?
What percentage of cases are successfully treated with non-surgical reduction?
What is the recurrence rate following successful reduction?

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Intussuception

NCLEX Review Guide: Pediatric Intussusception

Pathophysiology

Definition & Mechanism

Key Points

Etiology & Risk Factors

Key Points

Clinical Manifestations

Classic Triad

Key Points

Clinical Scenario

Physical Examination Findings

Key Points

Diagnosis

Diagnostic Procedures

Key Points

Differential Diagnosis

Comparison of Common Pediatric Abdominal Emergencies

Management & Treatment

Non-surgical Reduction

Enema Reduction Procedure

Key Points

Surgical Management

Key Points

Nursing Care & Interventions

Pretreatment Nursing Care

Key Points

Post-reduction Nursing Care

Key Points

Memory Aid: The 5 P's of Intussusception

Complications & Prognosis

Potential Complications

Key Points

Prognosis & Follow-up

Key Points

Summary of Key Points

Commonly Confused Points

Intussusception vs. Volvulus

Intussusception vs. Gastroenteritis

Study Tips

Memory Aid: ABCDE Assessment for Intussusception

Key NCLEX Tips

Common Pitfalls

Self-Assessment

Quick Check