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550 Section III / Subspecialty Surgery

 

What are the associated

50% of cases occur with

abnormalities?

abnormalities of the GI tract,

 

cardiovascular system, GU tract,

 

musculoskeletal system, CNS, and

 

chromosomes

Of what “pentalogy” is

Pentalogy of Cantrell

omphalocele a part?

 

What is the pentalogy of

“D COPS”:

Cantrell?

Diaphragmatic defect (hernia)

 

Cardiac abnormality

 

Omphalocele

 

Pericardium malformation/absence

 

Sternal cleft

GASTROSCHISIS

 

 

 

What is it?

How is it diagnosed prenatally?

Where is the defect?

On what side of the umbilicus is the defect most commonly found?

What is the usual size of the defect?

What are the possible complications?

Defect of abdominal wall; sac does not cover extruded viscera

Possible at fetal ultrasound after 13 weeks’ gestation, elevated maternal AFP

Lateral to the umbilicus (Think: gAstrochisis lAteral)

Right

2 to 4 cm

Thick edematous peritoneum from exposure to amnionic fluid; malrotation of the gut

Other complications include hypothermia; hypovolemia from third-spacing; sepsis; and metabolic acidosis from hypovolemia and poor perfusion, NEC, prolonged ileus

How is the diagnosis made?

Prenatal U/S

 

Chapter 67 / Pediatric Surgery 551

What is the treatment?

Primary—NG tube decompression, IV

 

fluids (D10 LR), and IV antibiotics

 

Definitive—surgical reduction of viscera

 

and abdominal closure; may require

 

staged closure with silo

What is a “silo”?

Silastic silo is a temporary housing for

 

external abdominal contents; silo is slowly

 

tightened over time

What is the prognosis?

What are the associated anomalies?

What are the major differences compared with omphalocele?

How can you remember the position of omphalocele vs. gastroschisis?

How do you remember that omphalocele is associated with abnormalities in 50% of cases?

90% survival rate

Unlike omphalocele, relatively uncommon except for intestinal atresia, which occurs in 10% to 15% of cases

No membrane coverings Uncommon associated abnormalities

Lateral to umbilicus—not on umbilicus

Think: OMphalocele ON the umbilicus

Think: Omphalocele “Oh no, lots of abnormalities”

POWER REVIEW OF OMPHALOCELE AND GASTROSCHISIS

What are the differences between omphalocele and gastroschisis in terms of the following characteristics:

Anomalies?

Peritoneal/amnion covering (sac)?

Position of umbilical cord?

Common in omphalocele (50%), uncommon in gastroschisis

Always with omphalocele—never with gastroschisis

On the sac with omphalocele, from skin to the left of the gastroschisis defect

552 Section III / Subspecialty Surgery

 

Thick bowel?

Common with gastroschisis, rare with

 

omphalocele (unless sac ruptures)

Protrusion of liver?

Common with omphalocele, almost never

 

with gastroschisis

Large defect?

Omphalocele

APPENDICITIS

 

 

 

What is it?

Obstruction of the appendiceal lumen

 

(fecalith, lymphoid hyperplasia),

 

producing a closed loop with resultant

 

inflammation that can lead to necrosis

 

and perforation

What is its claim to fame?

Most common surgical disease requiring

 

emergency surgery in children

What is the affected age?

Very rare before 3 years of age

What is the usual

Onset of referred or periumbilical pain

presentation?

followed by anorexia, nausea, and

 

vomiting (Note: Unlike gastroenteritis,

 

pain precedes vomiting, then

 

migrates to the RLQ, where it

 

intensifies from local peritoneal

 

irritation)

 

If the patient is hungry and can eat,

 

seriously question the diagnosis of

 

appendicitis

How is the diagnosis made?

History and physical exam

What are the signs/

Signs of peritoneal irritation may be

symptoms?

present—guarding, muscle spasm, rebound

 

tenderness, obturator and Psoas signs;

 

low-grade fever rising to high grade if

 

perforation occurs

What is the differential

Intussusception, volvulus, Meckel’s

diagnosis?

diverticulum, Crohn’s disease, ovarian

 

torsion, cyst, tumor, perforated ulcer,

 

pancreatitis, PID, ruptured ectopic

 

pregnancy, mesenteric lymphadenitis

What is the common bacterial cause of mesenteric lymphadenitis?

What are the associated lab findings with appendicitis?

What is the role of urinalysis?

Chapter 67 / Pediatric Surgery 553

Yersinia enterocolitica

Increased WBC ( 10,000 per mm3 in90% of cases, with a left shift in most)

To evaluate for possible pyelonephritis or renal calculus, but mild hematuria and pyuria are common in appendicitis because of ureteral inflammation

What is the “hamburger”

Ask patients with suspected appendicitis

sign?

if they would like a hamburger or favorite

 

food; if they can eat, seriously question

 

the diagnosis

What radiographic studies

Often none; CXR to rule out RML or

may be performed?

RLL pneumonia; abdominal films are

 

usually nonspecific, but calcified fecalith

 

is present in 5% of cases; U/S to evaluate

 

for ovarian/gynecologic pathology

What is the treatment?

Nonperforated—prompt appendectomy

 

and cefoxitin to avoid perforation

 

Perforated—triple antibiotics,

 

fluid resuscitation, and prompt

 

appendectomy; all pus is drained and

 

cultures obtained, with postoperative

 

antibiotics continued for 5 to 7 days,

 

drain

How long should antibiotics

24 hours

be administered if

 

nonperforated?

 

How long if perforated?

Usually 5 to 7 days or until WBCs are

 

normal and patient is afebrile

If a normal appendix is

Meckel’s diverticulum, Crohn’s disease,

found upon exploration,

intussusception, gynecologic disease

what must be examined/

 

ruled out?

 

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