[08.04] PED - Obstruction in Children V2.1.pdf

Infant is not a miniature adult

Which fundamental principle states that principles of adult physiology do not apply to pediatric patients?

8 hours

What is the duration of a physiologic day in pediatric care, dictating the frequency of monitoring and re-evaluation?

Thin line between dehydration and fluid overload

Why must IV fluid infusion rates be monitored with extreme care in infants?

85 mL/kg body weight

What is the normal total blood volume per kilogram of body weight in an infant?

Growth and healing

What is the primary physiological purpose of nutrition in pediatric patients?

Impaired thermoregulation

Why do infants fail to tolerate cold environments and require wrapping to prevent hypothermia?

Cardiac arrest or shock

What life-threatening systemic collapse can occur if a neonate becomes severely hypothermic?

Crying

What is the primary behavioral language through which neonates express pain?

Analgesics

What class of medications should be administered to neonates when experiencing pain?

3 to 3.5 mm

What is the normal inner diameter of an infant's narrow airway?

Mucus

What physiological substance can easily occlude an infant's narrow airway?

Appropriate tube size

What structural precaution must be taken when placing suction catheters, NGTs, or OGTs in pediatric airways or GI tracts?

65 mL/kg

What is the baseline fluid requirement for an infant at birth?

100 mL/kg

What is the fluid requirement for an infant after one week of life?

100 mL/kg for first 10 kg + 50 mL/kg for second 10 kg + 25 mL/kg for each kg thereafter

What is the formula for calculating daily maintenance fluids based on body weight in kilograms?

4 mL/kg/hr up to 10 kg + 2 mL/kg/hr for 11-20 kg + 1 mL/kg/hr thereafter

What is the formula for calculating hourly maintenance fluid infusion rates in pediatric patients?

Vomiting, abdominal distention/pain, passage of abnormal meconium/stool, and visible/palpable lesions

What are the four common chief complaints that suggest a surgical pediatric GI problem?

Blueberry-looking stool

What visual appearance can abnormal meconium-like stool exhibit in neonates?

Bilious (bile-stained), bloody, projectile, and persistent

What are the four clinically significant types of vomiting indicating a potential surgical pathology in infants?

Bilious vomiting

Which type of vomiting presents with green-colored material originating from the duodenum distal to the ampulla of Vater?

Intestinal obstruction distal to the duodenum

What structural GI issue is signaled by bilious vomit in a neonate?

Black or very red

How does bloody vomitus present visually in infants?

Projectile vomiting

Which pattern of vomiting is characterized by gastric contents forcefully exiting the mouth over a significant distance?

Persistent vomiting

Which pattern of vomiting recurs throughout the day and prompts caregivers to stop feeding the infant?

Aspiration

What is the most immediate, fatal risk associated with infant vomiting?

Turning blue (cyanosis), then black, leading to death within seconds

What rapid clinical sequence occurs when an infant aspirates vomitus?

Draining or emptying the stomach using an OGT or NGT

How is aspiration prevented in an infant presenting with severe vomiting?

Orogastric tube (OGT)

Which tube insertion route is preferred in infants because they are obligate nose-breathers?

Lateral decubitus or prone position

What is the proper positioning for an infant during an episode of active vomiting?

Lifting or sitting up the infant

What positioning maneuver is strictly prohibited during infant aspiration?

Globular or protuberant

What is the normal anatomical contour of an infant's abdomen?

Movement on inspiration, peristaltic waves, engorged superficial veins, and scaphoid or distended shape

What four visual parameters should be systematically observed during abdominal inspection in an infant?

Thin abdominal wall combined with abdominal distension and venous congestion

What physiological factors cause engorged superficial abdominal veins in infants?

90%

What percentage of life-threatening congenital birth defects can be detected prenatally?

Ultrasound, amniocentesis, and maternal serum AFP

What three prenatal screening modalities detect the majority of life-threatening fetal anomalies?

Polyhydramnios

What term defines an excessive accumulation of amniotic fluid carried by the pregnant mother?

Oligohydramnios

What term defines an abnormally low volume of amniotic fluid during pregnancy?

Lymphatic malformations, abdominal wall defects, scrotal enlargement, sacrococcygeal teratomas, and imperforate anus

Which visible congenital lesions can be diagnosed visually from head to toe on a fully disrobed infant?

Macrocystic Lymphatic Malformation

What is the updated medical term for the congenital lesion previously known as Cystic Hygroma or Lymphangioma?

Impeding swallowing and breathing via intraesophageal extension

Why does a macrocystic lymphatic malformation pose a serious clinical threat to an infant?

Microcystic lymphatic malformation

What is the smaller counterpart of a macrocystic lymphatic malformation called?

Scaphoid abdomen

What term describes an abnormally sunken or concave anterior abdominal wall in a newborn?

Underfeeding and Congenital Diaphragmatic Hernia (CDH)

What are the two main causes of a scaphoid abdomen in a newborn?

Chest examination

What non-abdominal anatomical exam is mandatory when evaluating a newborn with a scaphoid abdomen?

Peristaltic waves

What physical finding presents as a moving abdominal mass described as rolling ("gumugulong") across the left upper quadrant?

Diminished bowel sounds

What auscultatory finding indicates peritonitis, an eviscerated head, or intra-abdominal infection?

High-pitched bowel sounds

What auscultatory finding indicates hyperperistalsis struggling against an intestinal obstruction?

Pressing the stethoscope lightly on the abdomen and watching for squirming

How can an examiner detect abdominal tenderness in a crying infant using a physical exam tool?

4 quadrants and 9 regions

What structural division systems should guide palpation and auscultation of the abdomen?

Tympanism

What percussion finding on gentle palpation signifies gas accumulation within distended bowel loops?

Guarding / Peritoneal hardening

What involuntary abdominal wall muscle contraction occurs when an infant experiences abdominal tenderness?

16 to 24 hours

Within how many hours after birth should normal meconium passage or a fistula be identified?

Fistula

What term describes an ectopic, abnormal epithelial tract through which meconium passes, such as along the scrotal median raphe?

Median raphe of the scrotum

Where is a low perineal fistula commonly identified in a male neonate with an imperforate anus?

Plain X-ray (Cross-table lateral)

What diagnostic test should be ordered if no meconium or fistula is seen within 16 to 24 hours after birth?

16 to 24 hours

How long does it take for swallowed air in a normal newborn to travel through the GI tract and reach the rectum?

Invertogram

Which historical radiologic technique involved positioning the baby upside down to allow air to rise to the rectum?

Transient cyanosis ("mangitim")

What major clinical risk was associated with holding an infant upside down during an invertogram?

Cross-table lateral X-ray

What modern, comfortable radiographic view places the baby prone with elevated buttocks to evaluate imperforate anus?

Anal dimple radiopaque marker

What anatomical marker is placed on the infant's skin to measure distance to the distal rectal pouch on cross-table X-ray?

Delayed passage >24 hours, non-passage, or abnormal brown/malodorous/whitish/mucoid stool

What three clinical patterns characterize abnormal meconium passage?

Proliferation and multiplication of stagnant colonic bacteria turning pathogenic

Why does delayed meconium passage lead to abnormal-looking and foul-smelling stool?

Rectal washout

What non-surgical procedure involves inserting a catheter and flushing isotonic saline to evacuate retained stool in an infant with an intact anus?

Esophageal Atresia (EA), Tracheoesophageal Fistula (TEF), Congenital Diaphragmatic Hernia (CDH), and Situs Inversus

What four fetal structural anomalies cause a missing gastric bubble on prenatal ultrasound?

Esophageal Atresia and Gastrointestinal Obstruction

What GI conditions account for 13% of fetal polyhydramnios cases?

Renal agenesis and polycystic kidneys

What renal parenchymal abnormalities cause fetal oligohydramnios?

UPJ obstruction, megaureter, and posterior urethral valves

What post-renal obstructive uropathies cause fetal oligohydramnios?

Congenital Diaphragmatic Hernia (CDH)

What fetal pulmonary condition is assessed using the Lung to Head Ratio (LHR) on prenatal ultrasound?

Congenital Cystic Adenomatoid Malformation (CCAM) and Sacrococcygeal Teratoma (SCT)

What two structural pathologies lead to fetal hydrops fetalis?

Plain X-ray (chest/abdomen), contrast studies, and ultrasound

What are the core diagnostic imaging modalities used for pediatric GI obstruction?

Babygram

What radiographic procedure captures an image of the entire newborn from head to extremities on a single plate?

Thorax and abdomen congenital defects

Which body regions contain immediately life-threatening congenital defects evaluated on a babygram?

Whole abdomen full of air and gas lucencies

What is the normal flat plate radiographic appearance of an infant's abdomen?

Presacral air

What is the single most critical plain lateral radiologic feature for diagnosing intestinal obstruction in children under 2 years old?

Segmental in infants versus fused single bone in adults

How does sacral skeletal anatomy on X-ray differ between infants and adults?

Normal bowel transit / Absence of mechanical obstruction

What does the presence of presacral air indicate on a lateral abdominal radiograph of an infant?

Intestinal obstruction

What does the total absence of presacral air indicate on a lateral abdominal radiograph of an infant?

Haustrations

What anatomical feature of the large intestine distinguishes it from small intestine, though less developed in infants?

Contrast enema

What imaging study is required to differentiate small intestine from small-caliber colon when haustrations are undeveloped?

Microcolon

What term describes a colon that appears abnormally small or narrow in caliber due to disuse on contrast enema?

Small bowel obstruction (such as intestinal atresia)

What functional or structural situation causes a microcolon in a newborn?

Intestinal atresia

What congenital anomaly should be immediately suspected upon demonstrating a microcolon on contrast enema?

Small intestine and mesenteric blood supply

What structural components can be involved in various types of intestinal atresia?

Massive bowel resection

What surgical procedure is necessitated by extensive intestinal atresia?

Bilious vomiting with a flat or scaphoid abdomen

What classic combination of signs in a neonate strongly suggests duodenal obstruction?

Decompression of the stomach by bilious vomiting

Why is the abdomen minimally distended or flat in a neonate with high duodenal obstruction?

Double bubble sign

What characteristic radiographic pattern on a plain scout film indicates duodenal obstruction?

Malrotation, duodenal atresia, and annular pancreas

What are the three potential causes of duodenal obstruction indicated by a double bubble sign, listed in order of frequency?

Beak sign

What upper GI series finding describes a smooth, tapered obstruction of the distal duodenum?

Sudden cutoff sign and Whirlpool sign

What two sonographic features on transverse ultrasound indicate malrotation with midgut volvulus?

Superior Mesenteric Artery (SMA) located to the left of the thoracic vertebra and left of SMV

What is the normal anatomical relationship between the Superior Mesenteric Artery and Superior Mesenteric Vein?

Inversion of SMA and SMV positions

What vascular orientation anomaly is visualized on abdominal ultrasound in intestinal malrotation?

Corkscrew appearance

What upper GI series finding depicts a twisted, spiral path of the obstructed duodenum in midgut volvulus?

Midgut volvulus causing vascular compromise

What is the most catastrophic, gut-threatening complication of intestinal malrotation?

High-lying cecum

What contrast enema finding demonstrates an abnormally positioned cecum in the upper abdomen near the midline?

Duodeno-jejunal junction on the left, cecum in the right lower quadrant, and a wide mesenteric base

What three anatomical features define normal intestinal rotation and fixation?

Duodeno-jejunal junction on the right, high-lying cecum, and narrow mesenteric base

How are normal intestinal relationships altered in malrotation?

Ladd's bands

What fibrous peritoneal bands extend from an abnormally placed cecum across the duodenum, causing extrinsic compression?

Surgical division/release of Ladd's bands

What surgical intervention relieves extrinsic duodenal compression in malrotation?

Duodenal bypass procedure (duodenoduodenostomy)

What surgical approach is used for annular pancreas to avoid transecting pancreatic tissue or ducts?