Gastrointestinal Disorders and Anatomy Notes

Gastrointestinal Anatomy and Disorders

Major Structures:
- Small Intestine: Site of primary digestion, particularly in the duodenum.
- Large Intestine: Comprises segments including the rectum and colon (ascending, transverse, descending, and sigmoid).
- Stomach: Contains internal structures such as the cardiac sphincter and pyloric sphincter which control the passage of food.
- Associated Organs: Includes the pancreas (produces digestive enzymes), liver (hepatic ducts), and gallbladder.

Enzymes: Assist in the digestion process, particularly within the duodenum where most digestion occurs.

Definition: Cleft lip and/or cleft palate result from the failure of maxillary processes to fuse between 5-12 weeks of gestation.
Causes: Multifactorial, including steroid use during pregnancy.
Types:
- Unilateral and Bilateral clefting.
Nursing Care:
- Pre-operative: Manage imbalanced nutrition, risk for aspiration.
- Post-operative: Monitoring for feeding difficulties and speech development.
- Feeding techniques often require special cups or bottles to prevent aspiration.
Complications: Speech difficulties, chronic otitis media (ear infections), dental issues.

Definition:
- Esophageal Atresia: Congenital defect where the esophagus ends in a blind pouch.
- TEF: Abnormal connection (fistula) between the esophagus and trachea.
Pathophysiology: Develops during the first trimester (4-5 weeks of gestation) and may lead to associated complications such as polyhydramnios.
Manifestations:
- Signs include excessive drooling, cyanosis, coughing, choking, and respiratory distress.
Nursing Care:
- Pre-operative management focuses on suctioning, and maintaining airway integrity.
- Care for gastrostomy tubes if necessary.
Diagnosis: Involves passing an NGT (nasogastric tube) into the stomach.

Definition: Narrowing (stenosis) of the pylorus, preventing passage from stomach to duodenum.
Symptoms: Projectile vomiting, persistent hunger, dehydration, lethargy, and failure to gain weight.
Diagnosis: Ultrasound imaging.
Nursing Care:
- Pre-operative: Ensure fluid and electrolyte balance.
Etiology: Most commonly affects first-born males.

Definition: Telescoping of one segment of the intestine into another, causing obstruction.
Symptoms: Severe, episodic abdominal pain, currant jelly stools (blood and mucus), abdominal mass.
Management: Barium enema may be both diagnostic and therapeutic.
Etiology: Multifactorial, sometimes associated with viral infections like measles.

Gastroschisis: Protrusion of intestines through an opening in the abdominal wall to the right of the umbilical cord.
Omphalocele: Intestines are covered by a membrane and located at the umbilical cord.
Timing: Typically occurs by the eleventh week of gestation.

Types: Anal stenosis, atresia (imperforate anus).
Management: Require surgical intervention, often temporary colostomy followed by corrective surgery.

Definition: Pathologic reflux of stomach contents into the esophagus causing symptoms and complications.
Symptoms: Irritability, poor feeding, recurrent vomiting, and respiratory symptoms (e.g., cough, wheezing).
Management:
- Nutritional adjustments (e.g., adding rice cereal for thickening), anti-reflux medications, or surgical options for severe cases.

Definition: Constipation involves infrequent bowel movements or hard stools; encopresis is inappropriate defecation following constipation.
Management: Adequate hydration, dietary modifications, and medication (e.g., laxatives).

Definition: Congenital absence of ganglion cells (neurons) in the rectum and colon, leading to obstruction.
Symptoms: Ribbon-like stools, vomiting, abdominal distension.
Diagnosis: Radiographic barium enema studies; surgical intervention may be required.

Definition: Inflammation of the gastrointestinal tract, leading to diarrhea and vomiting.
Causes: Viruses, bacteria, or parasites.
Nursing Care: Fluid management, monitoring for dehydration, and maintaining nutrition.