NUTRITIONAL-METABOLIC PATTERN & GASTROINTESTINAL DISORDERS Study Notes

NUTRITIONAL-METABOLIC PATTERN & GASTROINTESTINAL DISORDERS

Overview of the Digestive System

  • The digestive system comprises various organs that play critical roles in digestion, absorption, and elimination of food and waste.
  • Key organs include:
      - Parotid gland
      - Pharynx
      - Oral cavity (mouth)
      - Sublingual gland
      - Submandibular gland
      - Trachea
      - Esophagus
      - Diaphragm
      - Liver
      - Gallbladder
      - Common bile duct
      - Duodenum
      - Pancreatic duct
      - Ascending colon
      - Vermiform appendix
      - Stomach
      - Spleen
      - Pancreas
      - Transverse colon
      - Small intestine
      - Descending colon
      - Sigmoid colon
      - Rectum
      - Anus

Anatomy and Blood Supply of the Large Intestine

  • The blood supply to the large intestine is primarily from the:
      - Superior mesenteric artery
      - Inferior mesenteric artery

Functions of the Digestive Tract

  • Breakdown of Food for Digestion: The mechanical and chemical processes that reduce food into smaller components for absorption.
  • Absorption of Nutrients: Transport of digested nutrients, vitamins, and minerals through the intestinal walls into the bloodstream.
  • Elimination: The expulsion of undigested food and waste products from the body.

Key Terms

  • Digestion: The chemical breakdown of food where enzymes facilitate the breakdown of proteins, fats, and sugars into their respective molecules.
  • Absorption: The process where nutrients pass through the intestinal walls into circulation.
  • Elimination: The excretion of waste after digestion and absorption.

Major Enzymes and Secretions

  • Mastication and Swallowing: Saliva containing salivary amylase begins starch digestion.
  • Gastric Function: Secretion of hydrochloric acid, pepsin (enzyme for protein digestion), and intrinsic factor (necessary for vitamin B12 absorption).
  • Small Intestine Secretion: Enzymes like amylase, lipase, trypsin, and bile aid in digestion.

Anatomy of the GI Tract

  • Mouth: Where food is mechanically broken down and mixed with saliva for swallowing.
  • Esophagus: A conduit that transports food from the mouth to the stomach, passing through the diaphragm.
  • Stomach: A hollow organ that temporarily stores food, secretes digestive fluids, and churns food into chyme for intestinal transport.
  • Small Intestine: The longest segment of the GI tract, divided into three sections: 1) duodenum, 2) jejunum, and 3) ileum, responsible for secretion and absorption.
  • Cecum: The initial part of the large intestine where the appendix is attached.
  • Large Intestine: Comprising the ascending, transverse, descending, sigmoid colon, rectum, and anus; chiefly involved in water absorption.

Abdominal Quadrants and Associated Organs

  • Right Upper Quadrant (RUQ): Contains the liver (right lobe), gallbladder, part of the duodenum, and ascending colon.
  • Left Upper Quadrant (LUQ): Contains the stomach, spleen, part of the pancreas, and descending colon.
  • Right Lower Quadrant (RLQ): Contains the appendix and reproductive organs (in females).
  • Left Lower Quadrant (LLQ): Contains parts of the large intestine and reproductive organs.

Abdominal and GI Assessment

  • Health History: Involves inquiry into past surgeries, family history of GI diseases, dietary habits, substance use (alcohol, tobacco), weight fluctuations, symptoms of gastrointestinal distress such as abdominal pain, heartburn, bloating, and stool characteristics.
  • Physical Examination Techniques:
      - Inspection
      - Auscultation
      - Percussion
      - Palpation (start at LLQ)

GI Diagnostic Tests

  • Various diagnostic procedures include:
      - Stool specimens for occult blood and pathogens.
      - Breath tests to assess carbohydrate absorption.
      - Abdominal ultrasonography for organ structure examination.
      - Imaging studies: CT scans, PET scans, MRIs, scintigraphy for functional studies, and endoscopic procedures for direct visualization.
Esophagogastroduodenoscopy (EGD)
  • A procedure that facilitates direct visualization of the esophagus, stomach, and duodenum to evaluate motility, structural abnormalities, and possible tumors, including biopsy options. Client must be NPO for at least 8 hours prior and may require sedatives and local anesthetics.
Colonoscopy
  • A procedure to visualize the large intestine using a flexible scope. Used for screening cancer, evaluating bowel health, and obtaining biopsies. Preparation may include laxatives or special solutions.

Gastrointestinal Intubation Purposes

  • To decompress the stomach, perform lavage, diagnose disorders, deliver medications/feeding, and aspirate gastric contents.

Enteral Feeding Methods

  • Nasogastric Tube (NG Tube): Flexible tube placed through the nostril into the stomach for short-term feeding in patients who cannot eat by mouth.
  • Gastrostomy Tube (G-Tube): Tube surgically placed in the stomach wall for long-term feeding solutions.
  • Jejunostomy Tube (J-Tube): Placed in the upper section of the small intestine for direct feeding.

Enteral Formula Types

  • Standard Formulas: Complete, balanced, generally suitable for patients with normal digestion.
  • Semi-elemental Formulas: Partially broken down for easier absorption.
  • Disease-specific Formulas: Tailored nutritional needs for conditions such as renal disease or diabetes.

Tube Feeding Administration Methods

  • This includes nasogastric and gastrostomy tubes, and methods like intermittent bolus feedings, continuous infusion, and cyclic feeding.

Maintaining Bowel Elimination

  • Assessment of tube feeding formulas for fiber content, disease prevention, and management of diarrhea.
  • Slow administration is vital to prevent dumping syndrome; formulas should be at room temperature.

Parenteral Nutrition (PN)

  • Indicated for individuals unable to meet nutritional needs via enteral feeding or with compromised intestinal function, administered through the intravenous route.

Disorders of the Teeth and Mouth

  • Dental Plaque, Caries, and Abscesses: Common oral health issues.
  • Gingivitis and Periodontal Disease: Associated with several risks including genetics, lifestyle factors.

Promotion of Oral Health

  • Effective oral care routines such as proper brushing and flossing, nutritional management, controlling diabetes, and regular dental check-ups are essential.

Gastrointestinal Disorders

  • Constipation: Often related to diet, medication, lifestyle factors; identified by infrequent bowel movements and symptoms such as pain and bloating.
  • Diarrhea: Increased frequency and looseness of stools with potential for dehydration.
  • Ulcerative Colitis and Crohn’s Disease: Both types present with abdominal pain, diarrhea, and require specific therapeutic approaches.

Conclusion: Nutritional and Metabolic Significance

  • With aging, physiological changes affect the digestive system’s efficiency leading to potential malnutrition. Regular assessments and dietary modifications can mitigate adverse outcomes and improve quality of life.