Digestive

Concept Learning Outcomes

• Physiological Analysis: Analyze the physiology of digestion within the human body.

• Differentiation of Alterations: Identify and differentiate various alterations in digestion.

• Inter-concept Relationships: Outline how digestion relates to other clinical concepts.

• Health Promotion: Explain methods for promoting healthy digestive function.

• Assessment and Diagnostic Procedures: Differentiate common assessment procedures and diagnostic tests used to examine the digestive system.

• Independent Nursing Interventions: Analyze specific interventions that nurses can implement independently for individuals experiencing alterations in digestion.

• Collaborative Therapy Summarization: Summarize therapies utilized by interprofessional teams, including pharmacologic and nutritional support.

• Lifespan Considerations: Differentiate considerations for the assessment and care of patients across the lifespan, from infants to older adults.

Understanding the Concept of Digestion

• Definition: Digestion is the conversion of food into absorbable substances within the gastrointestinal (GI) tract.

• Mechanisms of Breakdown:

  • Mechanical Breakdown: Physical processing of food (e.g., chewing, churning).

  • Chemical Breakdown: Enzymatic and chemical decomposition of food into smaller molecules.

  • Support Structures: Breakdown is aided by various glands located both inside and outside the stomach.

Normal Digestion and Anatomy

• Primary Digestive System Organs:

  • Mouth

  • Pharynx

  • Esophagus

  • Stomach

  • Small intestine

  • Large intestine

• Accessory Organs:

  • Liver

  • Gallbladder

  • Pancreas

• Nutrients: Defined as substances found in food that the body utilizes to promote growth, maintenance, and repair.

• Digestive Enzymes: Specialized proteins that assist in the chemical digestion of nutrients.

Alterations in Digestion

• Motility:

  • Process: The movement of food and fluid through the GI tract from the mouth to the anus.

  • Regulation: The autonomic nervous system (ANS) regulates the rate and strength of motility.

  • Interruptions: Disorders occur when the GI muscles are interrupted.

  • Influencing Factors: Food intake and the presence of bacteria affect the number and consistency of stools.

  • Impactors of Motility: Motility can be negatively affected by stress, postponement of defecation, Gastroesophageal Reflux Disease (GERD), impaired esophageal motility, pyloric stenosis, diarrhea, constipation, Irritable Bowel Syndrome (IBS), and encopresis.

• Absorption:

  • Process: The movement of nutrients and fluid from the external environment (inside the GI tract) to the internal environment (inside the body).

  • Mechanisms: Absorption occurs via active transport and diffusion.

  • Hinderances: Various medical or surgical conditions can significantly hinder the body's ability to absorb nutrients.

Clinical Manifestations of Digestive Alterations

• Nausea and vomiting

• Anorexia (loss of appetite)

• Gastroesophageal reflux disease (GERD)

• Hepatitis

• Malabsorption and Maldigestion

• Pancreatitis

• Pyloric stenosis

Prevalence and Statistics

• Common Symptoms: Nausea, vomiting, and diarrhea are common clinical presentations across all age groups.

• GERD: Approximately $30\%$ of the United States population experiences weekly symptoms of GERD.

• Hepatitis Prevalence: The prevalence varies by type, ordered from least to most common: Hepatitis A < Hepatitis B < Hepatitis C.

• Chronic Hepatitis: Between $2.7 \text{ -- } 3.9 \text{ million}$ people are currently living with chronic hepatitis.

Genetic Considerations and Risk Factors

• Early Intervention: Identifying risk factors early leads to more effective disease prevention and intervention.

• Crohn Disease: Linked to specific gene and chromosomal alterations.

• Genetic Roles: Genetics may play a role in several conditions, including:

  • GERD

  • Pyloric stenosis

  • Celiac disease

  • Pancreatitis

Concepts Related to Digestion

• Development

• Elimination

• Fluids and Electrolytes

• Metabolism

• Nutrition

• Self

Health Promotion and Risk Management

• Lifestyle Choices: Health promotion focuses on lifestyle management and specific dietary choices.

• General Health Support: Consuming foods that support overall health and maintaining adequate water consumption.

• Food Safety: Ensuring safe storage and preparation of both food and beverages.

• Elimination Patterns: Supporting healthy elimination habits.

• Risk Factor Mitigation: Identifying and minimizing modifiable risk factors.

• Modifiable Risk Factors: Primarily involve personal lifestyle choices.

• Screenings:

  • Blood tests for early diagnosis and treatment.

  • Specific screenings for Hepatitis.

Care in the Community

• Nausea Management:

  • Consumption of bland foods.

  • Eating small, frequent meals throughout the day.

  • Adhering to the BRAT diet (Bananas, Rice, Applesauce, Toast).

  • Hydration with water, sports drinks, or Nursery water.

• Heartburn Management:

  • Use of Over-the-counter (OTC) antacids and acid reducers.

  • Decreasing physical pressure on the abdomen.

  • Avoiding food intake immediately before going to bed.

  • Avoiding triggers such as spicy foods, acidic foods, and cigarettes.

Nursing Assessment

• Overview: A thorough assessment is required to identify the underlying cause of symptoms. For nausea and vomiting, nurses must rule out systemic diseases or acute illnesses while focusing on comfort and complication prevention.

• Observation and Interview:

  • Health history recording.

  • Identifying changes in appetite, weight, bowel habits, flatulence, and pain.

  • Evaluating GI system function.

  • Considering demographics: Age, gender, race, and culture.

  • Environmental factors and health practices.

  • Reviewing current therapies in use.

• Physical Assessment Components:

  • Inspection

  • Auscultation

  • Percussion

  • Palpation

  • Constant assessment for signs of malnutrition throughout the physical exam.

Diagnostic Tests

• Upper GI Series: Also known as a barium swallow.

• Endoscopy: Visual examination of the internal GI structures.

• Imaging: Abdominal x-rays and CT scans.

• Laboratory Markers: Measuring levels of Amylase and Lipase.

Nursing and Collaborative Interventions

• Independent Nursing Interventions:

  • Monitoring and implementing early interventions.

  • Ongoing assessment of pain.

  • Managing self-limiting cases of nausea and vomiting.

  • Identifying individuals with specific digestive concerns.

  • Promoting fluid and electrolyte balance.

  • Providing comprehensive client education.

• Pharmacologic Therapy:

  • Antacids and acid reducers.

  • Antidiarrheals.

  • Antiemetics.

  • Antagonists (such as $H_2$ receptor blockers).

  • Laxatives.

  • Promotility agents.

  • Proton pump inhibitors (PPIs).

• Nutrition Therapy:

  • Adoption of a healthy diet, such as a Mediterranean-style eating pattern.

  • Diet modifications tailored to symptoms and the specific treatment plan.

  • Supplemental nutrition.

  • Enteral Nutrition: Feeding directly into the GI tract via tube feeding.

  • Total Parenteral Nutrition (TPN): Intravenous administration of nutrients.

• Nonpharmacologic Therapy:

  • Often used in conjunction with pharmacologic and nutritional therapies.

  • Lifestyle Changes: Increasing consumption of fruits, vegetables, and fiber; increasing physical exercise.

  • Complementary Approaches: Use of Probiotics.

Lifespan Considerations

• Infants and Children:

  • Swallowing: Voluntary control over swallowing develops around $6 \text{ weeks}$ of age.

  • Capacity: Newborns have small stomach capacities, requiring frequent feedings.

  • Enzymatic Deficiency: Infants are often deficient in amylase, lipase, and trypsin, leading to frequent abdominal distention and flatulence.

  • Schedule: By age $2 \text{ years}$, a child can typically adapt to a standard meal schedule.

  • Common Issues: Gas, constipation, diarrhea, and vomiting.

  • Functional GI Disorders: Include functional abdominal pain, functional dyspepsia, and IBS; these are treated with medication and diet changes.

  • Eosinophilic Esophagitis: Requires specific parental education and management.

• Adolescents:

  • Demands: Growth spurts significantly increase the demand for calories and specific nutrients.

  • Consequences of Malabsorption: Inability to absorb nutrients can lead to slow growth, short stature, delayed puberty, and muscle wasting.

  • Health Education: Focus on making healthy food/drink choices and discouraging dieting or skipping meals.

• Pregnant Women:

  • Requirements: Changing nutritional requirements.

  • Symptoms: Increased incidence of nausea and vomiting.

  • Constipation: Caused by hormonal changes and the relaxation of bowel muscles.

  • Heartburn Management: Eating multiple small meals; avoiding spicy, fatty, or greasy foods. Severe cases may require medication.

• Older Adults:

  • Metabolic Shift: Decreases in lean body mass and metabolic rate result in lower overall nutritional requirements.

  • GI Changes: Leads to constipation, decreased nutrient absorption, and increased time required for elimination.

  • Increased Risk: Higher susceptibility to diverticular disease and gallstones.

  • Wellness Promotion: Emphasis on a healthy diet, regular exercise, and stress reduction strategies.