chapter 7 part 3

Anoxia and Hypoxia

Anoxia: Absence of oxygen in the body’s tissues despite adequate blood flow.

  • Components:

    • "N" → without

    • "Ox" → oxygen

    • "-ia" → abnormal condition

  • Consequences: Prolonged anoxia (more than 4-6 minutes) can lead to irreversible brain damage.

Hypoxia: Deficiency of oxygen levels in the body’s tissues and organs.

  • Components:

    • "Hip" → deficient

    • "Ox" → oxygen

    • "-emia" → blood condition

  • Causes: Trauma, lung diseases, cardiovascular issues, carbon monoxide poisoning, high altitudes.

Altitude Sickness

Definition: A condition caused by lower air pressure and decreased oxygen levels at high altitudes (above 8,000 feet).

  • Severe altitude sickness can result in high altitude pulmonary edema, which is life-threatening and requires immediate intervention.

Asphyxia

Definition: Loss of consciousness due to inadequate oxygen.

  • Causes: Choking, suffocation, drowning, inhalation of harmful gases (e.g. carbon monoxide).

  • Asphyxiation: A state of asphyxia where oxygen levels drop fast, leading to potential death or serious brain damage if not addressed within minutes.

Carbon Monoxide Poisoning

Description: Fatal condition caused by exposure to high levels of carbon monoxide (CO) from poorly vented heaters or fire.

  • Symptoms: Nausea, dizziness, headaches, confusion, shortness of breath.

  • Treatment: Oxygen therapy including hyperbaric oxygen therapy.

Cyanosis and Hypercapnia

Cyanosis: Bluish discoloration of skin/mucous membranes due to low oxygen.

  • Components:

    • "Cyan" → blue

    • "-osis" → abnormal condition.

Hypercapnia: Abnormal buildup of carbon dioxide in the blood.

  • Symptoms: More common in respiratory disorders (COPD, sleep apnea).

Hypoxemia

Definition: Low oxygen levels in the blood, often due to respiratory or heart disorders.

  • Components:

    • "Hip" → deficient

    • "Ox" → oxygen

    • "-emia" → blood

Respiratory Failure

Definition: Abnormally low oxygen or elevated carbon dioxide levels in the blood, requiring urgent treatment.

  • Common Causes: Chronic obstructive pulmonary disease (COPD), asthma, pneumonia, and other severe lung conditions may lead to respiratory failure, often manifesting as elevated respiratory rates and effort.

Smoke Inhalation

Description: Damage and burns to lungs from breathing hot smoke containing harmful combustion products including CO.

Sudden Infant Death Syndrome (SIDS)

Definition: Unexpected death of a healthy infant during sleep, typically between 1 month - 1 year.

  • Preventive measures: Recommendations for safe sleep practices greatly reduced SIDS incidences.

Diagnostic Procedures in the Respiratory System

  • Respiratory Rate: Count of breaths per minute, an important vital sign.

  • Bronchoscopy: Visual examination of bronchi using a bronchoscope for diagnostics or operative procedures.

  • X-ray: Tool for diagnosing pneumonia, lung cancer, pneumothorax, encasement conditions.

  • Laryngoscopy: Examination of the larynx/vocal cords with a laryngoscope.

  • Peak Flow Meter: Device for asthma patients to measure airflow, indicating airway narrowing.

  • Polysomnography: Measures physiological activity during sleep, useful for detecting sleep apnea.

  • Pulmonary Function Tests (PFTs): Assess air volume and flow using a spirometer, according to individual norms.

Types of Tests and Their Functions

  • Sputum Cytology: Examining mucus for cancer cells.

  • Sputum Culture: Evaluating mucus for bacterial growth and resistance to antibiotics.

  • Tuberculosis Testing: TB skin tests and blood tests to detect infection, not necessarily active disease.

Treatment Procedures

  • Medications: Antitussives, decongestants, expectorants, bronchodilators for managing respiratory conditions.

  • Ventilation Devices: CPAP and BiPAP machines for sleep apnea, bag valve masks for emergency ventilation, ventilators for artificial respiration.

  • Oxygen Therapy: Administering supplemental oxygen via nasal cannula, rebreather/mask for high oxygen levels, and hyperbaric oxygen therapy for enhanced oxygen absorption during treatment.

Surgical Procedures in the Respiratory System

  • Tracheostomy: Surgical creation of an opening in the trachea for breathing.

  • Lung and Thoracic Surgery: Procedures including pneumonectomy, lobectomy, wedge resection, thoracentesis, thoracotomy.

  • Video-Assisted Thoracic Surgery: Minimally invasive procedure to diagnose and treat chest conditions.

Summary of Respiratory Diseases and Conditions

Respiratory diseases, including COPD, asthma, pneumonia, and interstitial lung diseases, significantly impact oxygen transport and may complicate conditions like hypoxia and anoxia.

  • Chronic Obstructive Pulmonary Disease (COPD): Characterized by progressive airflow limitation, primarily due to smoking or exposure to pollutants, leading to chronic respiratory insufficiency.

  • Asthma: A chronic inflammatory disease of the airways which significantly contributes to respiratory problems; exacerbated by allergens and irritants.

  • Pneumonia: An infection of the alveoli which may lead to significant consolidation and marked reduction in gas exchange efficiency.

  • Interstitial Lung Diseases: A group of disorders causing progressive scarring of lung tissue, ultimately leading to respiratory failure and anoxia.