oxygenation

Steps of Oxygenation

  • Oxygenation Process: Three essential steps in the oxygenation process include:

    • Ventilation (Breathing): The act of inhaling and exhaling air.

    • External Respiration: The gas exchange occurring between the alveoli in the lungs and the blood in the capillaries.

    • Circulation: The movement of blood through the heart and blood vessels.

    • Perfusion (Internal Respiration): The gas exchange between the bloodstream and the tissues, delivering oxygen and removing carbon dioxide.

Ventilation Regulation

  • Primary Stimulus for Breathing: The level of carbon dioxide (CO2) in the blood primarily stimulates breathing. However, this is modified in individuals with chronic obstructive pulmonary disease (COPD), where the body relies more on oxygen levels to regulate breathing.

Assessment

Subjective Assessment

  • Patient Reports:

    • Focus on what the patient expresses regarding their respiratory status, including symptoms and feelings.

  • Key Aspects to Consider:

    • Asthma/allergies history.

    • Recent respiratory symptoms.

    • Family history of respiratory issues, including cancer.

    • Occupational and environmental factors influencing respiratory health.

    • Home environment: presence of dust, pollen, and mold.

    • Smoking habits and lifestyle choices affecting respiratory health.

    • Patient's exercise routine.

Objective Assessment

  • Observational Findings:

    • Look for signs of respiratory distress such as:

    • Increased respiratory rate and depth.

    • Use of accessory muscles for breathing.

    • Positioning (e.g., tripod position).

    • Level of consciousness and behavior (restlessness, anxiety).

    • Drooling (particularly concerning in cases like epiglottitis).

    • Symmetry and movement of the chest during respiration.

    • Characteristics of cough (e.g., productive, dry - observe color, odor, consistency).

    • Communication patterns (e.g., speaking in short sentences).

    • Skin appearance (e.g., signs of cyanosis).

Hypoxia vs. Hypoxemia

  • Definitions:

    • Hypoxia: A condition where the body or a region of the body is deprived of adequate oxygen supply.

    • Hypoxemia: A specific form of hypoxia that refers to low levels of oxygen in the blood.

Signs of Hypoxemia (Labs)

  • Decreased SpO2 (oxygen saturation).

  • Decreased hemoglobin and hematocrit levels.

  • Decreased arterial oxygen levels.

  • Increased arterial CO2 levels (hypercapnia).

Signs of Hypoxia

  • Skin and mucous membrane changes (e.g., cyanosis, dryness).

  • Delayed capillary refill time.

  • Potential organ failure.

  • Increased respiratory rate and depth.

  • Increased work of breathing.

Cyanosis

  • Description: Cyanosis is characterized by bluish discoloration of the skin, lips, and/or nail beds, indicating insufficient oxygenation of the blood.

Signs Indicating Both Hypoxemia and Hypoxia

  • Increased respiratory rate and work of breathing, observed as:

    • Retractions (sinking of the chest wall during inhalation).

    • Use of accessory muscles for breathing.

    • Grunting sounds during breathing efforts.

    • Nasal flaring.

    • Frequent position changes (e.g., adopting tripod position).

Use of Accessory Muscles and Retractions

  • Engagement of muscles not primarily involved in normal respiration, including:

    • Scalenus

    • Trapezius

    • Sternomastoid

Cough Assessment

Subjective Assessment

  • Cough Characteristics:

    • Determine if the cough is dry, productive, or hacking.

    • Assess frequency and triggers (aggravating/alleviating factors).

Objective Assessment

  • Characteristics of Cough:

    • Sound characteristics upon auscultation.

    • Sputum characteristics: analyze color, consistency, and odor.

Respiratory Assessment – Breath Sounds

  • Types of Breath Sounds:

    • Normal breath sounds: Clear upon auscultation, indicating proper airflow.

    • Abnormal Breath Sounds:

    • Crackles (Rales):

      • Fine: High-pitched popping sounds heard, often due to fluid in the lungs.

      • Coarse: Lower-pitched bubbling sounds.

    • Ronchi:

      • Gurgling sounds caused by secretions in the lower airways; sometimes clear with coughing/suctioning.

    • Wheezing:

      • Musical sounds produced by air passing through partially obstructed small airways; indicates obstruction.

      • Common causes include asthma, pneumonia, and bronchiolitis.

    • Stridor:

      • High-pitched, harsh sound during inhalation/exhalation, indicating obstruction in the upper airways.

Respiratory Patterns

  • Normal and Abnormal Breathing Rates:

    • Eupnea: Normal breathing rate (12-20 respirations per minute).

    • Tachypnea: Rapid breathing rate (>20 rpm).

    • Bradypnea: Slow breathing rate (<12 rpm).

    • Kussmaul’s Respirations: Abnormal deep and rapid breaths, often seen with metabolic acidosis.

    • Biot’s Respirations: Irregular patterns, varying depth, with periods of apnea.

    • Cheyne-Stokes Respirations: Cycle of gradual increase and decrease in respiration depth, with periods of apnea; common in dying patients.

Common Respiratory Illnesses

  • Categories of Respiratory Illnesses:

    • Chronic Obstructive Pulmonary Disorder (COPD)

    • Asthma

    • Common cold (rhinovirus)

    • Influenza

    • Lung cancer

    • Sleep apnea

Atelectasis

  • Definition: Refers to the collapse of alveoli in the lungs.

  • Causes:

    • Prolonged bed rest without position changes.

    • Surgical procedures.

    • Mucous plugs obstructing airways.

    • Foreign bodies in the airway.

Preventing Atelectasis

  • Preventive Measures:

    • Encourage deep breathing techniques.

    • Utilize incentive spirometry to keep airways open.

  • Incentive Spirometer Use: Aim to keep an indicator between specified markers to ensure effective lung expansion.

Pneumonia

  • Definition: Involves lower respiratory tract infection affecting the alveoli.

  • Types:

    • Healthcare-associated pneumonia.

    • Community-acquired pneumonia.

    • Ventilator-associated pneumonia.

  • Symptoms: Includes wheezing and/or crackles on auscultation, severe respiratory distress, high fever, chest pain, and shortness of breath.

Oxygen Administration

  • Goals:

    • Increase blood oxygen saturation (SpO2).

    • Reduce the work of breathing.

    • Minimize the workload on the heart.

    • Administer the lowest effective concentration of oxygen.

Oxygen Delivery Measurement

  • Flow Rate: Measured in liters per minute (LPM).

  • Fraction of Inspired Oxygen (FiO2): Indicates concentration of oxygen in the airflow, with room air being approximately 21% oxygen.

Oxygen Devices

  • Types of Oxygen Delivery Devices:

    • Nasal Cannula: Suited for non-acute situations, delivering up to 44% FiO2 at a flow rate of 1-6 L/min.

    • Simple Face Mask: Delivers 40-60% FiO2 at 5-10 LPM.

    • Non-rebreather Mask: Reservoir bag that prevents rebreathing of exhaled air, delivering FiO2 of 70-100% at 6-15 LPM.

    • Venturi Mask: Provides controlled percentages of oxygen (FiO2 24-50%) at flow rates of 2-15 LPM, especially useful for COPD patients.

    • Tracheostomy: Allows for oxygen delivery of up to 100% FiO2 at 4-10 LPM for patients with upper airway obstructions or requiring prolonged ventilation.

Ventilation Management

  • Contexts Requiring Ventilation:

    • Surgical procedures.

    • Respiratory failure due to lung illnesses.

    • Airway trauma, neuromuscular disorders, stroke, or drug overdose.

    • Cardiopulmonary arrest.

Advanced Oxygen Delivery Devices

  • BiPAP and CPAP:

    • CPAP: Continuous Positive Airway Pressure supports patients with obstructive sleep apnea.

    • BiPAP: Bi-level Positive Airway Pressure offers varying pressure settings for inhalation and exhalation, often used for COPD.

Clinical Assessment Scenarios

Patient Assessment Scenarios

  • Scenario: Assess a patient requiring highly controlled oxygen doses for COPD.

  • Scenario: Patient presents with SpO2 of 89% in an ambulatory setting; determine appropriate oxygen delivery device.

Other Nursing Interventions

  • Interventions to Support Respiratory Health:

    • Position patients for optimal breathing ease.

    • Elevate head of the bed (HOB).

    • Reduce anxiety levels.

    • Cluster nursing activities to minimize exertion.

    • Manage pain effectively to improve comfort and oxygenation.

Emergency Assessment Protocols

  • Initial Actions: In response to signs of respiratory distress (cyanosis, tachypnea, grunting):

    • Prioritize assessing the patient's immediate respiratory state before extensive history taking.

Case Study

  • Case: A 64-year-old male presents with chest pain, productive cough, high fever, tachycardia, and low SpO2. Key considerations include urgent interventions, isolation precautions, and comprehensive assessments.

Assessment Findings

  • Exam results including crackles, delayed capillary refill, elevated respiratory rate, cool skin, and elevated WBC count suggest possible respiratory infection or distress.