Heart/ Oxygenation Lecture

The cardiovascular system consists of the heart and blood vessels, responsible for transporting blood throughout the body.
- Function: Circulate oxygenated blood to organs and tissues while returning deoxygenated blood back to the heart.

Deoxygenated blood flow from the body:
- Returns via the superior and inferior vena cavae into the right atrium.
- Passes to the right ventricle.
- Enters the pulmonary artery leading to the lungs.
Oxygenation process in the lungs:
- Blood picks up oxygen.
- Returns via the pulmonary vein into the left atrium and left ventricle.
Oxygenated blood distribution:
- Blood is pushed through the aorta to the body, distributing oxygen to organs and tissues.

Layers of the Heart:
- Epicardium: Outer layer providing protection.
- Myocardium: Middle layer composed of cardiac muscle responsible for contraction.
- Endocardium: Inner layer lining the heart chambers.

Knowledge of different heart layers is essential when discussing conditions such as endocarditis, indicating that the inner layer is affected.

The respiratory system consists of:
- Upper Respiratory Tract: Nose, nasal cavity, sinuses, pharynx.
- Lower Respiratory Tract: Larynx, trachea, lungs.

Filters air, reducing infection risk.
Facilitates respiration: Inspiration (taking in oxygen) and expiration (expelling carbon dioxide).

Cardiac issues can stem from:
- Decreased blood flow, often due to underlying diseases.
- Interrupted electrical impulses affecting heart rhythm.
- Electrolyte imbalances disrupting cardiac function.
- Heart failure indicated by poor pumping efficiency.

Chronic Obstructive Pulmonary Disease (COPD):
- A chronic lung disorder.
- Symptoms: Retention of carbon dioxide, difficulty expelling CO₂, leading to lower oxygen levels.
- Oxygen management: Caution against providing high levels of oxygen to patients as it can exacerbate breathing issues.
Asthma: Inflammation and narrowing of airways causing difficulty in breathing.
Pneumonia: Lung infection leading to consolidation of lung tissue.
Atelectasis: Collapse of alveoli or lung sequences, often post-surgery.
Respiratory failure: Failure to maintain normal gas exchange, can be caused by various respiratory viruses such as COVID-19 and influenza.

Importance of obtaining a thorough health history and vital signs.
- Smoking history: Assess smoking habits to determine potential lung damage.
- Cough assessment: Determine if cough is productive or non-productive, as well as the appearance of sputum.
Diagnostic tests:
- Pulmonary Function Tests (PFTs): Measure lung performance.
- Chest X-ray: Visualizes lung conditions.
- Electrocardiogram (ECG): Records electrical activity of the heart.
Telemetry Monitoring: Used for continuous cardiac monitoring, observing electrical impulses and detecting anomalies.
Ultrasound and Cardiac Catheterization: Assess blood flow and check for blockages in cardiac arteries.

Purpose of Oxygen Therapy:
- To maintain optimal cardiopulmonary function, especially in patients with heart or respiratory issues.
Oxygen as a medication: Requires a prescription and should be administered in the lowest effective dose.

Nasal Cannula:
- Typically delivers between 1 to 6 liters of oxygen per minute, providing an approximate oxygen concentration of 21% from room air.
- Must ensure correct positioning for effective delivery.
Simple Face Mask:
- Greater oxygen concentration than nasal cannula; requires a good facial seal.
Partial Rebreather Mask:
- Mixes room air with a portion of the patient's CO₂; not a 100% oxygen source.
Non-Rebreather Mask:
- Provides nearly 100% oxygen, equipped with valves to prevent exhaled air from entering.
Venturi Mask:
- Allows precise regulation of oxygen concentration; suitable for controlled oxygen delivery.
High Flow Nasal Cannula:
- Delivers 20 to 60 liters of oxygen per minute with humidification for high concentrations.

Types of artificial airways:
- Nasopharyngeal and Oropharyngeal: Keep airway open during sedation or surgery.
- Endotracheal Tube (ET Tube): Inserted into the trachea, usually during intubation; may be attached to ventilators.
- Tracheostomy Tube: Permanently placed in trachea for long-term ventilation.

Bronchodilators: Help open airways and reduce inflammation during respiratory distress.
Anticholinergic Agents: Reduce excessive secretions in COPD patients.
Corticosteroids: Useful in managing exacerbations of chronic respiratory conditions.
Vaccinations: Important for preventing respiratory infections (e.g., pneumococcal and influenza vaccines).

Encourage deep breathing and coughing post-surgery to prevent complications like atelectasis.
Use of incentive spirometers: Patient uses it frequently (10 times/hour) to promote lung expansion and prevent infection.
Chest Tubes: May be placed to drain fluid or air from pleural space, improving lung function.
Anticoagulation therapy: Prevents clotting, often necessary in respiratory and cardiovascular conditions.

For pneumonia management, initiate blood cultures within 24 hours of admission, followed by prompt initiation of antibiotics.

Open the floor for any questions regarding the topics discussed: heart function, respiratory issues, and treatment options.