237 Study Cards Flashcards
Define atelectasis.
closure or collapse of alveoli
What is the most common type of atelectasis?
acute atelectasis
What are common causes of atelectasis?
- post operation
- immobilization with shallow, monotonous breathing pattern
- excess secretions or mucus plug
- chronic airway obstruction (e.g. lung cancer)
What are the clinical manifestations of atelectasis?
- Usually insidious
- Cough, sputum production, and increasing dyspnea
- Tachycardia, tachypnea, pleural pain and central cyanosis may be anticipated
- Difficulty breathing in supine position and is anxious
What steps can you take to prevent atelectasis?
- Frequent turning
- Early mobilization
- Strategies to expand lungs and manage secretions
- Deep breathing every 2 hours
- Incentive spirometry
- Directed cough
- Suctioning
- Aerosol nebulizer treatment followed by chest physical therapy
- Bronchoscopy
What are the components of the ICOUGH program?
I - incentive spirometry
C- coughing and deep breathing
O - oral care (brushing teeth and mouth wash twice daily)
U - understanding (patient and staff education)
G- getting out of bed at least 3x daily
H - head-of-bed elevation
What is the pathophysiology of atelectasis?
- reduced alveolar ventilation or any type of blockage that impedes the passage of air to and from the alveoli
- Monotonous low tidal breathing pattern may cause airway closure and alveolar collapse. Can be caused by anesthesia or analgesic agents, supine positioning, splinting of chest wall because of pain, abdominal distension
- Impaired cough mechanism
- Excessive pressure on the lung tissue
What is involved in the assessment and diagnostics for atelectasis?
- Increase work of breathing and hypoxemia
- Decreased breath sounds and crackles
- Chest x-ray, SpO2-low saturation (<90%) or lower PaO2
What risk factors are there for atelectasis?
- Post op patients are at a high risk due to the effects of anesthesia or analgesic agents (surgical procedures: upper abdominal, thoracic, or open-heart surgery).
- Immobilized
- People with shallow, monotonous breathing patterns
- Those in a supine position
- Patients with impaired cough mechanisms
- Excessive pressure on the lungs
- Airway obstruction (cancer, mucus)
- Pain can impair the cough reflex
- Increased abdominal pressure/distension
- Age
- Exposure to pollutants
What are signs and symptoms of infection with chronic atelectasis?
- Chest pain
- Sputum production with yellow/green colored expectorant
- Pain on deep breathing
- Pain on exhalation, inhalation or both
- Fever
What assessments and assessment outcomes are involved with identifying atelectasis?
- Monitor vital signs (RR higher, temp, SpO2)
- Do a respiratory assessment (thorax and lungs)
- Monitor change in behaviour, mental status, and LOC
- Increased work of breathing (tachypnea, use of accessory muscles, tripod position breathing)
- Hypoxemia (check skin, nails, lips color)
- Increased respiratory rate
- Decreased breath sounds
- Crackles over affected areas
- Chest X-ray (revealing patchy infiltrates or consolidation areas)
- V/Q Scan
- Pulse Oximetry (SpO2) lower than 90%
- Low PaO2
- Physical assessment of dependent (lower part), basilar, and posterior areas of lung
What lab values are relevant with atelectasis?
- Less than 90% SpO2 (Sa02)or lower than normal PaO2 (normal PaO2 is 80 - 100 mm Hg)
- Blood gasses- low PA02 (partial pressure of arterial oxygen).
- Using a spirometer airflow values greater than 80% is normal.
- WBC if query infection, Sputum culture
- Difference between alveolar and arterial o2- normal value is less than 10 mm Hg (torr)– Atelectasis Increased A-a O2 gradient
- L/S ratio: 2:1 concentration of lecithin rapidly increases-sphingomyelin concentration decreases
- Decreased Po2 and o2 content
What diagnostic findings are associated with atelectasis?
- Chest X-ray would reveal patchy infiltrates or consolidated areas (MOST COMMON)
- Thoracentesis is done to remove fluid from the pleura
- Bronchoscopy, CT, imaging tests can confirm a diagnosis.
- Sp02 may be lower (less than 90%)
- Lower partial pressure of oxygen (Pa02)
- V/Q scan
How is atelectasis managed using pharmacological agents?
- Nebulizer or MDI (metered dose inhaler) treatments with a bronchodilator medication or sodium bicarbonate to assist with the expectoration of secretions
- Expectorants (such as guaifenesin) to thin and aid in removal of secretions or mucous plugs
- Use of oxygen therapy titrated to keep 02 saturations within acceptable range
- Antibiotics, antivirals to assist with the removal of infections
- If it is due to obstruction caused by lung cancer, various pharmacological interventions (Eg. chemotherapy & radiation) can be directed at shrinking the tumor to open airways and provide ventilation to the collapsed area
- Analgesics may be used if hypoventilation is caused by pain
What are some treatments for atelectasis?
- Frequent turning
- Early ambulation
- Lung volume expansion maneuvers (deep-breathing exercises, incentive spirometry)
- Positive end-expiratory pressure (PEEP) therapy (simple mask and one-way valve system)
- Continuous or intermittent positive pressure breathing
- Chest percussion and postural drainage
- Bronchoscopy
- Endotracheal intubation and mechanical ventilation
- Coughing/suctioning secretions
- Chest physical therapy to loosen secretions
- Radiation to shrink size of neoplasms causing compression of lung tissue
What is a pleural effusion?
- Collection of fluid in the pleural space
- Usually secondary to another disease
What are common causes of a pleural effusion?
- Heart failure (most common cause)
- Bacterial pneumonia
- Lung cancer
- Pulmonary embolism
- Pulmonary infection (often viral)
- Radiation therapy to the chest
- Nephrotic syndrome
- Hypothyroidism
- Liver disease
- Connective tissue disease
- Tuberculosis
- Infection
- Smoking
What are clinical manifestations of a pleural effusion?
- Those caused by the underlying disease process (eg. pneumonia, lung diseases) ; size of the effusion can affect severity of symptoms
- Severity of symptoms relates to the size of the effusion, speed of formation, and underlying lung disease
- May include:
- Fever
- Dyspnea
- Chest pain- increased with breathing and coughing (pleuritic pain)
- Small (dyspnea minimal) vs large effusion (shortness of breath present, lots of pressure on lungs from fluid)
- Asymmetrical chest expansion
- Decreased tactile fremitus
- Orthopnea (difficulty breathing unless sitting up or standing)
- Shallow, rapid breathing– crackles
- Fatigue, Loss of appetite, LOC
What is the pathophysiology of a pleural effusion?
- Typically secondary to other disease processes such as pneumonia, malignant effusions
- Abnormal volume of fluid accumulates into pleural space. Fluid has pathological significance. Can be serous, purulent, or sanguineous.
- Clear fluid may be transudate - which is filtrate of plasma moving through capillary tissues = occurring when there is an imbalance in hydrostatic or oncotic pressures - not diseased
- This can indicate that the pleural membranes are NOT diseased - in this case HF is the most common cause
- Or it can be exudate -which is leakage of blood, lymph or other fluid into tissues/cavities= which usually results from bacteria or tumors within the pleural surfaces
What is involved in the assessment of a pleural effusion?
- VS - increased Resp rate, shallow resps, tachycardia, decreased Sp 02, Increased HR and BP
- Respiratory assessment-
- Decreased or absent breath sounds over lung field
- Decreased tactile fremitus
- dull flat sound on percussion.
- Asymmetrical chest expansion - delayed or diminished expansion on side of effusion
- Patient may appear in respiratory distress on observation evidenced by:
- increased work of breathing
- Tachypnea
- use of accessory muscles, or
- have orthopnea when lying supine.
- Neurological assessment
- Pt may appear confused
- Reduced level of consciousness
- Tracheal deviation may be noted away from the affected side (rare).
What lab values are associated with a pleural effusion?
- Pleural fluid analyzed by:
- Bacterial culture
- Gram stain
- Acid-fast bacillus stain (for TB)
- Interferon-gamma concentrations
- Red and white blood cell counts
- Chemistry studies (glucose, amylase, dehydrogenase, protein)
- Cytology analysis for malignant cells
- pH (different pH results can be indicative of the type of effusion)
- CBC
- Increased white blood cells count
- Sputum culture
- Blood gases
What diagnostic tests are involved in diagnosing a pleural effusion?
- Chest X-ray, chest CT scan, and thoracentesis used to confirm the presence of fluid (in the pleural space)
- In some cases, lateral decubitus X-ray is obtained (have patient lay on affected side in side-lying position, which allows for layering out of fluid, producing a visible air-fluid line)
- Pleural biopsy (to look for cancer, infection, or other condition)
What is involved in the pharmacological management of a pleural effusion?
- Objective is to treat the underlying cause in order to prevent the re-accumulation of fluid
- Use of chemical pleurodesis to ensure recurrence of fluid build up does not occur (prevents fluid accumulation) → Chemical irritating agents are installed into the pleural space (bleomycin or talc)
- Chemotherapy to treat cancer (cancer can cause pleural effusion)
- Pain management
- Antibiotics to treat underlying infections
- If pleural effusion is a result of treatment of conditions, such as HF, diuretics may be used
- Bronchodilators
What are the treatment modalities for a pleural effusion?
- Prevent re-accumulation of fluids:
-
Thoracentesis to remove fluid (specimen analysis, relief of dyspnea and respiratory compromise)
- Prepare and position patient for thoracentesis, offering support throughout.
- Record thoracentesis fluid amount and send for appropriate lab testing
-
Thoracentesis to remove fluid (specimen analysis, relief of dyspnea and respiratory compromise)
- Tube Thoracostomy (chest drainage using a large diameter intercostal tube)
- Pain management of test tube and least painful positioning
- Chemical pleurodesis (for malignant effusions, obliterates the pleural space to prevent re-accumulation of fluid)
- Surgical pleurectomy, insertion of a drainage catheter, implantation of a pleuroperitoneal shunt
- Patient education of drainage system and care of catheters if outpatient