7.1 Respiratory Part 2 Flashcards
Pulmonary TB
- Airborne illness spread by droplet nuclei
- Transmission occurs when droplets are inhaled and reach the alveoli
- Most TB is caused by Myobacterium Tuberculosis
- Small amount can be caused by Myobacterium Avium Complex (MAC)
Pathophysiology TB
- Tubercle bacilli is inhaled and multiplies in the alveoli
- Small amounts can enter the blood and spread to other areas of the body (brain, larynx, lymph nodes, lung, spine, bone, kidneys)
- 2-8 weeks macrophages attempt to ingest the bacteria, causing the bacteria to create a shell called granuloma
- When immune system cannot keep the bacteria under control, it multiplies and can travel to different areas such as the lungs, kidneys, brain and bones
Latent TB Infection
- Granulomas is an inactive infection but when broken, becomes active TB
- Can be detected by skin test or IFGA 2-8 weeks after infection
- Immune system can usually stop multiplication of the bacteria
- LTBI is not infectious
TB Disease
- When granuloma break down it becomes active TB disease
- This form is infectious
- Confirmed by M. tb cultures
TB Sites of Disease
- Lungs are most common site
MILIARY TB - TB travels to different areas (Extrapulmonary TB) - Can cause meningitis in the CNS as well as brain/spinal cord
- Extrapulmonary TB is not infectious unless the patient has some form of pulmonary disease already, or it occurs in the oral cavity/larynx.
Risk of Developing TB
- 10% of people who are exposed will develop TB if not treated
- Weakened immune system or HIV can heighten risk of developing TB after exposure
LTBI (Latent TB)
- Bacteria that is alive but inactive (small amounts)
- Non-infectious
- Asymptomatic
- TB skin tests and blood tests can detect LTBI
- Sputum/Cultures show up as negative
- Normal radiograph
- Is not considered a TB case
- Treatment should be considered to prevent TB
TB Disease
- Active bacteria
- Infectious
- Cough/Fever/Chills/Weight loss
- Positive TB Skin and Blood Test
- Radiograph abnormal
- Sputum/Cultures are positive
- Needs treatment
- Respiratory isolation
- TB Case
MDR TB and XDR TB
MDR (Multi-Drug Resistant)
- Resistant to first line drugs such as isoniazid and rifampin
XDR (Extensive-Drug Resistant)
- Resistant to both first line drugs and second line drugs
Primary resistance - Individual contracted a drug resistant TB
Secondary resistance - Individual developed drug resistant TB during drug therapy
TB EVALUATION
TB Symptoms
Patient can either have no symptoms or the following symptoms below
- Prolonged cough for 3+ weeks
- Hemoptysis (spitting blood)
- Chest pain
- Loss of appetite, unexplained weight loss
- Night sweats, fever, fatigue
Extrapulmonary TB Symptoms
Kidneys - Hematuria (blood in urine)
Meningitis - Headache/confusion
Spine - Back pain
Larynx - Hoarseness
- Loss of appetite, unexplained weigh loss, night sweats, fever, fatigue
History/Physical
- Ask about exposure and whether they have vaccine
Skin Test
Skin Test
- Mantoux method (intradermal injection of tuberculin on forearm)
- Assessed in 48-72 hours for size and induration (hardness)
- Look for hardening not redness
- Skin test cannot tell if disease is latent or active when positive result is shown
- Negative means that they do not have latent or active TB
2-step-method
- If first test is positive they are infected
- If first test is negative, another test is given in 1-3 weeks and if positive they are infected, if negative they are not
X-Ray
- Chest X-rays are used to confirm TB
Interferon Gamma Release Assay (IGRA) aka T-Spot Serum Test
- Positive results show that you have TB but cannot distinguish between latent or active
Sputum Culture
- Gold standard for TB screening
- Patient is cultured monthly until 2 consecutive negative cultures are seen
Medical Management TB
- Always treated with 2 or more drugs with direct observation
- Using 1 drug increases chances of bacteria developing resistance
- Treatment is effective when no bacteria is observed in sputum
- Requires long-term treatment and TB is resistant to many medications
- Broad spectrum is not used, only drugs selective for TB
TB Induction Phase
2 months of 4 drugs
- Isoniazid (INH)
- Rifampin
- Pyrazinamide
- Ethambutol
- Most important TB drugs to eliminate extracellular TB (sputum becomes non-infectious)
TB Continuation Phase
- Consists of at least 2 drugs after susceptibility reports
- Isoniazid and Rifampin if no drug resistant bacteria is found
- 4 months for non-drug resistant strains
- 4-7 months for non-drug resistant strains in HIV patients
- Goal is to eliminate intracellular TB
TB Resistant Strains Treatment
Primary drugs
- INH
- Rifampin
- Rifabutin
- Ethambutol
- Pyrazinamide
Secondary Drugs
- Levofloxacin
- Moxifloxacin
- Kanamycin
- Capreomycin
- Amikacin
- Cycloserine
- Ethionamide
- Para-aminosalicylic acid (PAS)
TB Nursing Management
- Airway clearance
- Advocating adherence to treatment
- Promote activity/nutrition
- Prevent transmission
Preventing TB Transmission
- Promote Proper Ventilation
(Primary Control includes opening doors and windows)
(Mechanical Ventilation in hospitals with negative pressure rooms) - Isolation rooms with negative pressure (AII rooms)
- Use N95 mask when entering rooms
- OR should use the same ventilation during treatment
- PPE
- Testing for fitted masks for hospital workers
- Respirators can be used for healthcare workers (not for patients)
- Surgical masks can be worn by patient (not for healthcare workers)
TB Infection Control in Home
- Can be sent home while still infectious
- Make sure there are no young or immunocompromised people at home
- Patient cannot travel unless it is for a healthcare appointment
- Cover mouth when coughing/sneezing
- Healthcare workers should wear respirators when visiting patient homes
Pneumonia (PNA)
- Inflammation of parenchyma caused by bacteria, fungi, or viruses
Pneumonia Types
Community acquired (CAP) - Occurring in community (48 hours or less after hospital admission)
Healthcare-associated (HCAP)
- Pneumonia occurring in non-hospitalized patient who comes in contract with healthcare frequently
Hospital-acquired (HAP)
- Occurs 48 hours or more after admission
Ventilator-associated (VAP)
- Develops 48 hours+ after endotracheal intubation or mechanical ventilation
Pneumonia Prevention
- Pneumococcal vaccine
Recommended for all adults 65+ and 19+ with weak immune systems - Smoking cessations
- Reducing risk of aspiration
- Hand hygiene
Pneumonia Risk Factors
- Age
- Comorbidities
- Alcohol
- Immunosuppression
- Antibiotic therapy
- Poor nutrition
- Aspiration
Pneumonia Manifestations
Bacteria (Pneumococcal)
- Chills/Fever
- Pleuritic chest pain
- Respiratory distress
- Tachypnea
Viral/Mycoplasma/Legionella
- Bradycardia
- Orthopnea
- Crackles
- Increased tactile fremitus
- Purulent sputum
- Respiratory tract infection
- Headache
- Low-grade fever
- Myalgia (muscle aches)
- Rash
- Pharyngitis
Diagnosis of Pneumonia
- Health history and physical exam
- X-ray (in high fowler position
- Sputum/Blood culture
- Bronchoscopy for severe cases