Podcast
Questions and Answers
Which bacterial characteristic is associated with Tuberculosis (TB)?
Which bacterial characteristic is associated with Tuberculosis (TB)?
- Acid-fast bacilli (correct)
- Spore-forming anaerobes
- Gram-positive cocci
- Gram-negative spirochetes
Latent tuberculosis is characterized by active symptoms and contagiousness.
Latent tuberculosis is characterized by active symptoms and contagiousness.
False (B)
What is the name of the vaccine used to prevent tuberculosis?
What is the name of the vaccine used to prevent tuberculosis?
BCG vaccine
A common symptom of spinal tuberculosis, also known as Pott's disease, is spinal ______.
A common symptom of spinal tuberculosis, also known as Pott's disease, is spinal ______.
Match the following terms related to tuberculosis with their definitions:
Match the following terms related to tuberculosis with their definitions:
Which population group is LEAST likely to be offered the BCG vaccine as part of a routine vaccination schedule?
Which population group is LEAST likely to be offered the BCG vaccine as part of a routine vaccination schedule?
The Mantoux test involves injecting live tuberculosis bacteria into the skin.
The Mantoux test involves injecting live tuberculosis bacteria into the skin.
What is the typical appearance of disseminated miliary tuberculosis on a chest X-ray?
What is the typical appearance of disseminated miliary tuberculosis on a chest X-ray?
In hospitals, ______ pressure rooms are used to prevent the airborne spread of tuberculosis.
In hospitals, ______ pressure rooms are used to prevent the airborne spread of tuberculosis.
Match the following symptoms with the condition they are most closely associated with in tuberculosis:
Match the following symptoms with the condition they are most closely associated with in tuberculosis:
What is the MOST common site of TB infection?
What is the MOST common site of TB infection?
A positive Mantoux test result is indicated by an induration of less than 5mm after 72 hours.
A positive Mantoux test result is indicated by an induration of less than 5mm after 72 hours.
What does NAAT stand for in the context of diagnosing tuberculosis?
What does NAAT stand for in the context of diagnosing tuberculosis?
The treatment for active tuberculosis includes rifampicin, isoniazid, pyrazinamide, and ______.
The treatment for active tuberculosis includes rifampicin, isoniazid, pyrazinamide, and ______.
Match the tuberculosis drug with its MOST common side effect:
Match the tuberculosis drug with its MOST common side effect:
Which of the following statements accurately describes 'acid-fast' bacteria?
Which of the following statements accurately describes 'acid-fast' bacteria?
The BCG vaccine provides complete protection against pulmonary tuberculosis.
The BCG vaccine provides complete protection against pulmonary tuberculosis.
What is the purpose of co-prescribing pyridoxine (vitamin B6) with isoniazid in TB treatment?
What is the purpose of co-prescribing pyridoxine (vitamin B6) with isoniazid in TB treatment?
The Ziehl-Neelsen stain causes acid-fast bacilli to appear ______ red against a blue background.
The Ziehl-Neelsen stain causes acid-fast bacilli to appear ______ red against a blue background.
Match the following investigations with their role in diagnosing tuberculosis:
Match the following investigations with their role in diagnosing tuberculosis:
A patient presents with a chronic cough, night sweats, and weight loss. Sputum culture grows 'acid-fast bacilli' that stain red with 'Ziehl-Neelsen staining'. Which condition is MOST likely?
A patient presents with a chronic cough, night sweats, and weight loss. Sputum culture grows 'acid-fast bacilli' that stain red with 'Ziehl-Neelsen staining'. Which condition is MOST likely?
Rifampicin increases the effectiveness of drugs metabolised by the cytochrome P450 enzymes.
Rifampicin increases the effectiveness of drugs metabolised by the cytochrome P450 enzymes.
What is the first step in managing a suspected case of active tuberculosis, besides starting treatment?
What is the first step in managing a suspected case of active tuberculosis, besides starting treatment?
A deep cough sputum sample can be induced with nebulised ______ saline if a patient is not producing enough sputum.
A deep cough sputum sample can be induced with nebulised ______ saline if a patient is not producing enough sputum.
Match the following descriptions with the appropriate stage or type of tuberculosis:
Match the following descriptions with the appropriate stage or type of tuberculosis:
Which of the following best describes the mechanism of action of the BCG vaccine?
Which of the following best describes the mechanism of action of the BCG vaccine?
A negative IGRA result always rules out the possibility of a TB infection.
A negative IGRA result always rules out the possibility of a TB infection.
What is the significance of testing culture samples for drug resistance before starting TB treatment?
What is the significance of testing culture samples for drug resistance before starting TB treatment?
Testing contacts for tuberculosis and notifying the ______ of suspected cases are crucial steps in TB management.
Testing contacts for tuberculosis and notifying the ______ of suspected cases are crucial steps in TB management.
Match the following chest X-ray findings with their associated type of tuberculosis:
Match the following chest X-ray findings with their associated type of tuberculosis:
A patient on RIPE therapy reports new onset of difficulty distinguishing between red and green. Which medication is MOST likely responsible?
A patient on RIPE therapy reports new onset of difficulty distinguishing between red and green. Which medication is MOST likely responsible?
Extrapulmonary tuberculosis only occurs in immunocompromised individuals.
Extrapulmonary tuberculosis only occurs in immunocompromised individuals.
Why is it important to assess patients for immunosuppression and HIV before administering the BCG vaccine?
Why is it important to assess patients for immunosuppression and HIV before administering the BCG vaccine?
When latent tuberculosis reactivates, leading to an active infection, it is typically due to ______.
When latent tuberculosis reactivates, leading to an active infection, it is typically due to ______.
Match the following diagnostic procedures for tuberculosis with their specific method of sample collection:
Match the following diagnostic procedures for tuberculosis with their specific method of sample collection:
A patient undergoing treatment for active TB develops numbness and tingling in their feet. Which medication is MOST likely the cause, and what should be co-administered?
A patient undergoing treatment for active TB develops numbness and tingling in their feet. Which medication is MOST likely the cause, and what should be co-administered?
Multidrug-resistant TB (MDR-TB) is defined as resistance to isoniazid only.
Multidrug-resistant TB (MDR-TB) is defined as resistance to isoniazid only.
Besides drug therapy, what other management considerations are essential for patients with active tuberculosis?
Besides drug therapy, what other management considerations are essential for patients with active tuberculosis?
After starting treatment for tuberculosis, a patient notices ______ discolouration of their urine. This is most likely due to Rifampicin.
After starting treatment for tuberculosis, a patient notices ______ discolouration of their urine. This is most likely due to Rifampicin.
Match the following risk factors with their increased susceptibility to tuberculosis:
Match the following risk factors with their increased susceptibility to tuberculosis:
What is the causative agent of tuberculosis?
What is the causative agent of tuberculosis?
M. tuberculosis is a fast-dividing bacterium.
M. tuberculosis is a fast-dividing bacterium.
What staining method is used to identify M. tuberculosis due to its waxy coating?
What staining method is used to identify M. tuberculosis due to its waxy coating?
A sputum culture that grows 'acid-fast bacilli' that stain red with '______ staining' is indicative of TB.
A sputum culture that grows 'acid-fast bacilli' that stain red with '______ staining' is indicative of TB.
Match each term with its corresponding description in the context of tuberculosis:
Match each term with its corresponding description in the context of tuberculosis:
Which of the following outcomes is LEAST likely following exposure to M. tuberculosis?
Which of the following outcomes is LEAST likely following exposure to M. tuberculosis?
Patients with latent tuberculosis are symptomatic and contagious.
Patients with latent tuberculosis are symptomatic and contagious.
What is a 'cold abscess' associated with tuberculosis?
What is a 'cold abscess' associated with tuberculosis?
Reactivation of latent tuberculosis, often due to ______, is known as secondary tuberculosis.
Reactivation of latent tuberculosis, often due to ______, is known as secondary tuberculosis.
Which of these is NOT a typical risk factor for tuberculosis?
Which of these is NOT a typical risk factor for tuberculosis?
The BCG vaccine uses live, attenuated Mycobacterium tuberculosis.
The BCG vaccine uses live, attenuated Mycobacterium tuberculosis.
What type of injection is the BCG vaccine?
What type of injection is the BCG vaccine?
The BCG vaccine is typically administered after a _______ test returns negative.
The BCG vaccine is typically administered after a _______ test returns negative.
What is the primary purpose of the BCG vaccine?
What is the primary purpose of the BCG vaccine?
The BCG vaccine is part of the routine vaccination schedule in most countries.
The BCG vaccine is part of the routine vaccination schedule in most countries.
Name one dermatological presentation that may be associated with tuberculosis.
Name one dermatological presentation that may be associated with tuberculosis.
Spinal pain in spinal tuberculosis is also known as _______ disease of the spine.
Spinal pain in spinal tuberculosis is also known as _______ disease of the spine.
A patient presents with a chronic cough, night sweats, and weight loss. Which of the following investigations is MOST appropriate to initiate?
A patient presents with a chronic cough, night sweats, and weight loss. Which of the following investigations is MOST appropriate to initiate?
Gram staining is an effective method for identifying M. tuberculosis.
Gram staining is an effective method for identifying M. tuberculosis.
What is measured 72 hours after a Mantoux test to determine the result?
What is measured 72 hours after a Mantoux test to determine the result?
In the Mantoux test, an induration of _______ or more is considered a positive result.
In the Mantoux test, an induration of _______ or more is considered a positive result.
What does a positive Interferon-Gamma Release Assay (IGRA) indicate?
What does a positive Interferon-Gamma Release Assay (IGRA) indicate?
The tuberculin used in the Mantoux test contains live bacteria.
The tuberculin used in the Mantoux test contains live bacteria.
What is the characteristic appearance of disseminated miliary tuberculosis on a chest x-ray?
What is the characteristic appearance of disseminated miliary tuberculosis on a chest x-ray?
Reactivated tuberculosis may show patchy or nodular consolidation with _______, typically in the upper zones on a chest x-ray.
Reactivated tuberculosis may show patchy or nodular consolidation with _______, typically in the upper zones on a chest x-ray.
Why is it important to collect culture samples before starting treatment for tuberculosis?
Why is it important to collect culture samples before starting treatment for tuberculosis?
Sputum induction involves the use of hypotonic saline.
Sputum induction involves the use of hypotonic saline.
What type of sample is collected during a bronchoalveolar lavage?
What type of sample is collected during a bronchoalveolar lavage?
_______ assess for the genetic material of a pathogen and can rapidly detect tuberculosis DNA.
_______ assess for the genetic material of a pathogen and can rapidly detect tuberculosis DNA.
In which patient populations is NAAT particularly useful for diagnosing tuberculosis?
In which patient populations is NAAT particularly useful for diagnosing tuberculosis?
Rifampicin treatment for tuberculosis lasts for 3 months.
Rifampicin treatment for tuberculosis lasts for 3 months.
According to the RIPE mnemonic, name the four drugs used in the initial treatment of active tuberculosis.
According to the RIPE mnemonic, name the four drugs used in the initial treatment of active tuberculosis.
Isoniazid can cause _______, and therefore _______ is co-prescribed to help prevent this side effect.
Isoniazid can cause _______, and therefore _______ is co-prescribed to help prevent this side effect.
Which of the following is NOT a recommended management option for tuberculosis?
Which of the following is NOT a recommended management option for tuberculosis?
Negative pressure rooms are used in hospitals to increase the risk of airborne spread of infections.
Negative pressure rooms are used in hospitals to increase the risk of airborne spread of infections.
What is the notable effect of rifampicin on bodily secretions?
What is the notable effect of rifampicin on bodily secretions?
Rifampicin is a potent inducer of the _______ enzymes, which can reduce the effectiveness of drugs metabolized by this system.
Rifampicin is a potent inducer of the _______ enzymes, which can reduce the effectiveness of drugs metabolized by this system.
A patient on TB treatment reports difficulty recognising colours. Which medication is MOST likely causing this?
A patient on TB treatment reports difficulty recognising colours. Which medication is MOST likely causing this?
Hyperuricemia is a side effect of isoniazid.
Hyperuricemia is a side effect of isoniazid.
Name three drugs used in TB treatment that are associated with hepatotoxicity.
Name three drugs used in TB treatment that are associated with hepatotoxicity.
A patient recently started treatment for tuberculosis and notices numbness or unusual sensations in their feet. The medication most likely implicated is _______.
A patient recently started treatment for tuberculosis and notices numbness or unusual sensations in their feet. The medication most likely implicated is _______.
A patient on rifampicin presents with reduced efficacy of their oral contraceptive pill. What is the mechanism behind this?
A patient on rifampicin presents with reduced efficacy of their oral contraceptive pill. What is the mechanism behind this?
Individuals vaccinated with BCG invariably test positive on the Mantoux test for the remainder of their lives.
Individuals vaccinated with BCG invariably test positive on the Mantoux test for the remainder of their lives.
A patient with suspected pulmonary tuberculosis is unable to produce a deep cough sputum sample. Which of the following is the MOST appropriate next step?
A patient with suspected pulmonary tuberculosis is unable to produce a deep cough sputum sample. Which of the following is the MOST appropriate next step?
While treating active tuberculosis with the standard RIPE therapy, a patient develops jaundice and dark urine. Given the risk of hepatotoxicity with multiple drugs in the regimen, the MOST prudent initial step would be to immediately perform _______.
While treating active tuberculosis with the standard RIPE therapy, a patient develops jaundice and dark urine. Given the risk of hepatotoxicity with multiple drugs in the regimen, the MOST prudent initial step would be to immediately perform _______.
Flashcards
Tuberculosis (TB)
Tuberculosis (TB)
Infectious disease caused by Mycobacterium tuberculosis.
Mycobacterium tuberculosis
Mycobacterium tuberculosis
Small rod-shaped bacteria that causes tuberculosis.
Acid-fast bacilli
Acid-fast bacilli
A bacterium's resistance to decolorization by acids during staining procedures.
Ziehl-Neelsen stain
Ziehl-Neelsen stain
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Multidrug-resistant TB (MDR-TB)
Multidrug-resistant TB (MDR-TB)
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Primary active tuberculosis
Primary active tuberculosis
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Latent tuberculosis
Latent tuberculosis
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Secondary tuberculosis
Secondary tuberculosis
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Miliary tuberculosis
Miliary tuberculosis
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Extrapulmonary tuberculosis
Extrapulmonary tuberculosis
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Cold abscess
Cold abscess
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BCG Vaccine
BCG Vaccine
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Mantoux test
Mantoux test
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Interferon-Gamma Release Assay (IGRA)
Interferon-Gamma Release Assay (IGRA)
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Chest X-ray Appearance: Primary TB
Chest X-ray Appearance: Primary TB
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Chest X-ray Appearance: Reactivated TB
Chest X-ray Appearance: Reactivated TB
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Chest X-ray Appearance: Miliary TB
Chest X-ray Appearance: Miliary TB
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TB Culture Samples
TB Culture Samples
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Nucleic Acid Amplification Tests (NAAT)
Nucleic Acid Amplification Tests (NAAT)
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Treatment for latent TB
Treatment for latent TB
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RIPE Therapy
RIPE Therapy
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Side Effects: Rifampicin
Side Effects: Rifampicin
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Side Effects: Isoniazid
Side Effects: Isoniazid
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Side Effects: Pyrazinamide
Side Effects: Pyrazinamide
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Side Effects: Ethambutol
Side Effects: Ethambutol
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Tuberculosis Symptom: Cough
Tuberculosis Symptom: Cough
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Tuberculosis Symptom: Haemoptysis
Tuberculosis Symptom: Haemoptysis
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Tuberculosis Symptom: Lethargy
Tuberculosis Symptom: Lethargy
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Tuberculosis Symptom: Fever/Night Sweats
Tuberculosis Symptom: Fever/Night Sweats
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Tuberculosis Symptom: Weight Loss
Tuberculosis Symptom: Weight Loss
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Tuberculosis Symptom: Lymphadenopathy
Tuberculosis Symptom: Lymphadenopathy
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Tuberculosis Symptom: Erythema nodosum
Tuberculosis Symptom: Erythema nodosum
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Tuberculosis Symptom: Spinal Pain
Tuberculosis Symptom: Spinal Pain
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Spinal Tuberculosis
Spinal Tuberculosis
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Mantoux Test Procedure
Mantoux Test Procedure
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Tuberculin
Tuberculin
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Positive Mantoux Test
Positive Mantoux Test
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IGRA Procedure
IGRA Procedure
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Positive IGRA Result
Positive IGRA Result
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Sputum Induction
Sputum Induction
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Bronchoscopy
Bronchoscopy
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What do NAATs do?
What do NAATs do?
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Isoniazid and Vitamin B6
Isoniazid and Vitamin B6
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Co-infection testing
Co-infection testing
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UK Health Security Agency
UK Health Security Agency
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Negative Pressure Rooms
Negative Pressure Rooms
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Rifampicin side effect
Rifampicin side effect
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Rifampicin: Enzyme Induction
Rifampicin: Enzyme Induction
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Study Notes
- Tuberculosis (TB) is an infectious disease caused by Mycobacterium tuberculosis.
- M. tuberculosis is a slow-dividing, rod-shaped bacterium (bacillus) with high oxygen requirements.
- Culture is difficult because of slow dividing and high oxygen requirements.
Identifying M. tuberculosis
- The waxy coating makes gram staining ineffective, thus requiring special staining.
- It is acid-fast, meaning it resists acids used in staining.
- Ziehl-Neelsen stain turns the bacteria bright red against a blue background.
- Chronic cough and night sweats, with red-staining acid-fast bacilli, signal TB.
Multidrug-Resistant TB
- Multidrug-resistant TB (MDR-TB) strains resist multiple TB drugs, such as isoniazid and rifampicin, making them harder to treat.
Disease Course
- Tuberculosis spreads mainly by inhaling saliva droplets from infected individuals.
- Possible outcomes after exposure include immediate clearance, primary active tuberculosis, latent tuberculosis, or secondary tuberculosis (reactivation).
- Uncontrolled infections can lead to disseminated, severe miliary tuberculosis.
- Latent tuberculosis involves the immune system encapsulating the bacteria, preventing disease progression, and is non-contagious.
- Secondary tuberculosis occurs when latent TB reactivates, often due to immunosuppression.
- The lungs are the most common site for TB infection because of the high levels of oxygen
- Extrapulmonary tuberculosis affects areas outside the lungs, such as lymph nodes, pleura, the central nervous system, pericardium, gastrointestinal and genitourinary systems, bones, joints and skin.
Cold Abscesses
- Cold abscesses are firm, painless abscesses often in the neck caused by TB, lacking typical inflammation.
Risk Factors
- Risk factors include close contact with active TB, immigration from high-prevalence areas, immunocompromised status, malnutrition, homelessness, drug use, and smoking.
- People with relatives/close contacts from countries with high TB rates are also at risk.
- Alcoholism is also a risk factor
BCG Vaccine
- The Bacillus Calmette-Guérin (BCG) vaccine uses a live, weakened Mycobacterium bovis to create immunity against M. tuberculosis.
- It is administered via intradermal injection.
- It protects against severe TB but less so against pulmonary TB.
- Patients are tested with the Mantoux test and screened for immunosuppression/HIV before vaccination due to it being a live vaccine.
- The BCG vaccine is offered to those at increased risk, such as those from high-prevalence areas or close contacts.
- It is also offered it to healthcare workers.
Presentation
- Tuberculosis usually presents with chronic, gradually worsening symptoms, and often pulmonary disease with systemic symptoms.
- Symptoms include cough, hemoptysis, lethargy, fever, night sweats, weight loss, lymphadenopathy, erythema nodosum, and spinal pain (Pott’s disease).
Investigations
- Diagnosing TB is challenging due to slow bacterial growth and the need for specialized stains like Ziehl-Neelsen.
- An immune response from previous, latent or active TB can be detected with the Mantoux test or interferon-gamma release assay (IGRA).
- Suspected active disease can be investigated with chest x-rays and cultures.
Mantoux Test Details
- Involves injecting tuberculin (TB proteins) intradermally on the forearm, causing a bleb.
- After 72 hours, the test is read by measuring induration; 5mm or more indicates a positive result.
Interferon-Gamma Release Assays
- IGRA mixes blood with M. tuberculosis antigens; sensitized white blood cells release interferon-gamma upon contact.
- The release of interferon-gamma indicates a positive result.
Chest X-Ray
- Primary TB may show patchy consolidation, pleural effusions, and hilar lymphadenopathy.
- Reactivated TB may show patchy or nodular consolidation with cavitation, usually in the upper zones.
- Disseminated miliary tuberculosis shows an appearance of millet seeds, uniformly distributed across the lung fields.
Cultures and Collection Methods
- Culture samples are ideally collected before treatment to test for drug resistance, but treatment often starts while awaiting results due to the slow growth.
- Sputum samples (3 separate), mycobacterium blood cultures, or lymph node aspiration/biopsy are used for collection.
- Deep cough sputum samples are preferred.
- If sputum production is insufficient, sputum induction with nebulized hypertonic saline or bronchoscopy with bronchoalveolar lavage is used.
Nucleic Acid Amplification Tests
- Nucleic acid amplification tests (NAAT) detect TB DNA in samples quickly and provide information on drug resistance.
- NAAT is used when diagnosing tuberculosis in patients with HIV, aged under 16, or with risk factors for multidrug resistance.
Treatment
- Latent TB is treated with isoniazid and rifampicin for 3 months or isoniazid alone for 6 months.
- Active TB treatment involves the RIPE regimen: rifampicin, isoniazid, pyrazinamide, and ethambutol; rifampicin and isoniazid are for 6 months, and pyrazinamide and ethambutol are for 2 months.
- Isoniazid causes peripheral neuropathy, so pyridoxine (vitamin B6) is co-prescribed.
- Testing for HIV, hepatitis B, and hepatitis C, and also testing contacts, are also important.
Additional Management
- UK Health Security Agency (UKHSA) must be notified of suspected cases.
- Patients with active TB should be isolated for at least 2 weeks of treatment.
- A specialist MDT guides management and follow-up.
- Individualized regimens are required for multidrug-resistant TB and extrapulmonary disease.
- Negative pressure rooms are used in hospitals to prevent airborne spread.
- These negative pressure rooms have ventilation systems that actively remove air to prevent it from spreading onto the ward.
Side Effects of Treatment
- Rifampicin can cause red/orange discoloration of secretions and reduces the effectiveness of drugs metabolized by cytochrome P450 enzymes, like combined contraceptive pills.
- Isoniazid can cause peripheral neuropathy, managed with pyridoxine (vitamin B6).
- Pyrazinamide can cause hyperuricemia, leading to gout and kidney stones.
- Ethambutol can cause colour blindness and reduced visual acuity.
- Rifampicin, isoniazid, and pyrazinamide can all cause hepatotoxicity.
- Numbness/tingling suggests isoniazid, difficulty with colors suggests ethambutol, and red/orange secretions suggests rifampicin.
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