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Pathophysiology

- Tuberculosis (TB) is a chronic infectious disease caused by the bacterium Mycobacterium tuberculosis. TB mainly affects the lungs, but can also spread to other organs through the bloodstream or lymphatic system.

- TB is transmitted through airborne droplets that are expelled when a person with active pulmonary TB coughs, sneezes, speaks, or sings.

- These droplets contain M. tuberculosis and can remain suspended in the air for several hours.

- People who inhale these droplets may become infected with TB.

- When M. tuberculosis enters the lungs, it reaches the alveoli, where it encounters macrophages, which are immune cells that try to engulf and destroy the bacteria.

- However, some bacteria survive and multiply within the macrophages, forming granulomas, which are clusters of infected cells surrounded by other immune cells.

- Granulomas can prevent the bacteria from spreading further, but they can also damage the lung tissue and cause scarring or cavities.

- Most people who are infected with TB do not develop active TB disease, but remain in a latent state, where the bacteria are dormant and do not cause any symptoms. This is called latent TB infection (LTBI).

- People with LTBI are not contagious and cannot spread TB to others.

- However, they have a 5-10% lifetime risk of developing active TB disease, especially if their immune system is weakened by factors such as HIV infection, diabetes mellitus, malnutrition, corticosteroid use, or aging.

- Active TB disease occurs when the bacteria become active and multiply rapidly, causing symptoms such as persistent cough, hemoptysis (coughing up blood), chest pain, night sweats, weight loss, fatigue, and fever.

- Active TB disease can be pulmonary (affecting the lungs) or extrapulmonary (affecting other organs such as the lymph nodes, bones, kidneys, brain, or spine).

- Active TB disease is contagious and can spread TB to others through respiratory droplets.

Questions on Pathophysiology

Correct Answer is C

Explanation

Incorrect. Cervical lymphadenopathy is not necessarily indicative of a secondary bacterial infection.

Correct Answer is D

Explanation

Correct. Using multiple medications in combination therapy makes it more difficult for TB bacteria to develop resistance to all drugs simultaneously, helping to prevent drug-resistant TB.

Correct Answer is C

Explanation

Incorrect. While cleanliness and hygiene are important, excessive handwashing alone is not sufficient to prevent TB transmission, as the bacteria are primarily transmitted through the air.

Correct Answer is C

Explanation

Incorrect. LTBI carries a risk of progressing to active TB disease, although the risk is relatively low in many individuals.

Correct Answer is A

Explanation

Incorrect. Although improving patient compliance is important, the primary purpose of using multiple drugs is to reduce drug resistance.

Correct Answer is B

Explanation

Incorrect. TB is not primarily transmitted through contact with skin lesions. It primarily affects the lungs and is transmitted through the respiratory route.

Correct Answer is C

Explanation

Incorrect. Underlying health conditions like HIV, diabetes, and immunosuppression can indeed increase the risk of TB due to compromised immune function.

Correct Answer is B

Explanation

Incorrect. While using multiple antibiotics can help manage side effects, the primary reason is to prevent drug resistance.

Correct Answer is D

Explanation

Correct. Following good respiratory hygiene and avoiding crowded, poorly ventilated areas are essential measures to reduce the risk of TB transmission in high-burden areas.

Correct Answer is C

Explanation

Incorrect. TB treatment should be completed as prescribed, regardless of the absence of symptoms, to prevent drug resistance and relapse.

Correct Answer is C

Explanation

Incorrect. CT scans may be used in TB diagnosis but are not typically used for initial screening of TB infection.

Correct Answer is C

Explanation

Incorrect. Blurred vision and eye pain are not typical symptoms of TB, although TB can affect other parts of the body in addition to the lungs.

Correct Answer is B

Explanation

Incorrect. Atypical pneumonia may have different symptoms, and it is not the most likely diagnosis based on the symptoms provided.

Correct Answer is A

Explanation

Incorrect. Granulomas are not the primary site of TB bacteria replication; instead, they are formed to limit bacterial replication and spread.

Correct Answer is D

Explanation

Correct. Coughing up blood (hemoptysis) is a possible symptom of TB and should be reported to a healthcare provider for further assessment and management.

Correct Answer is C

Explanation

Incorrect. Isolation is not typically needed during TB treatment, as clients can resume their normal activities once their infectiousness has decreased.

Correct Answer is B

Explanation

Incorrect. Ventilating living spaces by keeping windows and doors open, not closed, helps reduce the concentration of infectious particles in the air.

Correct Answer is C

Explanation

Incorrect. TB can be transmitted in close household settings, so infection control measures are important to prevent transmission to family members.

Correct. Completing the recommended treatment course for LTBI is essential to reduce the risk of developing active TB disease.

Incorrect. Medications for TB should not be shared with family members or others, as they need individualized treatment and evaluation.

Incorrect. TB medications should be taken as prescribed, not solely based on symptom severity.

Incorrect. Follow-up appointments are typically not optional; they are a standard part of TB care to ensure successful treatment and minimize the risk of relapse.

Incorrect. Chest X-rays are routinely used in the diagnosis and management of TB, especially for assessing lung involvement.

Incorrect. Gram stain is a laboratory technique used to visualize the characteristics of bacterial cells but is not specific for Mycobacterium tuberculosis.

Incorrect. LTBI does not always progress to active TB disease. In fact, many individuals with LTBI do not develop active disease, but they are at risk, especially if their immune system becomes compromised.

Incorrect. Confusion and memory loss are not typical symptoms of pulmonary TB; they may occur in cases of disseminated or extrapulmonary TB.

Incorrect. Avoiding close contact with the client is not a practical measure for healthcare professionals providing care to TB patients. Proper isolation measures are more effective.

Incorrect. While anxiety or panic attacks can cause chest discomfort, pleuritic chest pain is more likely related to a physical condition, such as pleural inflammation.

Incorrect. CT scans are commonly used in the evaluation and management of TB, especially for assessing lung abnormalities.

Incorrect. Waiting until the next appointment may lead to prolonged side effects and potential treatment complications.

Incorrect. Although improving patient compliance is important, the primary purpose of using multiple drugs is to reduce drug resistance.QUESTIONS

Incorrect. TB bacteria in latent infection are in a dormant state and do not actively multiply, although they remain viable.

Incorrect. Sputum samples should be collected in specific containers designed for this purpose to maintain sample integrity and avoid contamination.

Incorrect. LTBI and active TB disease are distinct conditions, and LTBI does not always require immediate treatment. Treatment may be recommended for individuals at higher risk of progression to active disease.

Incorrect. While treatment duration can vary based on individual factors, the minimum duration is typically six months for active TB.
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