Introduction:
Pneumonia, along with lung cancer renders a patient's life span questionable, especially in an advanced stage of cancer. In most cases, pneumonia occurs after lung cancer has been diagnosed. But there are clinical conditions that present as pneumonia in patients and they are later diagnosed with lung cancer. Either way, both can complicate the patient’s condition.
What Is Pneumonia?
Pneumonia is an infection caused by any organism, like bacteria, fungi, or viruses. It is a condition that infects the air sacs in the lungs and fills them with fluids or pus, causing cough with phlegm or sputum. It can occur in any age group, from newborns to older adults.
What Is Lung Cancer?
An abnormal growth of cancer cells in the lung results in the formation of tumors or masses is called lung cancer. It usually occurs due to cancer-causing agents present in the smoke of vehicles, cigarettes smoking, etc. Lung cancer leads to alteration in lung function, thereby altering the quality of life and can also lead to death.
How Are Pneumonia and Lung Cancer Linked?
Susceptibility to pneumonia in cancer patients differs as per the cancer type, cancer stage, host response, and immune system. However, the presence of the following features in cancer patients can lead to an increased risk of contracting pneumonia.
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Mass Lesions - The presence of lesions or tumors in the lungs can easily serve as a place to habitat any bacteria.
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Aspiration Events - Poor ability to swallow and changes in the function of airways which can, unfortunately, occur as a complication of lung cancer treatment and can also host pneumonia.
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Bacterial Translocation - In certain conditions, the spread of pathogens from one region to another region can occur, leading to the pneumococcal infection in the lungs.
What Causes Pneumonia in Lung Cancers?
The following are the causes of pneumonia in lung cancers:
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Derangements in The Lung Anatomy - Changes in the anatomy's normal structure can alter function, which can easily be susceptible to infections.
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Decreased Lung Function - Lung function can decrease due to the presence of a tumor or as a complication of lung cancer treatment, both of which can host pneumococcal infection.
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Low Immunity - Pneumonia and even common cold can be easily caused in patients with low immunity.
What Complications Arise Due to Presence of Pneumonia in Lung Cancer Patients?
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Empyema - Collection of infection (pus) between the lung and chest wall, causing chest pain, breathing difficulty, fever, and chills. It can be managed by proper antibiotic therapy and drainage of the infection. In certain cases, loss of lung function and death is also seen.
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Lung Abscess - Formation of small cavities in the lung containing infective debris or fluid. It usually causes chest pain, cough, fatigue, and night sweats. Antibiotic therapy is used in the management of infection drainage. However, the outcome of the treatment depends on the patient's response to the treatment.
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Fistula - Fistula is a collection between two surfaces. A lung fistula usually connects the lung's main stem to the space around the lung. It usually occurs after pneumonectomy or partial lung resection (removal of total or part of the lung).
Can Pneumonia Be Prevented in Cancer Patients?
Pneumonia can be prevented in cancer patients by the following:
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Optimized sterilization protocol.
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Preventing any oral transmission.
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Taking care of vaccinations during lung cancer.
How Can Pneumonia in Lung Cancer Be Diagnosed?
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Clinical Features - Though pneumonia and lung cancer cannot be clinically undifferentiated by symptoms, on keen clinical examination, the physician can arrive at a provisional diagnosis of pneumonia.
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Chest X-ray - It is a conventional method of detecting any abnormalities in the chest cavity. Still, it is not a reliable source of diagnosis due to the evolution of newer advanced diagnostic methods.
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Computed Tomography (CT) Scan - Nodules, infiltrates, and lobar consolidations are found in the scan. It is an advanced diagnostic tool as compared to a chest X-ray.
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Positron Emission Tomography (PET) Scan - PET FDG (PET 18 fluorodeoxyglucose) can predict the presence of pneumonia in cancer patients.
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Diagnostic Bronchoscopy - In patients requiring sputum for the examination that cannot be obtained, bronchoalveolar lavage with bronchoscopy is used to produce the content for examination.
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Trans-Bronchial Biopsy - It is a process in which the lung tissue is obtained for examination of various lung diseases.
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Serial Dilution Culture - As pneumonia is a bacterial infection, it becomes necessary to detect the presence of bacteria through serial dilution culture.
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Urine Antigen Testing - Changes in urine antigen levels of higher C-reactive proteins can be correlated with the patient's condition.
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Biomarkers - Biomarkers are used to detect pneumonia in patients whose immunity is compromised.
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Endo-Bronchial Ultrasound - It is a diagnostic method used to identify the lung's tumor or mass, followed by a transbronchial biopsy.
What Are the Treatment Strategies for Pneumonia Associated Lung Cancer?
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Antibiotic Therapy - It is started simultaneously with the diagnostic tests as there is a risk of secondary complications, including death in patients with less immunity. The antibiotics are stopped during the bronchoscopic evaluation until the completion of the process to get proper values of the diagnostic procedure.
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AntiMicrobial Therapy - Antimicrobial, including drugs acting against a wide range of pathogens, are used to treat hospital-acquired pneumonia, ventilator-associated pneumonia, or healthcare-associated pneumonia.
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Granulocytopenia Correction - Filgrastim, Lenograstim, and Pegfilgrastim are commercially available drugs used to correct granulocytopenia.
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Donar Granulocytes Infusion - It is an adjunct therapy aiming to produce positive results in cancer patients.
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Interleukin 12 - The administration of interleukin 12 has also been proposed to reduce lung infections such as pneumonia.
Conclusion:
Pneumonia and lung cancer together can cause challenging complications in cancer patients. Clinical treatment includes standard antibacterial therapy as well as proper diagnosis. A positive outcome of the treatment is obtained by recognizing the condition early, considering the patient's clinical situation, and initiating antibiotic therapy when required. Improving the patient's clinical situation by improving the patient's immunity includes host-directed therapies, which are being studied and can replace traditional treatment methods, helping the patient to recover better. Early detection of symptoms, proper diagnosis, and consulting a physician at the earliest can avoid many complications.