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Pathology - Pulmonary hypertension
Definition: A mean pulmonary artery pressure above 25 mmHg at rest or 30 mmHg during exertion.
Categories Secondary pulmonary hypertension is a consequence of chronic pulmonary or cardiac conditions. Primary pulmonary hypertension manifests in the absence of chronic pulmonary or cardiac conditions.
Epidemiology
• Secondary pulmonary hypertension is prevalent. Primary pulmonary hypertension is uncommon.
Aetiology
Common etiologies of secondary hypertension encompass COPD, interstitial lung disease, left ventricular failure, and chronic pulmonary thromboemboli. Primary pulmonary hypertension may be idiopathic or linked to specific medications, HIV infection, collagen vascular disorders, and congenital systemic-to-pulmonary shunts.
Pathogenesis: Chronic hypoxia and obliterative pulmonary fibrosis contribute to elevated pressure in the pulmonary arterial circulation.
Presentation • Secondary pulmonary hypertension exacerbates the symptoms of the pre-existing illness, resulting in increased breathlessness. • Primary pulmonary hypertension manifests as exertional dyspnoea and exhaustion. Dizziness and syncope are prevalent as well.
Macroscopy • The identification of atherosclerosis in major pulmonary arteries indicates potential underlying pulmonary hypertension. • Right ventricular hypertrophy may also be observed.
Histopathology: All cases have muscular hypertrophy and intimal proliferation of tiny pulmonary arteries, together with muscularization of pulmonary arterioles. • Severe instances have plexiform lesions, marked by the proliferation of slit-like vascular gaps originating from the arterial wall. • Extremely severe cases may present with fibrinoid necrosis of the arterial wall.
Prognosis • Secondary pulmonary hypertension typically indicates substantial cardiac or pulmonary pathology with a bad prognosis. The prognosis for primary pulmonary hypertension is bleak, with 5-year survival rates ranging from 25% to 50%.
Definition: A mean pulmonary artery pressure above 25 mmHg at rest or 30 mmHg during exertion.
Categories Secondary pulmonary hypertension is a consequence of chronic pulmonary or cardiac conditions. Primary pulmonary hypertension manifests in the absence of chronic pulmonary or cardiac conditions.
Epidemiology
• Secondary pulmonary hypertension is prevalent. Primary pulmonary hypertension is uncommon.
Aetiology
Common etiologies of secondary hypertension encompass COPD, interstitial lung disease, left ventricular failure, and chronic pulmonary thromboemboli. Primary pulmonary hypertension may be idiopathic or linked to specific medications, HIV infection, collagen vascular disorders, and congenital systemic-to-pulmonary shunts.
Pathogenesis: Chronic hypoxia and obliterative pulmonary fibrosis contribute to elevated pressure in the pulmonary arterial circulation.
Presentation • Secondary pulmonary hypertension exacerbates the symptoms of the pre-existing illness, resulting in increased breathlessness. • Primary pulmonary hypertension manifests as exertional dyspnoea and exhaustion. Dizziness and syncope are prevalent as well.
Macroscopy • The identification of atherosclerosis in major pulmonary arteries indicates potential underlying pulmonary hypertension. • Right ventricular hypertrophy may also be observed.
Histopathology: All cases have muscular hypertrophy and intimal proliferation of tiny pulmonary arteries, together with muscularization of pulmonary arterioles. • Severe instances have plexiform lesions, marked by the proliferation of slit-like vascular gaps originating from the arterial wall. • Extremely severe cases may present with fibrinoid necrosis of the arterial wall.
Prognosis • Secondary pulmonary hypertension typically indicates substantial cardiac or pulmonary pathology with a bad prognosis. The prognosis for primary pulmonary hypertension is bleak, with 5-year survival rates ranging from 25% to 50%.
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Pathology - Pulmonary thromboembolism
Definition: Occlusion of a pulmonary artery by an embolic thrombus.
Epidemiology: Highly prevalent and frequently underdiagnosed.
Aetiology • Pulmonary emboli arise from deep vein thromboses, thus sharing identical risk factors, including immobility, acute medical conditions, recent surgical procedures, malignancy, pregnancy, and both inherited and acquired thrombotic diseases.
Pathogenesis: A piece of a detached thrombus from deep vein thrombosis embolizes via the right side of the heart into the pulmonary arterial circulation and becomes lodged in a pulmonary artery.
The clinical presentation is contingent upon the size of the pulmonary artery obstructed by the embolus. • Blockage of a large pulmonary artery usually leads to rapid death due to a sudden massive rise in pulmonary arterial pressure, acute right ventricular failure, and cardiac arrest. • Occlusion of medium-sized arteries results in a region of ventilation-perfusion imbalance in the lungs, leading to dyspnea. • Minor pulmonary emboli may produce mild manifestations of dyspnea, thoracic discomfort, and vertigo; these symptoms can often remain undetected.
Macroscopy
• Emboli appear as thrombi pieces within pulmonary arteries. • Thrombi are solid and brown, with the sliced surface potentially displaying discernible bands (lines of Zahn). Histopathology: Fresh thromboemboli consist of a composite of fibrin and interwoven blood cells, frequently organized in alternating linear bands that align with the macroscopic lines of Zahn. • Thromboemboli undergo organization after 2–3 days, characterized by the proliferation of granulation tissue consisting of fibroblasts and capillaries derived from the vessel wall. • Aged thromboemboli may manifest as fibrous nodules protruding from the vessel wall or as fibrous bands traversing the lumen of a pulmonary artery.
Prognosis
• Approximately 30% of all patients succumb to pulmonary embolism. • The mortalityz risk significantly increases if the diagnosis is not promptly established.
Definition: Occlusion of a pulmonary artery by an embolic thrombus.
Epidemiology: Highly prevalent and frequently underdiagnosed.
Aetiology • Pulmonary emboli arise from deep vein thromboses, thus sharing identical risk factors, including immobility, acute medical conditions, recent surgical procedures, malignancy, pregnancy, and both inherited and acquired thrombotic diseases.
Pathogenesis: A piece of a detached thrombus from deep vein thrombosis embolizes via the right side of the heart into the pulmonary arterial circulation and becomes lodged in a pulmonary artery.
The clinical presentation is contingent upon the size of the pulmonary artery obstructed by the embolus. • Blockage of a large pulmonary artery usually leads to rapid death due to a sudden massive rise in pulmonary arterial pressure, acute right ventricular failure, and cardiac arrest. • Occlusion of medium-sized arteries results in a region of ventilation-perfusion imbalance in the lungs, leading to dyspnea. • Minor pulmonary emboli may produce mild manifestations of dyspnea, thoracic discomfort, and vertigo; these symptoms can often remain undetected.
Macroscopy
• Emboli appear as thrombi pieces within pulmonary arteries. • Thrombi are solid and brown, with the sliced surface potentially displaying discernible bands (lines of Zahn). Histopathology: Fresh thromboemboli consist of a composite of fibrin and interwoven blood cells, frequently organized in alternating linear bands that align with the macroscopic lines of Zahn. • Thromboemboli undergo organization after 2–3 days, characterized by the proliferation of granulation tissue consisting of fibroblasts and capillaries derived from the vessel wall. • Aged thromboemboli may manifest as fibrous nodules protruding from the vessel wall or as fibrous bands traversing the lumen of a pulmonary artery.
Prognosis
• Approximately 30% of all patients succumb to pulmonary embolism. • The mortalityz risk significantly increases if the diagnosis is not promptly established.
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Pathology – Asthma
Definition
• A chronic inflammatory condition of the major airways marked by recurring episodes of reversible airway constriction.
Epidemiology: Highly prevalent, impacting over 10% of children and 5% of adults.
Aetiology • The majority of cases are linked to atopy, a hereditary predisposition of the immune system to generate IgE in reaction to prevalent environmental allergens. • The aetiology of non-atopic asthma remains ambiguous; nevertheless, some propose a connection with gastro-oesophageal reflux syndrome.
Pathogenesis: Atopic individuals react to prevalent environmental allergens by generating substantial quantities of allergen-specific IgE, which attaches to the surface of mast cells. • Subsequent exposure to the allergen results in the cross-linking of allergen-specific IgE antibodies and the degranulation of mast cells. Degranulated mast cells provoke airway inflammation and bronchospasm. Chronic inflammation leads to hypersensitive airways that respond to many stimuli, such as physical exertion, cold air, and tobacco smoke. Presentation: Intermittent episodes of dyspnea, wheezing, and chest constriction. Coughing, especially during nocturnal hours, is prevalent.
Macroscopy • The lungs of the majority of asthmatics may appear macroscopically normal. • In severe illness, thick mucus plugs may be observed in the airways.
Histopathology • The airways exhibit signs of inflammatory activity characterized by the presence of eosinophils, which are typically absent in normal airways. • Additionally, there may be thickening of the basement membrane, hyperplasia of goblet cells, and pronounced smooth muscle.
Prognosis: Generally favorable with suitable treatment. • A minor fatality rate is linked to severe acute asthma.
Definition
• A chronic inflammatory condition of the major airways marked by recurring episodes of reversible airway constriction.
Epidemiology: Highly prevalent, impacting over 10% of children and 5% of adults.
Aetiology • The majority of cases are linked to atopy, a hereditary predisposition of the immune system to generate IgE in reaction to prevalent environmental allergens. • The aetiology of non-atopic asthma remains ambiguous; nevertheless, some propose a connection with gastro-oesophageal reflux syndrome.
Pathogenesis: Atopic individuals react to prevalent environmental allergens by generating substantial quantities of allergen-specific IgE, which attaches to the surface of mast cells. • Subsequent exposure to the allergen results in the cross-linking of allergen-specific IgE antibodies and the degranulation of mast cells. Degranulated mast cells provoke airway inflammation and bronchospasm. Chronic inflammation leads to hypersensitive airways that respond to many stimuli, such as physical exertion, cold air, and tobacco smoke. Presentation: Intermittent episodes of dyspnea, wheezing, and chest constriction. Coughing, especially during nocturnal hours, is prevalent.
Macroscopy • The lungs of the majority of asthmatics may appear macroscopically normal. • In severe illness, thick mucus plugs may be observed in the airways.
Histopathology • The airways exhibit signs of inflammatory activity characterized by the presence of eosinophils, which are typically absent in normal airways. • Additionally, there may be thickening of the basement membrane, hyperplasia of goblet cells, and pronounced smooth muscle.
Prognosis: Generally favorable with suitable treatment. • A minor fatality rate is linked to severe acute asthma.
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Pathology - Bacterial pneumonia
Definition: An infection of the lung parenchyma induced by bacterial pathogens.
Classification • Acquired inside the community. • Nosocomial. • Aspiration. • Immunosuppression.
Epidemiology • Extremely prevalent.
Microbiology • Community-acquired pathogens: Streptococcus pneumoniae, Mycoplasma pneumoniae, Haemophilus influenzae, Legionella pneumophila. • Hospital-acquired: Gram-negative bacteria, such as Klebsiella, Escherichia coli, and Pseudomonas. • Aspiration: a combination of aerobic and anaerobic bacteria. • Immunosuppression: all previously stated possibilities, including viral, mycobacterial, and Pneumocystis infections. Coexisting infections frequently occur in immunosuppressed individuals.
Pathogenesis Bacterial bypass the lung's defenses and initiate infection within the alveoli.
Presentation: • Productive cough, dyspnea, thoracic discomfort, and pyrexia. Macroscopy • The infected lung parenchyma exhibits a firm texture and a yellowish hue. • Purulent exudate may be expelled from minor air passages. The superficial pleura may exhibit signs of pleuritis. Histopathology The alveolar gaps are occupied by an inflammatory infiltrate abundant in neutrophils. Bacterial colonies are frequently discernible within the exudate. • In instances of aspiration pneumonia, alimentary substances may be found within the lung parenchyma. • Severe instances compounded by abscess formation exhibit loss of lung tissue, replaced by confluent sheets of neutrophils.
Prognosis • Recovery is typically anticipated with suitable antibiotic therapy in an otherwise healthy individual.
Complications encompass respiratory failure, septicaemia, pleural effusion, empyema, and lung abscess. These occurrences are more probable with pathogenic organisms or in people with concurrent cardiac and pulmonary conditions.
Definition: An infection of the lung parenchyma induced by bacterial pathogens.
Classification • Acquired inside the community. • Nosocomial. • Aspiration. • Immunosuppression.
Epidemiology • Extremely prevalent.
Microbiology • Community-acquired pathogens: Streptococcus pneumoniae, Mycoplasma pneumoniae, Haemophilus influenzae, Legionella pneumophila. • Hospital-acquired: Gram-negative bacteria, such as Klebsiella, Escherichia coli, and Pseudomonas. • Aspiration: a combination of aerobic and anaerobic bacteria. • Immunosuppression: all previously stated possibilities, including viral, mycobacterial, and Pneumocystis infections. Coexisting infections frequently occur in immunosuppressed individuals.
Pathogenesis Bacterial bypass the lung's defenses and initiate infection within the alveoli.
Presentation: • Productive cough, dyspnea, thoracic discomfort, and pyrexia. Macroscopy • The infected lung parenchyma exhibits a firm texture and a yellowish hue. • Purulent exudate may be expelled from minor air passages. The superficial pleura may exhibit signs of pleuritis. Histopathology The alveolar gaps are occupied by an inflammatory infiltrate abundant in neutrophils. Bacterial colonies are frequently discernible within the exudate. • In instances of aspiration pneumonia, alimentary substances may be found within the lung parenchyma. • Severe instances compounded by abscess formation exhibit loss of lung tissue, replaced by confluent sheets of neutrophils.
Prognosis • Recovery is typically anticipated with suitable antibiotic therapy in an otherwise healthy individual.
Complications encompass respiratory failure, septicaemia, pleural effusion, empyema, and lung abscess. These occurrences are more probable with pathogenic organisms or in people with concurrent cardiac and pulmonary conditions.
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Pathology - Chronic obstructive pulmonary disease (COPD)
Definition: A chronic pulmonary ailment marked by dyspnea resulting from poorly reversible and increasing airflow restriction.
Epidemiology • Extremely prevalent. Primarily a condition affecting middle-aged to older adult smokers.
Aetiology • The majority of instances are attributable to smoking. • Instances in younger individuals may result from A-1-antitrypsin deficiency. Pathogenesis Inflammation and scarring of tiny bronchioles are considered the primary cause of airflow obstruction. • An imbalance between proteases and antiproteases leads to the degradation of lung parenchyma, resulting in the dilatation of terminal airspaces (emphysema) and air trapping. • Hyperplasia of mucous glands and the irritative effects of smoking contribute to a productive cough (chronic bronchitis).
Presentation • Abrupt emergence of dyspnea during exertion, occurring against a history of chronic cough and sputum expectoration. • Spirometric analysis generally reveals a diminished FEV1 and a reduced FEV1/FVC ratio (Fig. 5.1). Macroscopy • The lungs exhibit hyperinflation, characterized by thick mucus in the airways and dilated terminal airspaces. • Bullae may be observed.
Histopathology • Persistent inflammation and fibrosis of tiny bronchioles (chronic obstructive bronchiolitis). • Highly pigmented macrophages in respiratory bronchioles (respiratory bronchiolitis). • Enlarged terminal airspaces (emphysema). Larger airways may exhibit mucus gland hyperplasia
.
Prognosis • Progressive deterioration of lung function accompanied by bouts of acute exacerbation resulting from infection, pneumothorax, or pulmonary embolism. • Subsequently, pulmonary hypertension and right ventricular failure manifest. Left ventricular failure frequently coexists with ischemic heart disease. • Mortality frequently associated with a conjunction of respiratory and heart failure
Definition: A chronic pulmonary ailment marked by dyspnea resulting from poorly reversible and increasing airflow restriction.
Epidemiology • Extremely prevalent. Primarily a condition affecting middle-aged to older adult smokers.
Aetiology • The majority of instances are attributable to smoking. • Instances in younger individuals may result from A-1-antitrypsin deficiency. Pathogenesis Inflammation and scarring of tiny bronchioles are considered the primary cause of airflow obstruction. • An imbalance between proteases and antiproteases leads to the degradation of lung parenchyma, resulting in the dilatation of terminal airspaces (emphysema) and air trapping. • Hyperplasia of mucous glands and the irritative effects of smoking contribute to a productive cough (chronic bronchitis).
Presentation • Abrupt emergence of dyspnea during exertion, occurring against a history of chronic cough and sputum expectoration. • Spirometric analysis generally reveals a diminished FEV1 and a reduced FEV1/FVC ratio (Fig. 5.1). Macroscopy • The lungs exhibit hyperinflation, characterized by thick mucus in the airways and dilated terminal airspaces. • Bullae may be observed.
Histopathology • Persistent inflammation and fibrosis of tiny bronchioles (chronic obstructive bronchiolitis). • Highly pigmented macrophages in respiratory bronchioles (respiratory bronchiolitis). • Enlarged terminal airspaces (emphysema). Larger airways may exhibit mucus gland hyperplasia
.
Prognosis • Progressive deterioration of lung function accompanied by bouts of acute exacerbation resulting from infection, pneumothorax, or pulmonary embolism. • Subsequently, pulmonary hypertension and right ventricular failure manifest. Left ventricular failure frequently coexists with ischemic heart disease. • Mortality frequently associated with a conjunction of respiratory and heart failure
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Pathology - Nasopharyngeal Diseases
Nasopharyngeal angiofibroma is a rare benign soft tissue tumor that only affects young guys, with a peak onset age of 15 years. • Histology reveals a highly vascular neoplasm with variable diameter arteries surrounded by a cellular fibrous stroma. The lesion is covered by an intact sinonasal epithelium. Local recurrence occurs in 720% of cases after surgery.
Nasopharyngeal carcinoma is a malignant epithelial tumor that develops in the nasopharynx. Adults may have nasal congestion, hearing loss, or tinnitus. • Incidence varies geographically, with southern China, Thailand, and the Philippines having higher rates. • Strong link between EBV and nutrition. • Histology classifies tumors into three types: non-keratinizing, keratinizing, and basaloid. Radiation therapy is typically used to treat the majority of instances. 5-year survival rate: 60%
Nasopharyngeal angiofibroma is a rare benign soft tissue tumor that only affects young guys, with a peak onset age of 15 years. • Histology reveals a highly vascular neoplasm with variable diameter arteries surrounded by a cellular fibrous stroma. The lesion is covered by an intact sinonasal epithelium. Local recurrence occurs in 720% of cases after surgery.
Nasopharyngeal carcinoma is a malignant epithelial tumor that develops in the nasopharynx. Adults may have nasal congestion, hearing loss, or tinnitus. • Incidence varies geographically, with southern China, Thailand, and the Philippines having higher rates. • Strong link between EBV and nutrition. • Histology classifies tumors into three types: non-keratinizing, keratinizing, and basaloid. Radiation therapy is typically used to treat the majority of instances. 5-year survival rate: 60%
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Pathology - Pathologies of the larynx
Vocal chord nodules are benign neoplasms of the laryngeal mucosa. Nodules mainly occur in young women and are linked to vocal abuse. • Exhibit alterations in vocalization. • Minor lesions located in the central third of both vocal cords. Histology reveals a lump with an edematous stroma that subsequently turns fibrotic.
Vocal fold polyp is a non malignant proliferation of the laryngeal mucosa. • Manifestations can arise at any age and are equally prevalent among genders. • Exhibits alterations in vocal quality. • Pertains to the ventricular space or Reinke's space of a single vocal chord. Histology reveals a polyp characterized by a stroma that may exhibit variable oedema, myxoid, hyaline, or fibrous properties.
Laryngeal amyloidosis is a localized variant of amyloidosis. • Typically occurs in the false vocal cords. • Manifestations include alterations in vocal quality. Histological analysis reveals the accumulation of amorphous eosinophilic substance behind the epithelium. Amyloid exhibits staining with Congo Red and reveals chromatic alterations under polarized light. The amyloid typically originates from light chain immunoglobulins.
Squamous papillomas is a predominant benign laryngeal neoplasms. • Linked to human papillomavirus (HPV) types 6 and 11. Bimodal age of incidence: under 5 years and between 20 to 40 years. • Exhibit alterations in vocalization. Histology reveals branching exophytic papillary fronds enveloped by non-descript squamous epithelium. • Pediatric patients typically exhibit a more aggressive disease with early recurrences and an increased likelihood of metastasis outside the larynx. • Adult patients generally demonstrate a more favorable prognosis with less frequent recurrences.
Squamous cell carcinoma is a predominant malignant tumor of the larynx. • Predominantly affects older persons, with a preference for males. • Correlation with tobacco and alcohol misuse. • Exhibits alterations in vocal quality. Histological examination reveals infiltrating nests of malignant epithelial cells with squamous differentiation. • Prognosis is contingent upon the stage of the tumor at presentation.
Vocal chord nodules are benign neoplasms of the laryngeal mucosa. Nodules mainly occur in young women and are linked to vocal abuse. • Exhibit alterations in vocalization. • Minor lesions located in the central third of both vocal cords. Histology reveals a lump with an edematous stroma that subsequently turns fibrotic.
Vocal fold polyp is a non malignant proliferation of the laryngeal mucosa. • Manifestations can arise at any age and are equally prevalent among genders. • Exhibits alterations in vocal quality. • Pertains to the ventricular space or Reinke's space of a single vocal chord. Histology reveals a polyp characterized by a stroma that may exhibit variable oedema, myxoid, hyaline, or fibrous properties.
Laryngeal amyloidosis is a localized variant of amyloidosis. • Typically occurs in the false vocal cords. • Manifestations include alterations in vocal quality. Histological analysis reveals the accumulation of amorphous eosinophilic substance behind the epithelium. Amyloid exhibits staining with Congo Red and reveals chromatic alterations under polarized light. The amyloid typically originates from light chain immunoglobulins.
Squamous papillomas is a predominant benign laryngeal neoplasms. • Linked to human papillomavirus (HPV) types 6 and 11. Bimodal age of incidence: under 5 years and between 20 to 40 years. • Exhibit alterations in vocalization. Histology reveals branching exophytic papillary fronds enveloped by non-descript squamous epithelium. • Pediatric patients typically exhibit a more aggressive disease with early recurrences and an increased likelihood of metastasis outside the larynx. • Adult patients generally demonstrate a more favorable prognosis with less frequent recurrences.
Squamous cell carcinoma is a predominant malignant tumor of the larynx. • Predominantly affects older persons, with a preference for males. • Correlation with tobacco and alcohol misuse. • Exhibits alterations in vocal quality. Histological examination reveals infiltrating nests of malignant epithelial cells with squamous differentiation. • Prognosis is contingent upon the stage of the tumor at presentation.
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Pathology - Acute Respiratory Distress Syndrome
Definition: A critical form of acute lung injury characterized by a PaO2:FiO2 ratio of less than 200 mmHg, accompanied by bilateral alveolar infiltrates on chest X-ray, and occurring in the absence of left ventricular failure.
Epidemiology: Rare occurrence.
Aetiology • Any significant lung injury may result in acute respiratory distress syndrome (ARDS). • Frequent etiologies encompass acute pneumonia, shock, trauma, numerous transfusions, and near-drowning. Pathogenesis • Significant lung injury results in extensive alveolar necrosis, severely disrupting normal gas exchange.
Presentation
• Intense dyspnea accompanied by indications of the underlying etiology. Macroscopy • Both lungs are generally significantly heavy and fluid-filled, frequently exceeding 1000g each (a normal lung weighs 730–400g). Histopathology • The histopathological signature is diffuse alveolar destruction, defined by hyaline membranes lining the alveolar spaces. • Hyaline membranes consist of a mixture of fibrin and necrotic alveolar epithelial cells.
Prognosis: A grave condition with fatality rates ranging from 30% to 50%, contingent upon the underlying etiology. • Survivors typically exhibit persistent pulmonary functional impairments.
Definition: A critical form of acute lung injury characterized by a PaO2:FiO2 ratio of less than 200 mmHg, accompanied by bilateral alveolar infiltrates on chest X-ray, and occurring in the absence of left ventricular failure.
Epidemiology: Rare occurrence.
Aetiology • Any significant lung injury may result in acute respiratory distress syndrome (ARDS). • Frequent etiologies encompass acute pneumonia, shock, trauma, numerous transfusions, and near-drowning. Pathogenesis • Significant lung injury results in extensive alveolar necrosis, severely disrupting normal gas exchange.
Presentation
• Intense dyspnea accompanied by indications of the underlying etiology. Macroscopy • Both lungs are generally significantly heavy and fluid-filled, frequently exceeding 1000g each (a normal lung weighs 730–400g). Histopathology • The histopathological signature is diffuse alveolar destruction, defined by hyaline membranes lining the alveolar spaces. • Hyaline membranes consist of a mixture of fibrin and necrotic alveolar epithelial cells.
Prognosis: A grave condition with fatality rates ranging from 30% to 50%, contingent upon the underlying etiology. • Survivors typically exhibit persistent pulmonary functional impairments.
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Pathology - Respiratory failure
Definition: Arterial pO2
Definition: Arterial pO2
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Cystic fibrosis
Definition: An hereditary condition resulting from a mutation in the cystic fibrosis transmembrane conductance regulator (CFTR) gene.
Epidemiology • The predominant fatal genetic disorder among European people. Approximately 1 in 2,500 infants born in the United Kingdom (UK) are diagnosed with cystic fibrosis (CF). Genetics: Inherited in an autosomal recessive fashion. The CFTR gene is located on chromosome 7q and encodes a chloride ion channel. More than 1,400 variants have been identified, with the most prevalent being a deletion at position 508 that results in the loss of a phenylalanine amino acid (the ZF508 mutation). The ZF508 mutation induces improper folding of the CFTR protein, leading to its breakdown within the cell. • Alternative mutations may yield a properly situated protein, however with dysfunctional activity. The absence of normal CFTR leads to impaired electrolyte transport across epithelial cell membranes, leading in the production of viscous mucus discharges.
Presentation • The majority of patients exhibit lung illness resulting from recurrent infections. Initially, typical bacteria inhabit the lungs; nevertheless, Pseudomonas aeruginosa frequently emerges as the predominant organism. Additionally, pancreatic insufficiency is prevalent. • Bowel obstruction might arise during the newborn period due to thick meconium (meconium ileus) or manifest later in childhood. • Liver illness manifests at a later stage. • Certain cases may be identified when elevated serum immunoreactive trypsin is detected during newborn screening.
Macroscopy • Lungs from older children typically have extensive bronchiectasis. • The liver may present with steatosis and, in severe instances, may be cirrhotic. Histopathology The lungs exhibit bronchiectatic airways filled with viscous mucus. Acute inflammation may occur in the presence of an active infection. The liver has thickened bile within the intrahepatic bile ducts. Periportal fibrosis may occur, which can advance to cirrhosis in more severe instances.
Prognosis: The average lifespan is presently approximately 35 years. • The majority of individuals succumb to pulmonary illness.
Definition: An hereditary condition resulting from a mutation in the cystic fibrosis transmembrane conductance regulator (CFTR) gene.
Epidemiology • The predominant fatal genetic disorder among European people. Approximately 1 in 2,500 infants born in the United Kingdom (UK) are diagnosed with cystic fibrosis (CF). Genetics: Inherited in an autosomal recessive fashion. The CFTR gene is located on chromosome 7q and encodes a chloride ion channel. More than 1,400 variants have been identified, with the most prevalent being a deletion at position 508 that results in the loss of a phenylalanine amino acid (the ZF508 mutation). The ZF508 mutation induces improper folding of the CFTR protein, leading to its breakdown within the cell. • Alternative mutations may yield a properly situated protein, however with dysfunctional activity. The absence of normal CFTR leads to impaired electrolyte transport across epithelial cell membranes, leading in the production of viscous mucus discharges.
Presentation • The majority of patients exhibit lung illness resulting from recurrent infections. Initially, typical bacteria inhabit the lungs; nevertheless, Pseudomonas aeruginosa frequently emerges as the predominant organism. Additionally, pancreatic insufficiency is prevalent. • Bowel obstruction might arise during the newborn period due to thick meconium (meconium ileus) or manifest later in childhood. • Liver illness manifests at a later stage. • Certain cases may be identified when elevated serum immunoreactive trypsin is detected during newborn screening.
Macroscopy • Lungs from older children typically have extensive bronchiectasis. • The liver may present with steatosis and, in severe instances, may be cirrhotic. Histopathology The lungs exhibit bronchiectatic airways filled with viscous mucus. Acute inflammation may occur in the presence of an active infection. The liver has thickened bile within the intrahepatic bile ducts. Periportal fibrosis may occur, which can advance to cirrhosis in more severe instances.
Prognosis: The average lifespan is presently approximately 35 years. • The majority of individuals succumb to pulmonary illness.
