Rüzgar Miroğlu

Pulmonology 1









Pulmonology lectures

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Unit I. Electrocardiography - Recognition of Dysrhythmias

 

 

 


 

Unit II. Cardiac Rehabilitation - Cardiac Medications - Exercise Prescription For Special Populations

 

Unit Activities Assignment # 1 : Patient Case : Writing A Comprehensive Fitness Program

 

 

 


 

Unit III. Pulmonary Rehabilitation - Pulmonary medications - Pulmonary Function

 

 

 



Primary Right Heart Failure ( Cor Pulmonale)

Cor pulmonale or pulmonary heart disease is enlargement of the right ventricle of the heart as a response to increased resistance or high blood pressure in the lungs.Chronic cor pulmonale usually results in right ventricular hypertrophy (RVH).
There are several mechanisms leading to pulmonary hypertension and cor pulmonale:
* Pulmonary vasoconstriction
* Anatomic changes in vascularization
* Increased blood viscosity
* Idiopathic or primary pulmonary hypertension
Causes
* Acute: – Massive pulmonary embolization,Exacerbation of chronic cor pulmonale
*Chronic: – COPD,Increased pulmonary bloodpressure due to left ventricle insufficiency (Backward failure),Loss of lung tissue following trauma or surgery,Pierre Robin sequence,End stage Pneumoconiosis,Sarcoidosis,Obstructive sleep apnea and Bronchopulmonary dysplasia (in infants)
Cor pulmonale may lead to congestive heart failure (CHF), with worsening of respiration due to pulmonary edema, swelling of the legs due to peripheral edema and painful congestive hepatomegaly.

 

A chest tube (tube thoracostomy) is a flexible plastic tube that is inserted through the side of the chest into the pleural space. It is used to remove air (pneumothorax) or fluid (pleural effusion, blood, chyle), or pus (empyema) from the intrathoracic space. 

 Indications
*Pneumothorax:
*Pleural effusion: Chylothorax, Empyema, Hemothorax, Hydrothorax
Contraindications to chest tube placement include refractory coagulopathy, lack of cooperation by the patient, and diaphragmatic hernia.
Chest tubes are usually inserted under local anesthesia. The skin over the area of insertion is first cleansed with antiseptic solution, such as iodine, before sterile drapes are placed around the area.If necessary, patients may be given additional analgesics for the procedure. Once the tube is in place it is sutured to the skin to prevent it falling out and a dressing applied to the area. Once the drain is in place, a chest radiograph will be taken to check the location of the drain.
Major complications are hemorrhage, infection, and reexpansion pulmonary edema. Chest tube clogging can also be a major complication if it occurs in the setting of bleeding or the production of significant air or fluid.

 

Understanding Dyspnoea

 

Dyspnoea also called shortness of breath (SOB) is a debilitating symptom that is the experience of unpleasant or uncomfortable respiratory sensations.It is a common symptom of numerous medical disorders, particularly those involving the cardiovascular and respiratory systems;Dyspnoea on exertion (or exertional dyspnea) is the most common presenting complaint for people with respiratory impairment.

Pulmonary disorders
* Obstructive lung disease-Asthma,Bronchitis,Chronic obstructive pulmonary disease,Cystic fibrosis,Emphysema
* Diseases of lung parenchyma and pleura
Pneumonia,Fibrosing alveolitis,Atelectasis,Hypersensitivity pneumonitis,Interstitial lung disease,Lung cancer,Pleural effusion,Pneumothorax,Non-cardiogenic pulmonary edema or acute respiratory distress syndrome
* Pulmonary vascular diseases
Pulmonary emboli,Pulmonary hypertension,Pulmonary veno-occlusive disease,Superior vena cava syndrome

Disorders of the cardiovascular system
* Aortic dissection
* Cardiomyopathy
* Congenital heart disease
* Heart failure
* Ischaemic heart disease
* Pericardium disorders, including:Cardiac tamponade,Constrictive pericarditis,Pericardial effusion
* Valvular heart disease

 

Small Cell Lung Cancer and SIADH

 The main types of lung cancer are small cell lung carcinoma and non-small cell lung carcinoma. This distinction is important, because the treatment varies; non-small cell lung carcinoma (NSCLC) is sometimes treated with surgery, while small cell lung carcinoma (SCLC) usually responds better to chemotherapy and radiation.The most common cause of lung cancer is long-term exposure to tobacco smoke.The most common symptoms are shortness of breath, cough and hemoptysis and weight loss.
Small cell lung carcinoma is less common. It was formerly referred to as “oat cell” carcinoma. Most cases arise in the larger airways (primary and secondary bronchi) and grow rapidly.The small cells contain dense neurosecretory granules,which give this tumor an endocrine/paraneoplastic syndrome association.
Depending on the type of tumor, so-called paraneoplastic phenomena may initially attract attention to the disease.In lung cancer, these phenomena may include Lambert-Eaton myasthenic syndrome , hypercalcemia, or syndrome of inappropriate antidiuretic hormone (SIADH).Lung cancer may be seen on chest radiograph and computed tomography (CT scan). The diagnosis is confirmed with a biopsy. This is usually performed by bronchoscopy or CT-guided biopsy. Treatment and prognosis depend upon the histological type of cancer, the stage (degree of spread), and the patient’s performance status.
Small cell lung carcinoma is treated primarily with chemotherapy and radiation, as surgery has no demonstrable influence on survival.
SIADH

 

Pulmonary Embolism

Pulmonary embolism is a blockage of the main artery of the lung or one of its branches by embolism. Usually this is due to embolism of a thrombus from the deep veins in the legs. A small proportion is due to the embolization of air, fat or amniotic fluid. The obstruction of the blood flow through the lungs and the resultant pressure on the right ventricle of the heart leads to the symptoms and signs of PE. The risk of PE is increased in various situations, such as cancer and prolonged bed rest.Symptoms of pulmonary embolism include Dyspnea,Pleuritic chest pain,Anxiety,Cough,Hemoptysis,Sweating,Syncope.Clinical signs include low blood oxygen saturation and cyanosis, rapid breathing, and a rapid heart rate. Severe cases of PE can lead to collapse, abnormally low blood pressure, and sudden death.
Diagnosis is based on these clinical findings in combination with laboratory tests (such as the D-dimer test) and imaging studies, usually CT pulmonary angiography.
 
XRAY findings in PE include
  • Westermark’s sign- A dilation of the pulmonary vessels proximal to the embolism along with collapse of distal vessels, sometimes with a sharp cutoff
  • Hampton’s Hump- A triangular or rounded pleural-based infiltrate with the apex toward the hilum, usually located adjacent to the hilum.

 

Tuberculosis

Tuberculosis is a common infectious disease caused by various strains of mycobacteria, usually Mycobacterium tuberculosis.Tuberculosis usually attacks the lungs but can also affect other parts of the body.
When the disease becomes active, 75% of the cases are pulmonary TB, that is, TB in the lungs. Symptoms include chest pain, coughing up blood, and a productive, prolonged cough for more than three weeks. Systemic symptoms include fever, chills, night sweats, appetite loss, weight loss, pallor, and often a tendency to fatigue very easily.
In the other 25% of active cases, the infection moves from the lungs, causing other kinds of TB, collectively denoted extrapulmonary tuberculosis.This occurs more commonly in immunosuppressed persons and young children. Extrapulmonary infection sites include the pleura in tuberculosis pleurisy, the central nervous system in meningitis, the lymphatic system , the genitourinary system in urogenital tuberculosis, and bones and joints in Pott’s disease of the spine. An especially serious form is disseminated TB, more commonly known as miliary tuberculosis. Extrapulmonary TB may co-exist with pulmonary TB as well.

Acute Respiratory Failure

Acute respiratory failure is defined as inadequate gas exchange by the respiratory system, with the result that arterial oxygen and/or carbon dioxide levels cannot be maintained within their normal ranges. A drop in blood oxygenation is known as hypoxemia[oxygen PaO2 less than 60 mmHg (8.0 kPa)]; a rise in arterial carbon dioxide levels is called hypercapnia[ carbon dioxide PaCO2 greater than 45 mmHg (6.0 kPa)].Classification into type I or type II relates to the absence or presence of hypercapnia respectively.
Type 1 respiratory failure is defined as hypoxaemia without hypercapnia, and indeed the PaCO2 may be normal or low. It is typically caused by a ventilation/perfusion (V/Q) mismatch
Type 1 respiratory failure seen in
* Parenchymal disease (V/Q mismatch)
* Diseases of vasculature and shunts: right-to-left shunt, pulmonary embolism
* interstitial lung diseases: ARDS, pneumonia, emphysema.
Type 2 respiratory failure is caused by increased airway resistance; both oxygen and carbon dioxide are affected.
Emergency treatment follows the principles of cardiopulmonary resuscitation. Treatment of the underlying cause is required. Endotracheal intubation and mechanical ventilation may be required. Respiratory stimulants such as doxapram may be used, and if the respiratory failure resulted from an overdose of sedative drugs such as opioids or benzodiazepines, then the appropriate antidote such as naloxone or flumazenil will be given.
Deep vein thrombosis commonly affects the femoral vein or the popliteal vein or the deep veins of the pelvis. Occasionally the veins of the arm are affected.In many cases the affected area will be painful, swollen, red, warm and the superficial veins may be engorged. The most serious complication of a DVT is that the clot could dislodge and travel to the lungs, which is called a pulmonary embolism (PE). DVT is a medical emergency, present in the lower extremity there is 3% chance of a PE killing the patient. A late complication of DVT is the post-phlebitic syndrome, which can manifest itself as edema, pain or discomfort and skin problems.
Venous thrombosis occurs via three mechanisms: decreased flow rate of the blood, damage to the blood vessel wall and hypercoagulability.The most commonly used tests for the diagnosis of DVT are a blood test called D-dimers and doppler ultrasound of the affected veins.
Pulmonary embolism (PE) is a blockage of the main artery of the lung or one of its branches by a embolised blood clot from elsewhere in the body.Usually this is due to embolism of a thrombus from the deep veins in the legs, a process termed venous thromboembolism.
Symptoms of pulmonary embolism include difficulty breathing, chest pain on inspiration, and palpitations. Clinical signs include low blood oxygen saturation and cyanosis, rapid breathing, and a rapid heart rate. Severe cases of PE can lead to collapse, abnormally low blood pressure, and sudden death.
Diagnosis is based on these clinical findings in combination with laboratory tests and imaging studies, usually CT pulmonary angiography. Treatment is typically with anticoagulant medication, including heparin and warfarin. Severe cases may require thrombolysis or may require surgical intervention via pulmonary thrombectomy.

Wheezing in children

 

Wheeze is a continuous, coarse, whistling sound produced in the respiratory airways during breathing. It is caused by narrowed or obstructed respiratory tree or airflow velocity within the respiratory tree must be heightened. Wheezing is commonly experienced by persons with a lung disease; the most common cause of recurrent wheezing is asthma attacks.The differential diagnosis of wheezing is wide, and the cause of wheezing in a given patient is determined by considering the characteristics of the wheezes and the historical and clinical findings made by the examining physician.

Asthma is a common chronic inflammatory disease of the airways characterized by variable and recurring symptoms, airflow obstruction, and bronchospasm.Symptoms include wheezing, coughing, chest tightness, and shortness of breath.Asthma is clinically classified according to the frequency of symptoms, forced expiratory volume in 1 second (FEV1), and peak expiratory flow rate.Asthma may also be classified as atopic (extrinsic) or non-atopic (intrinsic), based on whether symptoms are precipitated by allergens (atopic) or not (non-atopic).
Medicines such as inhaled short-acting beta-2 agonists may be used to treat acute attacks.Attacks can also be prevented by avoiding triggering factors such as allergens or rapid temperature changes and through drug treatment such as inhaled corticosteroids. Leukotriene antagonists are less effective than corticosteroids, but have fewer side effects.The monoclonal antibody omalizumab is sometimes effective.
 

 

Acute respiratory distress syndrome (ARDS) is associated with diffuse alveolar damage and lung capillary endothelial injury.
Early ARDS is characterized by an increase in the permeability of the alveolar-capillary barrier leading to an influx of fluid into the alveoli.The insults resulting in damage either to the vascular endothelium (eg, sepsis) or to the alveolar epithelium(eg, aspiration of gastric contents). could result in ARDS.
Injury to the endothelium results in increased capillary permeability and the influx of protein-rich fluid into the alveolar space. Injury to the alveolar lining cells also promotes pulmonary edema formation. Two types of alveolar epithelial cells exist. Type I cells, comprising 90% of the alveolar epithelium, are injured easily. Damage to type I cells allows both increased entry of fluid into the alveoli and decreased clearance of fluid from the alveolar space.Damage to type II cells results in decreased production of surfactant with resultant decreased compliance and alveolar collapse. Interference with the normal repair processes in the lung may lead to the development of fibrosis.
Neutrophils are thought to play an important role in the pathogenesis of ARDS.
Cytokines, such as tumor necrosis factor (TNF), leukotrienes, macrophage inhibitory factor,along with platelet sequestration and activation, also are important in the development of ARDS.
ARDS is uniformly associated with pulmonary hypertension. Pulmonary artery vasoconstriction likely contributes to ventilation-perfusion mismatch and is one of the mechanisms of hypoxemia in ARDS. Normalization of pulmonary artery pressures occurs as the syndrome resolves. The development of progressive pulmonary hypertension is associated with a poor prognosis.
ARDS in Children
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