2850 Pathophysiology Exam Two Flashcards
Tension headache pathophysiology
Stress induced, and often associated with muscle tension in neck, shoulders, and occipital area
Tension headache: clinical manifestations
Bifrontal or occipitofrontal pain with gradual onset
Pressure or band like pain
Vital signs and neuro exam normal
Tension headache: risk factor
Stress
Cluster headache: pathophysiology
Pathophysiology not entirely understood, but believed to be a neurovascular disorder
Cluster headaches: clinical manifestations
Severe, unilateral pain that is usually periorbital and radiates into the jaw, face, etc Eye tearing Eye redness Runny nose Pupil constriction Restlessness Eyelid edema
Cluster headache: risk factors
Alcohol Tobacco Stress Allergies Weather changes
Migraine headaches: pathophysiology
Pathophysiology not totally understood, but could be due to low serotonin levels in the brain leading to constriction and dilation of blood vessels
Migraine headache: clinical manifestations
Unilateral, vascular, throbbing pain that lasts for 4-72 hours May be preceded by aura Nausea and vomiting Light sensitivity Noise sensitivity
Migraine headache: risk factors
Low serotonin in brain Stress Hormones Smoking Weather Food additives Alcohol Caffeine Fatigue
Lupus: pathophysiology
Formation of autoantibodies that form immune complexes that are deposited in organs and tissues, which triggers an inflammation response that damages organ membranes and microvasculature
Which organs and tissues are most commonly affected by lupus?
Skin
Synovium
Glomeruli
Lungs
Lupus: clinical manifestations
Fatigue Fever Myalgias Arthralgias Butterfly rash Joint inflammation Musculoskeletal pain Splenic enlargement Pleurisy and pleural effusion Vasculitis Pericarditis Anemia Thrombocytopenia Headaches Leukopenia Nephrotic syndrome Raynaud’s phenomenon
Nephrotic syndrome
Hypertension plus hematuria
Ranaud’s phenomenon
Tricolor change in the fingers due to vasospasm of blood vessels
Lupus: risk factors
Genetic predisposition EBV antibodies Being a woman of childbearing age African American, Asian, or Hispanic descent Estrogen Certain prescription medications Environmental elements
Fibromyalgia: pathophysiology
Unknown
Fibromyalgia: clinical manifestations
Long-term, body wide pain affecting joints, muscles, tendons, and soft tissues
Fatigue
Headache
Sleep problems
Depression
Anxiety
Pain at at least 11 out of 18 specific tender points
Fibromyalgia: risk factors
Can affect anyone, but especially women between 20 and 50 years of age
What is the most important function of hemoglobin?
Combining with oxygen in the lungs and releasing it to peripheral tissues
What happens with PaO2 drops below 60 mmHg?
Hemoglobin drops off oxygen molecules too quickly, leading to tissue hypoxia
What is the role of erythropoietin in the stimulation of RBC production?
When bloodstream oxygen gets too low, the kidneys secrete erythropoietin, which stimulates the bone marrow to make red blood cells, increasing the oxygen carrying capacity of blood
What is the ventilation-perfusion ratio (V-Q ratio)?
Ratio of amount of air reaching the alveoli to the amount of blood reaching the alveoli
What is ideal in terms of the VQ ratio?
Equal amounts of air and blood reaching alveoli
What is the built in compensatory mechanism of the lungs to try to match blood flow and ventilation?
When there is little ventilation, pulmonary arterial vessels constrict, redistributing blood flow to better ventilated areas
What is the primary stimulus to control rate and depth of breathing?
Central chemoreceptors
How do central chemoreceptors work?
They sense changes in CO2 levels and blood pH and adjust rate and depth of breathing
Give an example of how breathing will be adjusted based on CO2 and pH
If CO2 levels are high/pH is low, respiration rate and depth will increase
Hypercapnia
High levels of CO2
What is the role of hypercapnia in breathing?
Stimulate breathing process
What is the secondary stimulus of breathing?
Peripheral chemoreceptors
How do peripheral chemoreceptors work as a stimulus to breathing?
Receptors in the aortic arch and carotid artery respond to decreased arterial oxygen and stimulate respiration
Breathing stimulated by peripheral chemoreceptors is known as..
Hypoxic drive
What happens when central chemoreceptors are exposed to high levels of CO2 for long periods of time?
They become less responsive, and peripheral chemoreceptors take over as stimulus for respirations
At what level of SaO2 do peripheral chemoreceptors take over?
60 mmHg
Describe how mycobacterium tuberculosis is passed to other individuals
Inhalation of airborne droplets containing M. Tuberculosis bacilli, which settle in the bronchial tree and proliferate
What is the role of white blood cells in responding to infection with M. Tuberculi?
WBC’s wall off the infected area, forming a lesion called a tubercule (WBCs + bacilli+ fibrotic tissue) which scar tissue forms around, making the bacilli inactive
What happens when M. Tuberculi bacteria continue to multiply?
They break through the scar tissue tubercule and continue to proliferate and spread, becoming active again
What adverse effect happens in tuberculosis infection when macrophages degrade the bacteria?
Enzymes for killing the bacteria also damage the lung tissue, making lung tissue necrotic, and bacteria reinfect the bronchial tree (patient is contagious again)
What are presenting signs and symptoms of pulmonary TB?
Chronic cough with purulent sputum Hemoptysis Weight loss Anorexia Chest pain Fever with night sweats
What are some additional findings in patients with pulmonary TB?
Lung crackles
Enlarged lymph nodes
What populations are at high risk for acquiring TB?
Healthcare workers Urban residents Nursing home residents Prisoners Immunosuppressed patients Those born/living/traveling outside US
What other lifestyle factors increase the risk of acquiring TB?
Living in close quarters with other/infected people Alcoholism ESRD Diabetes Travel to areas where TB is common
What are the top causes/triggers of asthma?
Allergies Viral respiratory infections Exercise Inhaled chemicals Multiple episodes of asthma
What happens in the body (pertaining to asthma) when allergens trigger the immune system?
Bronchial constriction
Inflammation
Increase in size and number of goblet cells that secrete mucus
What is the role of T lymphocytes in the pathophysiology of asthma?
They assist B cells to turn into plasma cells that produce immunoglobin E, which triggers the release of histamines and leukotrienes
What is the role of leukotrienes during an asthma attack?
Responsible for development of bronchoconstriction, bronchial hyperreactivity, edema, and eosinophilia
What substance is stimulated during a viral respiratory infection that can trigger an asthma attack?
IgE directed towards viral antigens
What do viral and bacterial upper respiratory infections commonly cause in someone with asthma?
Bronchospasm and copious mucous production
How can exercise induce an asthma attack?
Provoking loss of heat and water from the tracheobronchial tree
What can exaggerate exercise-induced asthma?
Cold weather
How can inhaled chemicals induce bronchospasm?
They irritate receptors that stimulate a vagar reflex, which includes dizziness, sweating, nausea, fainting
What can multiple episodes of asthma cause in the airways?
Airway remodeling
Describe the process of airway remodeling
Proliferation of respiratory epithelium and hypertrophy of respiratory smooth muscle
What is the result of epithelial cell injury in patients with asthma?
It exposes airway to triggers for hyperreactivity, which can cause more frequent bronchospasm
What are clinical manifestations of asthma?
Wheezing Cough Dyspnea Chest tightness Prolonged exhalation
What is an early sign of airway obstruction?
Prolonged exhalation
What are signs of a severe asthma attack?
Use of accessory muscles
Distant/diminished breath sounds
Diaphoresis
List the signs that a patient is going into respiratory failure
Inaudible breath sounds
Repetitive, hacking cough
Cyanosis
What is the most common etiology of asthma?
Allergy
Which employment settings have the highest risk for exposure to chemical agents that can cause asthma?
Farming Painting Construction Landscaping Janitorial work
What are common triggers of asthma in children?
Viral infections, like rhinovirus or RSV
Define COPD
A combination of chronic bronchitis, emphysema, and hyperactive airway disease. It is a poorly reversible airflow limitation
What are characteristic features of COPD?
Mucus hypersecretion
Hypoxia
Cyanosis
Persistent cough
What are some characteristics of emphysema?
Overdistended alveoli with trapped air
Hyperreactivity in the airways
What is the consequence of overdistended alveoli with trapped air?
Obstruction of expiratory airflow
Loss of alveolar elastic recoil
High residual volume of CO2
Summary: breathing in is okay but breathing out is hard
What happens with hyper reactive airways in emphysema?
Extremely reactive to irritants, leading to episodes of bronchoconstriction
What pathological changes lead to airflow limitation in COPD?
Narrowing
Excessive mucus and fibrosis in airways
Loss of alveolar elastic recoil
Smooth muscle hypertrophy
How are pulmonary structures remodeled in COPD?
Bronchioles are remodeled due to chronic inflammation, thickened bronchiole walls, and constricted lumen
What factors cause the damages to lung structures in COPD?
Leukotrienes
Interleukins
Tumor necrosis
What happens when increased levels of CO2 become chronic in COPD?
Respiratory drive stimulus changes from PCO2 accumulation to low levels of PO2 instead. Hypoxia stimulates breathing
Why must administration of oxygen to patients with COPD be carefully controlled?
Oxygen can depress patient’s independent drive to breathe, leading to respiratory arrest
What are characteristic s/s of COPD?
Dyspnea Cough Wheezing Hypoxia Cyanosis
What cardiac complication can be brought on by COPD?
Right sided heart failure
Why might individuals with COPD develop clubbing of the fingers?
Chronic hypoxia
What is a major cause of COPD?
Smoking
What are additional risk factors/causes of COPD?
Occupational or environmental exposure to chemicals or dust Secondhand smoke exposure Genetic predisposition Connective tissue diseases IV drug use