Midterm Exam: NR507/ NR 507 (2023/ 2024 New Update) Advanced Pathophysiology, Exams of Pathophysiology

Download Midterm Exam: NR507/ NR 507 (2023/ 2024 New Update) Advanced Pathophysiology and more Exams Pathophysiology in PDF only on Docsity!

: Midterm Exam: NR507/ NR 507 (2023/ 2024 New

Update) Advanced Pathophysiology |Complete Guide with

Questions and Verified Answers| 100% Correct | Grade A

Guarantee- Chamberlain

Asthma - ANSWERChronic disease due to bronchoconstriction and an excessive inflammatory response in the bronchioles What are 5 s/s of asthma - ANSWERcoughing wheezing shortness of breath rapid breathing chest tightness Pathophysiology of asthma (5) - ANSWER-airway inflammation, bronchial hyper- reactivity and smooth muscle spasm

• excess mucus production and accumulation
• hypertrophy of bronchial smooth muscle
• airflow obstruction
• decreased alveolar ventilation Bronchioles - ANSWERsmaller passageways that originate from the bronchi that become the alveoli 3 layers of the bronchioles - ANSWERinnermost layer middle layer - lamina propria outermost layer lamina propria - ANSWERthe middle layer of the bronchioles structure of the lamina propria - ANSWERembedded with connective tissue cells and immune cells purpose of the lamina propria - ANSWERwhite blood cells are present to help protect the airways

How does the lamina propria effect the lungs in regards to asthma - ANSWERthe WBCs protective feature goes into overdrive causing an inflammatory response that damages host tissue What does the innermost layer of the bronchioles contain - ANSWERcolumnar epithelial ells and mucus producing goblet cells What does the outermost layer of the bronchioles contain - ANSWERsmooth muscle cells what does the outermost layer of the bronchioles do - ANSWERcontrol the airways ability to constrict and dilate alveolar hyperinflation - ANSWERWhen air is unable to move out of the alveolar like it should due to bronchial walls collapsing around possible mucus plug thus trapping air inside how does hyperinflation occur? - ANSWERthe ongoing inflammatory process of asthma produces mucus and pus plug that the bronchial walls collapse around Effect of hyperinflation of the alveolar - ANSWER-expanded thorax and hypercapnia (retention of CO2)

• respiratory acidosis What are two anticholinergic drugs used for asthma - ANSWERtiotropium and ipratropium What do anticholinergics do in the lungs? - ANSWERThese drugs block the effects of the parasympathetic nervous system
• increasing bronchodilation MOA of anticholinergic drugs for asthma - ANSWERthe parasympathetic system is stimulated by the vagal nerve to release acetylcholine which binds to the cholinergic receptors of the respiratory tract to cause bronchial constriction = decreased airflow
• blocking the cholinergic receptors prevents acetylcholine binding preventing the bronchial constriction bronchitis - ANSWERinflammation of the bronchial tubes 3 characteristics of bronchitis - ANSWERbronchial inflammation hypersecretion of mucus chronic productive cough for at least 3 consecutive months for at least 2 successive years

Perfusion - ANSWERThe supply of oxygen to and removal of wastes from the cells and tissues of the body as a result of the flow of blood through the capillaries. results of chronic bronchitis/ low perfusion - ANSWERcyanosis right to left shunting chronic hypoxemia Why is there cyanosis with chronic bronchitis - ANSWERthere is hypoxia due to unfavorable conditions for gas exchange Right to left shunting - ANSWERwhen blood passes from the right ventricle through the lungs and to the left ventricle without perfusion Causes of bronchitis - ANSWER-long term exposure to environmental irritants

• repeated episodes of acute infection (RSV infection in early infancy)
• Factors affecting gestational childhood lung development (preterm birth) Pathogenesis of bronchitis - ANSWER-Exposure to airborne irritants
• Irritant activates bronchial smooth muscle constriction and mucus secretion
• Triggers release of inflammatory mediators from immune cells located in the lamina propria most common irritant with bronchitis is? - ANSWERtobacco product smoke what does long term exposure to irritants promote in bronchitis? (5) - ANSWER- smooth muscle hypertrophy
• hypertrophy and hyperplasia of goblet cells
• epithelial cell metaplasia
• migration of more WBC to site
• thickening and rigidity of bronchial basement membrane What does smooth muscle hypertrophy do in lungs? - ANSWERcauses increased bronchoconstriction Hypertrophy and hyperplasia of goblet cells do what in the bronchials - ANSWERpromotes hypersecretion of mucus What are characteristics of epithelial cell metaplasia? - ANSWERsquamous cells become nonciliated and are less protective; allow passage of toxins and WBCs What does the migration of WBCs to the bronchials do? - ANSWERincreases inflammation of the cite and causes fibrosis in the bronchial wall How does the thickening and rigidity of bronchial basement membranes effect the lungs? - ANSWERleads to further narrowing of the bronchial passageways

What acid-base disorder is seen in chronic bronchitis? - ANSWERrespiratory acidosis how does chronic bronchitis lead to respiratory acidosis? - ANSWERhyperinflation of the alveoli causes CO2 retention Where does air enter the body? - ANSWERnaso and oropharynx (mouth and nose) Where does air go after it passes through the nose and mouth? - ANSWERit passes through the trachea After air passes through the trachea where does it go? - ANSWERgoes into the left or right bronchi Where does air flow after the bronchi? - ANSWERinto the smaller bronchioles Where does air flow after the bronchioles? - ANSWERinto the alveoli Describe how blood flows to become oxygenated - ANSWER- deoxygenated systemic blood flows from the vena cava to R atrium

• Tricuspid valve opens to flow to R ventricle
• Pulmonary semilunar valve opens and blood flows to the alveolar capillaries for gas exchange from the pulmonary trunk and L & R pulmonary arteries
• blood goes from alveolar capillaries to pulmonary veins to return oxygenated blood to the left atrium
• bicuspid valve opens to allow blood to go to left ventricle
• aortic semilunar valve opens and blood goes to the aorta
• aorta pushes oxygenated blood out to the body What is the formula for cardiac output - ANSWERCO = HR x SV cardiac reserve - ANSWERdifference between resting and maximal CO; should be about 4-5x as high but does decrease 1% per year after age 30 What type of relationship does heart rate and stroke volume have? - ANSWERinverse low HR = longer fill time = increase stroke volume high HR = lower fill time = lower stroke volume What is preload? - ANSWERthe degree of stretch on the heart before it contracts/ amount of blood entering the ventricles during diastole average amount of preload? - ANSWER120-130 mls When fibers stretch during diastole how does that effect contraction? - ANSWERcontraction is stronger

What happens when cardiac fibers overstretch during diastole? - ANSWERdecreased contraction due to fibers being unable to snap back What can cause increased preload - ANSWERCHF and hypervolemia What can cause decreased preload - ANSWERcardiac tamponade and hypovolemia What are two common causes of hypovolemia - ANSWERdehydration and hemorrhage Afterload - ANSWERthe amount of resistance to open the semilunar valves and eject of blood from the ventricle what influences afterload (3) - ANSWERventricle wall thickness (muscle strength) arterial pressure (resistance to ejection) ventricle chamber size (blood volume capacity) what can cause an increase in afterload - ANSWERsystemic hypertension valve disease COPD (pulmonary hypertension) what can decrease afterload - ANSWERhypotension or vasodilation what influences cardiac contractility (inotropic state) - ANSWERlevels of electrolytes High levels of ATP level of oxygen available synchronous muscle contraction What electrolytes are used for cardiac muscle contraction? - ANSWERsodium potassium and calcium What increases cardiac muscle contraction - ANSWERsympathetic stimulation; fear anxiety and increased thyroxine what decreases cardiac muscle contraction - ANSWERlow ATP levels; ischemia hypoxia or acidosis Stimulation of what set a resting HR (chronotropic state) - ANSWERparasympathetic system what stimulates the parasympathetic system - ANSWERthe vagus nerve What does the parasympathetic system do? - ANSWERIt releases acetycholine which decreases heart rate and causes vasodilation What can extreme vagal response result in? - ANSWERlife threatening bradycardia

What mediates the sympathetic system - ANSWERepinephrine and norepinephrine What does the sympathetic system promote in the cardiac system - ANSWERvasoconstriction and increased HR What can uncontrolled tachycardia lead to? - ANSWERreduced stroke volume and fatigue What are the two parts of the cardiac cycle? - ANSWERdiastole and systole What causes blood to move from the atria to the ventricles - ANSWERgravity and atriole systole What causes the S1 heart sound? - ANSWERBicuspid/Mitral and Tricuspid valves closing What are the atrioventricular valves? - ANSWERtricuspid and bicuspid (mitral) valves What are the semilunar valves? - ANSWERpulmonary and aortic valves What causes the semilunar valves to open? - ANSWERAs ventricles contract and intraventricular pressure rises, blood is pushed up against the SL valves, forcing them to open ejection fraction - ANSWERmeasurement of the volume percentage of left ventricular contents ejected with each contraction What causes the semilunar valves to close? - ANSWERventricles relax and intraventricular pressure falls, blood flows back from the arteries, and fill the cusps of the semilunar valves What causes the S2 heart sound? - ANSWERclosing of semilunar (aortic and pulmonary) valves What prevents the backflow into the ventricles - ANSWERsemilunar valves Stenosis of heart valve - ANSWERA narrowing of the valve opening, causing turbulent flow and enlargement of the emptying chamber Stenosis of a heart valve, may result in what? - ANSWERNarrowing of the heart valves means that blood moves with difficulty out of the heart. Results may include chest pain, edema in the feet or ankles, and irregular heartbeat. and hypertrophy heart failure - ANSWERcardiac dysfunction caused by the inability of the heart to provide adequate CO resulting in inadequate tissue perfusion

Left sided heart failure characteristic - ANSWERinability of the left ventricle to provide adequate blood flow into systemic circulation Causes of left sided heart failure - ANSWERsystemic hypertension left ventricle MI LV hypertrophy Aortic SL valve or bicuspid valve damage Secondary to right heart failure How does LV hypertrophy lead to left sided heart failure - ANSWERThe hypertrophy is secondary to cardiac damage resulting in an enlarged by weaker structure that holds more blood How does Aortic SL valve or bicuspid valve damage lead to heart failure - ANSWERdamage leads to back flow into the left atrium or ventricle after ejection Biventricular failure - ANSWERunresolved left sided heart failure will increase pressure on the right side of the heart contributing to right sided heart failure as well How does heart failure progress from hypertension? - ANSWER- high systemic vascular pressure causes high after load requires the left ventricle to increase contraction force to eject the blood

• damage causes reduced ejection fraction and left ventricle gets tired and becomes unable to eject normal amount of blood
• increased amount of blood remaining in left ventricle and increased left ventricle preload causes the left atrium unable to eject the normal amount of blood into the left ventricle
• blood volume and pressure backs up into the pulmonary veins
• increased pressure will force fluid from the pulmonary capillaries into the pulmonary tissues What does fluid in the pulmonary tissue result in - ANSWERthe areas are flooded and results in pulmonary edema and dyspnea cor pulmonale - ANSWERright-sided heart failure right sided heart failure - ANSWERinability of the right ventricle to provide adequate blood flow into the pulmonary circulation Causes of right sided heart failure - ANSWER- pulmonary disease
• pulmonary hypertension
• RV MI

• RV Hypertrophy
• pulmonary SLV or tricuspid valve damage
• secondary to left heart failure What is the most common cause of right sided heart failure - ANSWERpulmonary hypertension Progression of right sided heart failure - ANSWER- damage causes the right ventricle to increase contraction force to eject/unload the blood
• over time EF is reduced and right ventricle us unable to eject the normal amount of blood
• the blood remaining in the RV increases and RA preload increases until the RA is unable to eject the normal amount of blood into the RA
• the amount of blood remaining in the right atrium increases causing an increase in RA preload
• blood volum enad pressure then backs up into the vena cava and systemic veins signs and symptoms of right sided heart failure - ANSWERjugular vein distension hepatosplenomegaly peripheral edema Why does hepatosplenomegaly develop in right sided heart failure - ANSWERthe large volume of blood flow through the liver and spleen causes these areas to be engorged why does peripheral edema occur in right sided heart failure - ANSWERIncreased pressure forces fluid from the systemic capillaries into the peripheral tissues and flood those areas High output failure - ANSWERinability of the heart to pump sufficient amounts of blood to meet the circulatory needs of the body despite normal blood volume and cardiac contractility causes of high output failure - ANSWERSevere anemia Nutritional deficiencies Hyperthyroidism Sepsis Extreme febrile state Process of high output failure - ANSWER- impaired oxygen delivery of excessive tissue oxygen demands cause tissue hypoxia
• catecholamines initiation increase HR and stroke volume

• increased cardiac output is produced but depletes cardiac muscle reserve overtime and leads to low output failure over time Troponin-Calcium Binding - ANSWERCalcium binds to troponin on the thin filament sliding filament theory - ANSWERtheory that actin filaments slide toward each other during muscle contraction, while the myosin filaments are still Hematopoiesis - ANSWERformation of blood cells Where does blood cell formation occur in a fetus - ANSWER3 weeks - yolk week 8 - fetal liver and spleen 5th month - bone marrow Blood cell formation in chidren 0-5 years old - ANSWERred marrow of all bones to make blood cells blood cell formation in adults over 20 - ANSWERred marrow in large bones
• illium, vertebrae, cranium, jaw, sternum, ribs, humerus, and femur Erythropietin - ANSWERProduce: Kidney (small amount in liver) Released: Kidney Target: Bone Marrow Functions: Stimulates bone marrow to produce more red blood cells hematopoietic stem cells - ANSWERThe stem cells that give rise to RBC WBC and platelets through the process of haematopoiesis. How does a hematopoietic stem cell produce a red blood cell - ANSWERhematopoietic stem cells produces an unndifferentiated hemocytoblast
• erythropoietin binds to it and createsa a proerythroblast
• cell develops into an erythrocyte 7 days later Erythrocyte function - ANSWERtransport oxygen and carbon dioxide Erythrocyte life span - ANSWER120 days anemia risk factors - ANSWERacute or chronic blood loss, increased hemolysis, inadequate dietary intake or malabsorption, bone marrow suppression, age function of hemoglobin - ANSWERIn red blood cells, carries oxygen from the lungs to body's tissues and returns carbon dioxide from tissues back to lungs. It also maintains the shape of red blood cells.

causes of anemia - ANSWER- impaired RBC production

• excessive blood loss
• increased RBC destruction hemolytic anemia - ANSWERpremature destruction of RBCs causes of hemolytic anemia - ANSWERinfection transfusion reaction hemolytic disease of the newborn (Rh incompatibility) autoimmune reaction drug induced development of anemia due to gastrectomy - ANSWERloss of intrinsic factor from surgery results in the loss of protein necessary for vitamin B12 absorption an can lead to anemia what kind of anemia can result from incorrect blood transfusion - ANSWERhemolytic anemia normocytic normochromic anemia - ANSWERCharacterized by red cells that are relatively normal in size and hemoglobin content but insufficient in number hemolytic anemia is what kind of anemia - ANSWERnormocytic normochromic anemia polycythemia vera - ANSWERcondition characterized by too many erythrocytes; blood becomes too thick to flow easily through blood vessels Kidney Anatomy - ANSWERrenal artery renal vein cortex, medulla, renal pelvis ureter renal pyramid nephron Nephron Anatomy - ANSWER1. glomerulus

2. bowman's capsule
3. collecting duct
4. tubule
5. capillary Bladder anatomy - ANSWER- ureter

• bladder
• urethra reabsorption (kidney) - ANSWERmovement of solutes from filtrate to blood things taken back that were secreted of filtered by the kidney what solutes are typically reabsorbed - ANSWERglucose, ions, amino acids and urea

Where is most of the solute reabsorbed? - ANSWERproximal convoluted tubule What effects amount of water and solute reabsorption - ANSWERADH and aldosterone secretion (kidney) - ANSWERmovement of solutes from blood to filtrate anywhere besides bowman's capsule able to secrete salts, acids, bases and urea directly into the tubule via active or passive transport what is secreted into the tubule depends on what the body needs at that time ex. eating a lot of protein nitrogen waste is a product of protein metabolism (ammonia) liver converts ammonia to urea and the kidneys secreted urea into the tubule for secretion also possible to eliminate products that are in excess in the blood -- potassium, hydrogen, metabolites or medications can secrete things that were too larger to fit through the glomerulus's pore filtration (kidney) - ANSWERmovement of solutes from blood to filtrate at bowman's capsule 20% of the blood that goes through the glomerulus is passed as filtrate into the bowman's capsule depends on the hydrostatic and oncotic pressures/ starling forces between the glomerulus and bowman's capsule hydrostatic pressure: a lot higher in the glomerulus (move into the nephron/bowman's capsule) oncotic pressure: higher in the blood/glomerulus than in the bowman's capsule (move into the blood/glomerulus) hydrostatic pressure is greater so there will be movement into bowman's capsule usually favors the filtrate to go into the bowman's capsule each persons full body is filtered about every 40 minutes Conditions associated with renal failure - ANSWER- congenital abnormalities in the urethral tract development

• kidney and bladder cancer

• infections
• glomerulonephritis
• acute/ tubular necrosis
• AKI vesicoureteral reflux - ANSWERAbnormal ureter-bladder connection allowing retrograde flow of urine from bladder to ureters and/or kidneys renal agenesis - ANSWERunilatral or bilateral failure of the kidneys to develop in utero Potter syndrome - ANSWERSyndrome characterized by bilateral renal agenesis and incompatibility of live birth Wilms tumor - ANSWER- Embryonal kidney tumor associated with defective tumor (WT) genes
• Tumors are typically not clinically diagnosable until age 1-5 even though they are present at birth polycystic kidney disease - ANSWER- Mutant PKD genes cause fluid accumulation in kidney tubules "cysts"
• The cysts can be the size of grapes or oranges and compress and destroy nephrons Why are kidneys and bladders at high risk for cancer - ANSWER- UT is the route of excretion for many toxins and contains highly mitotic cells Descending infection - ANSWERThe blood can carry bacteria from a focus of infection in another part of the body to the kidneys. The bacteria then pass with the urine down the ureters to the bladder. Ascending infection - ANSWER- urethra to bladder, and then to kidney
• due to: bacteria from residual fecal contamination glomerulonephritis - ANSWERinflammation of the glomeruli of the kidney tubular necrosis - ANSWERthe renal tubules cells are highly sensitive to low oxygen levels or presence of toxins and leads to tubular necrosis Causes of tubular necrosis - ANSWER- being post operative
• severe sepsis
• burns
• trauma
• contrast chemical use in medical imaging procedures Pathophysiology of tubular necrosis - ANSWER- ischemia or nephrotoxin exposure occurs to the renal tubules
• inflammation and tubular injury occur

• cast formation and tubular obstruction occurs
• tubular injury, leakage, increased glomerular pressure causes decreased capillary perfusion further decrease in GFR occurs
• oliguria results Acute Kidney Injury - ANSWERSudden decline in kidney function with a decrease in GFR and an increase in plasma creatinine and BUN levels - results in oliguria Prerenal disease - ANSWERdecreased blood flow to and through the kidney prerenal disease causes - ANSWER- hypotension
• decreased cardia output
• decreased blood volume What are most cases of AKI caused by? - ANSWERprerenal issues Intrarenal disease - ANSWERdisease or damage within the kidney Causes of intrarenal disease - ANSWERATN Acute glomerulonephritis postrenal disease - ANSWERobstruction in the lower urinary tract that prevents urine flow from the kidneys Causes of postrenal disease - ANSWERBPH Calculi Inflammation Tumors Chronic kidney disease - ANSWERprogressive, irreversible deterioration in renal function Labs: elevated BUN, Cr Phosphorus. Rx: meds for hypertension, statins, epoetin, diuretics, calcium, LOW protein, low salt, restrict K, phosphorus (no chicken, milk, legumes, carbonated drinks), dialysis. kidney stones - ANSWERSolid crystalline masses formed in the kidney, resulting from an excess of insoluble salts or uric acid crystallizing in the urine; may become trapped anywhere along the urinary tract. kidney stone treatment - ANSWERhigh fluid intake, decreasing dietary intake of stone- forming substances, stone removal causes of kidney stones - ANSWERFamily HX, chronic dehydration and infection, dietary factors, medications, imobility. Stoned more common in men than women usually ages 30/50.

benign prostatic hyperplasia - ANSWERbenign growth of cells within the prostate gland BPH (benign prostatic hyperplasia) - ANSWERAge-associated prostate gland enlargement that can cause urination difficulty. BPH treatment - ANSWER- Alpha-adrenergic antagonists: terazosin, doxazosin

• 5 - alpha reductase inhibitors: finasteride, dutasteride
• Transurethral prostatectomy
• Open prostatectomy pathogenesis of primary glomerulonephritis - ANSWER- infection triggers of immune response to cause formation of antibodies
• antibodies form complexes with the pathogen that should be rapidly phagocytized by WBC
• in glomerulonephritis the Ag-Ab complexes are not phagocytized in a timely manner and continue to circulate in the blood stream
• the Ag-Ab complexes get trapped in the narrow vasculature of the glomerular capillaries
• build up of the Ag-Ab complexes signals that immune system and the complement system and WBC infiltration of the site
• Complement protein with enzymes released by phagocytic cells attack the complexes and cause collateral damage to the glomerular area
• Damage weakens thee glomerular structure and plasma proteins with blood leak into the tubular system and pass out into the urine clinical indicators of glomerulonephritis - ANSWER- proteinuria
• hematuria
• edema
• azotemia
• oliguria
• coagulation cascade activation Why is there edema with glomerulonephritis - ANSWERthe loss of albumin from the bloodstream reduces plasma oncotic pressure and results in edema Azoetmia - ANSWERpresence of elevated plasma creatinine Why is there azoetmia with renal failure? - ANSWERDecreased GFR means waste is remains in the bloodstream and is not excreted Why is there oliguria with renal failure? - ANSWERwhen the glomerual structure has sustained enough damage the nephron structure is no longer functional as a filtration unit

What happens in renal failure when the coagulation cascade is activated - ANSWERfibrin is deposited in the glomerular structure and decreases capillary perfusion by causing blockages and further decreases GFR further blood hydrostatic pressure - ANSWERthe pressure produced by a fluid against a surface filtration (kidney) - ANSWERmovement of solutes from blood to filtrate at bowman's capsule 20% of the blood that goes through the glomerulus is passed as filtrate into the bowman's capsule depends on the hydrostatic and oncotic pressures/ starling forces between the glomerulus and bowman's capsule hydrostatic pressure: a lot higher in the glomerulus (move into the nephron/bowman's capsule) oncotic pressure: higher in the blood/glomerulus than in the bowman's capsule (move into the blood/glomerulus) hydrostatic pressure is greater so there will be movement into bowman's capsule usually favors the filtrate to go into the bowman's capsule each persons full body is filtered about every 40 minutes angiotensin converting enzyme (ACE) - ANSWERan enzyme that converts angiotensin I to angiotensin II What does angiotensin II do? - ANSWERincreases blood pressure by vasoconstriction Role of macrophages - ANSWER-In Innate:

1. Phagocytosis PRR or opsonization w/ complement
2. Secrete Cytokines: Recruit more cells, inflammation, fever, etc.

• In Adaptive:

1. Phagocytosis: opsonization with complement or Abs
2. Secrete cytokines: recruit more cells etc.
3. Antigen presentation: peptides from the broken down pathogen are displayed on surface of the cell.