Exam 2 Study Guide Flashcards
What are the general Principles of Virology?
a. A virus cannot replicate on its own. It must attach to and enter a host cell.
b. A virus then uses the host cell’s energy to synthesize protein, DNA and RNA.
c. Viruses are difficult to kill because they live inside cells. (Any drug that kills a virus also kills healthy cells)
What is the purpose and use of antiviral drugs?
Kill or suppresses the virus by destroying virions or inhibiting the ability of viruses to replicate; controlled by current antiviral therapy.
What drugs are used to treat influenza?
Amantadine and Rimantadine
Oseltamivir
Amantadine and Rimantadine
Only active against influenza A viruses
Oseltamivir
- Active against influenza A and B.
- Will reduce duration of illness.
- Treatment should begin within two days of influenza onset.
Oseltamivir: Adverse Effects
Nausea and Vomiting
Herpes Zoster (Shingles)
Painful (opioids for pain control)
Follow nerve tracts (dermatitis): usually unilateral
Postherpetic neuralgias
What is used to treat Herpes Zoster (Shingles)?
Acyclovir
Acyclovir
Drug that speeds the recovery of shingles.
Used to suppress replication of HSV-1, HSV-2, and HSV-3.
Best results of acyclovir are seen when?
When the antiviral drug is started within 72 hours of symptom onset.
What are the adverse effects of acyclovir?
Nausea
Diarrhea
Headache
Burning when topically applied
HIV
Retrovirus (uses RNA as its genetic material)
Transmitted by sexual activity, intravenous drug use, perinatally from mother to child
What drugs are used to treat HIV?
Zidovudine
Nevirapine
Both are well tolerated.
What are the adverse effects of zidovudine?
BONE MARROW DEPRESSION
Nephrotoxicity
Hepatotoxicity
Decreased WBC
What are the adverse effects of nevirapine?
Well tolerated. Rash Fever Nausea Headache Abnormal liver function test results
What is the purpose and use of immunosuppressants?
a. Drugs that decrease or prevent immune response, thus suppressing the immune system.
b. Used to prevent or treat rejection of implanted organs or autoimmune disorders.
What are the nursing implications for immunosuppressants?
- Patients taking immunosuppressants should be encouraged to take measures to reduce the risk of infection (i.e Avoid crowds and avoid people with colds or other infections)
- Inform patients to immediately report fever, sore throat, chills, joint pain, fatigue, or other signs of a severe infection.
- Interacts with grapefruit/grapefruit juice
What is an organ transplant?
Transplanted organs have antigens that trigger an immune response -> rejection.
What is azathioprine used for?
Prevents rejection of kidney transplants.
What are the adverse effects of azathioprine?
a. BONE MARROW SUPPRESSION
b. Development of lymphoma and other malignancies
c. Hepatosplenic T-cell lymphoma
What is SLE?
Multisystem autoimmune inflammatory disease.
What is the Pathophysiology of SLE?
Antibodies react with circulating antigen (nucleic acids, erythrocytes, phospholipids, lymphocytes, platelets, etc.) Reaction forms circulating immune complexes.
What are the clinical manifestations of SLE?
a. Photosensitivity, scaly erythmatous: Butterfly skin rash
b. Plaques with follicular plugging
c. Scarring
d. Nonerosive arthritis
e. Pancreatitis
f. Vasculitis
g. Anemia
h. GN
i. Pleural effusion
j. Endocarditis
k. Thrombosis of intracranial vessels
What are the treatment options for SLE?
a. Hydroxychloroquine
b. Glucocorticoids
c. NSAIDs
d. Immunosuppressive Agents
e. Chronic Support – education, counseling, eat well, exercise
What is RA?
a. Autoimmune disorder that causes inflammation and tissue damage in joints.
b. Can also cause anemia, inflammation in lungs, eyes, pericardium, and SQ nodules under the skin.
What are the clinical manifestations of RA?
a. Pain and Stiffness in joints (particularly in the wrist, hands, elbows, shoulders, knees and ankles)
b. Reduced ROM
c. Affects both sides equally
What drugs are used to treat RA?
a. Methotrexate (DMARDs)
b. Entaracept (DMARDs)
What are the adverse effects of methotrexate?
BONE MARROW SUPPRESSION
What are the adverse effects of etanercept?
Headache
Injection Site Reaction
URT Infection
Weakness and Dizziness.
What is MS?
Autoimmune response which causes:
i. Degeneration of CNS myelin
ii. Scarring in brain
iii. Loss of axons
What is the Pathophysiology of MS?
Autoreactive T and B cells cross the blood-brain barrier and recognize myelin and oligodendrocyte autoantigens
Triggers inflammation and loss of oligodendrocytes (myelin producing cells)
Activation of brain macrophages contribute to inflammation and injury with plaque formation and axonal degeneration
Loss of myelin disrupts nerve conduction and death of neurons and brain
What are the clinical manifestations of MS?
a. Paresthesia of the face, trunk or limbs
b. Weakness (all four limbs)
c. Impaired gait
d. Visual disturbances
e. Urinary incontinence
What are the treatment options for MS?
a. Corticosteroids
b. Immunosuppressants
c. Immune system modulators
d. Plasma exchange, Stem cell therapy
e. Regular Exercise, smoking cessation, decreased stress and extreme fatigue
f. Decrease heat exposure
What is hepatitis B?
Milder than Hep C, but can lead to hepatitis or liver failure and death.
How is one exposed to hepatitis B?
Transmitted through blood and body fluid exposure; maternal-baby exchange.
What are the clinical manifestations of hepatitis B?
..
What are the phases of hepatitis?
a. Prodromal
b. Icteric
c. Recovery Phase
What happens during the prodromal phase?
a. Lasts 1-21 days; Begins 2 weeks post exposure.
b. Ends with appearance of jaundice; fatigue, anorexia, malaise, N/V, cough, HA, and low-grade fever.
What happens during the icteric phase?
a. 1-2 weeks after prodromal phase; lasts 2-6 weeks
b. The movement of jaundice occurs.
c. Hepatosplenomegaly, dark urine and clay colored stools.
What happens during the recovery phase?
a. 2-4 months
b. Begins with resolution of jaundice (average 6-8 weeks after exposure)
c. Symptoms diminish but hepatomegaly remains.
What drug is used to treat Hepatitis B?
Telbivudine
What is Telbivudine?
a. Nucleoside analogue reverse transcriptase inhibitor
b. Treats Hep B
What are the adverse effects of telbivudine?
a. Fatigue
b. Headache
c. Diarrhea
d. Nausea
e. Pain in joints and muscles
What is hepatitis C?
a. Responsible for most cases of post-transfusion hepatitis.
b. Also implicated in infections related to IV drug use.
c. No vaccine yet.
How is one exposed to Hepatitis C?
a. 50-80% of hepatitis C cases result in chronic hepatitis.
What are the clinical manifestations of Hepatitis C?
..
What drugs are used to treat Hepatitis C?
a. Interferon
b. Ribavirin
c. Sofosbuvir
What are the adverse effects of interferon?
Fatigue, muscle aches, fever/chills, loss of appetite, SUPPRESSION OF BONE MARROW AND PRODUCTION OF RBCs
Interferon
Stimulates the body’s immune system to clear the virus. Good for acute
What are the adverse effects of ribavirin?
a. Rash
b. Conjunctivitis
c. Anemia
d. Mild Bronchospasm
What are the adverse effects of sofosbuvir?
a. Few side effects: fatigue, headache, nausea and difficulty sleeping.
When sofosbuvir is given with amiodarone, what can happen?
May cause slow HR which can lead to death.
What are the functions of the liver?
- Stores large amounts of blood
- Synthesis of all clotting factors
- vitamin K storage
- Kupffer cells
- Fat synthesization
- Synthesizes phospholipids and cholesterol
- Synthesizes plasma proteins
- Synthesizes serum enzymes
- Gluconeogenesis
- Detoxification
- Storage of minerals and vitamins
- Bile production
What are the clinical manifestations of liver disorders?
a. Portal Hypertension
b. Ascites
c. Hepatic Encephalopathy
d. Jaundice
e. Hepatorenal Syndrome
What are the causes of acute liver failure?
a. Acetaminophen OD
b. Viruses: Hepatitis A, B and C
c. Reaction to prescription/herbal medication
d. Ingestion of wild mushroom
What are the causes of chronic liver failure?
a. Viruses: Especial Hepatitis B and C
b. Hemochromatosis (too much iron storage)
c. Severe malnutrition
d. Long term alcohol consumption
e. Cirrhosis
What is cirrhosis?
a. Irreversible inflammatory disease that disrupts liver function and structure.
b. Normal liver cells are replaced with scar tissue -> fibrosis.
What is the Pathophysiology of cirrhosis?
- Inflammation
- Fibrosis and scarring -> portal HTN, splenomegaly, varices, decreased bilirubin matabloism -> increased unconsummated bilirubin (remains fat soluble) -> jaundice
- Decreased bile in the GI -> light/clay colored stool
- Decreased fat digestion -> decreased Vitamin K -> decreases clotting factors -> increases bleeding tendencies.
- Increased urobilinogen -> concentrated dark urine.
- Decreased protein hormones like angiotensinogen -> activates compensatory
- Increased ammonia and presence of toxic substances -> encephalopathy
What are the treatment options for cirrhosis?
a. Beta Blockers
b. Nitrate
c. Diuretics
d. Lactulose
e. FFP
f. Neomycin/Metronidazole
What are adverse effects of diuretics?
Drop in Ca, take calcium supplements
What are the adverse effects of vitamin K?
a. Pain, swelling, soreness @ injection site
b. Flushing, taste changes, dizziness, rapid heart beat
c. Sweating and SOB
d. Treats and prevents unusual bleeding by increasing body’s production of clotting factors.