Medical Knowledge Pathophysiology 2 — Questions and Answers
Question 1: What characterizes chronic obstructive pulmonary disease (COPD)?
- Reversible airflow obstruction
- Progressive irreversible airflow limitation (Correct answer)
- Pulmonary fibrosis
- Pleural effusion
Correct answer: Progressive irreversible airflow limitation
COPD involves progressive, irreversible airflow limitation due to chronic airway inflammation and alveolar destruction (emphysema).
Question 2: Which condition involves autoimmune demyelination in the central nervous system?
- Parkinson's disease
- Multiple sclerosis (Correct answer)
- ALS
- Guillain-Barré syndrome
Correct answer: Multiple sclerosis
Multiple sclerosis causes demyelination of CNS axons, disrupting nerve signal conduction and producing varied neurological deficits.
Question 3: What is the primary cause of most peptic ulcers in the US?
- Stress and diet alone
- H. pylori infection and NSAID use (Correct answer)
- Viral infection
- Autoimmune gastritis
Correct answer: H. pylori infection and NSAID use
The majority of peptic ulcers result from H. pylori infection or NSAID-induced disruption of the protective gastric mucosal barrier.
Question 4: What distinguishes ischemic stroke from hemorrhagic stroke?
- Ischemic involves bleeding; hemorrhagic involves clotting
- Ischemic results from vessel blockage; hemorrhagic from vessel rupture (Correct answer)
- Ischemic affects younger patients; hemorrhagic affects older patients
- Ischemic is less treatable than hemorrhagic
Correct answer: Ischemic results from vessel blockage; hemorrhagic from vessel rupture
Ischemic stroke results from arterial occlusion causing brain infarction, while hemorrhagic stroke results from rupture of a blood vessel.
Question 5: What defines congestive heart failure (CHF)?
- Heart rate too fast for cardiac output
- Heart's inability to pump sufficient blood to meet metabolic demands (Correct answer)
- Infection of the heart muscle
- Clot in a coronary artery
Correct answer: Heart's inability to pump sufficient blood to meet metabolic demands
CHF occurs when the heart cannot maintain adequate cardiac output, causing fluid congestion in the lungs and peripheral tissues.
Question 6: Which electrolyte imbalance is most dangerous in patients with renal failure?
- Hyponatremia
- Hyperkalemia (Correct answer)
- Hypocalcemia
- Hypomagnesemia
Correct answer: Hyperkalemia
Hyperkalemia in renal failure can cause fatal cardiac arrhythmias because the kidneys can no longer excrete excess potassium.
Medical Knowledge Pathophysiology 2
What characterizes chronic obstructive pulmonary disease (COPD)?