Chapter 22. Typical Pathological Forms of the Circulatory System
21 topics with concise breakdowns: definitions, key facts, and class questions.
In this chapter, we examine the fundamental mechanisms of cardiovascular dysfunction. The section covers the entire cascade of hemodynamic catastrophes, from the systemic level down to the microvasculature.
The material is divided into three key blocks. The first focuses on coronary insufficiency: ischemia, angina pectoris, myocardial infarction, cardiomyocyte injury, and the insidious reperfusion syndrome. The second block details arrhythmias, heart blocks, and the pathogenesis of heart failure. The third block covers vascular pathology: various types of arterial hypertension (neurogenic, endocrine, renal), essential hypertension, hypotension, and classic peripheral circulation disorders—arterial and venous hyperemia, and microcirculatory disorders.
In seminars and exams, the mechanisms of heart failure, the etiopathogenesis of essential and secondary hypertension, and the electrophysiological basis of arrhythmias are tested most rigorously. Pay special attention to reperfusion syndrome—this is a favorite "trick" question on tests and exams.
What is the difference between compensated and uncompensated circulatory insufficiency?
In the compensated form, signs of impairment are detected exclusively under load. In the uncompensated stage, hemodynamic disturbances are detectable even at rest.
What is the main danger of unstable angina?
This form is fraught with the development of myocardial infarction. In it, ischemic episodes steadily increase in frequency, duration, and severity, and attacks may begin even at complete rest.
Which diagnostic methods demonstrate organic vascular narrowing in myocardial infarction?
The main imaging method is coronaroangiography. On coronary angiograms, physicians can clearly identify significant local narrowing, i.e., stenoses, of the lumen of at least one coronary artery.
What is the difference between functional and organic narrowing of the coronary vessels?
Organic narrowing is associated with physical remodeling and wall thickening (atherosclerosis, hypertrophy, fibrosis). Functional narrowing is a spasm, i.e., temporary contraction of the vessel's muscle without altering its baseline anatomy.
Why does intracellular acidosis occur during ischemia?
Due to a lack of oxygen, cells are forced to switch to anaerobic glycolysis. A side effect of this compensatory mechanism is the accumulation of lactate, which shifts the pH toward the acidic side.
What effect does reperfusion have on the heart muscle?
Reperfusion has a dual effect: adaptive (positive) and pathogenic (negative).
Master the entire topic in the "Pathophysiology" course
This is a summary. The course covers everything tested in classes and exams.
4,913 pages of study guides on all topics
Assignments and quizzes after every topic — just like in a colloquium