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[Clinical aspects of hypertensive crises]
Insights
Hypertensive crises can cause left ventricular systolic overload, myocardial ischemia, and reduced cerebral blood flow. Prompt diagnosis and treatment are crucial for preventing vascular complications.
Area of Science:
- Cardiology
- Nephrology
- Internal Medicine
Background:
- Hypertensive crises represent a spectrum of severe hypertension with potential for acute end-organ damage.
- Understanding the pathophysiological mechanisms is essential for effective clinical management.
Purpose of the Study:
- To investigate the cardiovascular and cerebrovascular changes associated with hypertensive crises.
- To correlate clinical findings with hemodynamic and biochemical markers.
Main Methods:
- Electrocardiography (ECG) for assessing left ventricular function.
- Phase analysis to evaluate myocardial mechanics.
- Hemodynamic monitoring of peripheral resistance and cardiac output.
- Assessment of cerebral blood flow and resistance.
- Measurement of plasma renin activity and antigen-albumin levels.
Main Results:
- Severe hypertensive crises showed left ventricular systolic overload, intensified coronary circulation, and acute myocardial ischemia on ECG.
- Phase analysis revealed prolonged mechanical systole and increased myocardial index.
- Complicated cases exhibited hypodynamic syndrome with myocardial insufficiency.
- Marked increase in peripheral resistance and heterogeneous cardiac output responses were observed.
- Cerebral blood supply was significantly reduced due to increased cerebral vascular resistance.
- Renin activity correlated directly with crisis severity.
- Acute cerebral and cardiac ischemia were associated with changes in antigen-albumin.
Conclusions:
- Hypertensive crises induce significant cardiovascular and cerebrovascular disturbances.
- Left ventricular dysfunction and myocardial ischemia are key features in severe cases.
- Cerebral hypoperfusion is a critical consequence.
- Renin activity serves as a marker for crisis severity.
- Differentiated and timely treatment can prevent vascular complications.
Abstract:
Hypertensive crises were studied in 80 patients. In severe cases the ECG provided evidence of systolic overloading of the left ventricle with intensification of coronary circulation and development of acute myocardial ischemia. Phase analysis showed prolongation of the mechanical systole with increase of the myocardial index. In more complicated cases there was a more evident hypodynamic syndrome with marked myocardial insufficiency. Hemodynamic disturbance were marked by a sharply increased peripheral resistance with a heterogenous reaction of the cardiac output. Blood supply to the cerebral tissue reduced sharply with an increase in the resistance of cerebral vessels. Renin activity was directly related to the severity of the crisis. A sharp onset of cerebral and cardiac ischemia was marked by changes in the antigen albumin. Timely diagnosis and differentiated treatment made it possible to avoid vascular complications in hypertensive crisis.