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[Carotid sinus and cardiopulmonary baroreceptor reflex in patients with hypertension]
Insights
Hypertensive patients exhibit altered baroreceptor reflex responses, including reduced bradycardia and increased vasodilation. These changes correlate with disease duration and involve both heart rate and blood vessel regulation.
Area of Science:
- Cardiovascular physiology
- Autonomic nervous system function
- Baroreceptor reflex mechanisms
Context:
- Labile hypertensive disease (HD) affects autonomic regulation.
- Understanding baroreceptor reflex dysfunction is crucial for managing hypertension.
- Previous research indicates altered cardiovascular reflexes in hypertensive individuals.
Purpose:
- To investigate the sinocarotid and cardiopulmonary baroreceptor reflex characteristics in patients with labile hypertensive disease.
- To compare baroreceptor reflex responses between hypertensive patients and healthy individuals.
- To determine the relationship between baroreceptor reflex alterations and disease duration in hypertension.
Summary:
- Activation of sinocarotid baroreceptors resulted in less pronounced bradycardia in hypertensive patients compared to controls.
- Lower body decompression revealed greater blood pressure reduction in hypertensives, attributed to vasodilation.
- A direct correlation was observed between the decline in the cardiochronotropic baroreflex component, the presence of its vasomotor component, and the duration of hypertensive disease.
- Hypertensive individuals demonstrated an augmented vasoconstrictor cardiopulmonary baroreceptor reflex.
Impact:
- Findings highlight impaired baroreceptor reflex sensitivity in labile hypertension.
- The study suggests a potential role for baroreceptor dysfunction in the pathophysiology of hypertensive disease.
- Results may inform the development of targeted therapeutic strategies for managing hypertension by addressing autonomic dysregulation.
Abstract:
The nature of sinocarotid and cardiopulmonary baroreceptor reflex was examined in 33 patients with labile hypertensive disease (HD). The mechanic receptors of the sinocarotid area was activated by a neck barochamber; lower extremity decompression was used to test the vasoconstrictor cardiopulmonary baroreflex. The studies demonstrated that the activation of the mechanic receptors led to less severe bradycardia in hypertensives than in healthy persons. At the same time blood pressure fall with a decrease in neck chamber pressure achieved higher values in the patients than in normotensives, which was due to vasodilation in most patients. A direct relation was proved to exist between the degree of a decrease in the cardiochronotropic baroreflex component, presence of its vasomotor component, and disease duration. The hypertensives displayed increased in vasoconstrictor cardiopulmonary baroreceptor reflex.