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Structural changes in the heart and carotid arteries associated with hypertension in humans
A D Hughes1, A M Sinclair, G Geroulakos
1Department of Clinical Pharmacology, St. Mary's Hospital Medical School, Imperial College of Science Technology and Medicine, London, UK.
Insights
Hypertension is linked to thicker carotid artery walls and increased left ventricular mass. These structural changes in blood vessels and the heart highlight hypertension
Area of Science:
- Cardiovascular Medicine
- Vascular Biology
- Clinical Hypertension Research
Background:
- Hypertension is known to cause structural alterations in both the vascular system and the heart.
- Understanding these changes is crucial for managing cardiovascular risk.
Purpose of the Study:
- To investigate the relationship between carotid artery intima-media thickness (IMT) and cardiovascular risk factors in untreated hypertensive patients.
- To assess cardiac structural changes, specifically left ventricular mass index (LVMI), in relation to IMT in hypertensive individuals.
Main Methods:
- Carotid artery intima-media thickness (IMT) was measured using Duplex doppler ultrasonography in 52 untreated patients (20 hypertensive).
- Left ventricular mass index (LVMI) was determined by echocardiography in hypertensive subjects.
- Associations between IMT, age, systolic blood pressure (SBP), diastolic blood pressure (DBP), and LVMI were analyzed.
Main Results:
- Significant associations were found between age and IMT, as well as between SBP/DBP and IMT.
- Hypertensive individuals exhibited significantly greater IMT compared to normotensive individuals.
- A positive association was observed between LVMI and IMT in hypertensive subjects.
- No significant difference in calculated media stress was found between groups, likely due to compensatory changes in carotid artery dimensions.
Conclusions:
- Hypertension is associated with thickening of the carotid artery intima-media and increased left ventricular mass.
- Further research is needed to determine if these cardiac and arterial structural changes result from common underlying factors.
Abstract:
Hypertension is associated with structural changes in the vascular system and in the heart. This study has examined the relationships between carotid artery intima-media thickness and other risk factors in 52 untreated patients (20 hypertensive). Carotid intima-media thickness was measured bilaterally using a Duplex doppler ultrasonic scanner. In the hypertensive individuals the left ventricle was examined by echo-cardiography and the left ventricular mass index determined. There was a significant association between age and IMT, and both SBP and DBP and IMT. The IMT in the hypertensive group was significantly larger than in the normotensive group and in the hypertensive subjects there was a positive association between left ventricular mass index and IMT. There was no significant difference in calculated media stress between the normotensive and hypertensive groups, probably due to a small increase in carotid intima-media area combined with a small reduction in carotid lumen diameter. Hypertension is associated with a thickening of the intima-media of the carotid artery and an increase in left ventricular mass. Whether these changes in cardiac and arterial structure are in response to similar influences remains to be established.