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Similarities and differences between augmentation index and pulse wave velocity in the assessment of arterial
Insights
Augmentation index (AI) and pulse wave velocity (PWV) assessments of arterial stiffness are correlated. However, AI shows significant gender differences, suggesting separate normal ranges for men and women.
Area of Science:
- Cardiovascular Physiology
- Biomedical Engineering
- Hypertension Research
Background:
- Arterial stiffness is a key indicator of cardiovascular health.
- Familial hypertension predisposes offspring to cardiovascular risks.
- Accurate assessment of arterial stiffness is crucial for risk stratification.
Purpose of the Study:
- To investigate the correlation between augmentation index (AI) and pulse wave velocity (PWV).
- To identify factors contributing to differences between AI and PWV measurements.
- To explore gender-specific variations in arterial stiffness markers.
Main Methods:
- Simultaneous assessment of AI and PWV using the SphygmoCor system.
- Analysis of data from 105 offspring of patients with familial hypertension (aged 19-71).
- Statistical analysis including correlation and regression to identify influencing factors.
Main Results:
- A significant positive correlation was found between AI and PWV (r = 0.29, p < 0.005).
- Women exhibited significantly higher AI than men (p < 0.001), partly explained by height.
- AI was more influenced by heart rate and blood pressure than PWV.
Conclusions:
- AI and PWV are correlated measures of arterial stiffness.
- Significant gender-based differences in AI necessitate separate reference ranges.
- Further research is needed to elucidate other factors influencing gender-specific AI variations.
Abstract:
We investigated whether there was a correlation between the simultaneous assessments of augmentation index (AI) and pulse wave velocity (PWV), undertaken by the SphygmoCor system, and what were the principal factors responsible for differences in these two putative assessments of arterial stiffness, in 105 offspring (41 men, 64 women) aged 19-71 years, of patients with familial hypertension. Arterial stiffness was measured using the SphygmoCor pulse wave analysis system. AI and PWV correlated significantly and positively (r = 0.29, p < 0.005) and the strength of the correlation was greater when each gender was examined separately. This led us to observe several-fold higher AI in women (22.04 +/- 12) than in men (8.59 +/- 13) (p < 0.001); the difference could be explained only in part by an inverse regression correlation between AI and height (r = -0.45; p < 0.001), but not PWV. AI was also more influenced than PWV by heart rate and blood pressure. AI is strongly correlated with a previously validated estimate of arterial stiffness, PWV. It is probable that separate normal ranges should be established for men and women, while further studies determine what parameters other than height are responsible for the gender difference.