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Effectiveness of pulsatility index of carotid Doppler ultrasonography to predict cardiovascular events

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Abstract

Purpose

The pulsatility index (PI) obtained from carotid ultrasonography is considered to be a marker of cerebrovascular resistance. However, the impact of PI on cardiovascular events has yet to be fully addressed.

Method

Fifty-four patients who underwent both carotid ultrasonography and coronary angiography were followed for 5.9 ± 3.2 years. The relationship between the incidence of cardiovascular events and PI was investigated.

Result

There were 10 (19%) deaths, four (7%) cardiovascular deaths, and nine (17%) major adverse cardiovascular events (MACEs). The cardiovascular events—defined as all hospitalization for MACEs plus heart failure, revascularization, and cardiovascular surgery—occurred in 21 patients (39%). The patients were divided into two groups according to each threshold of PI value for common carotid arteries (CCA), internal carotid arteries (ICA), and external carotid arteries (ECA), respectively. The thresholds were calculated based on receiver-operating characteristic curves for cardiovascular events. Log-rank test showed that the groups with CCA-PI ≥ 1.71, ICA-PI ≥ 1.20, and ECA-PI ≥ 2.46 had a higher incidence of cardiovascular events, respectively (p < 0.05). ECA-PI ≥ 2.46 was associated with an increased incidence of MACEs. Multivariate Cox regression analysis adjusting for cardiovascular risk factors showed that high PI of CCA, ICA, or ECA was a risk factor for cardiovascular events, respectively (CCA-PI ≥ 1.71, hazard ratio (HR) 3.242, p = 0.042; ICA-PI ≥ 1.20, HR 3.639, p = 0.012; ECA-PI ≥ 2.46, HR 11.322, p = 0.001).

Conclusion

The results suggested that carotid PIs were independent predictive factors for further cardiovascular events. In particular, high ECA-PI levels may reflect severe arteriosclerosis.

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Data availability

This manuscript reports the results of clinical trials. The data will not be shared.

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Funding

This research was supported by a grant (to Adachi T) from the Ministry of Defense of Japan and a grant-in-aid for scientific research from the Ministry of Education, Science, and Culture of Japan (to Masaki N) (20K08503).

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Correspondence to Nobuyuki Masaki.

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The authors declare no conflicts of interest.

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This clinical study conformed to the ethical guidelines of the Declaration of Helsinki and was approved by the ethics committee of our institute (No. 1084).

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Hitomi, Y., Masaki, N., Ishinoda, Y. et al. Effectiveness of pulsatility index of carotid Doppler ultrasonography to predict cardiovascular events. J Med Ultrasonics 49, 95–103 (2022). https://doi.org/10.1007/s10396-021-01164-5

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  • DOI: https://doi.org/10.1007/s10396-021-01164-5

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