Evaluation of resistive index using color Doppler imaging of orbital arteries in geriatric patients with hypertension

Akal, Ali; Ulaş, Turgay; Göncü, Tuğba; Karakaş, Ekrem; Karakaş, Ömer; Kurnaz, Fatih; Boyacı, Nurefşan; Yılmaz, Ömer Faruk; Bata, Abdulgafur; Yıldız, Sema

doi:10.4103/0301-4738.136204

Cited by 10 publications

(13 citation statements)

References 17 publications

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“…As an affirming finding, Karadeniz-Bilgili et al 5 found increased RI values in hypertensive patients compared to healthy subjects. Akal et al 11 found a higher RI of PCA levels and similar OA and CRA levels in geriatric hypertensive patients compared to healthy subjects. The RI of the orbital arteries in hypertensive patients with or without retinopathy has not yet been investigated and compared.…”

Section: Resultsmentioning

confidence: 94%

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Usefulness of color Doppler imaging of orbital arteries in young hypertensive patients

Ravikanth

2019

Baylor University Medical Center Proceedings

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Color Doppler imaging (CDI) is an established method for investigating ocular blood flow characteristics, and several blood flow parameters can be obtained from the velocity wave. This study evaluated CDI parameters in hypertensive subjects by measuring flow velocities, resistive index, and the pulsatility index of ocular arteries. One hundred young hypertensive patients and 50 ageand gender-matched healthy controls were recruited for the study. CDI parameters of the ophthalmic artery, central retinal artery, and posterior ciliary artery were measured in all subjects. Doppler index cutoff points were calculated using area under the curve with 95% confidence intervals. Results showed that Doppler parameters were significantly higher in subjects diagnosed with hypertension in the young compared to controls.

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Section: Resultsmentioning

confidence: 94%

“…healthy controls (Tables 1 and 2). Akal et al 11 evaluated RI values of OA, CRA, and PCA in patients with hypertensive retinopathy and found no significant difference compared to patients without hypertensive retinopathy.…”

Section: Resultsmentioning

confidence: 99%

Usefulness of color Doppler imaging of orbital arteries in young hypertensive patients

Ravikanth

2019

Baylor University Medical Center Proceedings

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“…In patients with hypertension, the RI of the PCA is reported to be high and correlates with duration of hypertension. [ 18 ] Moreover, CDI was performed in erect posture, which might have influenced the results. Few other investigators have noted increased RI values in the OA and CRA in patients with diabetes but without DR compared to that of controls, suggesting that even before the appearance of overt DR, there is increased resistance to blood flow in the peripheral vascular bed.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Resistive Index of Orbital Vessels Using Color Doppler Imaging in Patients with Type 2 Diabetes Mellitus

Kanagaraju

Karuppannasamy

Raajaganesh

et al. 2021

Journal of Medical Ultrasound

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Background: Resistive index (RI), derived from color Doppler imaging (CDI), is a marker of vascular resistance used widely in varied clinical settings. The aim of this study was to analyze the association between RIs of the orbital vessels in a pure cohort of type 2 diabetic patients with or without retinopathy using CDI. Methods: Fifty patients having type 2 diabetes and 50 age-matched controls were evaluated in this prospective study. Diabetic retinopathy (DR) was diagnosed based on seven-field stereo fundus photography and diabetic patients were divided into two. Patients with no DR ( n = 26) were taken as Group 1, while patients with DR ( n = 24) were taken as Group 2. CDI was performed and the RIs of the ophthalmic artery (OA), posterior ciliary artery (PCA), central retinal artery (CRA), and central retinal vein (CRV) were measured. Results: Significant differences were observed in the mean RI values of all orbital arteries between controls and patients with DR ( P < 0.05). Comparison of RI values between controls and Group 1 showed no significant differences. Mean RI values of the PCA and CRA were found to be significantly higher in the patients in Group 2 than in Group 1 ( P = 0.03 and P < 0.001, respectively). The duration of diabetes correlated with the mean RI of all the orbital vessels. RI of the CRA was a reliable predictive indicator for DR ( P = 0.001). Conclusion: RIs of the orbital arteries are significantly higher in patients with DR. RI of the orbital vessels can be a potentially useful biomarker in the early diagnosis and follow-up of patients with DR.

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“…CDI is a useful method to investigate ocular and orbital blood flow characteristics (Aburn and Sergott 1993;Munk et al 1993;Rojanapongpun and Drance 1993;Baxter et al 1995;Dudea 2011) that has been successfully applied in clinical settings for the evaluation of the circulatory status in retinal vascular disorders and glaucoma (Williamson and Harris 1996;Rankin 1999;MacKinnon et al 2000;Akal et al 2014). The topography and direction of the blood flow in many ocular and retro-orbital vessels, such as the external and internal ophthalmic artery, anterior ciliary artery, short and long ciliary arteries and primary retinal artery, have been described clearly in dogs (Gelatt-Nicholson et al 1999a;Lee et al 2002;Novellas et al 2007).…”

Section: Discussionmentioning

confidence: 99%

The effect of moderate treadmill exercise on the resistive index of the medial long posterior ciliary artery in dogs

Pugliese¹,

Ragusa²,

Biondi³

et al. 2019

Vet. Med. - Czech

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The resistive index (RI) is an indirect measurement of arterial resistance by means of a ratio between the peak systolic and end diastolic velocities recorded with a spectral Doppler device, especially used to evaluate the vascular damage in ocular diseases such as glaucoma. Some ocular variables such as the intraocular pressure (IOP), the choroidal thickness, the axial length and the ocular blood flow may be influenced by physical exercise. The purpose of this study was to evaluate the influence of the exercise on the RI of the medial long posterior ciliary artery in dogs, and correlate the data obtained with the IOP values. Ten clinically healthy dogs were subjected to moderate physical exercise on a canine motorised treadmill at different speeds for 45 minutes. A colour Doppler examination was performed and the RI values were calculated for the medial long posterior ciliary artery at rest, immediately after the exercise, and after 60 minutes at the end of the exercise. At the same times, the IOP was recorded by applanation tonometry. The data were analysed by a two-way repeated ANOVA measurement in order to compare the RI and the IOP. Wilcoxon’s test was applied for the post hoc comparison. Spearman’s rank correlation for non-normal distribution was used to determine a relationship between the RI and the IOP. The at rest RI was 0.722 +/–0.022, IOP 12.38 +/3.21 mm Hg. A significant decrease in the RI was observed immediately after the exercise (0.697 +/–0.035) and during the passive recovery phase (0.682 +/–0.042). A significant decrease in the IOP (11+/3.39 mmHg) was recorded after 60 min of the passive recovery phase; at the end of the exercise, a slight decrease (12.29+/4.26 mm Hg) mm Hg was detected. During the test, a linear correlation between the RI and the IOP was observed. Our results suggest that exercise induces the modification of the ophthalmic blood flow in dogs, presumably related to the compensatory neuro-hormonal mechanisms.

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Evaluation of resistive index using color Doppler imaging of orbital arteries in geriatric patients with hypertension

Cited by 10 publications

References 17 publications

Usefulness of color Doppler imaging of orbital arteries in young hypertensive patients

Usefulness of color Doppler imaging of orbital arteries in young hypertensive patients

Evaluation of Resistive Index of Orbital Vessels Using Color Doppler Imaging in Patients with Type 2 Diabetes Mellitus

The effect of moderate treadmill exercise on the resistive index of the medial long posterior ciliary artery in dogs

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