Pulsatility and resistance indices in intrarenal arteries of normal adults

Mastorakou, I.; Lindsell, D. R. M.; Piepoli, Massimo F; Adamopoulos, Stamatis; Ledingham, J. G. G.

doi:10.1007/bf00198202

Cited by 28 publications

(24 citation statements)

References 15 publications

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“…Similar findings have been reported in intrarenal arteries of normal kidneys. 23 In the present study, although a decrease in the intranodal blood flow velocities in subjects over 50 years old was noted, the difference between subjects in different age groups was not statistically significant. The RI and PI of the intranodal vessels show significant increases with age.…”

Section: Discussioncontrasting

confidence: 72%

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Power Doppler sonography of normal cervical lymph nodes.

Ying

Ahuja

Brook

et al. 2000

Journal of Ultrasound in Medicine

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This study was undertaken to investigate the vascular patterns and resistance of normal cervical nodes by power Doppler sonography. In 101 subjects who had a sonographic examination of the neck, 1050 lymph nodes were detected. Only central vascularity was found in normal cervical nodes. The degree of vascularity in submental and submandibular nodes was higher than that in other regional nodes. Submental nodes had a higher vascular resistance in association with a lower blood flow velocity than other regional nodes. No significant difference was found in blood flow velocities and vascular resistance between male and female subjects. The vascular resistance increased significantly with age. This study provides a baseline for vascularity within normal cervical nodes, as seen by power Doppler sonography.

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Section: Discussioncontrasting

confidence: 72%

“…Similar findings have been reported in the fine vessels of other organs (i.e., intrarenal and cerebral arteries). [23][24][25] The increase in RI and PI of the vessels within the lymph nodes in older subjects may be related to the increased rigidity of the arterial walls, which decreases the elasticity of the vessel.…”

Section: Discussionmentioning

confidence: 99%

Power Doppler sonography of normal cervical lymph nodes.

Ying

Ahuja

Brook

et al. 2000

Journal of Ultrasound in Medicine

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“…In humans, the examination of renal blood flow by ultrasonography done in the main renal, segmental, interlobar and interlobular arteries has been reported [18,29,36,40]. The peripheral evaluation in the interlobar and the interlobular arteries reflect kidney function better [36].…”

Section: Discussionmentioning

confidence: 99%

“…The sample point size was 1 mm in length. The measurements included systolic maximal velocity (Vmax), diastolic minimal velocity (Vmin), pulsatility index (PI), resistance index (RI) and renal blood flow (RBF) in the main renal artery as well as PI and RI in the interlobar artery [5,9,17,18,35].…”

Section: Methodsmentioning

confidence: 99%

Comparison of Systemic and Renal Hemodynamics Measured by Doppler Ultrasonography in Canine Experimental Hypovolemia.

et al. 1997

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ABSTRACT. The aim of this study was to examine renal hemodynamics at the hypovolemic and recovery phases in two different hypovolemic shock models using Doppler ultrasonography, and to compare this with systemic hemodynamics. In experiment 1, the hypovolemic phase was induced in 6 mongrel dogs by removing arterial blood at 30 ml/kg for 60 min. In the recovery phase, this blood was reinfused at 30 ml/kg over 60 min. In experiment 2, hypovolemia was induced in 12 beagle dogs by rapid blood removal until blood pressure decreased to 40 mmHg and was maintained at this pressure for 30 min. Six of the dogs were then infused with 20 ml/kg hydroxyethyl starch over 5 min, and the other 6 were infused with 60 ml/kg lactated Ringer's solution also over 5 min. Parameters for systemic and renal hemodynamics were measured by using a polygraph and the Doppler method, respectively. The decrease of diastolic blood flow, resulted in an increase of vessel resistance, and was detected in the hypovolemic kidney by the Doppler method. The rapid and large volume infusion of resuscitation fluids was effective for the recovery of both systemic circulation and renal blood flow, however this induced an increase of kidney vessel resistance, a result of the autoregulation mechanism of the kidney. The changes in these parameters at the main renal artery and interlobar artery were similar. MATERIALS AND METHODSExperimental animals: Six adult mongrel dogs (4 males and 2 females; 2-9 years old), weighing 9-13 kg were used in experiment 1. Twelve adult beagles (7 males and 5 females; 2-7 years old), weighing 7-12 kg were used in experiment 2. These dogs were evaluated as clinically normal.Anesthesia: After induction of the general anesthesia with atropine sulfate (0.03 mg/kg, i.m.), flunitrazepam (0.03 mg/ kg, i.v.) and thiamylal sodium (approximately 15 mg/kg, i.v.), the dogs were endotracheally intubated, and anesthesia was maintained with isoflurane. The breathing movements were arrested using vecronium bromide (0.05 mg/kg, i.v., every 30 min), and were changed to mechanical ventilation with a ventilator (KV-2N, Kimura Ikakiki Co., Tokyo, Japan) at an inspired oxygen concentration (FIO 2 ) of 1.0 and a frequency of 16 breaths/min to achieve an arterial carbon dioxide tension (PaCO 2 ) of 35-45 mmHg. Heparin (500 U/kg, i.v.) was given every 30 min.Hemorrhagic shock model: Experiment 1: Hypovolemia was induced in 6 mongrel dogs during a 60 min period by removing arterial blood at 30 ml/kg/hr into a CPD blood transfusion bag (SC-207, TERUMO Co., Tokyo, Japan). The dogs were then observed over a 60-min period in the hypovolemic state. After that, blood was reinfused from the sterile bags at 30 ml/kg/hr for 60 min. Following reinfusion these dogs were again observed for 60 min.Experiment 2: Hypovolemia was induced in 12 beagles by removing blood until the mean arterial pressure (MAP)The primary causes of acute renal failure can be categorized as ischemic or nephrotoxic [4]. Prerenal azotemia is relatively common, particularly in dogs that have und...

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“…Doppler sonography is a nonivasive method of evaluation of local vascular resistance, such as resistance index [RI). Especially, renal RI values are useful for the assesment of renal parenchymal damage and may provide a reliable parameter of renal atherosclerosis [9]. In addition, RI values of intrarenal arteries gives information about severity of target organ damage in diseases as hypertension, diabetes mellitus and chronic renal failure [10].…”

Section: Introductionmentioning

confidence: 99%

Polycystic Ovary Syndrome: The Correlation Between Renal Doppler Ultrasound and Laboratory Parameters

Karadeli¹,

Üçkuyu²,

Çiftçi³

et al. 2016

Ann Clin Anal Med

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ÖzetAmaç: Tansiyonu normal olan üreme çağındaki polikistik over sendromlu (PKOS) kadınlarda sağ ve sol böbrek uzunluğu, parankim kalınlığı, renal arteriyel, venöz kan akımı ölçümlerinde farklılık olup olmadığını araştırmak. Gereç ve Yöntem: Rotterdam kriterlerine göre PKOS tanısı almış 40 kadın olgu ve 36 sağlıklı kadın olgu çalışmaya dahil edildi. Hormonal, biyokimyasal analiz, renal Doppler ultrasonografi yapıldı, sağ ve sol böbrek uzunluğu, parankim kalınlığı, pik sistolik velosite (PSV), rezistiv indeks (RI) ,venöz impedans indeksi(VI), insülin rezistansı, bozulmuş glikoz toleransı, serum lipid konsantrasyonu araştı-rıldı. Student t testi ve pearson korelasyon testi istatistik analiz için kullanıl-dı. Bulgular: Böbreklerin ölçümleri açısından PKOS'lu ve sağlıklı kadınlar arasında fark yoktu. Ana renal arterin pik sistolik velositesi PKOS'lu grupta daha düşüktü. Ana renal venöz impedans PKOS'lu grupta kontrol grubundan daha yüksekti. Ana renal rezistif indeks PKOS'lu grupta daha yüksekti, fakat istatistiksel olarak önemli değildi. Tüm olguları içeren bivariate analizde, ana böb-rek uzunluğu, ana parankim kalınlığı ölçümleri ile BMI, bel kalça oranı, serum açlık glikoz, insülin, LDL, tirgliserit seviyeleri pozitif ilişkiliydi. Tartışma: Biz PKOS'lu normotansif üreme çağındaki kadınlarda böbrek kan akımında deği-şiklikler olduğunu bulduk . Bu bulgular PKOS'un uzun önem renal ve kardiyovasküler komplikasyonlarının sonucunu gösteriyor olabilir. Anahtar KelimelerDoppler Ultrasonografi; Polikistik Over Sendromu Abstract Aim: To investigate whether there is alteration both right and left kidney lenght, parenchymal thickness, renal arterial,venous blood flow measurements in normotensive reproductive age women with polycystic ovary syndrome (PCOS). Material and Method: Forty women with PCOS according to Rotterdam criteria and thirty-six healthy volunteers women were included in our study. Hormonal, biochemical analysis, renal Doppler ultrasonography were performed and were investigated in terms of both left and right renal lenght, parenchymal thickness, peak systolic velocity (PSV), resistive index (RI), venous impedance index (VI), metabolic characteristics having insulin resistance, impaired glucose tolerance, serum lipid concentration. The student t test and pearson corelation test were used for statistical analysis. Results: The measurements for kidneys were not different between women with PCOS and healthy women. The peak systolic velocity of mean renal artery was lower in PCOS group. The mean renal venous impedance also was higher in PCOS group than control group. The mean renal resistive index was slightly higher in PCOS but not statistical significant. In bivariate corelation analyse including all patients, it was seen that BMI, WHR, level of serum fasting glucose, insulin, LDL, trigliserides were positively related with mean renal length and mean parenchymal thickness measurements. Discussion: We found that there was alterations kidney blood flow in normotensive reproductive age women with PCOS. This findings...

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Pulsatility and resistance indices in intrarenal arteries of normal adults

Cited by 28 publications

References 15 publications

Power Doppler sonography of normal cervical lymph nodes.

Power Doppler sonography of normal cervical lymph nodes.

Comparison of Systemic and Renal Hemodynamics Measured by Doppler Ultrasonography in Canine Experimental Hypovolemia.

Polycystic Ovary Syndrome: The Correlation Between Renal Doppler Ultrasound and Laboratory Parameters

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