Please use this identifier to cite or link to this item: https://hdl.handle.net/11499/5243
Title: Renal vein Doppler ultrasound of maternal kidneys in normal second and third trimester pregnancy
Authors: Karabulut, Nevzat
Yagcı, Ahmet Baki
Karabulut, Aysun
Keywords: adult
article
blood vessel compliance
clinical trial
controlled clinical trial
controlled study
disease classification
Doppler echography
female
gestational age
human
hydronephrosis
kidney
kidney blood flow
kidney disease
kidney vein
major clinical study
oscillation
pathophysiology
pregnancy
prospective study
pyelocaliectasis
second trimester pregnancy
symptomatology
third trimester pregnancy
tissue pressure
ultrasound scanner
ureter obstruction
waveform
Adult
Diagnosis, Differential
Dilatation, Pathologic
Female
Humans
Kidney
Pregnancy
Pregnancy Complications
Pregnancy Trimester, Second
Pregnancy Trimester, Third
Renal Circulation
Renal Veins
Ultrasonography, Doppler, Color
Ureteral Obstruction
Vascular Resistance
Abstract: The flow pattern in intrarenal veins depends on renal parenchymal histology and cardiac physiology. The intrarenal venous impedance index obtained by Doppler ultrasound is related to compliance in vein, and can be helpful in the assessment of renal parenchymal compliance. The purpose of this study was to determine whether normal pregnancy has a significant effect on intrarenal venous blood flow, and assess if the physiological pyelocaliectasis causes a measurable reduction in venous impedance indexes in pregnant women. Doppler ultrasound of intrarenal veins was performed in 35 asymptomatic pregnant women in the second and third trimester of gestation, and in 24 non-pregnant healthy women. After grading the degree of hydronephrosis, venous impedance index was obtained from the interlobar veins. The venous waveforms in pregnant women showed diminished phasic oscillations owing to elevated pre-systolic flow. The mean venous impedance indexes in pregnant women were significantly lower than the values in non-pregnant subjects, 0.30 ± 0.10 versus 0.44 ± 0.06 in the right (p<0.001), and 0.36 ± 0.11 versus 0.41 ± 0.07 in the left kidney (p=0.03). There was an inverse correlation between the grade of pelvicalyceal dilatation and the venous impedance indexes in both kidneys in pregnant women (r=-0.62, p<0.001 for the right kidney, and r=-0.38, p=0.05 for the left kidney). An abnormally reduced venous impedance index in pregnant women can at least in part be explained by reduced vascular compliance from increased interstitial pressure subsequent to partial obstruction of ureters by the gravid uterus, and caution should be exercised in interpreting it as a sign of pathological ureteral obstruction.
URI: https://hdl.handle.net/11499/5243
https://doi.org/10.1259/bjr/81976752
ISSN: 0007-1285
Appears in Collections:PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collection
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Tıp Fakültesi Koleksiyonu
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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