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"Latar Belakang: Proses hiperfiltrasi yang ditandai sebagai perubahan dinamik Renal Resistive Index (RRI) merupakan mekanisme adaptasi ginjal pasca berkurangnya massa nefron sudah banyak dielaborasi pada ginjal sisa donor transplan pasca nefrektomi. Belum diketahui bagaimana proses hiperfiltrasi dan rentang nilai RRI normal pada ginjal allograft. Tujuan: Membandingkan proses hiperfiltrasi berdasarkan perubahan dinamis nilai RRI, Peak systolic velocity (PSV), and End Diastolic Velocity (EDV) pada pemeriksaan ultrasonografi pasca operasi hingga satu bulan pasca transplantasi pada kelompok ginjal allograft dan ginjal sisa donor pasangan resipien-donor transplantasi ginjal. Metode: Studi prospektif pada 62 subyek yang merupakan 31 pasangan donor dan resipien transplantasi ginjal yang menjalani operasi transplantasi ginjal di RS dr. Ciptomangunkusumo dari Juli 2023 hingga Februari 2024. Pemeriksaan ultrasonografi dilakukan sebelum operasi, hari ke-7 setelah operasi, dan hari ke-30 setelah operasi. Nilai RRI, PSV, dan EDV dinyatakan dalam nilai rerata dan simpangan baku, dengan perbedaan kedua kelompok nilai menggunakan uji t berpasangan. Hasil: Nilai RRI a. segmental ginjal allograft dan ginjal sisa donor secara berturut-turut saat sebelum operasi, tujuh hari pasca operasi, dan tiga puluh hari pasca operasi adalah 0,61 ± 0,06 vs 0,61 ± 0,06 (p < 0,52), 0,62 ± 0,06 vs 0,68 ± 0,06 (p < 0,001), 0,61 ± 0,06 vs 0,67 ± 0,06 (p < 0,001). Nilai RRI a. arcuata ginjal allograft dan ginjal sisa donor secara berturut-turut saat sebelum operasi, tujuh hari pasca operasi, dan tiga puluh hari pasca operasi adalah 0,56 ± 0,05 vs 0,56 ± 0,05 (p < 0,83), 0,58 ± 0,06 vs 0,62 ± 0,07 (p < 0,05), 0,57 ± 0,06 vs 0,62 ± 0,06 (p < 0,001). Tidak terdapat perbedaan signifikan nilai PSV dan EDV kedua grup. Kesimpulan: Hiperfiltrasi pada ginjal allograft terjadi dengan pola serupa dengan ginjal residu donor transplantasi, dengan perbedaan nilai rerata RRI pada kedua kelompok.

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Background: Hyperfiltration, characterized as a dynamic change in the Renal Resistive Index (RRI), is an adaptation mechanism following reduction in nephron mass, has been elaborated on residual kidneys of transplant donors. It is not yet known how the hyperfiltration process is and the range of normal RRI values in allograft kidneys. Objective: To study the difference of RRI, Peak Systolic Velocity (PSV), and End Diastolic Velocity (EDV) dynamic changes of the allograft kidney and the remaining kidney of the donor, pairs of recipient-donor before transplantation until up to one month after transplantation Method: Prospective study of 62 subjects who were 31 pairs of donor and kidney transplant recipients who underwent kidney transplantation at dr. Ciptomangunkusumo- Hospital from July 2023 - February 2024. Ultrasonography is carried out before surgery, seventh day after surgery, and thirtieth days after surgery. RRI, PSV, and EDV is expressed in mean and standard deviation, with differences between two groups are compared using t-paired test. Results: Comparison of RRI value of segmental artery of allograft kidney and donor residual kidney, before surgery, seventh day, and thirtieth day post nephrectomy/transplantation consecutively are 0,61 ± 0,06 vs 0,61 ± 0,06 (p < 0,52), 0,62 ± 0,06 vs 0,68 ± 0,06 (p < 0,001), 0,61 ± 0,06 vs 0,67 ± 0,06 (p < 0,001). Comparison of RRI value of arcuate artery of allograft kidney and donor residual kidney, before surgery, seventh day, and thirtieth day post nephrectomy/transplantation consecutively are 0,56 ± 0,05 vs 0,56 ± 0,05 (p < 0,83), 0,58 ± 0,06 vs 0,62 ± 0,07 (p < 0,05), 0,57 ± 0,06 vs 0,62 ± 0,06 (p < 0,001). No differences of PSV and EDV values between two groups. Conclusion: Hyperfiltration in allograft kidneys occurs in a similar pattern to transplant donor residual kidneys, with significant differences in mean RRI values between two groups."

"Background: living kidney donation is a safe medical procedure. Kidney function after donation is crucial for donors’ health and quality of life. Kidney hyperfiltration is a compensatory mechanism, which will preserve kidney function after unilateral nephrectomy. The number of studies regarding hyperfiltration in living kidney donors is limited. Our study aimed to explain kidney hyperfiltration mechanism and evaluate its effect on the kidney function within 30 days after surgery. Methods: our study was a prospective cohort study with 46 living-kidney donors participating in the study between April and December 2019. We evaluated main outcomes, the 30-day post-surgery kidney function, which was evaluated by calculating estimated glomerular filtration rate (eGFR) and Urinary Albumin to Creatinine Ratio (ACR). The subjects were categorized into two groups based on their 30-day outcomes, which were the adaptive (eGFR > 60 mL/min/1.73 m2 and/or ACR > 30 mg/g) and maladaptive (eGFR < 60 mL/min/1.73 m2 and/or ACR > 30 mg/g) groups. A series of evaluation including calculating the renal arterial resistive index (RI) and measuring urinary vascular endothelial growth factor (VEGF), neutrophil gelatinase-associated lipocalin (NGAL), and heparan sulfate (HS) levels were performed before surgery and serially until 30 days after surgery. Multivariate analysis with adjustments for confounding factors was done. Results: forty donors were included and mostly were female (67.5%). The average age and body mass index (BMI) were 45.85 (SD 9.74) years old and 24.36 (SD 3.73) kg/m2 , respectively. Nineteen donors (47.5%) had maladaptive hyperfiltration outcomes. The hyperfiltration process was demonstrated by significant changes in renal arterial RI, urinary VEGF, NGAL, and HS levels (p<0.005). There was no significant difference regarding RI, urinary VEGF, NGAL, and HS levels between both groups. Several confounding factors (BMI over 25 kg/m2 , familial relationship, age over 40 years old, and arterial stiffness) were significantly influenced by kidney hyperfiltration and outcomes (p<0.05). Conclusion: the hyperfiltration process does not affect the 30-day post-nephrectomy kidney function of the donors. Several other factors may influence the hyperfiltration process and kidney function. Further study is necessary to evaluate kidney function and its other related variables with a longer period of time study duration."