Kazuki Oosugi

Mie University, Tu, Mie, Japan

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Publications (5)18.06 Total impact

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    ABSTRACT: An increase in systolic blood pressure (SBP) after hemodialysis (intradialytic-HTN) is associated with adverse outcomes in patients on regular hemodialysis. However, the hemodynamic and Doppler echocardiographic characteristics of intradialytic-HTN and its impact on clinical outcomes are unclear. A retrospective analysis of 84 patients (45 men, 70±9 years) stratified into three groups on the basis of SBP response from pre- to post-hemodialysis: GHTN (intradialytic-HTN, SBP increase 10 mm Hg), GDROP<15 mm Hg (SBP drop <15 mm Hg), and GDROP15 mm Hg (SBP drop 15 mm Hg). Hemodynamic and echocardiographic assessments were performed pre- and post-hemodialysis, and patients were followed for 41±17 months. GHTN had higher blood glucose and lower baseline SBP, serum potassium and total cholesterol. Cardiothoracic ratio was smaller, and peak early diastolic mitral annular velocity (E') was lower in GHTN. During hemodialysis, SBP and diastolic blood pressure increased only in GHTN. After hemodialysis, left ventricular (LV) filling pressure (E/E' ratio) decreased only in GDROP15 mm Hg, resulting in a higher E/E' ratio in GHTN than GDROP15 mm Hg. Multivariate logistic regression analysis revealed a positive correlation between blood glucose and intradialytic-HTN, whereas cardiothoracic ratio, pre-hemodialysis SBP and the change in E/E' ratio with hemodialysis were negatively related to intradialytic-HTN. During follow-up, GHTN had more cardiovascular deaths than GDROP15 mm Hg (P=0.03). Multivariate Cox regression analysis showed that lower serum potassium and previous coronary artery disease, but not intradialytic-HTN, were associated with cardiovascular deaths. A higher LV afterload and elevated filling pressures after hemodialysis, indicative of increased cardiovascular stiffening and impaired diastolic filling, may contribute in part to an increased cardiovascular burden in patients with intradialytic-HTN.
    No preview · Article · Sep 2013 · Hypertension Research
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    ABSTRACT: No consensus exists on the amount of bed rest required after renal biopsy. Moreover, forced prolonged bed rest can be uncomfortable in patients undergoing renal biopsy. To evaluate whether the length of strict bed rest affects the incidence of pain and other complications after renal biopsy. STUDY DESIGN, FACILITY, AND PATIENTS: This single-center retrospective observational study was conducted in 94 consecutive patients undergoing biopsy of a native kidney between November 2005 and December 2006 at Mie University Hospital. The control group was composed of 317 patients who underwent biopsy of a native kidney between January 2001 and October 2005. The incidence of biopsy-related complications was compared between two periods of strict bed rest: 2 h of strict bed rest with no abdominal bandage (November 2005 to December 2006) and 7 h of strict bed rest with an abdominal bandage (January 2001 to October 2005). The primary outcome was the incidence of back pain requiring analgesics. The secondary outcomes were: need for transfusion or hemostatic intervention, decrease of >/=10% in hemoglobin (Hb) after biopsy, macroscopic hematuria, infection possibly related to biopsy, need for single or indwelling bladder catheterization, and other biopsy-related complications. The incidence of back pain requiring analgesics decreased with a shorter period of strict bed rest [7.5% versus 21.1%, odds ratio (OR) 0.30, 95% confidence interval (95% CI) 0.12-0.64, p = 0.004]. Even after adjustment for age, sex, perinephric hematoma size, and number of biopsy punctures, the incidence of back pain decreased significantly (OR 0.34, 95% CI 0.14-0.73, p = 0.01). With a shorter period of strict bed rest, there were no significant differences in bleeding complications (need for transfusion or other hemostatic intervention), decrease of >or=10% in Hb or macroscopic hematuria. However, the need for indwelling bladder catheterization decreased significantly (36.2% versus 50.5%, OR 0.55, 95% CI 0.34-0.88, p = 0.013). Shortening the period of strict bed rest after renal biopsy from 7 h to 2 h decreased the incidence of back pain, but there was no increase in bleeding or other biopsy-related complications. Our findings suggest that a shorter period of strict bed rest can safely reduce discomfort in renal biopsy patients.
    No preview · Article · Aug 2009 · Clinical and Experimental Nephrology
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    ABSTRACT: Renal biopsy is essential for the diagnosis of kidney diseases, but complications, particularly bleeding incidents, remain problematic. To evaluate the frequency of renal biopsy complications, and to reveal clinical and laboratory factors associated with overt bleeding complications, focusing on those available at hospital ward, we conducted a retrospective observational study for the period between 2001 and 2005 at Mie University Hospital in patients who underwent percutaneous renal biopsy of a native kidney. Of a total of 323 patients, 317 met the inclusion criteria. Only one patient (0.3%) required blood transfusion or intervention to stop bleeding. The mean decrease in hemoglobin (Hb) after biopsy was 0.43 +/- 0.7 g/dL. Hb decreased > or =1.0 g/dL in 66 patients (20.8%) and > or =10% in 32 patients (10.1%). On ultrasonography, perirenal hematoma was detected immediately after biopsy in 273 patients (86.1%), and 41 patients (12.9%) showed hematoma > or =2 cm in width. Analgesics were required for back pain in 67 patients (21.1%). Vasovagal response developed in 31 patients (9.8%). Macrohematuria occurred in 12 patients (3.8%). Urinary catheter was used in 161 patients (50.8%). For Hb decrease > or =10% after biopsy, multivariate analysis revealed perirenal hematoma (> or =2 cm) as a significant factor. Other significant factors were prolonged international normalized ratio of prothrombin time, elevated blood pressure on hospital admission, older age, increased serum creatinine level, and steroid use. Perirenal hematoma > or =2 cm on ultrasonography immediately after biopsy might well represent a predictive factor for bleeding complications.
    No preview · Article · May 2009 · Clinical and Experimental Nephrology
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    ABSTRACT: A 69-year-old woman presented with unusual electron microscopic findings. The patient was admitted to ascertain the cause of her persistent proteinuria, and kidney biopsy was performed. While light microscopic findings and immunofluorescence study suggested membranous nephropathy, electron microscopic study showed microspheric particles aggregated in the subepithelial space where electron-dense deposits should have existed. While the microspheric particles could have been unusual and rough deposits, detailed study suggested that the particles could be parts of glomerular podocytes, for example foot processes. This unusual finding was considered as being in a unique clinical course of membranous nephropathy, but a variant of glomerulopathy associated with podocytic infolding, proposed by Joh et al. (J Nephrol 49:61-67, 2007), could not be excluded.
    No preview · Article · Nov 2008 · Clinical and Experimental Nephrology
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    ABSTRACT: Alport syndrome is a hereditary nephropathy that results in irreversible, progressive renal failure. Recent reports suggested that bone marrow transplantation (BMT) has a beneficial, short-term effect on renal injury in Alport (Col4a3(-/-)) mice, but its long-term effects, especially with regard to survival, are unknown. In this study, Alport mice received a transplant of either wild-type or Col4a3(-/-) bone marrow cells. Surprising, laboratory evaluations and renal histology demonstrated similar findings in both transplanted groups. Transplanted cells accounted for >10% of glomerular cells at 8 wk, but type IV collagen alpha3 chains were not detected in glomerular basement membranes of either group by immunofluorescence or Western blot analysis, although Col4a3 mRNA in the kidney could be amplified by reverse transcription-PCR in knockout mice that received a transplant of wild-type bone marrow. Both transplanted groups, however, survived approximately 1.5 times longer than untreated knockout mice (log rank P < 0.05). These data suggested that irradiation, which preceded BMT, may have conferred a survival benefit; therefore, the survival time of knockout mice was assessed after sublethal irradiation (3, 6, and 7 Gy) without subsequent BMT. A strong positive correlation between irradiation dosage and survival time was identified (P < 0.0001). In conclusion, the improved survival observed in Alport mice that received a transplant of wild-type bone marrow might be primarily attributed to as-yet-unidentified effects of irradiation.
    Preview · Article · May 2008 · Journal of the American Society of Nephrology