Evaluation of venocutaneous fistula as vascular access for hemodialysis: Examination of 46 limbs of 40 patients.

Introduction: We have previously evaluated the usefulness of venocutaneous fistula (VCF), also called "dermatorrhea." VCF is a technique of blood removal/return by advancing a dialysis cannula to the femoral vein for each hemodialysis session using a fistula created between the great saphenous vein and skin.

Methods: In this study, we evaluated 46 limbs of 40 patients for whom VCF was created at our hospital between May 2017 and April 2022.

Effect of Early Cannulation with Plastic Cannula on Arteriovenous Fistula Patency in Hemodialysis Patients.

Introduction: Plastic cannulas have been used to cannulate arteriovenous fistulas (AVFs) for hemodialysis (HD) in Japan for many years. However, the effect of early cannulation with plastic cannulas on AVF patency is not known.

Objective: We analyzed the relationship between first cannulation time (FCT) and patency rates for AVFs cannulated with plastic cannulas and investigated whether early cannulation with plastic cannulas affects AVF patency.

Ultrasound-guided removal of organized thrombi using biopsy forceps in dialysis patients with arterio-venous access occlusion.

Introduction: As a countermeasure against the organized thrombi frequently observed in vascular access occlusion, we devised a percutaneous excision method for organized thrombi under superficial ultrasound guidance using biopsy forceps. The Radial JawTM 3 (2 mm) biopsy forceps of Boston Scientific Corporation was used. The usefulness of this method was investigated.

A new access, Dermatorrhea, 10 samples of the great saphenous vein.

We devised a method that enables blood removal/return by creating a fistula between the skin and the great saphenous vein to insert the dialysis needle sheath in the femoral vein under ultrasonography guidance with respect to each dialysis. We report the principles, methods, and cases. A skin-great saphenous vein fistula is created under local anesthesia.

Ultrasound-guided endovascular treatment for vascular access malfunction: results in 4896 cases.

Purpose: For the protracted maintenance of vascular access, countermeasures against stenosis are important. Between March 2004 and October 2011 superficial ultrasound-guided percutaneous transluminal angioplasty (PTA) was performed in our hospital for arteriovenous fistula malfunction in 4869 cases in 1011 patients, and the utility of the treatment was assessed on the basis of early results. In cases where vascular intervention was deemed necessary, the procedure was conducted under ultrasound guidance as first option, with fluoroscopy and radiography used additionally as necessary.

Kinetic resolution of racemic α-tert-alkyl-α-hydroxy esters by enantiomer-selective carbamoylation.

Kinetic resolution of sterically hindered racemic α-tert-alkyl-α-hydroxy esters is performed by enantiomer-selective carbamoylation with the t-Bu-Box-Cu(II) catalyst (Box = bis(oxazoline)). The reaction with 0.5 equiv of n-C(3)H(7)NCO is carried out with a substrate-to-catalyst molar ratio of 500-5000 at -20 to 25 °C.

Enantiomer-selective carbamoylation of racemic alpha-hydroxy gamma-lactones with chiral Cu(II) Catalysts: an example of a highly active Lewis acid catalyzed reaction.

Enantiomer-selective carbamoylation of racemic alpha-hydroxy gamma-lactones with half equivalents of isocyanates in the presence of chiral Cu(II) catalysts was studied. Among a series of catalyst bearing chiral bis(oxazoline) (box) and pyridine(bisoxazoline) ligands, [Cu(tBu-box)]X(2) [X=OSO(2)CF(3) (3 a), SbF(6) (3 b)] showed the highest enantioselectivity in the reaction of pantolactone (1 a). Use of n-C(3)H(7)NCO, a small alkyl isocyanate, in CH(2)Cl(2) solution was important to achieve a high level of enantiomer selection.

Isolation and characterization of Acidithiobacillus ferrooxidans strain D3-2 active in copper bioleaching from a copper mine in Chile.

Acidithiobacillus ferrooxidans strain D3-2, which has a high copper bioleaching activity, was isolated from a low-grade sulfide ore dump in Chile. The amounts of Cu(2+) solubilized from 1% chalcopyrite (CuFeS(2)) concentrate medium (pH 2.5) by A.

The oxalate level in ultrafiltrate fluid collected from a dialyzer is useful for estimating the plasma oxalate level in hemodialysis patients.

Background: Patients on chronic hemodialysis are likely to develop secondary hyperoxalemia. It is, however, difficult to measure plasma oxalate levels. To measure plasma oxalate levels, rapid plasma separation, deproteinization, and acidification are essential in preventing the formation of oxalate and the deposition of calcium oxalate within the test tube.

[Comparison of intravenous ascorbic acid versus intravenous iron for functional iron deficiency in hemodialysis patients].

The effect of intravenous ascorbic acid was compared with that of intravenous iron in the treatment of functional iron deficiency, as defined as serum ferritin levels over 300 ng/ml and serum iron levels below 50 microg/dl, in patients on chronic hemodialysis. Thirteen patients on chronic hemodialysis with functional iron deficiency received intravenous injections of ascorbic acid, 100 mg, three times a week, after hemodialysis. The therapy was continued until serum ferritin decreased to below 300 ng/ml (3 months at the maximum).

[The clinical evaluation of maxacalcitol on therapy for secondary hyperparathyroidism of chronic hemodialysis patients].

The spectrum of bone disease in end-stage renal failure is changing, but secondary hyperparathyroidism is still a troublesome complication. The vitamin D3 analog, maxacalcitol, has reduced calcemic action compared to vitamin D3, but show equivalent suppression of parathyroid hormone(PTH) secretion. In the first step of the study, we investigated the severity of secondary hyperparathyroidism in 670 chronic hemodialysis patients, whose age, sex(male/female), and duration on dialysis were 63.