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Articles by A Fujii
Total Records ( 3 ) for A Fujii
  Y Takahashi , A Takahashi , T Kuwahara , T Fujino , K Okubo , S Kusa , A Fujii , A Yagishita , S Miyazaki , T Nozato , H Hikita , K Hirao and M. Isobe
  Background—

We sought to characterize patients with persistent atrial fibrillation (AF) who were successfully treated by ablation targeting the left atrium (LA).

Methods and Results—

Ninety-three patients (58±10 years, 79 male) undergoing ablation of persistent AF were studied. During the first procedure, ablation was performed in the LA and coronary sinus, consisting of pulmonary vein isolation, linear ablation, and electrogram-based ablation. During follow-up after the first procedure, 35 patients (38%) remained free from tachyarrhythmias, 27 patients (29%) had atrial tachycardia, and 31 patients (33%) had AF. Duration of persistent AF according to medical history and whether AF was terminated by ablation were associated with the outcome (P=0.005, P=0.004, respectively). In multivariate analysis, the duration of persistent AF was the only predictor of freedom from AF (sinus rhythm or atrial tachycardia) (odds ratio, 0.80 for a 1-year increase; 95% confidence interval, 0.67 to 0.95; P=0.01). Of 31 patients in whom AF recurred during follow-up, electrogram-based ablation was performed in the right atrium in 26 patients. Sixteen of those patients (62%) remained free from AF during follow-up. Overall, 82% of patients were free from any tachyarrhythmias at 2-year follow-up after a median of 2 procedures.

Conclusions—

Patients with shorter duration of persistent AF were more likely to be free from AF by LA ablation. Right atrial ablation may provide incremental efficacy in patients who are refractory to LA ablation.

  N Mise , Y Tomizawa , A Fujii , Y Yamaguchi and T. Sugimoto
 

IgG4-related systemic disease, including autoimmune pancreatitis, is a multi-organ disorder characterized by elevated serum immunoglobulin G4 (IgG4) concentration and IgG4-positive plasma cell infiltration. We report the case of a 67-year-old man with IgG4-related tubulointerstitial nephritis, presenting with markedly enlarged kidneys and renal dysfunction. The serum IgG4 level was elevated with 4200 mg/dl and pathological examination revealed patchy, clearly fringed areas of IgG4-positive plasma cell infiltration and advanced fibrosis in the renal parenchyma, perirenal tissue and lymph nodes. With oral prednisolone at a dose of 60 mg daily, a contraction of the kidneys and an improvement of renal function were observed. No recurrence of the disease was observed during the reduction of prednisolone to 2 mg daily over 4 years.

  S Kamijo , A Fujii , K Onodera and K. Wakabayashi
 

The KMSKS motif is the ATP binding motif for aminoacylation process of class I aminoacyl-tRNA synthetases. Although researches based on natural proteins inform us about the contribution of natural amino acid sequences for the catalysis, they have difficulties in discussing the other alternative sequences and prohibited sequences for the motif to maintain the catalytic ability. In order to reveal such the conditions for the alternative and prohibited sequences, it is important to investigate a library of various mutants for the motif. For that purpose, we build a library of more than 200 mutants substituting the KMSSS loop, Lys204-Met205-Ser206-Ser207-Ser208, in tyrosyl-tRNA synthetase of Methanococcus jannaschii, and their catalytic abilities were examined by the Amber suppression method. Mutants of K204R and K204N still maintained catalytic abilities to a certain extent. On the other hand, a variety of alternative sequences for Ser206-Ser207-Ser208 were obtained, and some of those did not include either Ser or Thr, which were regarded as necessary residues in the KMSKS motif in previous works. In this article, catalytic activity of all the mutants are represented in detail and some suggestions for the condition of the motif are discussed.

 
 
 
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