Y Asano

Publications (6)36.88 Total impact

• Source

  Available from: Masatake Fukunami

  Article: Prognostic significance of cardiac (123)I metaiodobenzylguanidine imaging for mortality and morbidity in patients with chronic heart failure: a prospective study.

  H Ogita, T Shimonagata, M Fukunami, K Kumagai, T Yamada, Y Asano, A Hirata, M Asai, H Kusuoka, M Hori, N Hoki
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  ABSTRACT: To determine whether cardiac iodine-123 metaiodobenzylguanidine ((123)I MIBG) imaging is useful in predicting the prognosis of patients with chronic heart failure. Cardiac (123)I MIBG imaging was done on entry to the study. The cardiac MIBG washout rate was calculated from anterior chest view images obtained 20 and 200 minutes after injection of the isotope. Study patients were divided into two groups with washout rates above and below 27% (the mean value + 2 SD obtained in 20 normal subjects), and were then followed up. Tertiary referral centre. 79 patients with chronic heart failure in whom the left ventricular ejection fraction was less than 40%. There were 37 patients in group 1 (washout rate of >/= 27%) and 42 in group 2 (< 27%). During a follow up period of between 1 and 52 months, eight patients died suddenly and five died of worsening heart failure in group 1, while none died in group 2; 13 patients in group 1 and four in group 2 were admitted to hospital for progressive heart failure. Kaplan-Meier analysis showed that group 1 had a significantly higher mortality and morbidity (p = 0.001 and p < 0.001, respectively) than group 2. Cardiac (123)I MIBG washout rate seems to be a good predictor of prognosis in patients with chronic heart failure.
  Heart (British Cardiac Society) 12/2001; 86(6):656-60. · 4.22 Impact Factor
• Article: Effect of atrial septal pacing on P-wave duration dispersion and atrial late potentials in patients with paroxysmal atrial fibrillation.

  T Yamada, M Fukunami, T Shimonagata, K Kumagai, Y Asano, A Hirata, M Asai, N Makino, N Hoki
  The American Journal of Cardiology 11/2001; 88(7):795-8. · 3.37 Impact Factor
• Article: Identification of sinus node dysfunction by use of P-wave signal-averaged electrocardiograms in paroxysmal atrial fibrillation: a prospective study.

  T Yamada, M Fukunami, T Shimonagata, K Kumagai, Y Asano, A Hirata, M Asai, M Hori, N Hoki
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  ABSTRACT: In patients with paroxysmal atrial fibrillation (Paf), the identification of the coexistence of sinus node dysfunction (SND) has therapeutic implications. This study sought to prospectively determine whether SND in patients with Paf would be identified by use of atrial early potential (EP), low-amplitude potentials early in signal-averaged P wave. The study population consisted of 149 patients with Paf. Signal-averaged electrocardiography was recorded with the P-wave-triggering technique. The root mean square voltage for the initial 30 MS and the duration of initial low-amplitude signals < 4 microV of signal-averaged P wave were measured in the vector magnitude. The criteria of EP were defined as "the root mean square voltage for the initial 30 MS < 3.0 microV and the duration of initial low-amplitude signals < 4 microV >22 MS." SND was diagnosed by use of the conventional 12-lead electrocardiography, 24-hour Holter monitoring, and bedside electrocardiographic monitoring. Thirty-eight of 149 patients with Paf had EP. Eighteen (47%) of 38 patients with Paf and EP had SND, whereas SND was found in only 5 (5%) of the other 111 patients with Paf without EP (P <.0001). EP gave a sensitivity of 78% and a specificity of 84% for the detection of SND in patients with Paf. EP would be useful for the identification of SND in patients with Paf.
  American Heart Journal 09/2001; 142(2):286-93. · 4.65 Impact Factor
• Article: Prediction of paroxysmal atrial fibrillation in patients with congestive heart failure: a prospective study.

  T Yamada, M Fukunami, T Shimonagata, K Kumagai, H Ogita, Y Asano, A Hirata, H Masatsugu, N Hoki
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  ABSTRACT: We sought to prospectively determine whether patients with congestive heart failure (CHF) at risk for paroxysmal atrial fibrillation (PAF) could be identified by clinical and study variables including the P-wave signal-averaged electrocardiogram (P-SAECG). Although it is important to assess the risk of developing PAF in patients with CHF, it still remains difficult to predict the PAF appearance in patients with CHF clinically. The study group consisted of 75 patients in sinus rhythm without a history of PAF, whose left ventricular ejection fraction, as measured by radionuclide angiography, was <40%. These patients underwent P-SAECG, echocardiography and 24-h Holter monitoring; in addition, the plasma concentration of atrial natriuretic peptide (ANP) was measured at study entry. An abnormal P-SAECG was found at study entry in 29 of 75 patients. In the follow-up period of 21 +/- 9 months, the PAF attacks documented on the ECG significantly more frequently occurred in patients with (32%) rather than without an abnormal P-SAECG (2%) (p = 0.0002). The plasma ANP level was significantly higher in patients with rather than without PAF attacks (75 +/- 41 vs. 54 +/- 60 pg/ml, p = 0.01), although there were no significant differences in age, left atrial dimension or high grade atrial premature beats between the groups. The multivariate Cox analysis identified that the variables significantly associated with PAF development were an abnormal P-SAECG (hazard ratio 19.1, p = 0.0069) and elevated ANP level > or =60 pg/ml (hazard ratio 8.6, p = 0.018). An abnormal P-SAECG and elevated ANP level could be predictors of PAF development in patients with CHF.
  Journal of the American College of Cardiology 03/2000; 35(2):405-13. · 14.16 Impact Factor
• Source

  Available from: Masatake Fukunami

  Article: Dispersion of signal-averaged P wave duration on precordial body surface in patients with paroxysmal atrial fibrillation.

  T Yamada, M Fukunami, T Shimonagata, K Kumagai, S Sanada, H Ogita, Y Asano, M Hori, N Hoki
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  ABSTRACT: This study sought to investigate whether the spatial dispersion of signal-averaged P wave duration would be increased in patients with paroxysmal atrial fibrillation, by use of precordial mapping of the P wave signal-averaged ECG. The P wave signal-averaged ECG was recorded by the P wave-triggering method from 16 precordial leads in 55 patients with paroxysmal atrial fibrillation and 57 control subjects. As an index of the dispersion of signal-averaged P wave duration, we obtained the difference between the maximum and minimum in 16 recording sites. The dispersion was significantly greater in the patients with paroxysmal atrial fibrillation than the controls (26.6 +/- 9.5 vs 14.8 +/- 6.7 ms, P<0.0001). In 25 patients with symptomatic attacks of paroxysmal atrial fibrillation, the signal-averaged ECG was repeated 1 h after a single dose of orally administered pilsicainide, a new class Ic drug. These patients were prospectively followed-up for 10 +/- 11 months with pilsicainide. The rate of freedom from recurrence of paroxysmal atrial fibrillation attacks was significantly (P<0.0001) higher in patients with whom dispersion was decreased by the single dose (54%[7/13]) than in those in whom dispersion increased (8%[1/12]). Increased dispersion of signal-averaged P wave duration would play an important role in generating paroxysmal atrial fibrillation and would be useful in the prediction of drug efficacy to evaluate the change in dispersion by a single administration of pilsicainide.
  European Heart Journal 02/1999; 20(3):211-20. · 10.48 Impact Factor
• Article: Studies on the carbohydrate metabolism of cariogenic Streptococcus Mutans strain PK1

  T. Yamada, S. Hojo, K. Kobayashi, Y. Asano, S. Araya
  Archives of Oral Biology - ARCH ORAL BIOL. 01/1970; 15(12):1205-1217.