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Biomedical subjects

T Tahata

Publications and source records attributed to T Tahata.

96 records · Page 6Linked to original sources
PubMed1985

[Mitral valve replacement with preservation of whole papillary muscles and chordae tendineae].

A total of 20 patients underwent mitral valve replacement (MVR) with preservation of the papillary muscles (PM) and chordae tendineae (CT) with the object of maintaining left ventricular contractility and decreasing the risk of left ventricular rupture after surgery. The patients comprised of 8 males and 12 females whose ages ranged from 33 to 67 years. In 8 patients, the posterior leaflet was left in place and in 12, the CT to the anterior leaflet were also preserved by excision of the central portion and reattachment of the rest of the leaflet to the appropriate commissural regions. St. Jude Medical valves were exclusively employed as a substitute. Reasons for MVR were isolated MR in 12 cases, MRs in 5 and MSr in 3. There were one operative, one hospital and one late death respectively. Postoperative C.I. increased from 2.65 +/- 0.48 to 3.8 +/- 0.75 ml/min./M2 and LVEF increased from 55.1 +/- 11.4 to 63.4 +/- 13.4%. The area method showed marked improvement of segmental wall motion in anterolateral regions. Chordal shortening also disclosed improvement in long axis. Preservation of papillary muscles and chordae tendineae during MVR has been found to have a beneficial effect on postoperative left ventricular contractility.

Adult↗
PubMedDate not supplied

Surgical treatment of aneurysm or dissection involving the ascending aorta and aortic arch, utilizing circulatory arrest and retrograde cerebral perfusion.

Recently we replaced the ascending aorta and aortic arch in 8 patients with aneurysm or dissection, using profound hypothermic circulatory arrest with retrograde cerebral perfusion. There were no operative deaths. Open aortic anastomosis facilitated repair of the aortic arch without clamping the arch tributaries, and embolism due to particulate debris from clamping of the arch vessels was eliminated. Retrograde cerebral perfusion during profound hypothermic circulatory arrest is a simplified technique that may protect the brain. This method offers advantages over previously described methods, particularly in obviating dissection of the arch tributaries and the clamping thereof, and in protecting the central nervous system.

Aged↗
PubMedDate not supplied

Repair of intracardiac defects associated with congenitally corrected transposition of the great arteries.

From October 1976 to June 1986, 12 patients with corrected transposition of the great arteries (c-TGA) underwent repair of associated intracardiac defects. Ventricular septal defect (VSD) was closed by the method of de Leval in 7 patients, pulmonary outflow tract obstruction was relieved by valvotomy in 2, and bypassed by an external valved conduit in 6. The systemic atrioventricular (A-V) valve was replaced in 2. There was one operative death, giving a mortality rate of 8%. None of the patients developed complete heart block. The ejection fraction of the systemic ventricle was impaired (29-38%), particularly after ventriculotomy of this chamber. Surgical repair of intracardiac defects associated with c-TGA currently can be performed with acceptable risk, and de Leval's method for VSD closure is recommended; but the possibility of the postoperative development of systemic ventricular dysfunction and A-V valve regurgitation necessitates careful follow-up.

Adolescent↗
PubMedDate not supplied

Comparison of D10-value accuracy by the limited Spearman-Karber procedure (LSKP), the Stumbo-Murphy-Cochran procedure (SMCP), and the survival-curve method (EN).

The decimal reduction time (D10) may be determined by any of several methods, including the limited Spearman-Karber procedure (LSKP), the Stumbo-Murphy-Cochran procedure (SMCP), and the survival-curve method (EN). The International Organization for Standardization (ISO) endorses the LSKP and the EN. Most Japanese and German industries utilize the SMCP and the EN for calculation of the D value. A presentation at an ISO meeting suggested that the SMCP was less accurate than the LSKP, and the ISO recommended abandoning the SMCP. The paper concerning the accuracy comparison among these methods has not been published. Therefore, in order to examine whether the SMCP was truly inferior to the LSKP, the Japanese delegates to the ISO compared the accuracies of D10 values obtained with these methods by simulation and in experimental procedures using a biological indicator (BI) and a biological indicator evaluator resistometer (BIER) with ethylene oxide gas sterilization. The results indicate that the SMCP was not consistently less accurate than the LSKP in determining D10.

Colony Count, Microbial↗