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Biomedical subjects

T Kazui

Publications and source records attributed to T Kazui.

At least 271 records · Page 15Linked to original sources
PubMed1976

A new cannulation method for isolated mitral valve surgery--"apicoaortic-pa" cannulation.

The present paper describes experimental and clinical studies of a new method "Apicoaortic-PA" cannulation for mitral valve surgery. Our experimental study showed that this method was more rapid and more physiological for cardiopulmonary bypass. We used this technique in 55 cases of isolated mitral valve surgery with successful results. Our general philosophy of surgical approach to the mitral valve diseases is also discussed. We advocate the utilization of the "Apicoaortic Pulmonary Artery" cannulation method for clinical use in isolated mitral valve surgery through the left thoracotomy.

Adolescent↗
PubMedDate not supplied

Macrocystic serous cystadenoma of the pancreas: case report.

We report a case of macrocystic serous cystadenoma of the pancreas. The lesion consisted of a large main cyst and several small cysts, and each cyst showed high intensity on T1-weighted and very high intensity on T2-weighted magnetic resonance images. High-intensity cyst contents may be a characteristic, if not a specific, finding of macrocystic serous cystadenoma of the pancreas.

Cystadenoma, Serous↗
PubMedDate not supplied

Coronary ostial aneurysms after composite graft replacement.

Coronary ostial aneurysms after composite graft replacement of the ascending aorta and aortic valve is a rare complication. We report two patients with Marfan syndrome who developed coronary ostial aneurysms at the sites of the coronary anastomosis, presumably because of oversized windows made in the graft. They were successfully treated by redo composite graft replacement. To prevent this complication, it is important to consider that the hole made in the tube graft should not be larger than the diameter of the respective coronary ostium to avoid exposure of the diseased aortic wall to the circulating blood as much as possible, and that the suture used to anastomose the coronary buttons should pass through the rim of the ostium rather than through the aortic wall surrounding it.

Adult↗
PubMedDate not supplied

Redo composite valve graft replacement.

BACKGROUND: Redo composite valve graft replacement remains a challenging problem, that may lead to increased surgical mortality. METHODS: In our experience from September 1976 through December 1999, eight consecutive patients (seven men and 1 woman) underwent eight redo composite valve graft replacements. The mean age at reoperation was 43.1 years (range 31 to 51 years). Seven patients had stigmata of Marfan's syndrome. Reoperation was indicated for pseudoaneurysm formation in five patients, coronary ostial aneurysms in two patients, and active fungal endocarditis in one patient. Previous root replacement had been performed in all eight patients using a composite mechanical valve. The techniques used at previous procedures were the Bentall technique in seven and Carrel's button technique in one. The mean interval between primary root replacement and redo root replacement was 10 years (range 2 to 18 years). The patient with active fungal endocarditis having a stuck valve was subjected to emergency operation. RESULTS: The techniques used at the reoperations included Carrel's button technique in five patients, the interposition technique (Phieler) in two patients, and Cabrol's technique in one patient. Aortic arch aneurysm repair was performed in five patients. There were two hospital deaths (2 [25%] of 8). One patient died on postoperative day 1 with low cardiac output and the other suffered a sudden cardiac arrest on postoperative day 14. The mean follow-up was 34.6 months (range 1 to 85 months). There was one late death. The cause of death was multiple organ failure due to recurrence of fungal endocarditis 6 months after redo composite and total arch replacement. CONCLUSION: Redo composite graft replacement can be accomplished with lower early mortality, and therefore, this operation should not be delayed given the appropriate clinical circumstances. Many causes of failure of composite valve graft replacement can be avoided if the appropriate surgical technique is chosen.

Adult↗
PubMedDate not supplied

A self-tuning effect of membership functions in a fuzzy-logic-based cardiac pacing system.

This paper describes a self-tuning method of membership functions in a fuzzy-logic-based cardiac pacing system and validates its feasibility in a double sensor system which has minute ventilation and oxygen saturation level as its guides for the rate regulation. Though the agreement between the pacing rates (fuzzy rates) calculated with three linguistic variables for each parameter and the target rates were not satisfactory, it was improved significantly by tuning the membership functions. Almost the same evaluated values with those obtained by using six linguistic variables for each parameter were obtained. Time required for the self-tuning process was about 40 s (386CPU, 20 MHz) which was fast enough for the system. The smaller number of linguistic labels results in a smaller number of rules, which is beneficial in implantable cardiac pacemakers with limited memory capacity. A fuzzy-logic-based cardiac pacing system is promising for the realization of custom-made cardiac pacemakers.

Exercise Test↗
PubMedDate not supplied

Emergency graft replacement of the aortic arch for acute type A aortic dissection.

Between May 1988 and December 1990, 7 patients underwent graft replacement of both the ascending aorta and aortic arch for acute type A aortic dissection. Preoperative complications included cardiac tamponade in 5 cases, rupture of the left pleural cavity in 1, and aortic regurgitation in 5. All operations were performed with the aid of extracorporeal circulation and selective cerebral perfusion (SCP) on an emergency basis. Concomitant procedures included aortic cusp suspension in 3 cases, Bentall operation in 2, and CABG in 1. There were no deaths within 1 month of surgery, nor were there serious postoperative cerebral complications. One patient with chronic obstructive lung disease died of pneumonia 5 months after the operation. The other 6 patients are presently leading normal lives with long-term follow-up. The present data suggest that SCP with an open aortic anastomosis is a useful adjunct in aortic arch replacement for acute type A aortic dissection.

Adult↗