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Biomedical subjects

A Furuse

Publications and source records attributed to A Furuse.

At least 91 records · Page 5Linked to original sources
PubMed1996

[A successful repair of aortic regurgitation and right ventricular aneurysm long after correction of tetralogy of Fallot].

Twenty-seven years after correction of tetralogy of Fallot, a 35-year-old man, suffered from dyspnea on effort and palpitations, underwent repair of aortic regurgitation and right ventricular aneurysm. Aortic regurgitation was due to a perforation at the base of the right coronary cusp, probably caused during the initial VSD patch closure, and it was repaired by suture. The right ventricular aneurysm was excised and the defect was closed directly. After operation, only slight aortic regurgitation was observed and premature ventricular contractions, presumably related to right ventricular aneurysm, were decreased markedly. His postoperative course has been uneventful and satisfactory for these 15 months.

Adult↗
PubMed1996

Successful conduit repair using aortic homograft in a Jehovah's Witness child.

A 10-year-old female child of the Jehovah's Witness faith presented with congenitally corrected transposition of the great arteries (S,L,L), pulmonary atresia, and a ventricular septal defect. A successful surgical correction was performed using an aortic homograft as a valved extracardiac conduit without the use of homologous blood or blood products. We used permanent splinting of the sternum with a methyl methacrylate resin plate to prevent compression of the conduit.

Aorta↗
PubMed1996

[Successful redo-AVR with cryopreserved allograft for prosthetic valve endocarditis : report of a case].

A 20-year-old male undergoing mechanical aortic valve replacement suffered from prosthetic valve endocarditis by Coagulase negative Staphylococci 3 months postoperatively. Echocardiography revealed left ventricular distention, severe paravalvular leakage, valve detachment and large periannular abscess adjacent to the left main coronary artery. Redo-AVR was successfully performed with a cryopreserved aortic allograft by cylinder technique. The orifice of abscess was covered with the aortic wall of the graft. Postoperative echocardiography showed trivial central regurgitation and the abscess cavity went on vanishing. He discharged from hospital 2 months later without any symptom.

Abscess↗
PubMed1996

[Echocardiographic evaluation of hemodynamic function of CarboMedics heart valve in the aortic position in patients with small aortic annuli].

Hemodynamic parameter of CarboMedics heart valve in the aortic position was evaluated using Doppler echocardiography in 46 patients with small aortic annuli. The size of prosthetic valve were 19 mm in 6 cases, 21 mm in 15 and 23 mm in 25. In patients with 19 mm valve, trans-valvular peak pressure gradient was 42.2 +/- 11.8 mmHg, mean pressure gradient was 17.3 +/- 9.3 mmHg, and left ventricular systolic pressure was 174 +/- 12 mmHg. These values were significantly larger than those of the other two groups. Effective orifice area index, discharge coefficient, doppler velocity index and stroke volume showed no significant difference among each group. After aortic valve replacement for aortic stenosis, left ventricular mass decreased to around 70% of preoperative value in all groups, but significant left ventricular hypertrophy remained at two years postoperatively. We conclude that hemodynamic performance of CarboMedics heart valve in the aortic position was satisfactory, although 19 mm valve seemed to be fairly small for adult patients and deliberate patient selection is necessary.

Adult↗
PubMed1996

[Cardiomyoplasty effectiveness: review of the mechanism].

The effectiveness of cardiomyoplasty on cardiac function is discussed, and the four mechanisms proposed to explain cardiomyoplasty effectiveness are reviewed. The first such mechanism, termed the squeezing effect, suggests that skeletal muscle wrapped around the heart squeezes the heart in the same way as cardiac massage, resulting in direct improvement in cardiac function. Hemodynamic improvement is rarely detectable, but significant subjective improvement is commonly seen clinically. The second mechanism, termed the sparing effect, suggests that even if cardiac performance remains unchanged after cardiomyoplasty, contraction of the wrapped lattisimus dorsi muscle causes an increase in the slope of the end-systolic pressure-volume relationship, and a reduction in left ventricular wall stress. Myocardial oxygen consumption is thereby reduced. The third mechanism, called the girdling effect, suggests that cardiomyoplasty may act like an elastic girdle around the heart to prevent enlargement of the failing heart. The fourth mechanism, called the collateral effect, suggests that, when applied to the ischemic heart, cardiomyoplasty increases collateral blood flow to the myocardium, thereby benefiting cardiac function. However, the existence of unknown mechanisms is suggested by two phenomena that cannot be explained by these four mechanisms alone. Cardiomyoplasty was introduced as a method of direct cardiac assistance. However, it now appears that the relatively passive role of cardiomyoplasty in oxygen consumption saving and ventricular enlargement prevention may be of great importance.

Assisted Circulation↗
PubMed1996

[Successful repair for concealed Wolff-Parkinson-White syndrome with atrial septal defect in infancy: a case report].

A 7-month-old girl weighing 5.3 kg, presented with atrial septal defect (ASD) and paroximal supraventricular tachycardia (PSVT). The preoperative electrophysiological study could not be performed because of the severe heart failure. On suspicion of a concealed Wolff-Parkinson-White (WPW) syndrome, whose accessory pathways conduct in the retrograde direction only, the operation was performed. The intraoperative epicardial and endocardial mappings revealed the presence of a left-posterior retrograde accessory pathway. This accessory pathway was successfully ablated by a cryoablation using transseptal superior approach. The postoperative course was uneventful without a permanent heart block. We report a successful surgical repair for an infant with concealed WPW syndrome, who revealed severe heart failure because of PSVT and ASD.

Electrocardiography↗
PubMed1995

Application of a new tactile sensor to thoracoscopic surgery: experimental and clinical study.

BACKGROUND: We developed a new tactile sensor that could quantify the hardness of objects as changes in the resonance frequency of the sensor (delta f). We have applied it to thoracoscopic operations for the localization of small invisible nodules in the lung. METHODS: When the sensor probe was moved over the lung surface, a delta f curve was depicted on the computer screen. When the sensor tip reached a point directly above a hard object, a sudden upward jump of the delta f curve was evoked. After experimental studies using pigs, the sensor was applied in 8 patients. More recently we produced a needle sensor to distinguish small nodules from bronchi that may evoke similar upward jumps of the delta f curve. Eight nodules and four bronchi in resected human lungs were probed directly using this sensor. RESULTS: In all of the patients, the hardness of various thoracic structures could be quantified. A total of 10 nodules were found using the sensor and resected thoracoscopically. The needle sensor distinguished nodules from bronchi, as the mean delta f of the bronchial walls (-64 +/- 45.9 Hz) was significantly higher than that of nodules (-526 +/- 168 Hz, p < 0.001). CONCLUSIONS: Thoracoscopic detection of small and invisible pulmonary nodules using our new tactile sensor is feasible.

Adenocarcinoma↗
PubMed1995

Long-term results of surgical treatment of intracardiac tumors. Effectiveness and limitation of surgical treatment.

Twenty-five cases of intracardiac tumors were operated upon from 1975 through 1994. Twenty-four operative survivors were followed up. The follow-up period ranged from 2 months to 19 years with an average of 8 years. The histological diagnoses of the tumors were as follows: benign tumors 21 (myxoma 20, leiomyoma 1) and malignant tumors 4 (sarcoma 3, carcinoma 1). In 21 cases, tumors had cardiac origins, while there were four intracardiac tumors which had originated in other organs and extended transvenously to the intracardiac cavity (leiomyoma 1, sarcoma 2, carcinoma 1). The results of surgical treatment of intracardiac benign tumors were satisfactory, regardless of their origins and multiplicity, both in the short-term and in the long-term. On the other hand, the long term results for malignant intracardiac tumors were extremely poor, although their excision or resection had a beneficial effect on the hemodynamics in patients with congestive heart failure or cardiogenic shock.

Adult↗