The current status of in vivo screening of synthetic implant materials for blood compatibility.
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Animals↗
Biomedical subjects
A Furuse
Publications and source records attributed to A Furuse.
Antithrombogenic surfaces, classification and in vivo evaluation.
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Acrylic Resins↗
Aortoatrioplasty with double valve replacement for infective endocarditis.
This is a report of a patient with active infective endocarditis involving both aortic and mitral valve annuli. A new surgical technique which was necessary to replace the infected valves is described in detail. This may be regarded as an application of the Manouguian technique to infective endocarditis.
Adult↗
Clinical experience of Hall-Kaster valve. Operative results and hemodynamic studies.
The Hall-Kaster pivotal disc prosthetic valve (HK valve) was introduced in 1977. Since October 1979, we have used the HK valve in 137 patients for valve replacement. The over-all operative mortality was 5.1%. During 36 months follow-up, there were 3 late deaths due to congestive heart failure, but no valve related death, no mechanical failure and no thromboembolic episode have been encountered. Intraoperative hemodynamic studies revealed its valvular function to be excellent. The mean pressure gradients across the prosthesis were 11.0 +/- 1.6 and 4.2 +/- 2.0 mmHg in aortic and mitral position, respectively. The mean calculated valve areas were 1.7 +/- 0.6 and 3.7 +/- 1.2 cm2 in aortic and mitral position, respectively. Thus, the Hall-Kaster prosthetic valve was found to be an efficient and favorable prosthetic heart valve for aortic and mitral valve replacement.
Adolescent↗
[Target heart rate for exercise echocardiography].
The exercise stress test with a semi-supine position bicycle ergometer was evaluated in 10 normal subjects and five cardiac patients to define the appropriate target heart rate for exercise echocardiography. The normal healthy subjects were aged between 24 and 30 years, while the five patients with artificial aortic valves were aged between 13 and 54 years. The workload was continuously increased from 0 W to the maximum achieved workload at 20 W/min for normal subjects and 10 W/min for patients. Echocardiography was recorded every minute during the test procedure. End-diastolic and end-systolic dimensions were measured and ejection fraction was calculated. The ejection fraction at heart rates 50, 60, 70 and 80% of predicted maximum heart rate and at maximum workload were compared. Heart rates at the maximum workload for normal subjects were 76 to 94% (86.3 +/- 6.3%) of the maximum heart rate predicted from the age of the subjects and 70 to 102% (84.0 +/- 12.6%) for the patients. The largest election fraction values during exercise stress were obtained at 70% of the maximum predicted heart rate in normal subjects, and at 60% in the patients. The target heart rate for exercise echocardiography is 70% of the maximum calculated heart rate.
Adolescent↗
Thoracoscopic surgery for lung cancer complicated by emphysema in elderly patients. Report of three cases.
We have experienced three elderly cases who underwent thoracoscopic surgery for lung cancer complicated by emphysema. Cases 1, 2 and 3, respectively aged 76, 78 and 80 years, had required the oxygen therapy preoperatively. Allowing for poor pulmonary reserve, a thoracoscopic partial pulmonary resection for lung cancer combined with Nd-YAG laser pneumoplasty for emphysema was designed. The respective values of forced expiratory volume in one second (FEV 1.0) for cases 1 and 2 increased from 470 and 820 to 860 and 1620 ml. Reductions in residual volumes (RV) for cases 1, 2 and 3 were from 2770, 4940 and 5230 to 2370, 4500 and 3250 ml. The degrees of respiratory failure in the Hugh-Jones classification for cases 1, 2 and 3 were up-graded from V, IV and IV, respectively, to III, II and II, postoperatively. In conclusion, our thoracoscopic treatment, designed for elderly patients with poor pulmonary reserve, allows improvement of emphysema as well as resection of lung cancer.
Aged↗
New tactile sensor techniques for localization of pulmonary nodules.
We developed a new method for thoracoscopically localizing pulmonary nodules using a tactile sensor. This sensor was originally designed to probe the hardness of an object, which is represented by changes in resonance frequency of the sensor (delta f: Hz). By moving over the lung surface, the sensor probe, introduced through a 10 mm trocar, was able to search for nodules within the pulmonary parenchyma thoracoscopically. When the sensor probe passed just above a nodule, which was harder than the adjacent tissue, a sudden sharp increase in the curve was observed. We have successfully utilized this method in 16 cases since August 1994. A representative case is that of a 68-year-old male who was admitted with an indeterminate nodule, demonstrated preoperatively in the left lung by chest computed tomography, which was localized with this technique and resected under thoracoscopic surgery.
Aged↗