PubMed Health⌕ Search

Biomedical subjects

E Imamura

Publications and source records attributed to E Imamura.

At least 55 records · Page 3Linked to original sources
PubMed1985

A case of absent right superior vena cava with persistent left superior vena cava: cross-sectional echocardiographic diagnosis.

We report a case of absence of the right superior vena cava. Hitherto, the findings in this condition have only been obtained using invasive methods; this report is the first in which the diagnosis was made by means of echocardiography. The findings include a markedly enlarged coronary sinus draining into the right atrium and a specific finding of contrast echocardiography in which contrast material injected into the right antecubital vein can be seen in the enlarged coronary sinus. The contrast echo flows into the right atrium from the coronary sinus only. The size of the coronary sinus was far beyond the range (91 +/- 38 mm2/m2) in patients with persistent left superior vena cava with the presence of the right superior vena cava.

Adolescent↗
PubMed1985

Surgical treatment for infective endocarditis--decision tree for the treatment and introduction of translocation method.

Persistent fever during active-phase IE is an indication for surgical treatment in the light of the causative organism and the underlying disease. To counter worsening hemodynamics, surgery may be the only feasible way. Surgery is performed when the patient does not respond to vasodilators and he shows an FS of less than 25%. The introduction of translocation provides a solution for the treatment of active IE. Lesions, vegetations more than 5 mm in diameter, periannular abscess, and mycotic aneurysm that could never be overlooked by two-dimensional echocardiography may hasten the early-stage decision of ways to treat IE.

Adult↗
PubMed1985

[Surgical treatment of infective endocarditis--decision tree for the treatment and introduction of translocation method].

Persistent fever during active-phase IE is an indication for surgical treatment in the light of the causative organism and the underlying disease. To counter worsening hemodynamics, surgery may be the only feasible way. Surgery is performed when the patient does not respond to vasodilators and he shows FS of less than 25%. The introduction of translocation provides a solution for the treatment of active IE. Lesions, vegetations more than 5mm in diameter, periannular abscess, and mycotic aneurysm that could never be overlooked by two-dimensional echocardiography may hasten the early stage decision of ways to treat IE.

Adult↗
PubMed1984

Open-position fixation of bioprostheses for more physiological performance. Fluoroscopic observations of leaflet movements in vivo.

A new model of the stent-mounted porcine aortic bioprosthesis was prepared with 0.625% glutaraldehyde while the valve was partially open. A radiopaque marker was attached to the center of the free margin of each leaflet so that the leaflet movements could be observed in an in vivo testing unit by fluoroscopic cinematography. This valve was compared with a porcine xenograft that currently is available commercially. While the heart was beating, the specially prepared leaflets showed some characteristics that contrasted with those of the currently used bioprosthesis. These features included (1) uniformity versus asymmetry of leaflet excursions under low flow conditions, (2) slower and more gradual closing (actual closing time averaging 536 msec versus 81 msec), and (3) more prolonged period of valve opening, the duration of opening averaging 60% versus 49% of the cardiac cycle. These features support the validity of open-position fixation as a means of further improving xenograft durability.

Animals↗
PubMed1983

Effect of temperature on the arrested heart exposed to a 4-hour ischemia during blood potassium cardioplegia. An experimental study.

This study was undertaken to evaluate the optimal myocardial temperature during a 4-hour ischemia induced by blood potassium cardioplegia (PC). Heart-lung preparations with work load circuit were used as experimental model. 24 mongrel dogs were divided into four groups and two myocardial temperatures (moderate hypothermia, deep hypothermia) and two perfusates (PC with blood, PC without blood) were tested. Parameters used to evaluate the myocardial protection include the coronary sinus blood pH of the initial reperfusion and left ventricular stroke work after resuscitation. In blood PC at moderate hypothermia, deleterious acid metabolites were minimally produced as evidenced by the coronary sinus blood pH (7.221 +/- 0.122) at initial reperfusion, and cardiac function was best recovered in this group. Blood PC at moderate hypothermia allows the heart to tolerate 4 h ischemia without an excessively elevated coronary perfusion pressure during cardioplegic infusion.

Animals↗
PubMed1982

An improved de Vega tricuspid annuloplasty.

Constricting the tricuspid annulus to an optimal size and ensuring competency of the suture in situ are essential to the performance of a successful de Vega annuloplasty. An approach to this goal is presented. Important maneuvers include placement of the inside suture just on the ring portion, use of a 33 mm of 35 mm valve obturator to obtain an annulus of the desired size, and ligation of the knots at their roots to prevent potential loosening.

Adult↗