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Biomedical subjects

M Shirai

Publications and source records attributed to M Shirai.

At least 307 records · Page 17Linked to original sources
PubMed1983

[Two cases of renal arteriovenous fistula].

The first case was a congenital renal arteriovenous fistula in a 33-year-old woman and the second case was a secondary renal arteriovenous fistula in a 67-year-old man. Both cases were seen with asymptomatic gross hematuria without any cardiovascular symptoms. In case 1, the arterial stage of right selective renal angiogram demonstrated a cirsoid type arteriovenous fistula in the right kidney; then, partial nephrectomy was performed. Angiogram of case 2 demonstrated arteriovenous fistula in the lower part of the right kidney. In this case arterial embolization was performed. After reviewing the literature, we believe that partial nephrectomy or arterial embolization is the most useful operative procedure to treat almost all cases of the cirsoid type renal A-V malformation. Conservative treatment of arteriovenous fistula has increased during the post 10 years.

Adult↗
PubMed1981

Hemodynamics of erection in man.

Inquiry was made into the theory that closure of the efferent vein from the corpora cavernosa is essential for erection of the human penis. To determine whether the venous closure is indeed a prerequisite to human penile erection, two tests were carried out in men: (1) direct infusion in 133Xe into corpora cavernosa and (2) performance of carvernosography. In each case, penile erection was induced by providing the subject with sexual stimulation. The behavioral changes were studied through the 133Xe clearance curve and the contrast medium, respectively. When the penis remained flaccid, the 133Xe clearance curve followed a gentle path and the contrast medium could be noted within the penis for a relatively long period. However, on erection with sexual stimulation, the 133Xe clearance curve fell rapidly instead of following the gentle course expected in the case of venous closure. Also, the contrast medium quickly flowed out of the corpora cavernosa. The human penis therefore can well erect without closure of the efferent vein from the corpora cavernosa.

Hemodynamics↗
PubMed1981

[A simple method for enhancing interatrial right-to-left shunt in the diagnosis of small atrial septal defect using contrast echocardiography (author's transl)].

Commonly used contrast echocardiography is often inadequate to detect a small right-to-left (R--L) shunt in minimum atrial septal defect (ASD). We found that the diagnostic accuracy in ASD could be significantly improved by simply employing a Valsalva maneuver immediately followed by a Müller maneuver to enhance the R--L shunt. This procedure enabled contrast echo to be more clearly detected in both the left atrium and left ventricle, compared with conventional contrast echocardiography. The new technique was successful in diagnosing ASD in 5 patients with Qp/Qs ratio less than 2 determined by right heart cardiac catheterization. In conclusion, the diagnosis of a small ASD is greatly improved by simply employing this new procedure of a Valsalva-Müller maneuver during contrast echocardiography.

Adult↗