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Biomedical subjects

Z Zuckerman

Publications and source records attributed to Z Zuckerman.

9 recordsLinked to original sources
PubMed1986

Actual effective CO2 laser power on tissue in endoscopic surgery.

To elucidate the cause of power reduction in endoscopic carbon dioxide (CO2) laser surgery and to define the actual effective power on tissue of a beam delivered through different endoscopes, we designed an experimental model. In passing a CO2 laser beam through a CO2 gas-pressurized chamber, no significant power loss was noted. A correlation between the internal diameter of an endoscope and the power output became evident. Effective power of 92%, 85%, and 48% of the potential 100% was measured when a beam was delivered through single- and double-puncture laparoscopes and a hysteroscope, respectively. These figures are relevant in predicting CO2 laser effect used endoscopically.

Atmospheric Pressure↗
PubMed1986

Human spermatozoa penetration to zona-free hamster ova and the volume of sperm cells.

Thirty-five infertile men were divided into two groups: those with normal spermograms (15 cases) and those with oligospermia (20 cases). Each semen sample was examined by its penetration into zona-free hamster ova and by an improved Coulter counter apparatus for measuring the volume of spermatozoal head. Both groups were further divided into two subgroups: those with normal (above 15%) and those with abnormal penetration assay (0-10%). The relationship between sperm modal size and sperm cell penetration into hamster ova in both groups--the oligospermic and the normospermic--was calculated and was found to be nonsignificant (correlation index: -0.154). It appears that the inability of some human sperm cells to penetrate the zona-free hamster ova cannot be attributed to the spermatozoal size.

Animals↗
PubMed1984

Hysteroscope for CO2 laser application.

Endoscopic laser surgery is becoming more common with the development of suitable instruments. A hysteroscope designed for use with a Sharplan CO2 laser is described in detail. The method of application, results of preliminary experience, and possible indications are discussed.

Endoscopes↗
PubMed1984

New instrumentation and technique for laparoscopic carbon dioxide laser operations: a preliminary report.

Laparoscopic surgery, the accepted procedure for several indications, still has some limitations, mainly due to the risk of uncontrollable bleeding and damage to the surrounding tissues that may result from the procedure. With the advent of the surgical carbon dioxide laser apparatus and its advantage in producing a bloodless incision, the authors have modified their approach toward laparoscopic surgery. A variety of special straight laser channels for introduction into the abdominal cavity have been developed; use of these channels requires special care to protect surrounding tissues from damage during the procedure. A Sharplan laser delivery system comprising an articulated arm was used, and the operative area visualized and controlled by single- and double-puncture laparoscope systems. The techniques were first applied in rabbits and, after several improvements, used in humans for various indications. The laser laparoscope can be particularly useful in the treatment of endometriosis and lysis of pelvic adhesions.

Carbon Dioxide↗
PubMed1977

Effect of thyrotrophin-releasing hormone on serum prolactin levels in men with azoospermia.

Infertile men with azoospermia and low testosterone levels because of Klinefelter's or Sertoli cell-only syndrome responded to a single injection of TRH by an increase in serum prolactin levels. The degree of this response was not as great as in fertile men with normospermia and normal testosterone levels, although initial prolactin levels had been similar in both groups. The results demonstrate a link between testosterone and prolactin levels in fertile and infertile men.

Humans↗
PubMedDate not supplied

Ultrasound-guided testicular sperm aspiration in azoospermic patients: a new sperm retrieval method for intracytoplasmic sperm injection.

PURPOSE: We investigated the technique of ultrasound-guided testicular sperm aspiration (USTSA) and compared it with "blind" testicular sperm aspiration (TSA) in patients with nonobstructive azoospermia. METHODS: Thirty-nine consecutive azoospermic men underwent TSA, 16 under sonographic guidance (USTSA group) and 23 with no imaging guidance (TSA group). Clinical and hormonal evaluation and sonography of the scrotum and testes were performed 1-2 days before the procedure. The aspiration was done using short-term general anesthesia. Follow-up consisted of sonographic reexamination of the scrotum and testes immediately and 1 month after the procedure. RESULTS: Intraoperative sonography with power Doppler imaging enabled good visualization of the testicular parenchyma, easy sampling, and avoidance of prominent vessels. Sufficient material was retrieved in 15 USTSA patients (94%) and 19 TSA patients (83%). No patients needed more than 4 hours' ambulatory hospitalization after the procedure. In the remaining 5 patients, aspiration failed to yield sperm, so open biopsy was performed. In those patients, postaspiration surgical exploration revealed subtunical bleeding in 3 patients after TSA but none after USTSA. Late minor complications occurred in 2 patients (13%) in the USTSA group and 7 (30%) in the TSA group. No difference was found between the 2 groups in pregnancy rate in the patients' female partners. CONCLUSIONS: USTSA is a safe and accurate method for sperm retrieval in azoospermic patients.

Adult↗