PubMed Health⌕ Search

Biomedical subjects

D J Rosen

Publications and source records attributed to D J Rosen.

18 recordsLinked to original sources
PubMed1992

Transvaginal ultrasonographic quantitative assessment of accumulated cul-de-sac fluid.

Preoperative quantitative assessment of pelvic fluid is an important diagnostic tool in clinical decision making. In this study, we used high-frequency transvaginal ultrasonography in 10 healthy women to assess both the correlation between various amounts of fluid installed in the cul-de-sac and ultrasonic imaging and to determine whether correct estimation of fluid volume can be reached. No fluid could be ultrasonically detected when the volume was less than 35 to 40 ml. Between 35 and 100 ml there was a clear image of accumulated fluid in the cul-de-sac with good correlation between volume and image, whereas with larger amounts no clear correlation between the amount of fluid introduced and size of fluid area visualized by ultrasonography was possible. Transvaginal ultrasonography may enable quantitative evaluation of certain volumes of pelvic fluid, although amounts less than 35 ml cannot be visualized.

Body Fluids↗
PubMed1992

Repeated external cephalic version at term.

External version was performed three times in a patient at term because of spontaneous reversion to breech presentation. She was then delivered vaginally. Spontaneous reversion to breech presentation can be managed with additional external cephalic version procedures.

Adult↗
PubMed1991

Conservative approach to multiple pregnancy with intrauterine fetal death of one or more fetuses.

One of the less common complications of multiple gestation is intrauterine demise of one or more fetuses. Despite the many case reports in the literature, there are no firm guidelines regarding the management of this problem. We herein report the favorable outcome of the conservative approach we chose for managing four patients; two with twins, one with triplets and one with quadruplets (first report in the literature). Strict follow-up based on frequent physical examinations, ultrasonographic assessment of fetal growth and well being, and coagulation profiles is mandatory. Individualization of delivery dates and mode is recommended.

Adult↗
PubMed1991

Indomethacin therapy and fetal urine production in twins with polyhydramnios.

Indomethacin has been used in twins with polyhydramnios to decrease amniotic fluid volume. Under therapy, a marked reduction of both fetuses' urine production has been demonstrated within 24 hours concomitant with maternal symptomatic relief. Discontinuation of therapy was associated with a rapid increase in fetal urine production. The clinical observation indicates that the benefit of indomethacin in prolonging such pregnancies is most probably the result of relief of polyhydramnios through decreased fetal urine production.

Administration, Oral↗
PubMed1990

Relation of rate of urine production to oxygen tension in small-for-gestational-age fetuses.

Hourly fetal urine production rate was determined by real-time ultrasonography immediately before cordocentesis for blood gas analysis in 27 small-for-gestational-age fetuses at 20 to 37 weeks' gestation; in 14 cases there was associated oligohydramnios. The values were compared with those of 101 appropriate-for-gestational-age fetuses. The hourly fetal urine production rate was significantly lower in the small-for-gestational-age fetuses than in the appropriate-for-gestational-age fetuses. Furthermore, there was a significant correlation between the degree of decrease in urine production and both the degree of fetal hypoxemia and the degree of fetal smallness. There was no significant difference between the oligohydramnios and nonoligohydramnios groups in either the degree of decrease in urine production or the degree of fetal hypoxemia.

Amniotic Fluid↗
PubMed1990

Fetal urine production in normal twins and in twins with acute polyhydramnios.

In twelve twin pregnancies with normal amniotic fluid volume, the urine output of each twin was lower than in fetuses from singleton pregnancies, and the combined urine output of both twins was between the 50th and 95th centile for singletons. In three twin pregnancies at 21-24 weeks of gestation with acute polyhydramnios, presumed to be due to the twin-twin transfusion syndrome, the urine output of the smaller fetus was zero and that of the larger was above the 95th centile for normal singleton pregnancies. These three pregnancies were managed by repeated amniocenteses and rapid drainage of large volumes of amniotic fluid. With advancing gestation, there was a tendency for normalization of urine output in the twins.

Amniocentesis↗
PubMed1989

Classical discrimination conditioning of the rabbit's eyelid response using pontine stimulation as a conditioned stimulus.

Classical discrimination conditioning of the nictitating membrane/eyelid response was performed on seven rabbits using stimulation of the pontine nuclei or middle cerebellar peduncle as the conditioned stimulus (CS) and an air puff as the unconditioned stimulus (US). The rabbits learned to discriminate between a CS paired with a US and delivered to one pontine nucleus (the CS+) and a CS presented alone and delivered to the contralateral pontine nucleus (the CS-). Subsequent reversal of the discrimination was also achieved when the CS+ and CS- stimulation sites were interchanged. The results are interpreted as support for the idea that essential plasticity for classical eyelid conditioning occurs efferent to the pontine nuclei, possibly in regions of the cerebellum.

Animals↗
PubMed1989

The use of PGE2 for induction of labor in parturients with a previous cesarean section scar.

Controversy still dominates the discussion of the correct method for delivering patients with a previous cesarean section (C/S) scar. Although many have abandoned the slogan of "once a cesarean, always a cesarean", repeat cesareans are still the rule in many institutions. We have abandoned this dogma, and are now advancing to new ideas and are promoting a new protocol. Nineteen post-one cesarean section patients were induced on various indications by means of PGE2 pessaries. Close surveillance revealed no complications and 16 were delivered vaginally. All neonates had good Apgar scores, and all scars were found to be intact upon examination. We recommend cautious use of prostaglandins for selected post-cesarean patients.

Cesarean Section↗
PubMed1988

An unusually aggressive verrucose carcinoma of the uterine cervix.

An unusual case of Verrucose Carcinoma of the uterine cervix is described. The tumor characteristics, as well as its aggressively malignant potential nature are presented. The unique response to irradiation therapy is discussed, hence the great difficulty in treating the tumor and the importance of early diagnosis to achieve a good prognosis. The literature regarding this unique tumor is reviewed.

Carcinoma, Papillary↗
PubMed1987

Initial localization of the acoustic conditioned stimulus projection system to the cerebellum essential for classical eyelid conditioning.

Previous experiments have demonstrated a sufficient and necessary involvement of mossy fibers in projecting conditioned stimulus information to the cerebellum during classical eyelid conditioning in rabbits. Presented here are electrophysiological, anatomical, and lesion data that suggest that cells within the lateral pontine nuclear region may be essentially involved in projecting information concerning the occurrence of acoustic conditioned stimuli to the cerebellum during classical conditioning.

Acoustic Stimulation↗
PubMed1986

Rapid transfer of training occurs when direct mossy fiber stimulation is used as a conditioned stimulus for classical eyelid conditioning.

Fifteen rabbits were classically conditioned using stimulation of the right pontine nuclei as a conditioned stimulus and a corneal airpuff as an unconditioned stimulus. After conditioning criterion was reached, the stimulation conditioned stimulus was transferred to the left pontine nuclei and the rate of conditioned response acquisition observed. Our results indicate that when electrodes were placed symmetrically in the right and left pontine nuclei, extremely rapid transfer of training occurred. Together with previous data, the present data supply further indirect evidence that the site of neural plasticity which underlies acquisition and retention of classically conditioned skeletal muscle responses is located efferent to the pontine nuclei, namely in the cerebellum.

Animals↗
PubMed1986

Classical conditioning of the rabbit eyelid response with a mossy-fiber stimulation CS: I. Pontine nuclei and middle cerebellar peduncle stimulation.

The nictitating membrane/eyelid responses of 18 rabbits were classically conditioned using cerebellar mossy-fiber stimulation as a conditioned stimulus (CS) and air puff as an unconditioned stimulus (US). The dorsolateral, lateral, and medial pontine nuclei and the middle cerebellar peduncle were effective stimulation-CS sites for training. In one group of rabbits, robust conditioned eyelid responses were produced with paired trials and subsequently extinguished with CS-alone and explicitly unpaired presentation of the CS and US. In a second group of rabbits, no conditioned responses were evident for 4 days of unpaired CS and US presentations. Conditioned responses did develop, however, after paired training was begun. Lesions of the interpositus nucleus of the cerebellum completely abolished the conditioned responses of a third group of rabbits overtrained with the mossy-fiber CS and air-puff US. These results support previous studies which have demonstrated that the cerebellum is critically involved in acquisition and retention of simple learned responses. In addition, the present results support previous theories of cerebellar function which have proposed that mossy fibers supply critical "learning" input to the cerebellum for acquisition and retention of motor skills.

Animals↗