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Biomedical subjects

L J Dierker

Publications and source records attributed to L J Dierker.

31 records · Page 2Linked to original sources
PubMed1982

Active and quiet periods in the preterm and term fetus.

Heart rate variability and fetal movement were used to classify active and quiet fetal periods. Fetuses at 28 to 30 weeks and at 38 to 40 weeks' gestation were compared. A period of fetal movement with increased variability of heart beat was classified as active and one with the absence of movement and diminished fetal heart beat was classified as quiet. The results demonstrated significant differences both in the number of active-quiet cycles per hour and in the length of the active periods. These findings suggest that analogs of fetal behavioral states may be present before birth and have cyclic patterns, and that the time spent in each fetal period is longer in older fetuses.

Female↗
PubMed1981

A comparison between maternal, tocodynamometric, and real-time ultrasonographic assessments of fetal movement.

Fetal movements were simultaneously studied with maternal perception, tocodynamometry, and real-time ultrasonography. A comparison between these three modalities demonstrated good agreement. The percentage of agreement improved with increasing duration of fetal movements. For fetal movements lasting longer than 3 seconds, the agreement between ultrasonography and tocodynamometry was 95.6%. These findings suggest that tocodynamometry is a sensitive method for studying fetal movements.

Female↗
PubMed1980

Regular and irregular human fetal respiratory movement.

Fetal respiratory movements (FRM) were studied using abdominal strain gauges (tocodynamometers). The patterns of the FRM were evaluated during both active and quiet fetal time periods, which were determined by the fetal heart rate (FHR) and fetal body movement (FM). The FRM were classified into Regular and Irregular patterns based on neonatal respiratory criteria for sleep-state studies in the term infant. Evaluation of the breath-to-breath intervals (BBI) showed statistically significant respiratory differences during active and quiet fetal time periods. Irregular fetal respiratory movement patterns were noted during fetal active periods. It would appear that the correlation of regular fetal respiratory movement with fetal quiet periods in the term fetus adds additional evidence that a quiet sleep state may exist in the term fetus.

Female↗
PubMed1980

Treatment of postpartum uterine atony with prostaglandin E2 vaginal suppositories.

When severe postpartum hemorrhage secondary to uterine atony is unresponsive to medical management, including oxytocic drugs and/or ergonovine and its derivatives, surgical intervention becomes necessary. This case of postpartum uterine atony, with several features suggesting persistent myometrial dysfunction which did not respond to usual medical measures, responded to treatment with intravaginal prostaglandin E2 (PGE2) suppositories. Prostaglandin E2 vaginal suppositories may be useful in the treatment of persistent postpartum uterine atony.

Adult↗
PubMed1979

Human fetal respiratory movements: a technique for noninvasive monitoring with the use of a tocodynamometer.

A tocodynamometer applied to the maternal abdomen is used for monitoring human fetal respiratory movements (FRM). This provides a recording of fetal chest wall movements from which observations and measurements relating to fetal respiratory physiology may be made. The FRM must be differentiated from materanal vascular and respiratory movements, as well as fetal movements and cardiac pulsations. The technique lends itself to extended periods of observation, since it does not transmit energy to the fetus as in other techniques. The simplicity of the technique, combined with the use of monitoring devices already available in most hospitals, warrants further observation of this method of respiratory movement monitoring in the developing fetus.

Female↗
PubMed1978

Fetal movements associated with fetal heart rate accelerations and decelerations.

In normal pregnant women, the relationship between the FHR and fetal movements (FM) was evaluated during 1,541 consecutive observed FM of at least 1 second's duration. Two observed FHR changes were: (1) accelerations and (2) accelerations followed by decelerations. An acceleration in FHR was observed in association with 91.2 per cent of all FM of 1 to 3 seconds' duration and with 99.8 per cent of FM of longer than 3 seconds' duration. FM were associated with an acceleration followed by a deceleration 66.7 per cent of the time. FM lasting longer than 1 second and associated with neither accelerations nor decelerations were seen 1.8 per cent of the time.

Female↗