Related Experiment Video
Updated: Jan 20, 2026
Flyback Converter; Setting up the HiReL Power Pole Board
Published on: April 30, 2023
Covert postpartum urinary retention
Objectives:
This study was conducted to determine the frequency of increased postvoiding residual volumes (PVRV) 3 days after delivery and to examine the associated risk factors.
Background:
Increased PVRV ‒ covert postpartum urinary retention, is an asymptomatic condition with possible long-term adverse effects. While early diagnosis and appropriate management can avoid long‑term complications, screening is not routinely performed. By identifying risk factors, we could define the group of patients suitable for screening.
Material And Methods:
This was a prospective observational study carried out over a 3-month period at the university teaching hospital in Bratislava, Slovakia. All participants underwent ultrasound determination of PVRV while 80 ml and more on day 3 was considered pathological.
Results:
A total of 429 women were included in the study. The prevalence of covert post-partum urinary retention was 9.2 %. Assisted vaginal delivery (ventouse, forceps) and episiotomy were risk factors for post-partum urinary retention (18.7 % vs 6.1 %; p = 0.0053; 52.1 % vs 35.7 %; p = 0.0483; respectively).
Conclusion:
Our observations confirmed the existence of PVRV of 80 ml and more on day 3 in almost 10% of women who had delivered at our clinic. The results of our study prove that instrumental delivery represents a considerable obstetrical-pediatric risk factor for PVRV. Our data support the need of adopting a risk-factor-based approach to PVRV screening as part of postpartum bladder care (Tab. 2, Fig. 1, Ref. 12).
Related Concept Videos
Flyback Converter
A flyback converter is a buck-boost converter, which can both buck and boost. It has electrical isolation between the input and the output using a coupled inductor or a "flyback transformer." This coupled inductor enables a turns ratio that provides both voltage step-up and step-down capability, like in a regular transformer but with energy storage using the air-gap of the coupled inductor.
DC/DC Boost Converter
Boost converters provide a versatile solution to stepping up DC voltages in many applications where a DC voltage needs to be increased without the need to convert it to AC, using a transformer, and then rectifying the transformer output. Boost converters are step-up converters that use an inductor as an energy storage device that supports the output with additional energy in addition to the DC input...
DC/DC Buck Converter
While it is simple to step up or down AC voltages and currents using transformers, stepping up or down DC voltages and currents in an efficient and regulated manner requires switching power converters. The DC/DC buck converter chops the input DC voltage using a series input switch, and the chopped voltage is filtered through the L-C low-pass filter to extract the average output voltage. The diode...
05:25Ultrasonography of the Adult Male Urinary Tract for Urinary Functional Testing
07:30Using Chronic Social Stress to Model Postpartum Depression in Lactating Rodents
07:38Induction of Nephrotic Syndrome in Mice by Retrobulbar Injection of Doxorubicin and Prevention of Volume Retention by Sustained Release Aprotinin
