Blar i forfatter "Kiserud, Torvid"

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    • Fetal size in the second trimester is associated with the duration of pregnancy, small fetuses having longer pregnancies 

      Wilsgaard, Tom; Johnsen, Synnøve L.; Rasmussen, Svein; Hanson, Mark A.; Godfrey, Keith M.; Kiserud, Torvid (Journal article; Tidsskriftartikkel; Peer reviewed, 2008-07-16)
      Background: Conventionally, the pregnancy duration is accepted to be 280–282 days. Fetuses determined by ultrasound biometry to be small in early pregnancy, have an increased risk of premature birth. We speculate that the higher rate of preterm delivery in such small fetuses represents a pathological outcome not applicable to physiological pregnancies. Here we test the hypothesis that in ...

    • Fetal Superior Vena Cava Blood Flow and Its Fraction of Cardiac Output: A Longitudinal Ultrasound Study in the Second Half of Pregnancy 

      Stefopoulou, Maria; Johnson, Jonas; Herling, Lotta; Lindgren, Peter; Kiserud, Torvid; Acharya, Ganesh (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-07-06)
      <i>Introduction</i>: In the fetus, a large proportion of the superior vena cava blood flow (QSVC) comes from the brain. To provide the possibility of using this blood flow as a representation of fetal brain circulation, we aimed to determine the fetal QSVC and its fraction of cardiac output during the second half of physiological pregnancies.<br><br> <i>Materials and Methods</i>: This was a ...

    • Incidence of gynecological fistula and its surgical treatment: A national registry-based study 

      Børseth, Katrine Trovik Flaatten; Acharya, Ganesh; Kiserud, Torvid; Trovik, Jone (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-03-19)
      <i>Introduction</i> - Gynecological fistula (affecting female genital organs) leads to involuntary loss of urine or feces. In industrialized societies, fistulas occur mostly as complications of surgery, radiation therapy or inflammatory bowel disease. We sought to determine the incidence of gynecological fistula and type of surgical treatment provided in Norway.<p><p> <i>Material and methods</i> ...

    • ISUOG Practice Guidelines (updated): use of Doppler velocimetry in obstetrics 

      Bhide, Amarnath; Acharya, Ganesh; Baschat, Ahmet Alexander; Bilardo, Caterina Maddalena; Brezinka, Christoph; Cafici, Daniel; Ebbing, Cathrine; Hernandez-Andrade, Edgar A.; Kalache, Karim; Kingdom, John; Kiserud, Torvid; Surendran, Sailesh Kumar; Lee, Wesley; Lees, Christoph; Leung, Kwok Yin; Malinger, Gustavo; Mari, Giancarlo; Prefumo, Federico; Sepulveda, Waldo; Trudinger, Brian (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-07-19)
      The International Society of Ultrasound in Obstetrics and Gynecology (ISUOG) is a scientific organization that encourages sound clinical practice, teaching and research related to diagnostic imaging in women's healthcare. The ISUOG Clinical Standards Committee (CSC) has a remit to develop Practice Guidelines and Consensus Statements as educational recommendations that provide healthcare practitioners ...

    • Reference ranges of fetal superior vena cava blood flow velocities and pulsatility index in the second half of pregnancy: a longitudinal study 

      Stefopoulou, Maria; Herling, Lotta; Johnson, Jonas; Lindgren, Peter; Kiserud, Torvid; Acharya, Ganesh (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-23)
      Background - Fetal superior vena cava (SVC) is essentially the single vessel returning blood from the upper body to the heart. With approximately 80-85% of SVC blood flow representing cerebral venous return, its interrogation may provide clinically relevant information about fetal brain circulation. However, normal reference values for fetal SVC Doppler velocities and pulsatility index are lacking. ...

    • Sex differences in umbilical artery Doppler indices: A longitudinal study 

      Widnes, Christian; Flo, Kari; Wilsgaard, Tom; Kiserud, Torvid; Acharya, Ganesh (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-04-18)
      <p><i>Background</i>: Sexual dimorphism in placental size and function has been described. Whether this influences the clinically important umbilical artery (UA) waveform remains controversial, although a few cross-sectional studies have shown sex differences in UA pulsatility index (PI). Therefore, we tested whether fetal sex influences the UA Doppler indices during the entire second half of pregnancy ...

    • Sex-specific reference ranges of cerebroplacental and umbilicocerebral ratios: A longitudinal study 

      Acharya, Ganesh; Ebbing, Cathrine; Karlsen, Henriette Odland; Kiserud, Torvid; Rasmussen, Svein (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-09-10)
      <p><i>Objectives - </i>The ratio of middle cerebral artery (MCA) pulsatility index (PI) to umbilical artery (UA) PI, i.e. cerebro‐placental ratio (CPR), has been suggested as a measure of fetal “brain sparing” phenomenon reflecting redistribution of fetal cardiac output as a response to placental insufficiency. Observational studies have shown that low CPR values predict increased risk of adverse ...

    • Ultrasound assessment of maternal endothelial function : a tool for epidemiology 

      Kiserud, Torvid; Acharya, Ganesh; Lunde, Per (Journal article; Tidsskriftartikkel; Peer reviewed, 2009)

    • Volume blood flow-based indices of fetal brain sparing in the second half of pregnancy: A longitudinal study 

      Stefopoulou, Maria; Johnson, Jonas; Wilsgaard, Tom; Lindgren, Peter; Herling, Lotta; Kiserud, Torvid; Acharya, Ganesh (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-07-07)
      <i>Introduction</i> - Cerebroplacental ratio (CPR) and umbilicocerebral ratio (UCR) are clinically used as a measure of fetal brain sparing. These are calculated as the ratios between the pulsatility indices (PIs) of middle cerebral (MCA) and umbilical (UA) arteries, and are an indirect representation of the balance between cerebral and placental perfusion. Volume blood flow (Q)‐based ratios, ie ...