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Urodynamic Studies: Uroflowmetry

Uroflowmetry is a non-invasive urodynamic test designed to measure various aspects of urination, including volume, flow rate, and the time to void. This test is crucial for diagnosing and assessing conditions such as bladder outlet obstruction, bladder dysfunction, incomplete bladder emptying, incontinence, and urinary tract blockages caused by benign prostatic hyperplasia (BPH) and urethral strictures.Pre-Test Instructions:Before a uroflowmetry test, patients are typically advised to drink...
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Blood Flow01:29

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Updated: May 14, 2026

Spatial Temporal Analysis of Fieldwise Flow in Microvasculature
09:39

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Published on: November 18, 2019

"Small-for-flow" syndrome: shifting the "size" paradigm.

J M Asencio1, J Vaquero, L Olmedilla

  • 1Department of General Surgery III and Liver Trasplant Unit, Hospital General Universitario Gregorio Marañón, c/Doctor Esquerdo 46, Madrid 28007, Spain. jmasencio@gmail.com

Medical Hypotheses
|February 23, 2013
PubMed
Summary

The "small-for-size" syndrome, a cause of liver failure after surgery or transplant, is better predicted by liver blood flow than just liver size. Focusing on "small-for-flow" can improve patient outcomes.

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Area of Science:

  • Hepatology
  • Surgical Oncology
  • Transplantation Medicine

Background:

  • Small-for-size syndrome and post-hepatectomy liver failure are critical complications following liver surgery and transplantation.
  • Current prediction relies on liver mass-to-body weight ratio, which is often inaccurate.
  • This inaccuracy leads to high mortality and limits donor liver utilization and surgical indications.

Purpose of the Study:

  • To challenge the traditional "small-for-size" paradigm by proposing a new hypothesis.
  • To investigate the role of hepatic hemodynamics in the development of liver failure after liver mass reduction.
  • To suggest a shift towards a "small-for-flow" approach for improved clinical management.

Main Methods:

  • Review of recent clinical and experimental reports on liver hemodynamics.
  • Analysis of the relationship between portal hyperperfusion and small-for-size syndrome.
  • Discussion of the implications of measuring hepatic blood flow and pressure.

Main Results:

  • Portal hyperperfusion is identified as a critical factor in small-for-size syndrome development.
  • Manipulating hepatic vascular inflow can prevent syndrome development even with low liver-to-body weight ratios.
  • Current size-based thresholds are insufficient for predicting liver failure risk.

Conclusions:

  • Hepatic hemodynamic parameters, not just liver mass, are crucial for predicting post-hepatectomy liver failure.
  • Measuring and manipulating hepatic blood flow and pressure can optimize donor liver use and surgical safety.
  • Adopting a "small-for-flow" approach will enhance patient outcomes and expand surgical possibilities.