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Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which...
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Related Experiment Video

Updated: Jan 30, 2026

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Endothelial Dysfunction in Patients With Erectile Dysfunction: A Double-Blind, Randomized-Control Trial Using

Smita Pattanaik1, Pawan Kaundal2, Ravimohan S Mavuduru2

  • 1Department of Pharmacology, Postgraduate Institute of Medical Education and Research, Chandigarh, India; Department of Urology, Postgraduate Institute of Medical Education and Research, Chandigarh, India.

Sexual Medicine
|January 15, 2019
PubMed
Summary

Low-dose tadalafil did not significantly improve erectile function or endothelial dysfunction compared to placebo in this trial. Further research is needed to understand the placebo effect and FMD utility in young patients.

Keywords:
Endothelial DysfunctionErectile DysfunctionFlow-Mediated Dilation of Brachial Artery (FMD)Tadalafil

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Area of Science:

  • Cardiovascular Medicine
  • Urology
  • Clinical Trials

Background:

  • Endothelial dysfunction (EnD) is a significant factor in erectile dysfunction (ED).
  • Tadalafil, a PDE5 inhibitor, is used to treat ED, but its effect on EnD requires further investigation.
  • Assessing EnD through flow-mediated dilation (FMD) provides a measurable outcome.

Purpose of the Study:

  • To evaluate the efficacy of tadalafil in improving endothelial function in patients with erectile dysfunction.
  • To compare the effects of tadalafil versus placebo on erectile function and endothelial function.
  • To conduct a placebo-controlled randomized trial to assess tadalafil's impact on EnD.

Main Methods:

  • A double-blind, randomized-control trial was conducted with 89 patients diagnosed with ED and EnD (FMD < 15%).
  • Participants received either placebo or low-dose tadalafil for 4 weeks.
  • Erectile function was assessed using the International Index of Erectile Function (IIEF-5), and endothelial function by brachial artery flow-mediated dilation (FMD).
  • Assessments were performed at baseline and after 4 weeks by blinded observers.

Main Results:

  • Both tadalafil and placebo groups showed significant improvements in IIEF-5 scores and FMD% from baseline.
  • No statistically significant differences were observed between the tadalafil and placebo groups in the mean change of IIEF scores or FMD%.
  • Adverse events were significantly more frequent in the tadalafil group compared to the placebo group (14 vs. 5).

Conclusions:

  • Low-dose tadalafil demonstrated similar effects to placebo on both erectile function (IIEF) and endothelial function (FMD).
  • The study highlights a notable placebo effect in this patient population.
  • Further research is recommended to explore the utility of FMD% in younger patients and to better understand the placebo response in ED treatment.