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Effects of Low Intensity Therapeutic Ultrasound on Endothelial Function

NCT02872922 · Status: COMPLETED · Phase: NA · Type: INTERVENTIONAL · Enrollment: 22

Last updated 2017-09-21

No results posted yet for this study

Summary

Endothelium is a cell layer that interposes blood and smooth muscle of vessels. This biological sensor reacts to physical and chemical stimuli by synthesis and/or liberation of regulatory substances like nitric oxide (NO), which acts on vascular tone, growth of muscle cells and platelet aggregation and leukocyte. Clinically, endothelial function measured by technique flow-mediated dilation (FMD) is a strong predictor of cardiovascular events and all-cause mortality. Previo study demonstrated that continuous and pulsed therapeutic 1-MHz ultrasound waveforms improved endothelial function in health volunteers and this vasodilation persisted for 20 min, which provided them with anti-inflammatory vascular effects. In subjects with type 2 diabetes (DM2) the chronical hyperglycemia and dyslipidemia reduce NO bioavailability causing endothelial dysfunction. Low intensity therapeutic ultrasound is an electrotherapeutic instrument employed in musculoskeletal injuries that promotes endothelium-dependent vasodilation, and its mechanism of action has not been studied on DM2. The aim of our study is evaluate endothelial function of patients with DM2 after different waveforms (placebo, continuous and pulsed) of therapeutic ultrasound. Therapeutic ultrasound is a electrotherapeutic instrument that can changes arterial endothelial function of subjects with DM2 because of NO bioavailability increasing, which implies anti-inflammatory and vasodilatory beneficial alterations for diabetic patients.

Conditions

  • Diabetes Mellitus, Type 2

Interventions

OTHER

Low intensity therapeutic ultrasound

The ultrasound equipment (Sonopulse III, 1 MHz, IBRAMED, Brazil) was calibrated with the radiation force method. In study, the head of the transducer will be positioned and applied for 5 min over the brachial artery at the same point that will be evaluated the endothelium function (Cruz et al., 2016). Continuous waveforms of ultrasound therapy (CWUT) are applied in the stationary mode for 5 minutes at a spatial averaged temporal intensity (SATA) of 0.4 W/cm2 using a transducer 1-MHz. A pulsed waveform of ultrasound therapy (PWUT) are applied (5 minutes) with a 20% duty cycle (2 ms on, 8 ms off), which represents a constant intensity of 0.08 W/cm2 SATA. In the placebo intervention, all of the procedures above are repeated, but with the ultrasound equipment powered off (Cruz et al., 2016).

Sponsors & Collaborators

  • Universidade Federal de Santa Maria

    lead OTHER

Principal Investigators

  • Luis U Signori, PhD · Universidade Federal de Santa Maria

Study Design

Allocation
RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
TRIPLE
Model
CROSSOVER

Eligibility

Min Age
25 Years
Max Age
65 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2016-12-10
Primary Completion
2017-09-20
Completion
2017-09-20

Countries

  • Brazil

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT02872922 on ClinicalTrials.gov