Influence of Hypocaloric Diet on Urinary Lithogenic Factors of Obese Patients With Kidney Stones

September 28, 2021 updated by: University of Sao Paulo General Hospital
The objective of this study is to evaluate the influence of low-calorie diet on serum and urinary metabolic parameters of obese adults with urinary calculi and lithogenic metabolic abnormalities.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

Objective: to evaluate the influence of low-calorie diet on serum and urinary metabolic parameters of obese adults with urinary calculi and lithogenic metabolic abnormalities.

Method: prospective study of 50 patients, aged over 18 years, with a body mass index above 30 kg/m2, urinary calculi and lithogenic metabolic abnormalities. Will be excluded from the study patients with psychiatric diagnoses other than depression, patients with inability to attend to clinical follow-up, patients with nephrocalcinosis, patients with urinary tract infection, patients with cystinuria and patients subjected to previous surgeries to treat obesity. Each patient will be evaluated monthly on the same day by urologist and nutritionist. On the first evaluation, will be done anamnesis, anthropometric measurements of weight, height, waist, bioimpedance and requested total serum calcium, phosphate, sodium, potassium, urea, creatinine, uric acid, and PTH, pH venous blood, urine tests type I, culture of urine and urine tests of calcium, oxalate, phosphate, sodium, potassium, citrate, magnesium, creatinine, uric acid, cystine and computed tomography for evaluation of urinary calculus. In the second evaluation, 30 days after, anthropometric measures will be repeated, bioimpedance and nutritional assessment will be made with recommendation of daily ingestion of 2500 ml of water and low-calorie diet of 16 Kcal/kg bw/day and requested total serum calcium, phosphate, sodium, potassium, urea, creatinine, uric acid, and PTH, pH venous blood, urine tests type I, culture of urine and urine tests of calcium, oxalate, phosphate, sodium, potassium, citrate, magnesium, creatinine, uric acid, cystine. Patients will be monitored monthly for 3 months with anthropometric measurements, bioimpedance and strengthening of nutritional recommendations. By the end of the third month, patients will be submitted to two series of serum and urine tests as before the diet. The results of serum and urine tests from the beginning of dietary treatment will be compared to those of the end of the treatment with Student T test. P<0.05 are considered significant.

Study Type

Interventional

Enrollment (Actual)

50

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Brazil
      • Sao Paulo, Brazil
        • University of Sao Paulo General Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years to 60 years (Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • body mass index above 30 kg/m2 and urinary calculi on tomography and lithogenic metabolic abnormalities.

Exclusion Criteria:

  • psychiatric diagnoses other than depression
  • inability to attend to clinical follow-up
  • nephrocalcinosis
  • urinary tract infection
  • cystinuria
  • previous surgeries to treat obesity

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Obese with kidney stones
Hypocaloric diet for 3 months
Behavioral: Hypocaloric diet
recommendation of daily ingestion of 2500 ml of water and low-calorie diet of 16 Kcal/kg bw/day

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Urinary lithogenic factors variation
Time Frame: 3 months
serum and 24h urine test as before the diet.
3 months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

University of Sao Paulo General Hospital

Collaborators

Fundação de Amparo à Pesquisa do Estado de São Paulo

Investigators

  • Principal Investigator: Alexandre Danilovic, MD, University of Sao Paulo General Hospital

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

February 1, 2016

Primary Completion (Actual)

May 1, 2018

Study Completion (Actual)

May 1, 2018

Study Registration Dates

First Submitted

February 15, 2016

First Submitted That Met QC Criteria

February 19, 2016

First Posted (Estimate)

February 24, 2016

Study Record Updates

Last Update Posted (Actual)

October 6, 2021

Last Update Submitted That Met QC Criteria

September 28, 2021

Last Verified

October 1, 2016

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • FAPESP 2015/04998-1

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

IPD Plan Description

Condensed data will be available for consultation

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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