Exercise Therapy to Treat Adults With Abdominal Aortic Aneurysms (AAA:STOP)

This study has been completed.
Sponsor:
Collaborator:
Information provided by (Responsible Party):
Stanford University
ClinicalTrials.gov Identifier:
NCT00349947
First received: July 6, 2006
Last updated: June 5, 2013
Last verified: June 2013
  Purpose

An abdominal aortic aneurysm (AAA) is a weakened and enlarged area in the abdominal aorta, which is a large blood vessel in the abdomen. If an AAA ruptures, it can be life-threatening. Research has shown that sedentary individuals are at increased risk of developing AAAs. This study will evaluate the effectiveness of an exercise program at limiting the growth of small AAAs in older individuals.


Condition Intervention Phase
Aortic Aneurysm, Abdominal
Behavioral: Exercise Program
Phase 1

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Parallel Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: Abdominal Aortic Aneurysms: Simple Treatment or Prevention (AAA: STOP)

Resource links provided by NLM:


Further study details as provided by Stanford University:

Primary Outcome Measures:
  • Growth rate of AAAs [ Time Frame: Measured at Year 3 ] [ Designated as safety issue: No ]

Estimated Enrollment: 2400
Study Start Date: November 2006
Study Completion Date: April 2011
Primary Completion Date: April 2011 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: 1
Participants will take part in an exercise program.
Behavioral: Exercise Program
Participants who live within 15 miles of the Palo Alto VA Hospital will take part in a supervised aerobic exercise program 3 days a week. Participants who live farther than 15 miles from the hospital will receive a detailed exercise plan and will exercise on their own while wearing a heart rate and activity tracking device. They will also attend monthly study visits for review of their progress. All participants assigned to the exercise program will be encouraged to increase their daily exercise. Each day they will wear a pedometer; twice a month they will wear a global positioning system (GPS) and heart rate monitor.
No Intervention: 2
Participants will take part in a usual activity group.

Detailed Description:

AAAs are common among older individuals, and are the 10th leading cause of death for men over the age of 55. A ruptured AAA usually leads to death. Therefore, early detection and treatment are critical. Currently, there are several surgical treatment options available, but there is no proven non-surgical treatment for AAAs. Research has shown that physical inactivity may be linked to the development of AAAs. The purpose of this study is to gather information on AAA risk factors, and to evaluate the effectiveness of an exercise program at preventing the growth of small AAAs in older individuals.

This study will be composed of three individual projects. Project 1 will enroll 1400 individuals with small AAAs. Project 2 will enroll 1000 individuals with unknown aortic size and previously tested exercise capacity. Both groups of participants will attend one study visit, at which time their medical history and physical activity history will be recorded, vital signs will be collected, and blood and urine sample will be given. Questionnaires will be completed to document physical activity levels and AAA risk factors. An abdominal ultrasound will be performed to measure the size of the aorta or AAA. Participants in Project 2 will also take part in a treadmill exercise test, during which heart rate and blood pressure will be recorded, and heart activity will be monitored by an electrocardiogram (ECG).

The third project will last 3 years and will enroll 340 individuals from Project 1. Participants will be randomly assigned to either an exercise program or a usual activity group. An initial screening visit will include medical history review, vital sign measurements, blood collection, questionnaires, an abdominal ultrasound, a positron emission tomography (PET) scan, a computed tomography (CT) scan, and a magnetic resonance imaging (MRI) scan.

Participants in the exercise program will complete an exercise test at the beginning of the study and every 6 months for the duration of the study. Participants who live within 15 miles of the Palo Alto VA Hospital will take part in a supervised aerobic exercise program 3 days a week. Participants who live farther than 15 miles from the hospital will receive a detailed exercise plan and will exercise on their own while wearing a heart rate and activity tracking device. They will also attend monthly study visits for review of their progress. All participants assigned to the exercise program will be encouraged to increase their daily exercise. Each day they will wear a pedometer; twice a month they will wear a global positioning system (GPS) and heart rate monitor. Participants assigned to the usual activity group will wear pedometers each day and will maintain their usual level of physical activity. At yearly study visits, blood will be collected and physical activity levels will be assessed.

All Project 3 participants with AAAs smaller than 4 cm will undergo an ultrasound and blood collection once a year; participants with AAAs 4 cm or larger will undergo the same procedures every 6 months. At the end of 3 years, all participants will attend a final study visit at which time their medical history will be reviewed and blood will be collected. They will also undergo an abdominal ultrasound, and PET, CT, and MRI scans.

  Eligibility

Ages Eligible for Study:   50 Years and older
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No
Criteria

Inclusion Criteria:

  • Small AAA less than 5.5 cm in size
  • Over age 50

Exclusion Criteria:

  • Patients with congenital aneurysm syndromes such as Ehlers-Danlos' or Marfan's
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT00349947

Locations
United States, California
Palo Alto Veterans Affairs Health Care System
Palo Alto, California, United States
Kaiser Permanente Hospitals of Northern California
Santa Clara, California, United States
Stanford University Medical Center
Stanford, California, United States, 94305
Sponsors and Collaborators
Stanford University
Investigators
Principal Investigator: Ronald L. Dalman, MD Stanford University
  More Information

No publications provided by Stanford University

Additional publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
Responsible Party: Stanford University
ClinicalTrials.gov Identifier: NCT00349947     History of Changes
Other Study ID Numbers: 391, 5P50HL083800, P50 HL083800-01
Study First Received: July 6, 2006
Last Updated: June 5, 2013
Health Authority: United States: Federal Government

Additional relevant MeSH terms:
Aneurysm
Aortic Aneurysm
Aortic Aneurysm, Abdominal
Vascular Diseases
Cardiovascular Diseases
Aortic Diseases

ClinicalTrials.gov processed this record on October 19, 2014