Validity of Aortic Pulse Wave Velocity in Predicting the 6- Minute Walking Test Before Major Non-cardiac Surgery

Summary

Methods: Prospective observational study in adult patients requiring preoperative evaluation

Objectives: To determine the correlation between the aortic pulse wave velocity (AoPWV) and the distance walked in the 6-minute walk test (6MWT) Sample Size: For a desired precision of estimate of ± 0.10 (95% confidence interval) around a postulated validity correlation coefficient of r = 0.70 (for an AoPWV in the distance prediction of 6MWT) a sample of 100 patients. By allowing a 25% wear rate, a final sample size of 125 participants is required Inclusion criteria: Patients older than 18 years undergoing any surgery and who require pre-anesthesia Statistical analysis If the variables have a normal distribution, the Pearson correlation coefficient (r2) is used, which is between -1 and 1. Where -1 indicates the highest possible negative linear relationship (increasing the value of a variable decreases the another), 0 that there is no association, +1 positive correlation. From 0.7 negative or positive, it is said that the association is strong.

Linear regression models of ordinary least squares will be applied to obtain the validity coefficient (r) and the standard error of the estimate (SEE): the typical error associated with the prediction the AoPWV with the distance traveled in the 6MWD test in each individual patient. The analysis of the receiver operating characteristic curve (ROC) will be used to derive cutoff points for an AoPWV value for the prediction of a 6MWD less than 427 meters

Conditions

• Perioperative/Postoperative Complications
• Surgery
• Exercise Tolerance

Interventions

DIAGNOSTIC_TEST

Aortic pulse wave velocity measurement

Aortic pulse pulse wave velocity (AoPWV) measured by photoplethysmography

DIAGNOSTIC_TEST

6 minutes walking test

This test is performed routinely in the pre-rehabilitation units or in external anesthesiology consultations during the preoperative visit. In essence, it consists in measuring the maximum distance the patient is able to walk in 6 minutes, in a short walk in a corridor, simultaneously assessing the heart rate, oxygen saturation and the degree of dyspnea. In general, healthy people can walk between 400 and 700 meters in 6 minutes, depending on age, height and sex.

Sponsors & Collaborators

• Grupo Español de Rehabilitación Multimodal

  lead OTHER

Principal Investigators

• Javier Ripollés Melchor · Infanta Leonor University Hospital, Madrid, Spain

• Ane Abad Motos · Infanta Leonor University Hospital, Madrid, Spain

• José M Ramírez · Lozano Blesa University Hospital, Zaragoza, Spain

• César Aldecoa · Río Hortega University Hospital, Valladolid, Spain

Eligibility

Min Age

18 Years

Sex

ALL

Healthy Volunteers

Yes

Timeline & Regulatory

Start

2019-05-01

Primary Completion

2019-06-01

Completion

2019-06-01

Countries

• Spain

Study Locations