Clinical Trial Details
— Status: Completed
Administrative data
NCT number |
NCT05201755 |
Other study ID # |
Not assigned |
Secondary ID |
|
Status |
Completed |
Phase |
N/A
|
First received |
|
Last updated |
|
Start date |
February 1, 2022 |
Est. completion date |
March 31, 2022 |
Study information
Verified date |
August 2022 |
Source |
Fondazione IRCCS Ca' Granda, Ospedale Maggiore Policlinico |
Contact |
n/a |
Is FDA regulated |
No |
Health authority |
|
Study type |
Interventional
|
Clinical Trial Summary
Peripherally Inserted Central Catheters (PICC) and midline placement requires the catheter
size to be one third of the venous diameter, or less. However, measurements during CPAP
(Continous Positive Airway Pressure) might overestimate the diameter of veins in patients
requiring a PICC line.
The investigators will enroll 28 healthy subjects to measure their basilica vein diameter at
atmospheric pressure and at 10 cmH2O of Positive End-Expiratory Pressure (PEEP). PEEP will be
applied through a CPAP helmet with the straps placed under the arms or tied to the bed.
The investigators will test the hypothesis that positive airway pressure significantly
increases vein diameter. Under this hypothesis, the indication of avoiding catheters larger
than one third of the vein diameter should be revised, as venous enlargement during PEEP may
lead to the placement of inappropriately large catheters.
Description:
After consent, the investigators will enroll 28 participants, randomized with a 1:1:1:1 ratio
(sealed envelope) to one of the following groups:
A) Room air -> CPAP (armpit straps) -> CPAP (w/o straps) B) Room air -> CPAP (w/o straps) ->
CPAP (armpit straps) C) CPAP (armpit straps) -> CPAP (w/o straps) -> Room air D) CPAP (w/o
straps) -> CPAP (armpit straps) - > Room air
The investigators will exclude from the study participants with an ASA score (American
Society of Anesthesiology) of 3 or more, subjects with a BMI lower than 20 or with a history
of pneumothorax or venous thrombosis. Investigators will enroll adult patients only (age >
18).
The primary endpoint is the evaluation of a clinically significant change in venous diameter
in subjects breathing at room air or during positive pressure support.
The investigators decided to deliver CPAP through a CPAP Helmet, as this device is
noninvasive, very weill tolerated and widely used at the study hospital. CPAP Helmet are
provided with armpit straps. Secondary endpoints are the evaluation of venous flow-velocity
changes and the influence of placing the helmet straps under the armpits on venous flow
dynamics (venous diameter, flow-velocity).
The study is composed of three steps of 5 minutes each. At each step, the investigators will
use ultrasound to measure the diameter of basilica vein and venous flow-velocity at the right
mid arm, while recording basic vital signs (heart rate, non-invasive blood pressure,
pulsoximetry). The investigators will also gather basic biometric data (age, weight, height,
gender). At room air, no intervention is given: after 5 minutes, vital signs are collected
and the ultrasound measurements performed (basilica vein diameter, venous blood
flow-velocity). At CPAP (armpit straps), the subjects will wear a CPAP helmet and receive 10
cmH2O of PEEP (positive end-expiratory pressure), with the helmet straps placed under the
subjects' armpit: after 5 minutes, vital signs are collected and the ultrasound measurements
performed (basilica vein diameter, venous blood flow-velocity). At CPAP (w/o straps), the
helmet is tied to the subjects' bed: after 5 minutes, vital signs are collected and the
ultrasound measurements performed (basilica vein diameter, venous blood flow-velocity).