Non-Invasive CVP Method to Standard CVP Method
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|ClinicalTrials.gov Identifier: NCT03705299|
Recruitment Status : Completed
First Posted : October 15, 2018
Last Update Posted : October 15, 2018
|Condition or disease||Intervention/treatment||Phase|
|Central Venous Pressure||Device: Non-Invasive CVP vs Standard CVP||Not Applicable|
Standard CVP Method
The CVP line is inserted into the internal jugular vein central venous catheter or subclavian vein catheter and threaded to the point where the superior vena cava meets the inferior vena cava prior to entry into the right atrium of the heart. The catheter is hooked to a pressure bag which is pressurized to 200 cm water. This pressure allows the infusion of about 3ml of fluid each hour but keeps the line patent. The distal tip of the CVP line is connected to a transducer and taped to the arm at a level which is in line with the heart.
Research Procedure (non-invasive CVP Method)
A physiologic data acquisition system (Zoe Medical, Topsfield MA)) will be used to monitor CVP, upper arm impedance changes, and upper arm cuff pressures.
The subject's CVP pressure transducer will be zeroed at the level of the right atrium (midaxillary line) with the use of a carpenter's level.
A tetra-polar impedance configuration will be used to measure upper arm impedance. A pair of current-injecting electrodes will be placed in positions 1 & 4 and two sensing electrodes will be placed in positions 2 & 3 (where a traditional blood pressure cuff would be positioned, overlying the brachial-axillary vein system). These leads extend from the Zoe Medical device. (Figure 1 taken from Ward et al., in press).
Electrobioimpedance will be measured in the upper portion of an upper extremity using an electrobioimpedance amplifier contained within the Zoe Medical device. A constant current source (1mA, 100kHz) will be sent through the current electrode and the voltage drop between the two sensing electrodes will be amplified.
A blood pressure cuff attached to the Zoe Medical Device will be positioned over the two sensing electrodes.
The cuff pressure will be quickly inflated to a value higher than CVP but lower than the diastolic arterial pressure (40 mm Hg) and kept at that pressure for 45-60 seconds.
At the end of the inflation hold period, release the cuff pressure valve and open to atmosphere to allow rapid self-deflation
Repeat measures 3 times in each subject for a period of 10 minutes
If the subject requires volume resuscitation, diuresis, or are administered inotropic drugs, we will reevaluate CVP with the non-invasive method during these circumstances. CVP will be measured every 1 minute to capture rapid changes in CVP. The length of time that the investigators monitor CVP will depend on the length of time required to detect changes in CVP.
|Study Type :||Interventional (Clinical Trial)|
|Actual Enrollment :||40 participants|
|Intervention Model:||Single Group Assignment|
|Masking:||None (Open Label)|
|Official Title:||A Prospective, Comparative Study to Evaluate the Accuracy of a Non-Invasive Central Venous Pressure Method to the Standard CVP Method|
|Actual Study Start Date :||November 12, 2012|
|Actual Primary Completion Date :||April 6, 2018|
|Actual Study Completion Date :||April 6, 2018|
Experimental: NeuMeDex NICVP (Non-Invasive CVP) vs Standard CVP
Three pressure readings recorded for both NeuMeDex NICVP and central line pressure catheter over a 10 minute period.
Device: Non-Invasive CVP vs Standard CVP
- Assessing if the NeuMeDx NICVP device is as effective as the standard invasive method at measuring CVP in patients that require central catheter placement and monitoring. [ Time Frame: 6 months ]The primary objective of the study is to measure the CVP using the NeuMeDx NICVP (Non-Invasive Central Venous Pressure) device. The critical endpoint is the average of the average of three CVP, by calibrated forced transducer, and NICVP measurements in mmHg over a 10-minute period in a patient in the supine position.
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT03705299
|Principal Investigator:||Irwin Gratz, DO||The Cooper Health System|