Duplex Ultrasonography Performed by Nurses

Study Overview
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Brief Summary
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Catheter-related thrombosis (CRT) has been found as the major complication of the established central venous catheter in intensive care unit (ICU) patients. Its reported incidence varies from 5 to 66 %. Although most cases are asymptomatic, in up to 10 - 15 % of the patients pulmonary embolism occurs. In addition, CRT is associated with the risk of infection, post-thrombotic syndrome and with general disruption of the management of the underlying disease. The most accessible diagnostic method for CRT recognition is duplex ultrasonography. However, screening of CRT by duplex ultrasonography is not common approach in ICUs. Normally, duplex ultrasonography is performed by physicians. In this setting, implementation of the screening in ICU would be time consuming and practically unrealizable. Delegating this competence to ICU nurses can increase availability of this screening method. Therefore, as a first step, investigators decided to perform a validation clinical study to verify the diagnostic accuracy of duplex ultrasonography of the venous system for CRT screening performed by a general nurse.

Detailed Description
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Approximately 150 patients with central venous catheter will be enrolled in this study. Investigators: General nurses - trained and able to perform duplex ultrasonography examination of venous circulation Doctors - experienced specialists in intensive care or urgent medicine Every patient with central venous catheter enrolled in clinical study is examined with duplex ultrasonography within 24 hours by both investigators, doctor and nurse. Each examination includes ultrasonography of a whole vena cava venous system with central venous catheter, bilaterally. Results of both examinations are blinded until the end of study, with one exception. In case of positive result - catheter related thrombosis is present, investigator ( nurse )informs patients attending physician. Results of investigations are recorded in Investigation Form with some other routine medical data. Timetable: 18.3.2019 - 30.6.2020: Enrolling, collection of data 1.7.2020 - 30.9.2020: Finalization od database, statistic analysis 1.10.2020 - 31.1.2021: Preparation of publications 1.2. 2021 - 31.12.2021: Result presentation

Official Title
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Diagnostic Reliability of Duplex Ultrasonography of the Venous System for Screening of Catheter-related Thrombosis Performed by a General Nurse

Conditions
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Catheter Related Complication

Intervention / Treatment
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* Diagnostic Test: Duplex ultrasonography


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: central venous catheter more than 48 hours in situ consent of a patient Exclusion Criteria: technical difficulties of ultrasound machine unfavorable local findings - inflammation of skin, excoriation etc.
Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Intervention/Treatment |
| --- |
|Diagnostic Test: Duplex ultrasonography|Ultrasound examination of whole vena cava venous system with central venous catheter inserted, using duplex US method to detect catheter related thrombosis|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Incidence of catheter related thrombosis - physician and nurse | Diagnostic reliability of duplex ultrasonography examination of the venous system for screening of catheter-related thrombosis performed by a general nurse | 24hours |