Comparison of the effect of Trendelenburg positions, upper-limb and Valsalva maneuver on the diameter of the right internal jugular vein, based on ultrasound for central venous catheter insertion.

Comparison study of the effect of Trendelenburg positions, upper-limb and Valsalva maneuver on the diameter of the right internal jugular vein, based on ultrasound for central venous catheter insertion.

Status

Recruiting

Phases

Phase 2

Study type

Interventional

Source

IRCT

Registry ID

IRCT20160307026950N67

Enrollment

Registered

2025-03-01

Start date

2025-02-19

Completion date

Unknown

Last updated

2025-07-21

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

diameter of the right internal jugular vein.

Interventions

Intervention 1: After measuring the diameter of the right internal jugular vein, the Valsalva maneuver is performed with 20 cm of pressure for 15 seconds and the diameter is remeasured. Intervention 2

Eligibility

Sex/Gender

All

Age

18 Years to 65 Years

Inclusion criteria

Inclusion criteria: Age 18 to 65 years old Stable hemodynamics Physical condition in ASA class I Able to perform Valsalva maneuver?the ability to raise the leg and be in the Trendelberg position

Exclusion criteria

Exclusion criteria: Patients with a history of head and neck surgery

Design outcomes

Primary

Measure	Time frame
Diameter of the right internal jugular vein. Timepoint: Measure the diameter 15 seconds after the Valsalva maneuver and 3 minutes after the Trendelenberg position and raising the limb, and there should be at least five minutes between the maneuvers. Method of measurement: (LOGIQ-e Compact Ultrasound)Ultrasound was measured with a 12 MHz linear transducer at the level of the cricoid cartilage with a 20 degree left rotation.	—

Measure

Time frame

Diameter of the right internal jugular vein. Timepoint: Measure the diameter 15 seconds after the Valsalva maneuver and 3 minutes after the Trendelenberg position and raising the limb, and there should be at least five minutes between the maneuvers. Method of measurement: (LOGIQ-e Compact Ultrasound)Ultrasound was measured with a 12 MHz linear transducer at the level of the cricoid cartilage with a 20 degree left rotation.

—

Countries

Iran (Islamic Republic of)

Contacts

Public ContactBehzad Nazem roaya

Esfahan University of Medical Sciences

behzad-nazem@med.mui.ac.ir+98 31 3662 0048

Outcome results

None listed

Source: IRCT (via WHO ICTRP) · Data processed: Feb 4, 2026