Changes in Anatomical Landmark Locations

Study Overview
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Brief Summary
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This study was performed to ultrasonographically demonstrate the changes in relationship between the right internal jugular vein (IJV) and an anatomical landmark in two different head positions: neutral and rotational.

Detailed Description
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Background: This study was performed to ultrasonographically demonstrate the changes in relationship between the right IJV and an anatomical landmark in two different head positions: neutral and rotational. Methods: One hundred patients scheduled for elective surgery under general anesthesia with endotracheal intubation were enrolled in this study. The patients were placed in the supine position with a neutral head position and without a pillow. The apex of the triangle formed by the sternal and clavicular heads of the sternocleidomastoid muscle and clavicle was marked (anatomical landmark point: AL point). The ultrasonography of the neck anatomy was performed, and a mark was placed at the central point of the IJV to the skin (ultrasonography point: US point). The other investigator measured the distances from the AL point to the US point (AL-US distance). The patient's head was then turned 30° to the left; the same procedure was repeated and the AL-US distance was again measured. The changes in AL-US distance were calculated.

Official Title
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Changes in the Relationship Between the Right Internal Jugular Vein and Anatomical Landmark After Head Rotation

Conditions
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Anesthesia, General, Intubation

Intervention / Treatment
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* Behavioral: head position change


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: 100 patients weighing 40 - 100 kg and with heights of 140 - 190 cm Exclusion Criteria: a history of neck surgery or trauma involving the neck, previous IJV-related interventions (e.g., venous catheterization), limitation of neck movement, and a body mass index ≥ 30.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 80 Years

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

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| neutral head position<br>supine with neutral head position | Behavioral: head position change<br>* AL-US distance measure using the ultrasound in two different head position<br>|
| head rotation<br>supine with 30° head rotation | Behavioral: head position change<br>* AL-US distance measure using the ultrasound in two different head position<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| anatomical landmark point (AL) - ultrasonography point (US) distance(the distances from the AL point to the US point ) | The distance between the two points was considered positive if the US point was lateral to the AL point and negative if it was medial to the AL point. | within 5 minutes after itubation | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| The average depth of the right IJV | measure the depth of the right IJV center in ultrasonography | within 5 minutes after intubation | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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jugular vein, anatomy, ultrasonography