Q: What does this single or double mark near the cuff of the ETT mean if present?
Answer: Vocal Cord Markers
ETT should be placed in a way that the vocal cords are at the black mark (single mark) or keep the vocal cords between the two marks. These marking systems provide only a rough estimate; the correct ET tube position depth should always be confirmed by other means, such as CXR or ultrasound (see reference # 2)
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References:
1. Varshney M, Sharma K, Kumar R, Varshney PG. Appropriate depth of placement of oral endotracheal tube and its possible determinants in Indian adult patients. Indian J Anaesth. 2011 Sep;55(5):488-93. doi: 10.4103/0019-5049.89880. PMID: 22174466; PMCID: PMC3237149.
2. Chen X, Zhai W, Yu Z, Geng J, Li M. Determining correct tracheal tube insertion depth by measuring distance between endotracheal tube cuff and vocal cords by ultrasound in Chinese adults: a prospective case-control study. BMJ Open. 2018 Dec 6;8(12):e023374. doi: 10.1136/bmjopen-2018-023374. PMID: 30530476; PMCID: PMC628648
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