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Table 2 Bedside ultrasound measurements of internal jugular vein

From: Use of ultrasound-measured internal jugular vein collapsibility index to determine static intracardiac pressures in patients with presumed pulmonary hypertension

Ultrasound measurements Mean (SD)
IJ at rest (cm) 1.17 (0.41)
IJ at inspiratory breath hold (cm) 1.39 (0.44)
IJ with external compression (cm) 0.73 (0.43)
Respiratory CI (ratio) 0.16 (0.13)
Compression CI (ratio) 0.40 (0.24)
  1. IJ internal jugular vein, CI collapsibility index