Article Figures & Data
Figures
- FIG 1.
SVC venous pressure changes with 4 different techniques relative to the SVC venous pressure while breathing at rest. End-resisted inspiration leads to the greatest drop in pressure, which is far greater than with normal inspiration.
- FIG 2.
CSF pressure changes with 4 different techniques relative to the CSF pressure while breathing at rest. CSF pressure increased the most with end-resisted inspiration, which was even greater compared with the Valsalva maneuver.
Tables
- Table 1:
Individual patient demographics and SVC manometry readings in 4 patients who underwent a catheter venogram
Venous Pressure (mm Hg) Patient Age (yr)/Sex Indication BMI Rest Pressure Valsalva Normal Inspiration Mid-Resisted Inspiration End-Resisted Inspiration 1 57/F IIH 34.5 3 11 –1 –8 –16 2 63/M Pulsatile tinnitus 24.8 1 27 –1 –15 –26 3 69/F Pulsatile tinnitus 31.6 2 25 –6 –15 –31 4 52/F IIH 42.6 10 25 8 –2 –11 Note:—F indicates female; M, male; BMI, body mass index.
- Table 2:
Individual patient demographics and lumbar CSF manometry readings in 4 patients who underwent a CT-guided LP
CSF Pressure (cm H20) Patient Age (yr)/Sex Indication BMI Rest Pressure Valsalva Normal Inspiration Mid-Resisted Inspiration End-Resisted Inspiration 1 69/F Prior idiopathic leptomeningeal enhancement 19.6 13 15 14 15 17 2 45/F New-onset psychosis 27.9 33 40 38 39 41 3 75/M Intrathecal chemotherapy 24.2 0 7 1 1 2 4 59/M Metastatic lung cancer 27.3 2 7 5 10 16 Note:—F indicates female; M, male; BMI, body mass index.
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