This video describes a technique of measuring the interstitial fluid pressure within a tumor by perfusion imaging using an image-guided robotic system. Measurements are compared to the intra-tumoral accumulation of liposomes, within a solid tumor.
Protocol
1. Spatial Measurements of Tumor Interstitial Fluid Pressure To measure IFP connect the 25 G spinal needle to the pressure transducer and to the IFP acquisition system through 50 cm of PE20 polyethylene tubing. Flush the entire system with a heparin sulfate/saline solution (1:10). Sterilize the needle with 70% isopropyl before use. Turn on the acquisition system and launch the IFP acquisition software and load the settings files to calibrate the system to acquire IFP measurements in mmHg. Click…
Offenlegungen
The authors have nothing to disclose.
Materials
Omnipaque (Iohexol) 300 mg of iodine/ml
GE Healthcare, CA
eXplore Locus Ultra micro-CT system
GE Healthcare, CA
Manipulated using CT-Console Software
27 G Catheter SURFLO Winged Infusion Set
Terumo Medical Products, USA
SV*27EL
PE20 polyethylyne tubing
Becton Dickinson, USA
427406
Pen tip 25 G × 3.5′′ Whitacre spinal needle
Becton Dickinson, USA
405140
IFP needle
P23XL pressure transducer
Harvard Apparatus, CA
P23XL
PowerLab 4/35, Bridge Amp, with LabChart Pro 7.0
ADInstruments Pty Ltd., USA
PL3504, FE221
IFP acquisition system and acquisition software
CT-Sabre Small Animall Intervention system (CT-IFP Robot)
Spatial Measurement of Tumor Interstitial Fluid Pressure: A Method to Measure the Interstitial Fluid Pressure. J. Vis. Exp. (Pending Publication), e20223, doi: (2023).