Diagnostic Accuracy of Tissue Impedance Measurement Interpretation for Correct Veress Needle Placement in Canine Cadavers

2013 ◽  
Vol 42 (5) ◽  
pp. 613-622 ◽  
Author(s):  
Jacqueline C. Whittemore ◽  
Amanda Mitchell ◽  
Sara Hyink ◽  
Ann Reed
Keyword(s):  
Diagnostic Accuracy ◽  
Impedance Measurement ◽  
Veress Needle ◽  
Needle Placement ◽  
Tissue Impedance

scholarly journals Unusually High Intra-abdominal Opening Pressure Confirmed by Simultaneous Gastric Pressure Measurement during Laparoscopy

2012 ◽  
Vol 6 (1) ◽  
pp. 12-15
Author(s):  
Richard Matulewicz ◽  
Antonio R. Gargiulo ◽  
Stephen H. Loring ◽  
Massimo Ferrigno
Keyword(s):  
Respiratory Mechanics ◽  
Obese Woman ◽  
Veress Needle ◽  
Abdominal Pressure ◽  
Needle Placement ◽  
Opening Pressure ◽  
Robot Assisted ◽  
Gastric Pressure ◽  
High Degree ◽  
Viable Method

A 28 year-old obese woman was scheduled for robot-assisted bilateral tubal re-anastomosis under general anesthesia and neuromuscular blockade. As part of a respiratory mechanics study, gastric pressure (Pga) was measured. At the beginning of the operation, the surgeon repeatedly inserted a Veress needle consistently measuring an unusually high opening pressure of 15 mmHg, at a time when Pga was 12.5 mmHg. Based on the elevated Pga values, we inferred that the high opening pressure was a valid intra-peritoneal pressure, rather than a sign of incorrect needle placement; therefore, the surgeon proceeded with uneventful insufflation of the peritoneal cavity. This patient exhibited an unusually high opening intra-abdominal pressure that likely reflected her high degree of central obesity. Simultaneous Pga determination proved valuable in confirming intra-peritoneal location of the tip of Veress needle and may be a viable method of corroborating high opening pressures despite safe needle positions in laparoscopic cases.

Blood return after Veress needle placement for left-sided thoracoscopy

2001 ◽  
Vol 15 (4) ◽  
pp. 527-528
Author(s):  
Albrecht H.K. Wobst ◽  
Emilio B. Lobato ◽  
Felipe Urdaneta
Keyword(s):  
Veress Needle ◽  
Needle Placement

scholarly journals A tissue impedance measurement chip for myocardial ischemia detection

2005 ◽  
Vol 52 (12) ◽  
pp. 2620-2628 ◽  
Author(s):  
A. Yufera ◽  
A. Rueda ◽  
J.M. Munoz ◽  
R. Doldan ◽  
G. Leger ◽  
...  
Keyword(s):  
Myocardial Ischemia ◽  
Impedance Measurement ◽  
Tissue Impedance

scholarly journals Investigation of frequency characteristics of biological tissues impedance

Radiotekhnika ◽  
2020 ◽  
pp. 186-190
Author(s):  
V.V. Semenets ◽  
V.I. Leonidov
Keyword(s):  
Biological Tissue ◽  
Measurement Method ◽  
Impedance Measurement ◽  
Thermal Exposure ◽  
Biological Tissues ◽  
Isotonic Solution ◽  
Tissue Samples ◽  
Tissue Impedance ◽  
Significant Difference ◽  
Frequency Dependences

The problem of identifying informative signs of biological tissues viability using the impedance measurement method is formulated. At present there is no instrumental base that makes it possible in an operational setting to diagnose the ability of biological tissue to heal itself after injury and damage as a result of thermal exposure, gunshot wound or prolonged compression. It is shown in this article that development of methods and tools for instrumental diagnostics in medical diagnostic practice is an important modern challenge. The results of experimental measurements of impedance characteristics in the frequency range of 20 Hz – 2.0 MHz are presented. The frequency dependences of the modulus of voltage on biological tissues of plant origin are analyzed in its intact state, as well as after exposure of biological tissue samples in a freezer at time intervals from 15 minutes to 2 hours. A comparative analysis of the obtained frequency dependences is carried out. A significant difference between the frequency dependences of the voltage modulus on biological tissues and the frequency dependence of the voltage modulus on an isotonic solution is shown. The concept is introduced that the degree of difference between the frequency distribution of the biological tissue impedance module from the impedance module of an isotonic solution can serve as a criterion for assessing the degree of damage to biological tissue. A conclusion is made about the advisability of developing the impedance measurement method as a method for diagnosing the viability of biological tissue; it is shown that the most promising approach to the development of impedance measurement methods is the analysis of transient processes when biological tissue is disturbed by small electric current pulses.

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