Monitoring of water content and water distribution in ischemic hearts

Schaefer, Michael; Groß, Wolfgang; Preuss, Martin; Ackemann, Juergen; Gebhard, Martha-Maria

doi:10.1016/j.bioelechem.2003.08.001

Cited by 8 publications

(4 citation statements)

References 28 publications

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“…The increasing proton and lactate concentration cause a decrease in intracellular pH value and an increase in conductivity in the intracellular space (Schaefer et al 2003). An increase in conductivity in the intracellular space resulted in an increase in ε′ and in σ′ at 10 MHz due to the simulation with the electrical heart model (see figure 6(d)).…”

Section: The Dielectric Permittivity and Conductivity At 10 Mhz And T...mentioning

confidence: 98%

Hearts during ischemia with or without HTK-protection analysed by dielectric spectroscopy

Schaefer

Groß²,

Gebhard³

2018

Physiol. Meas.

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Section: The Dielectric Permittivity and Conductivity At 10 Mhz And T...mentioning

confidence: 98%

Hearts during ischemia with or without HTK-protection analysed by dielectric spectroscopy

Schaefer

Groß²,

Gebhard³

2018

Physiol. Meas.

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“…While analyzing scar tissues in VF, the progressive changes in tissues during ischemia were observed to be in direct correlation with alterations in the electrical impedance of the cardiac tissues measured during ischemia [67,68]. M. Schaefer et al conducted studies [69,70] to assess the dielectric spectrum of cardiac tissues in ischemia. These studies observed that the dielectric permittivity of the heart was increased after artificially induced ischemia [69,70].…”

Section: The Use Of Microwaves For Catheter Ablationmentioning

confidence: 99%

“…M. Schaefer et al conducted studies [69,70] to assess the dielectric spectrum of cardiac tissues in ischemia. These studies observed that the dielectric permittivity of the heart was increased after artificially induced ischemia [69,70]. The postulated reason behind this change was the closure of gap junctions within ischemic tissue resulting in alterations in the movement of ions.…”

Section: The Use Of Microwaves For Catheter Ablationmentioning

confidence: 99%

Microwave-Based Dielectric Properties as an Electrophysiological Biomarker: Future Perspectives

Cherukuri,

Modi,

Baraskar

et al. 2023

Electronics

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Electrophysiology is the study of the electrical properties of biological tissues, which involves the movement of ions across cell membranes. The analysis of the movement of electrical charges through the body has a wide range of biomedical applications, such as diagnosing and planning treatment in cardiovascular, nervous systems, muscular, and gastrointestinal disorders. The dielectric properties of biological tissues change according to the water content in the tissue and are measured as permittivity and conductivity relative to the frequency of the electrical field. This principle has been applied in diagnostics and therapeutics using microwave energysuch as imaging and ablation, etc. This review article summarizes the potential use of measuring dielectric properties using microwave imaging and how it can augment electrophysiological studies in medicine.

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“…with dry = 1.4 g/cm 3 [15] and w = 1.0 g/cm 3 . Analogously, equation 5 was used for the calculation of DMC weight that was determined by drying and weighing: …”

Section: Determination Of Dry-to-wet Ratio By Microwave Refl Ectometrymentioning

confidence: 99%

Monitoring of Lung Edema by Microwave Reflectometry during Lung Ischemia-Reperfusion Injury in vivo

et al. 2006

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It is still unclear whether lung edema can be monitored by microwave reflectometry and whether the measured changes in lung dry matter content (DMC) are accompanied by changes in PaO₂ and in pro- to anti-inflammatory cytokine expression (IFN-γ and IL-10). Right rat lung hili were cross-clamped at 37°C for 0, 60, 90 or 120 min ischemia followed by 120 min reperfusion. After 90 min (DMC: 15.9 ± 1.4%; PaO₂: 76.7 ± 18 mm Hg) and 120 min ischemia (DMC: 12.8 ± 0.6%; PaO₂: 43 ± 7 mm Hg), a significant decrease in DMC and PaO₂ throughout reperfusion compared to 0 min ischemia (DMC: 19.5 ± 1.11%; PaO₂: 247 ± 33 mm Hg; p < 0.05) was observed. DMC and PaO₂ decreased after 60 min ischemia but recovered during reperfusion (DMC: 18.5 ± 2.4%; PaO₂: 173 ± 30 mm Hg). DMC values reflected changes on the physiological and molecular level. In conclusion, lung edema monitoring by microwave reflectometry might become a tool for the thoracic surgeon.

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Monitoring of water content and water distribution in ischemic hearts

Cited by 8 publications

References 28 publications

Hearts during ischemia with or without HTK-protection analysed by dielectric spectroscopy

Hearts during ischemia with or without HTK-protection analysed by dielectric spectroscopy

Microwave-Based Dielectric Properties as an Electrophysiological Biomarker: Future Perspectives

Monitoring of Lung Edema by Microwave Reflectometry during Lung Ischemia-Reperfusion Injury in vivo

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