1
|
Taeger CD, Muehle C, Kruppa P, Prantl L, Biermann N. Negative Pressure Wound Therapy-A Vacuum-Mediated Positive Pressure Wound Therapy and a Closer Look at the Role of the Laser Doppler. J Clin Med 2024; 13:2351. [PMID: 38673623 PMCID: PMC11051509 DOI: 10.3390/jcm13082351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2024] [Revised: 04/04/2024] [Accepted: 04/11/2024] [Indexed: 04/28/2024] Open
Abstract
Background: Negative pressure wound therapy (NPWT) is an intensely investigated topic, but its mechanism of action accounts for one of the least understood ones in the area of wound healing. Apart from a misleading nomenclature, by far the most used diagnostic tool to investigate NPWT, the laser Doppler, also has its weaknesses regarding the detection of changes in blood flow and velocity. The aim of the present study is to explain laser Doppler readings within the context of NPWT influence. Methods: The cutaneous microcirculation beneath an NPWT system of 10 healthy volunteers was assessed using two different laser Dopplers (O2C/Rad-97®). This was combined with an in vitro experiment simulating the compressing and displacing forces of NPWT on the arterial and venous system. Results: Using the O2C, a baseline value of 194 and 70 arbitrary units was measured for the flow and relative hemoglobin, respectively. There was an increase in flow to 230 arbitrary units (p = 0.09) when the NPWT device was switched on. No change was seen in the relative hemoglobin (p = 0.77). With the Rad-97®, a baseline of 92.91% and 0.17% was measured for the saturation and perfusion index, respectively. No significant change in saturation was noted during the NPWT treatment phase, but the perfusion index increased to 0.32% (p = 0.04). Applying NPWT compared to the arteriovenous-vessel model resulted in a 28 mm and 10 mm increase in the venous and arterial water column, respectively. Conclusions: We suspect the vacuum-mediated positive pressure of the NPWT results in a differential displacement of the venous and arterial blood column, with stronger displacement of the venous side. This ratio may explain the increased perfusion index of the laser Doppler. Our in vitro setup supports this finding as compressive forces on the bottom of two water columns within a manometer with different resistances results in unequal displacement.
Collapse
Affiliation(s)
- Christian D. Taeger
- Department of Plastic, Hand and Reconstructive Surgery, University Hospital Regensburg, 93053 Regensburg, Germany; (C.M.); (L.P.); (N.B.)
| | - Clemens Muehle
- Department of Plastic, Hand and Reconstructive Surgery, University Hospital Regensburg, 93053 Regensburg, Germany; (C.M.); (L.P.); (N.B.)
| | - Philipp Kruppa
- Department of Plastic, Hand and Reconstructive Surgery, Ernst von Bergmann Klinikum, 14467 Potsdam, Germany;
| | - Lukas Prantl
- Department of Plastic, Hand and Reconstructive Surgery, University Hospital Regensburg, 93053 Regensburg, Germany; (C.M.); (L.P.); (N.B.)
| | - Niklas Biermann
- Department of Plastic, Hand and Reconstructive Surgery, University Hospital Regensburg, 93053 Regensburg, Germany; (C.M.); (L.P.); (N.B.)
| |
Collapse
|
2
|
Biermann N, Geissler EK, Brix E, Schiltz D, Muehle C, Prantl L, Taeger CD. Pressure distribution and flow characteristics during negative pressure wound therapy. J Tissue Viability 2020; 29:32-36. [DOI: 10.1016/j.jtv.2019.12.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2019] [Revised: 12/15/2019] [Accepted: 12/17/2019] [Indexed: 01/13/2023]
|
3
|
Santamaría-Pérez D, Daisenberger D, Ruiz-Fuertes J, Marqueño T, Chulia-Jordan R, Muehle C, Jansen M, Rodriguez-Hernandez P, Muñoz A, Johnson ER, Otero-de-la-Roza A. Gold(i) sulfide: unusual bonding and an unexpected computational challenge in a simple solid. Chem Sci 2019; 10:6467-6475. [PMID: 31341598 PMCID: PMC6610519 DOI: 10.1039/c9sc00371a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Accepted: 05/19/2019] [Indexed: 11/23/2022] Open
Abstract
We report the experimental high-pressure crystal structure and equation of state of gold(i) sulfide (Au2S) determined using diamond-anvil cell synchrotron X-ray diffraction. Our data shows that Au2S has a simple cubic structure with six atoms in the unit cell (four Au in linear, and two S in tetrahedral, coordination), no internal degrees of freedom, and relatively low bulk modulus. Despite its structural simplicity, Au2S displays very unusual chemical bonding. The very similar and relatively high electronegativities of Au and S rule out any significant metallic or ionic character. Using a simple valence bond (Lewis) model, we argue that the Au2S crystal possesses two different types of covalent bonds: dative and shared. These bonds are distributed in such a way that each Au atom engages in one bond of each kind. The multiple arrangements in space of dative and shared bonds are degenerate, and the multiplicity of configurations imparts the system with multireference character, which is highly unusual for an extended solid. The other striking feature of this system is that common computational (DFT) methods fail quite spectacularly to describe it, with 20% and 400% errors in the equilibrium volume and bulk modulus, respectively. We explain this by the poor treatment of static correlation in common density-functional approximations. The fact that the solid is structurally very simple, yet presents unique chemical bonding and is unmodelable using current DFT methods, makes it an interesting case study and a computational challenge.
Collapse
Affiliation(s)
- D Santamaría-Pérez
- Departamento de Física Aplicada-ICMUV , Universidad de Valencia , MALTA Consolider Team , Edificio de Investigación, C/Dr Moliner 50, E-46100 Burjassot , Valencia , Spain .
| | | | - J Ruiz-Fuertes
- DCITIMAC , Universidad de Cantabria , Avenida de Los Castros 48 , 39005 Santander , Spain
| | - T Marqueño
- Departamento de Física Aplicada-ICMUV , Universidad de Valencia , MALTA Consolider Team , Edificio de Investigación, C/Dr Moliner 50, E-46100 Burjassot , Valencia , Spain .
| | - R Chulia-Jordan
- Departamento de Física Aplicada-ICMUV , Universidad de Valencia , MALTA Consolider Team , Edificio de Investigación, C/Dr Moliner 50, E-46100 Burjassot , Valencia , Spain .
| | - C Muehle
- Max Planck Institute for Solid State Research , Heisenbergstrasse 1 , 70569 Stuttgart , Germany
| | - M Jansen
- Max Planck Institute for Solid State Research , Heisenbergstrasse 1 , 70569 Stuttgart , Germany
| | - P Rodriguez-Hernandez
- Departamento de Física , Instituto de Materiales y Nanotecnología , Universidad de La Laguna , MALTA Consolider Team , E-38206 La Laguna , Tenerife , Spain
| | - A Muñoz
- Departamento de Física , Instituto de Materiales y Nanotecnología , Universidad de La Laguna , MALTA Consolider Team , E-38206 La Laguna , Tenerife , Spain
| | - Erin R Johnson
- Department of Chemistry , Dalhousie University , 6274 Coburg Road , Halifax , Nova Scotia , Canada B3H 4R2
| | - A Otero-de-la-Roza
- Departamento de Química Física y Analítica , Facultad de Química , Universidad de Oviedo , 33006 Oviedo , Spain .
| |
Collapse
|
5
|
Santamaría-Pérez D, Vegas A, Muehle C, Jansen M. Study of the behavior of alkali sulfides under pressure. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311087253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
6
|
Santamaría-Pérez D, Vegas A, Muehle C, Jansen M. Structural behaviour of alkaline sulfides under compression: High-pressure experimental study on Cs2S. J Chem Phys 2011; 135:054511. [PMID: 21823716 DOI: 10.1063/1.3617236] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- D Santamaría-Pérez
- Departamento de Química Física I, Universidad Complutense de Madrid, Madrid, Spain.
| | | | | | | |
Collapse
|
7
|
Schneider H, Muehle C. Gene symbol: LAMB3. Disease: junctional epidermolysis bullosa, Herlitz variant. Hum Genet 2005; 118:545. [PMID: 16521295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Affiliation(s)
- H Schneider
- Children's Hospital and Department of Experimental Medicine I, Nikolaus fiebiger Centre of Molecular Medicine, University of Erlangen-Nuernberg, Germanyy.
| | | |
Collapse
|
8
|
Schneider H, Muehle C. Gene symbol: KRT14. Disease: Epidermolysis bullosa simplex. Hum Genet 2005; 117:298. [PMID: 16156024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Affiliation(s)
- H Schneider
- Children's Hospital and Nikolaus Fiebiger Centre of Molecular Medicine, University of Erlangen-Nuernberg, Loschgestrasse 15, 91054 Erlangen, Germany.
| | | |
Collapse
|