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Ye C, Kawasaki M, Nakano K, Ohnishi T, Watanabe E, Oda S, Nakada TA, Haneishi H. Acquisition and Analysis of Microcirculation Image in Septic Model Rats. SENSORS (BASEL, SWITZERLAND) 2022; 22:8471. [PMID: 36366167 PMCID: PMC9659045 DOI: 10.3390/s22218471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Accepted: 10/28/2022] [Indexed: 06/16/2023]
Abstract
Background: Microcirculation is a vital sign that supplies oxygen and nutrients to maintain normal life activities. Sepsis typically influences the operation of microcirculation, which is recovered by the administration of medicine injection. Objective: Sepsis-induced variation and recovery of microcirculation are quantitatively detected using microcirculation images acquired by a non-contact imaging setup, which might assist the clinical diagnosis and therapy of sepsis. Methods: In this study, a non-contact imaging setup was first used to record images of microcirculation on the back of model rats. Specifically, the model rats were divided into three groups: (i) the sham group as a control group; (ii) the cecum ligation and puncture (CLP) group with sepsis; and (iii) the CLP+thrombomodulin (TM) group with sepsis and the application of TM alfa therapy. Furthermore, considering the sparsity of red blood cells (RBCs), the blood velocity is estimated by robust principal component analysis (RPCA) and U-net, and the blood vessel diameter is estimated by the contrast difference between the blood vessel and tissue. Results and Effectiveness: In the experiments, the continuous degradation of the estimated blood velocity and blood vessel diameter in the CLP group and the recovery after degradation of those in the CLP+TM group were quantitatively observed. The variation tendencies of the estimated blood velocity and blood vessel diameter in each group suggested the effects of sepsis and its corresponding therapy.
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Affiliation(s)
- Chen Ye
- Center for Frontier Medical Engineering, Chiba University, Chiba 263-8522, Japan
| | - Mami Kawasaki
- Graduate School of Science and Engineering, Chiba University, Chiba 263-8522, Japan
| | - Kazuya Nakano
- Faculty of Science and Technology, Seikei University, Tokyo 180-8633, Japan
| | - Takashi Ohnishi
- Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - Eizo Watanabe
- Department of Emergency and Critical Care Medicine, Graduate School of Medicine, Chiba University, Chiba 263-8522, Japan
| | - Shigeto Oda
- Department of Emergency and Critical Care Medicine, Graduate School of Medicine, Chiba University, Chiba 263-8522, Japan
| | - Taka-Aki Nakada
- Department of Emergency and Critical Care Medicine, Graduate School of Medicine, Chiba University, Chiba 263-8522, Japan
| | - Hideaki Haneishi
- Center for Frontier Medical Engineering, Chiba University, Chiba 263-8522, Japan
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2
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Optoacoustic Imaging Offers New Insights into In Vivo Human Skin Vascular Physiology. Life (Basel) 2022; 12:life12101628. [PMID: 36295063 PMCID: PMC9605317 DOI: 10.3390/life12101628] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 10/08/2022] [Accepted: 10/14/2022] [Indexed: 11/18/2022] Open
Abstract
Functional imaging with new photoacoustic tomography (PAT) offers improved spatial and temporal resolution quality in in vivo human skin vascular assessments. In the present study, we followed a suprasystolic reactive hyperemia (RH) maneuver with a multi-spectral optoacoustic tomography (MSOT) system. A convenience sample of ten participants, both sexes, mean age of 35.8 ± 13.3 years old, was selected. All procedures were in accordance with the principles of good clinical practice and approved by the institutional ethics committee. Images were obtained at baseline (resting), during occlusion, and immediately after pressure release. Observations of the RH by PAT identified superficial and deeper vascular structures parallel to the skin surface as part of the human skin vascular plexus. Furthermore, PAT revealed that the suprasystolic occlusion impacts both plexus differently, practically obliterating the superficial smaller vessels and evoking stasis at the deeper, larger structures in real-time (live) conditions. This dual effect of RH on the skin plexus has not been explored and is not considered in clinical settings. Thus, RH seems to represent much more than the local microvascular reperfusion as typically described, and PAT offers a vast potential for vascular clinical and preclinical research.
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3
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Aghabaglou F, Ainechi A, Abramson H, Curry E, Kaovasia TP, Kamal S, Acord M, Mahapatra S, Pustavoitau A, Smith B, Azadi J, Son JK, Suk I, Theodore N, Tyler BM, Manbachi A. Ultrasound monitoring of microcirculation: An original study from the laboratory bench to the clinic. Microcirculation 2022; 29:e12770. [PMID: 35611457 PMCID: PMC9786257 DOI: 10.1111/micc.12770] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 04/08/2022] [Accepted: 05/20/2022] [Indexed: 12/30/2022]
Abstract
OBJECTIVE Monitoring microcirculation and visualizing microvasculature are critical for providing diagnosis to medical professionals and guiding clinical interventions. Ultrasound provides a medium for monitoring and visualization; however, there are challenges due to the complex microscale geometry of the vasculature and difficulties associated with quantifying perfusion. Here, we studied established and state-of-the-art ultrasonic modalities (using six probes) to compare their detection of slow flow in small microvasculature. METHODS Five ultrasonic modalities were studied: grayscale, color Doppler, power Doppler, superb microvascular imaging (SMI), and microflow imaging (MFI), using six linear probes across two ultrasound scanners. Image readability was blindly scored by radiologists and quantified for evaluation. Vasculature visualization was investigated both in vitro (resolution and flow characterization) and in vivo (fingertip microvasculature detection). RESULTS Superb Microvascular Imaging (SMI) and Micro Flow Imaging (MFI) modalities provided superior images when compared with conventional ultrasound imaging modalities both in vitro and in vivo. The choice of probe played a significant difference in detectability. The slowest flow detected (in the lab) was 0.1885 ml/s and small microvasculature of the fingertip were visualized. CONCLUSIONS Our data demonstrated that SMI and MFI used with vascular probes operating at higher frequencies provided resolutions acceptable for microvasculature visualization, paving the path for future development of ultrasound devices for microcirculation monitoring.
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Affiliation(s)
- Fariba Aghabaglou
- Department of Neurosurgery, School of MedicineJohns Hopkins UniversityBaltimoreMarylandUSA,Department of Biomedical EngineeringJohns Hopkins UniversityBaltimoreMarylandUSA,HEPIUS Innovation Laboratory, School of MedicineJohns Hopkins UniversityBaltimoreMarylandUSA
| | - Ana Ainechi
- Department of Neurosurgery, School of MedicineJohns Hopkins UniversityBaltimoreMarylandUSA,HEPIUS Innovation Laboratory, School of MedicineJohns Hopkins UniversityBaltimoreMarylandUSA
| | - Haley Abramson
- Department of Biomedical EngineeringJohns Hopkins UniversityBaltimoreMarylandUSA,HEPIUS Innovation Laboratory, School of MedicineJohns Hopkins UniversityBaltimoreMarylandUSA
| | - Eli Curry
- Department of Neurosurgery, School of MedicineJohns Hopkins UniversityBaltimoreMarylandUSA,Department of Biomedical EngineeringJohns Hopkins UniversityBaltimoreMarylandUSA,HEPIUS Innovation Laboratory, School of MedicineJohns Hopkins UniversityBaltimoreMarylandUSA
| | - Tarana Parvez Kaovasia
- Department of Biomedical EngineeringJohns Hopkins UniversityBaltimoreMarylandUSA,HEPIUS Innovation Laboratory, School of MedicineJohns Hopkins UniversityBaltimoreMarylandUSA
| | - Serene Kamal
- HEPIUS Innovation Laboratory, School of MedicineJohns Hopkins UniversityBaltimoreMarylandUSA,Department of Electrical and Computer EngineeringJohns Hopkins UniversityBaltimoreMarylandUSA
| | - Molly Acord
- Department of Biomedical EngineeringJohns Hopkins UniversityBaltimoreMarylandUSA,HEPIUS Innovation Laboratory, School of MedicineJohns Hopkins UniversityBaltimoreMarylandUSA
| | - Smruti Mahapatra
- Department of Biomedical EngineeringJohns Hopkins UniversityBaltimoreMarylandUSA,HEPIUS Innovation Laboratory, School of MedicineJohns Hopkins UniversityBaltimoreMarylandUSA
| | - Aliaksei Pustavoitau
- Department of Anesthesiology and Critical Care, School of MedicineJohns Hopkins UniversityBaltimoreMarylandUSA
| | - Beth Smith
- Department of Radiology and Radiological Science, School of MedicineJohns Hopkins UniversityBaltimoreMarylandUSA
| | - Javad Azadi
- Department of Radiology and Radiological Science, School of MedicineJohns Hopkins UniversityBaltimoreMarylandUSA
| | - Jennifer K. Son
- Department of Radiology and Radiological Science, School of MedicineJohns Hopkins UniversityBaltimoreMarylandUSA
| | - Ian Suk
- Department of Neurosurgery, School of MedicineJohns Hopkins UniversityBaltimoreMarylandUSA
| | - Nicholas Theodore
- Department of Neurosurgery, School of MedicineJohns Hopkins UniversityBaltimoreMarylandUSA,HEPIUS Innovation Laboratory, School of MedicineJohns Hopkins UniversityBaltimoreMarylandUSA
| | - Betty M. Tyler
- Department of Neurosurgery, School of MedicineJohns Hopkins UniversityBaltimoreMarylandUSA,HEPIUS Innovation Laboratory, School of MedicineJohns Hopkins UniversityBaltimoreMarylandUSA
| | - Amir Manbachi
- Department of Neurosurgery, School of MedicineJohns Hopkins UniversityBaltimoreMarylandUSA,Department of Biomedical EngineeringJohns Hopkins UniversityBaltimoreMarylandUSA,HEPIUS Innovation Laboratory, School of MedicineJohns Hopkins UniversityBaltimoreMarylandUSA,Department of Electrical and Computer EngineeringJohns Hopkins UniversityBaltimoreMarylandUSA,Department of Mechanical EngineeringJohns Hopkins UniversityBaltimoreMarylandUSA
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4
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Fridman L, Yelin D. Measuring the red blood cell shape in capillary flow using spectrally encoded flow cytometry. BIOMEDICAL OPTICS EXPRESS 2022; 13:4583-4591. [PMID: 36187245 PMCID: PMC9484409 DOI: 10.1364/boe.464875] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 06/30/2022] [Accepted: 07/06/2022] [Indexed: 05/31/2023]
Abstract
Red blood cells in small capillaries exhibit a wide variety of deformations that reflect their true physiological conditions at these important locations. By applying a technique for the high-speed microscopy of flowing cells, termed spectrally encoded flow cytometry (SEFC), we image the light reflected from the red blood cells in human capillaries, and propose an analytical slipper-like model for the cell morphology that can reproduce the experimental in vivo images. The results of this work would be useful for studying the unique flow conditions in these vessels, and for extracting useful clinical parameters that reflect the true physiology of the blood cells in situ.
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5
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Berhouma M, Eker OF, Dailler F, Rheims S, Balanca B. Cortical Spreading Depolarizations in Aneurysmal Subarachnoid Hemorrhage: An Overview of Current Knowledge and Future Perspectives. Adv Tech Stand Neurosurg 2022; 45:229-244. [PMID: 35976452 DOI: 10.1007/978-3-030-99166-1_7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Despite significant advances in the management of aneurysmal subarachnoid hemorrhage (SAH), morbidity and mortality remain devastating particularly for high-grade SAH. Poor functional outcome usually results from delayed cerebral ischemia (DCI). The pathogenesis of DCI during aneurysmal SAH has historically been attributed to cerebral vasospasm, but spreading depolarizations (SDs) are now considered to play a central role in DCI. During SAH, SDs may produce an inverse hemodynamic response leading to spreading ischemia. Several animal models have contributed to a better understanding of the pathogenesis of SDs during aneurysmal SAH and provided new therapeutic approaches including N-methyl-D-aspartate receptor antagonists and phosphodiesterase inhibitors. Herein we review the current knowledge in the field of SDs' pathogenesis and we detail the key experimental and clinical studies that have opened interesting new therapeutic approaches to prevent DCI in aneurysmal SAH.
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Affiliation(s)
- Moncef Berhouma
- Department of Neurosurgical Oncology and Vascular Neurosurgery, Pierre Wertheimer Neurological and Neurosurgical Hospital, Hospices Civils de Lyon (Lyon University Hospital), Lyon, France.
- Creatis Lab, CNRS UMR 5220, INSERM U1206, Lyon 1 University, INSA Lyon, Lyon, France.
| | - Omer Faruk Eker
- Creatis Lab, CNRS UMR 5220, INSERM U1206, Lyon 1 University, INSA Lyon, Lyon, France
- Department of Interventional Neuroradiology, Pierre Wertheimer Neurological and Neurosurgical Hospital, Hospices Civils de Lyon (Lyon University Hospital), Lyon, France
| | - Frederic Dailler
- Department of Neuro-Anesthesia and Neuro-Critical Care, Pierre Wertheimer Neurological and Neurosurgical Hospital, Hospices Civils de Lyon (Lyon University Hospital), Lyon, France
| | - Sylvain Rheims
- Department of Functional Neurology and Epileptology, Pierre Wertheimer Neurological and Neurosurgical Hospital, Hospices Civils de Lyon (Lyon University Hospital), Lyon, France
- Lyon's Neurosciences Research Center, INSERM U1028/CNRS, UMR 5292, University of Lyon, Lyon, France
| | - Baptiste Balanca
- Department of Neuro-Anesthesia and Neuro-Critical Care, Pierre Wertheimer Neurological and Neurosurgical Hospital, Hospices Civils de Lyon (Lyon University Hospital), Lyon, France
- Lyon's Neurosciences Research Center, INSERM U1028/CNRS, UMR 5292, University of Lyon, Lyon, France
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Tahhan N, Balanca B, Fierstra J, Waelchli T, Picart T, Dumot C, Eker O, Marinesco S, Radovanovic I, Cotton F, Berhouma M. Intraoperative cerebral blood flow monitoring in neurosurgery: A review of contemporary technologies and emerging perspectives. Neurochirurgie 2021; 68:414-425. [PMID: 34895896 DOI: 10.1016/j.neuchi.2021.10.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 09/30/2021] [Accepted: 10/12/2021] [Indexed: 10/19/2022]
Abstract
Intraoperative monitoring of cerebral blood flow (CBF) has become an invaluable adjunct to vascular and oncological neurosurgery, reducing the risk of postoperative morbidity and mortality. Several technologies have been developed during the last two decades, including laser-based techniques, videomicroscopy, intraoperative MRI, indocyanine green angiography, and thermography. Although these technologies have been thoroughly studied and clinically applied outside the operative room, current practice lacks an optimal technology that perfectly fits the workflow within the neurosurgical operative room. The different available technologies have specific strengths but suffer several drawbacks, mainly including limited spatial and/or temporal resolution. An optimal CBF monitoring technology should meet particular criteria for intraoperative use: excellent spatial and temporal resolution, integration in the operative workflow, real-time quantitative monitoring, ease of use, and non-contact technique. We here review the main contemporary technologies for intraoperative CBF monitoring and their current and potential future applications in neurosurgery.
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Affiliation(s)
- N Tahhan
- Department of Neurosurgical Oncology and Vascular Neurosurgery, Pierre Wertheimer Neurological and Neurosurgical Hospital, University of Lyon - Hospices Civils de Lyon, 59, boulevard Pinel, 69003 Lyon, France
| | - B Balanca
- Department of Neuro-Anesthesia and Neuro-Critical Care, Pierre Wertheimer Neurological and Neurosurgical Hospital, Hospices Civils de Lyon, Lyon, France; Lyon Neuroscience Research Center, TIGER team and AniRA-Beliv technological platform, Inserm U2018, CNRS UMR 5292, Lyon 1 University, Lyon, France
| | - J Fierstra
- Department of Neurosurgery, Clinical Neuroscience Center, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - T Waelchli
- Division of Neurosurgery, Toronto Western Hospital, University of Toronto, Toronto, Canada
| | - T Picart
- Department of Neurosurgical Oncology and Vascular Neurosurgery, Pierre Wertheimer Neurological and Neurosurgical Hospital, University of Lyon - Hospices Civils de Lyon, 59, boulevard Pinel, 69003 Lyon, France
| | - C Dumot
- Department of Neurosurgical Oncology and Vascular Neurosurgery, Pierre Wertheimer Neurological and Neurosurgical Hospital, University of Lyon - Hospices Civils de Lyon, 59, boulevard Pinel, 69003 Lyon, France
| | - O Eker
- Department of Interventional Neuroradiology, Pierre Wertheimer Neurological and Neurosurgical Hospital, Hospices Civils de Lyon, Lyon, France
| | - S Marinesco
- Lyon Neuroscience Research Center, TIGER team and AniRA-Beliv technological platform, Inserm U2018, CNRS UMR 5292, Lyon 1 University, Lyon, France
| | - I Radovanovic
- Division of Neurosurgery, Toronto Western Hospital, University of Toronto, Toronto, Canada
| | - F Cotton
- Department of Imaging, Centre Hospitalier Lyon Sud, Hospices Civils de Lyon, Lyon, France; Creatis Lab - CNRS UMR 5220 - INSERM U1206, Lyon 1 University, INSA Lyon, Lyon, France
| | - M Berhouma
- Department of Neurosurgical Oncology and Vascular Neurosurgery, Pierre Wertheimer Neurological and Neurosurgical Hospital, University of Lyon - Hospices Civils de Lyon, 59, boulevard Pinel, 69003 Lyon, France; Division of Neurosurgery, Toronto Western Hospital, University of Toronto, Toronto, Canada; Creatis Lab - CNRS UMR 5220 - INSERM U1206, Lyon 1 University, INSA Lyon, Lyon, France.
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7
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New mechanism-based approaches to treating and evaluating the vasculopathy of scleroderma. Curr Opin Rheumatol 2021; 33:471-479. [PMID: 34402454 DOI: 10.1097/bor.0000000000000830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
PURPOSE OF REVIEW Utilizing recent insight into the vasculopathy of scleroderma (SSc), the review will highlight new opportunities for evaluating and treating the disease by promoting stabilization and protection of the microvasculature. RECENT FINDINGS Endothelial junctional signaling initiated by vascular endothelial-cadherin (VE-cadherin) and Tie2 receptors, which are fundamental to promoting vascular health and stability, are disrupted in SSc. This would be expected to not only diminish their protective activity, but also increase pathological processes that are normally restrained by these signaling mediators, resulting in pathological changes in vascular function and structure. Indeed, key features of SSc vasculopathy, from the earliest signs of edema and puffy fingers to pathological disruption of hemodynamics, nutritional blood flow, capillary structure and angiogenesis are all consistent with this altered endothelial signaling. It also likely contributes to further progression of the disease including tissue fibrosis, and organ and tissue injury. SUMMARY Restoring protective endothelial junctional signaling should combat the vasculopathy of SSc and prevent further deterioration in vascular and organ function. Indeed, this type of targeted approach has achieved remarkable results in preclinical models for other diseases. Furthermore, tracking this endothelial junctional signaling, for example by assessing vascular permeability, should facilitate insight into disease progression and its response to therapy.
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8
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Saknite I, Zhao Z, Patrinely JR, Byrne M, Jagasia M, Tkaczyk ER. Individual cell motion in healthy human skin microvasculature by reflectance confocal video microscopy. Microcirculation 2020; 27:e12621. [PMID: 32304109 PMCID: PMC7554192 DOI: 10.1111/micc.12621] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Revised: 03/06/2020] [Accepted: 04/11/2020] [Indexed: 12/14/2022]
Abstract
OBJECTIVE To describe upper dermal microvasculature of healthy human skin in terms of density and size of cutaneous blood vessels, leukocyte velocity, and leukocyte interactions with the endothelium. METHODS We used a reflectance confocal microscope, the VivaScope 1500, to acquire videos of individual cell motion. RESULTS We found no rolling leukocytes in the upper microvasculature of ten healthy subjects. We observed "paused" leukocytes, that is, leukocytes that temporarily stop, coinciding with the simultaneous stopping of the rest of the blood flow. We imaged more paused (median: 1.0 per subject) and adherent (1.5) leukocytes in the forearm than in the chest (median 0 paused and 0 adherent per subject) per 5 minutes of videos per body site. Leukocytes were paused for a median of 7 seconds in the forearm and 3 seconds in the chest, and we found no correlation between this parameter and the blood vessel or leukocyte size. We visualized blood flow change direction. Flowing leukocyte velocities followed a lognormal distribution and were on average higher in the chest (117 µm/s) than in the forearm (66 µm/s). CONCLUSION The proposed method and reported values in healthy skin provide new insights into intact human skin microcirculation.
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Affiliation(s)
- Inga Saknite
- Vanderbilt Dermatology Translational Research Clinic,
Department of Dermatology, Vanderbilt University Medical Center, Nashville, TN,
USA
| | - Zijun Zhao
- Vanderbilt Dermatology Translational Research Clinic,
Department of Dermatology, Vanderbilt University Medical Center, Nashville, TN,
USA
- Dermatology Service and Research Service, Tennessee Valley
Healthcare System, Department of Veterans Affairs, Nashville, TN, USA
- Vanderbilt University School of Medicine, Nashville, TN,
USA
| | - J. Randall Patrinely
- Vanderbilt Dermatology Translational Research Clinic,
Department of Dermatology, Vanderbilt University Medical Center, Nashville, TN,
USA
- Dermatology Service and Research Service, Tennessee Valley
Healthcare System, Department of Veterans Affairs, Nashville, TN, USA
- Vanderbilt University School of Medicine, Nashville, TN,
USA
| | - Michael Byrne
- Division of Hematology/Oncology, Department of Medicine,
Vanderbilt University Medical Center, Nashville, TN, USA
- Vanderbilt-Ingram Cancer Center, Nashville, TN, USA
| | - Madan Jagasia
- Division of Hematology/Oncology, Department of Medicine,
Vanderbilt University Medical Center, Nashville, TN, USA
- Vanderbilt-Ingram Cancer Center, Nashville, TN, USA
| | - Eric R. Tkaczyk
- Vanderbilt Dermatology Translational Research Clinic,
Department of Dermatology, Vanderbilt University Medical Center, Nashville, TN,
USA
- Dermatology Service and Research Service, Tennessee Valley
Healthcare System, Department of Veterans Affairs, Nashville, TN, USA
- Vanderbilt-Ingram Cancer Center, Nashville, TN, USA
- Department of Biomedical Engineering, Vanderbilt
University, Nashville, TN, USA
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9
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Lal C, Alexandrov S, Rani S, Zhou Y, Ritter T, Leahy M. Nanosensitive optical coherence tomography to assess wound healing within the cornea. BIOMEDICAL OPTICS EXPRESS 2020; 11:3407-3422. [PMID: 33014541 PMCID: PMC7510923 DOI: 10.1364/boe.389342] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Revised: 04/19/2020] [Accepted: 04/19/2020] [Indexed: 05/13/2023]
Abstract
Optical coherence tomography (OCT) is a non-invasive depth resolved optical imaging modality, that enables high resolution, cross-sectional imaging in biological tissues and materials at clinically relevant depths. Though OCT offers high resolution imaging, the best ultra-high-resolution OCT systems are limited to imaging structural changes with a resolution of one micron on a single B-scan within very limited depth. Nanosensitive OCT (nsOCT) is a recently developed technique that is capable of providing enhanced sensitivity of OCT to structural changes. Improving the sensitivity of OCT to detect structural changes at the nanoscale level, to a depth typical for conventional OCT, could potentially improve the diagnostic capability of OCT in medical applications. In this paper, we demonstrate the capability of nsOCT to detect structural changes deep in the rat cornea following superficial corneal injury.
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Affiliation(s)
- Cerine Lal
- Tissue Optics and Microcirculation Imaging Facility, National Biophotonics and Imaging Platform, School of Physics, National University of Ireland, Galway, Ireland
| | - Sergey Alexandrov
- Tissue Optics and Microcirculation Imaging Facility, National Biophotonics and Imaging Platform, School of Physics, National University of Ireland, Galway, Ireland
| | - Sweta Rani
- Regenerative Medicine Institute, National University of Ireland, Galway, Ireland
| | - Yi Zhou
- Tissue Optics and Microcirculation Imaging Facility, National Biophotonics and Imaging Platform, School of Physics, National University of Ireland, Galway, Ireland
| | - Thomas Ritter
- Regenerative Medicine Institute, National University of Ireland, Galway, Ireland
| | - Martin Leahy
- Tissue Optics and Microcirculation Imaging Facility, National Biophotonics and Imaging Platform, School of Physics, National University of Ireland, Galway, Ireland
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10
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Bruins AA, Geboers DGPJ, Bauer JR, Klaessens JHGM, Verdaasdonk RM, Boer C. The vascular occlusion test using multispectral imaging: a validation study : The VASOIMAGE study. J Clin Monit Comput 2020; 35:113-121. [PMID: 31902095 DOI: 10.1007/s10877-019-00448-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Accepted: 12/14/2019] [Indexed: 12/11/2022]
Abstract
Multispectral imaging (MSI) is a new, non-invasive method to continuously measure oxygenation and microcirculatory perfusion, but has limitedly been validated in healthy volunteers. The present study aimed to validate the potential of multispectral imaging in the detection of microcirculatory perfusion disturbances during a vascular occlusion test (VOT). Two consecutive VOT's were performed on healthy volunteers and tissue oxygenation was measured with MSI and near-infrared spectroscopy (NIRS). Correlations between the rate of desaturation, recovery and the hyperemic area under the curve (AUC) measured by MSI and NIRS were calculated. Fifty-eight volunteers were included. The MSI oxygenation curves showed identifiable components of the VOT, including a desaturation and recovery slope and hyperemic area under the curve, similar to those measured with NIRS. The correlation between the rate of desaturation measured by MSI and NIRS was moderate: r = 0.42 (p = 0.001) for the first and r = 0.41 (p = 0.002) for the second test. Our results suggest that non-contact multispectral imaging is able to measure changes in regional oxygenation and deoxygenation during a vascular occlusion test in healthy volunteers. When compared to measurements with NIRS, correlation of results was moderate to weak, most likely reflecting differences in physiology of the regions of interest and measurement technique.
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Affiliation(s)
- Arnoud A Bruins
- Departments of Anesthesiology, Amsterdam UMC, VU University, location VUmc, De Boelelaan 1117, 1081 HV, Amsterdam, The Netherlands. .,Amsterdam Cardiovascular Sciences, De Boelelaan 1117, 1081 HV, Amsterdam, The Netherlands.
| | - Diederik G P J Geboers
- Departments of Anesthesiology, Amsterdam UMC, VU University, location VUmc, De Boelelaan 1117, 1081 HV, Amsterdam, The Netherlands.,Amsterdam Cardiovascular Sciences, De Boelelaan 1117, 1081 HV, Amsterdam, The Netherlands
| | - Jacob R Bauer
- The Norwegian Colour and Visual Computing Laboratory, Norwegian University of Science and Technology (NTNU), Gjøvik, Norway
| | - John H G M Klaessens
- Department of Clinical Physics, Medical Center Leeuwarden, Leeuwarden, The Netherlands
| | - Rudolf M Verdaasdonk
- TechMed Center, BioMedical Photonics & Medical Imaging, University of Twente, Enschede, The Netherlands
| | - Christa Boer
- Departments of Anesthesiology, Amsterdam UMC, VU University, location VUmc, De Boelelaan 1117, 1081 HV, Amsterdam, The Netherlands.,Amsterdam Cardiovascular Sciences, De Boelelaan 1117, 1081 HV, Amsterdam, The Netherlands
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11
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Margaryants NB, Sidorov IS, Volkov MV, Gurov IP, Mamontov OV, Kamshilin AA. Visualization of skin capillaries with moving red blood cells in arbitrary area of the body. BIOMEDICAL OPTICS EXPRESS 2019; 10:4896-4906. [PMID: 31565533 PMCID: PMC6757459 DOI: 10.1364/boe.10.004896] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Revised: 08/18/2019] [Accepted: 08/22/2019] [Indexed: 05/27/2023]
Abstract
Evaluation of skin microcirculation allows for the assessment of functional states for neuroendocrine and endothelial regulation. We present a novel method to visualize skin microvessels in any area of the body, which is in contrast to classical capillaroscopy, in which the application areas are limited to the nailfold and retina capillaries. The technique is based on microscopic video-image analysis. It exploits a specific feature of irregularity of red-blood-cells motion. Feasibility of the method is demonstrated by mapping the skin capillaries in the forearm and face of 11 healthy volunteers. The proposed method is promising for the quantitative assessment of cutaneous microcirculation in a wide range of diseases and functional states.
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Affiliation(s)
- Nikita B. Margaryants
- Faculty of Applied Optics, ITMO University, 49 Kronverksky pr., 197101, St. Petersburg, Russia
| | - Igor S. Sidorov
- Faculty of Applied Optics, ITMO University, 49 Kronverksky pr., 197101, St. Petersburg, Russia
| | - Mikhail V. Volkov
- Faculty of Applied Optics, ITMO University, 49 Kronverksky pr., 197101, St. Petersburg, Russia
| | - Igor P. Gurov
- Faculty of Applied Optics, ITMO University, 49 Kronverksky pr., 197101, St. Petersburg, Russia
| | - Oleg V. Mamontov
- Faculty of Applied Optics, ITMO University, 49 Kronverksky pr., 197101, St. Petersburg, Russia
- Department of Circulation Physiology, Almazov National Medical Research Center, 2 Akkuratova st., 197341, St. Petersburg, Russia
| | - Alexei A. Kamshilin
- Faculty of Applied Optics, ITMO University, 49 Kronverksky pr., 197101, St. Petersburg, Russia
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Revzin MV, Imanzadeh A, Menias C, Pourjabbar S, Mustafa A, Nezami N, Spektor M, Pellerito JS. Optimizing Image Quality When Evaluating Blood Flow at Doppler US: A Tutorial. Radiographics 2019; 39:1501-1523. [PMID: 31398088 DOI: 10.1148/rg.2019180055] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Doppler US is an essential component of nearly all diagnostic US procedures. In this era of increased awareness of the effects of ionizing radiation and the side effects of iodine- and gadolinium-based contrast agents, Doppler US is poised to play an even bigger role in medical imaging. It is safe, cost-effective, portable, and highly accurate when performed by an experienced operator. The sensitivities and specificities of Doppler US for detecting blood flow and determining the direction and velocity of blood flow in various organs and vascular systems have increased dramatically in the past decade. With use of advanced flow techniques that are available for use with most modern equipment, US can provide vascular information that is comparable to or even more accurate than that obtained with other cross-sectional and interventional modalities. However, there remains concern that US (including newer more advanced flow-evaluating techniques) will not be used to its full potential owing to dependence on operator skill and expertise. Thorough understanding of image optimization techniques and expanded knowledge of the physical principles, instrumentation, application, advantages, and limitations of this modality are of utmost importance. The authors provide a simple practical guide for optimizing images for vascular flow detection by reviewing various cases and focusing on the parameters that should be optimized. Online supplemental material is available for this article. ©RSNA, 2019 See discussion on this article by Pellerito.
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Affiliation(s)
- Margarita V Revzin
- From the Department of Diagnostic Radiology and Biomedical Imaging, Yale University School of Medicine, 333 Cedar St, PO Box 208042, Room TE-2, New Haven, CT 06520 (M.V.R., A.I., S.P., A.M., N.N., M.S.); Department of Radiology, Mayo Clinic Arizona, Phoenix, Ariz (C.M.); and Department of Radiology, Zucker School of Medicine at Hofstra/Northwell, Northwell Health System, Manhasset, NY (J.S.P.)
| | - Amir Imanzadeh
- From the Department of Diagnostic Radiology and Biomedical Imaging, Yale University School of Medicine, 333 Cedar St, PO Box 208042, Room TE-2, New Haven, CT 06520 (M.V.R., A.I., S.P., A.M., N.N., M.S.); Department of Radiology, Mayo Clinic Arizona, Phoenix, Ariz (C.M.); and Department of Radiology, Zucker School of Medicine at Hofstra/Northwell, Northwell Health System, Manhasset, NY (J.S.P.)
| | - Christine Menias
- From the Department of Diagnostic Radiology and Biomedical Imaging, Yale University School of Medicine, 333 Cedar St, PO Box 208042, Room TE-2, New Haven, CT 06520 (M.V.R., A.I., S.P., A.M., N.N., M.S.); Department of Radiology, Mayo Clinic Arizona, Phoenix, Ariz (C.M.); and Department of Radiology, Zucker School of Medicine at Hofstra/Northwell, Northwell Health System, Manhasset, NY (J.S.P.)
| | - Sarvenaz Pourjabbar
- From the Department of Diagnostic Radiology and Biomedical Imaging, Yale University School of Medicine, 333 Cedar St, PO Box 208042, Room TE-2, New Haven, CT 06520 (M.V.R., A.I., S.P., A.M., N.N., M.S.); Department of Radiology, Mayo Clinic Arizona, Phoenix, Ariz (C.M.); and Department of Radiology, Zucker School of Medicine at Hofstra/Northwell, Northwell Health System, Manhasset, NY (J.S.P.)
| | - Adel Mustafa
- From the Department of Diagnostic Radiology and Biomedical Imaging, Yale University School of Medicine, 333 Cedar St, PO Box 208042, Room TE-2, New Haven, CT 06520 (M.V.R., A.I., S.P., A.M., N.N., M.S.); Department of Radiology, Mayo Clinic Arizona, Phoenix, Ariz (C.M.); and Department of Radiology, Zucker School of Medicine at Hofstra/Northwell, Northwell Health System, Manhasset, NY (J.S.P.)
| | - Nariman Nezami
- From the Department of Diagnostic Radiology and Biomedical Imaging, Yale University School of Medicine, 333 Cedar St, PO Box 208042, Room TE-2, New Haven, CT 06520 (M.V.R., A.I., S.P., A.M., N.N., M.S.); Department of Radiology, Mayo Clinic Arizona, Phoenix, Ariz (C.M.); and Department of Radiology, Zucker School of Medicine at Hofstra/Northwell, Northwell Health System, Manhasset, NY (J.S.P.)
| | - Michael Spektor
- From the Department of Diagnostic Radiology and Biomedical Imaging, Yale University School of Medicine, 333 Cedar St, PO Box 208042, Room TE-2, New Haven, CT 06520 (M.V.R., A.I., S.P., A.M., N.N., M.S.); Department of Radiology, Mayo Clinic Arizona, Phoenix, Ariz (C.M.); and Department of Radiology, Zucker School of Medicine at Hofstra/Northwell, Northwell Health System, Manhasset, NY (J.S.P.)
| | - John S Pellerito
- From the Department of Diagnostic Radiology and Biomedical Imaging, Yale University School of Medicine, 333 Cedar St, PO Box 208042, Room TE-2, New Haven, CT 06520 (M.V.R., A.I., S.P., A.M., N.N., M.S.); Department of Radiology, Mayo Clinic Arizona, Phoenix, Ariz (C.M.); and Department of Radiology, Zucker School of Medicine at Hofstra/Northwell, Northwell Health System, Manhasset, NY (J.S.P.)
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Motabbakani N, Lehmann C. Laser Doppler-based measurements of periarticular blood flux can be utilized for assessment of arthritis pain: A hypothesis. Clin Hemorheol Microcirc 2019; 71:171-174. [DOI: 10.3233/ch-189408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
| | - Christian Lehmann
- Department of Pharmacology, Dalhousie University Halifax, Canada
- Department of Anesthesia, Dalhousie University Halifax, Canada
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Lal C, Subhash HM, Alexandrov S, Leahy MJ. Feasibility of correlation mapping optical coherence tomography angiographic technique using a 200 kHz vertical-cavity surface-emitting laser source for in vivo microcirculation imaging applications. APPLIED OPTICS 2018; 57:E224-E231. [PMID: 30117906 DOI: 10.1364/ao.57.00e224] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 07/04/2018] [Indexed: 05/19/2023]
Abstract
Optical coherence tomography (OCT) angiography is a well-established in vivo imaging technique to assess the overall vascular morphology of tissues and is an emerging field of research for the assessment of blood flow dynamics and functional parameters such as oxygen saturation. In this study, we present a modified scanning-based correlation mapping OCT using a 200 kHz high-speed swept-source OCT system operating at 1300 nm and demonstrate its wide field-imaging capability in ocular angiographic studies.
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Zafar H, Leahy M, Wijns W, Kolios M, Zafar J, Johnson N, Sharif F. Photoacoustic cardiovascular imaging: a new technique for imaging of atherosclerosis and vulnerable plaque detection. Biomed Phys Eng Express 2018. [DOI: 10.1088/2057-1976/aab640] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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Murray A, Dinsdale G. Imaging the Microcirculation. Microcirculation 2018; 23:335-6. [PMID: 27096601 DOI: 10.1111/micc.12282] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2016] [Accepted: 04/18/2016] [Indexed: 11/30/2022]
Abstract
This special issue includes the abstracts from, and three reviews by invited speakers at, the British Microcirculation Society's Annual Meeting in 2015. The reviews cover topics from the meeting symposium of "Imaging the Microcirculation" and discuss noninvasive methods of visualizing and measuring the microvasculature's structure and function.
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Affiliation(s)
- Andrea Murray
- Centre for Musculoskeletal Research, Institute of Inflammation and Repair, Manchester Academic Health Science Centre, Salford Royal NHS Foundation Trust, The University of Manchester, Manchester, United Kingdom.,Photon Science Institute, University of Manchester, Manchester, United Kingdom
| | - Graham Dinsdale
- Centre for Musculoskeletal Research, Institute of Inflammation and Repair, Manchester Academic Health Science Centre, Salford Royal NHS Foundation Trust, The University of Manchester, Manchester, United Kingdom
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Tykocki NR, Boerman EM, Jackson WF. Smooth Muscle Ion Channels and Regulation of Vascular Tone in Resistance Arteries and Arterioles. Compr Physiol 2017; 7:485-581. [PMID: 28333380 DOI: 10.1002/cphy.c160011] [Citation(s) in RCA: 222] [Impact Index Per Article: 31.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Vascular tone of resistance arteries and arterioles determines peripheral vascular resistance, contributing to the regulation of blood pressure and blood flow to, and within the body's tissues and organs. Ion channels in the plasma membrane and endoplasmic reticulum of vascular smooth muscle cells (SMCs) in these blood vessels importantly contribute to the regulation of intracellular Ca2+ concentration, the primary determinant of SMC contractile activity and vascular tone. Ion channels provide the main source of activator Ca2+ that determines vascular tone, and strongly contribute to setting and regulating membrane potential, which, in turn, regulates the open-state-probability of voltage gated Ca2+ channels (VGCCs), the primary source of Ca2+ in resistance artery and arteriolar SMCs. Ion channel function is also modulated by vasoconstrictors and vasodilators, contributing to all aspects of the regulation of vascular tone. This review will focus on the physiology of VGCCs, voltage-gated K+ (KV) channels, large-conductance Ca2+-activated K+ (BKCa) channels, strong-inward-rectifier K+ (KIR) channels, ATP-sensitive K+ (KATP) channels, ryanodine receptors (RyRs), inositol 1,4,5-trisphosphate receptors (IP3Rs), and a variety of transient receptor potential (TRP) channels that contribute to pressure-induced myogenic tone in resistance arteries and arterioles, the modulation of the function of these ion channels by vasoconstrictors and vasodilators, their role in the functional regulation of tissue blood flow and their dysfunction in diseases such as hypertension, obesity, and diabetes. © 2017 American Physiological Society. Compr Physiol 7:485-581, 2017.
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Affiliation(s)
- Nathan R Tykocki
- Department of Pharmacology, University of Vermont, Burlington, Vermont, USA
| | - Erika M Boerman
- Department of Medical Pharmacology and Physiology, University of Missouri, Columbia, Missouri, USA
| | - William F Jackson
- Department of Pharmacology and Toxicology, Michigan State University, East Lansing, Michigan, USA
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