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Kim Y, Choi WJ, Oh J, Lee K, Kim JK. Smartphone-Based Rigid Endoscopy Device with Hemodynamic Response Imaging and Laser Speckle Contrast Imaging. BIOSENSORS 2023; 13:816. [PMID: 37622902 PMCID: PMC10452712 DOI: 10.3390/bios13080816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Revised: 08/11/2023] [Accepted: 08/13/2023] [Indexed: 08/26/2023]
Abstract
Modern smartphones have been employed as key elements in point-of-care (POC) devices due to remarkable advances in their form factor, computing, and display performances. Recently, we reported a combination of the smartphone with a handheld endoscope using laser speckle contrast imaging (LSCI), suggesting potential for functional POC endoscopy. Here, we extended our work to develop a smartphone-combined multifunctional handheld endoscope using dual-wavelength LSCI. Dual-wavelength LSCI is used to monitor the changes in dynamic blood flow as well as changes in the concentration of oxygenated (HbO2), deoxygenated (Hbr), and total hemoglobin (HbT). The smartphone in the device performs fast acquisition and computation of the raw LSCI data to map the blood perfusion parameters. The flow imaging performance of the proposed device was tested with a tissue-like flow phantom, exhibiting a speckle flow index map representing the blood perfusion. Furthermore, the device was employed to assess the blood perfusion status from an exteriorized intestine model of rat in vivo during and after local ischemia, showing that blood flow and HbO2 gradually decreased in the ischemic region whereas hyperemia and excess increases in HbO2 were observed in the same region right after reperfusion. The results indicate that the combination of LSCI with smartphone endoscopy delivers a valuable platform for better understanding of the functional hemodynamic changes in the vasculatures of the internal organs, which may benefit POC testing for diagnosis and treatment of vascular diseases.
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Affiliation(s)
- Youngkyu Kim
- Biomedical Engineering Research Center, Asan Medical Center, Seoul 05505, Republic of Korea;
| | - Woo June Choi
- School of Electrical and Electronics Engineering, Chung-Ang University, Seoul 06974, Republic of Korea;
| | - Jeongmin Oh
- Department of Biomedical Engineering, College of Medicine, University of Ulsan, Seoul 05505, Republic of Korea; (J.O.); (K.L.)
| | - Kwanhee Lee
- Department of Biomedical Engineering, College of Medicine, University of Ulsan, Seoul 05505, Republic of Korea; (J.O.); (K.L.)
| | - Jun Ki Kim
- Biomedical Engineering Research Center, Asan Medical Center, Seoul 05505, Republic of Korea;
- Department of Biomedical Engineering, College of Medicine, University of Ulsan, Seoul 05505, Republic of Korea; (J.O.); (K.L.)
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Li W, You H, Zhang Y, Zhang H, Li C. 2D perfusion angiography: an alternative method to evaluate endovascular intervention for acute lower limb ischemia. BMC Cardiovasc Disord 2022; 22:522. [PMID: 36463099 PMCID: PMC9719174 DOI: 10.1186/s12872-022-02979-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Accepted: 11/25/2022] [Indexed: 12/05/2022] Open
Abstract
BACKGROUND Despite advances in endovascular techniques to treat acute limb ischemia (ALI), evaluation of clinical outcomes for revascularization remains challenging, especially the accurate quantification of post-endovascular limb perfusion. This study aimed to investigate the accuracy and value of 2D perfusion angiography to evaluate endovascular intervention for ALI. METHODS A total of 47 patients with ALI were retrospectively analyzed. The transcutaneous oxygen partial pressure (TcPO2) was obtained using laser Doppler blood perfusion monitoring. The ankle-brachial index (ABI) and angiographic images were obtained before and after endovascular intervention. iFlow imaging was used to obtain color-coded images. Regions of interest (ROIs) at the femoral head, knee joint, and ankle joint were selected to obtain the time to peak (TTP). The differences in the TTP between the knee and femoral head regions (TTP difference in the knee area) and between the ankle and knee regions (TTP difference in the ankle area) were observed. The TTP, ABI, and TcPO2 between the complete response (CR), partial response (PR), no response (NR), and amputation (AM) groups were compared. The correlation between TTP changes in the ankle area (ΔTTP) and changes in ABI (ΔABI)/changes in TcPO2 (ΔTcPO2) was analyzed. RESULTS There was a significant increase in both TcPO2 and ABI compared with the pre-intervention values (27.75 ± 5.32 vs 40.92 ± 4.62, and 0.35 ± 0.16 vs 0.79 ± 0.15, respectively, all p < 0.01). The post-intervention TTP differences in the knee areas (5.12 ± 2.45 s) and ankle areas (6.93 ± 4.37 s) were significantly faster than pre-intervention TTP differences (7.03 ± 2.57 s and 10.66 ± 4.07 s, respectively, all p < 0.05). The post-operative TTP in the ankle area, post-operative TTP difference in the ankle area, and ΔTTP in the AM group were higher than the values in the CR and PR groups. The ΔTTP demonstrated strong correlation with ΔABI (r = -0.722, p < 0.01) and ΔTcPO2 (r = -0.734, p < 0.01). CONCLUSIONS 2D perfusion angiography with enhanced visual and quantitative analysis exhibits great potential to evaluate the efficacy of endovascular intervention, and provides a quantitative and sensitive tool to evaluate post-endovascular limb perfusion for ALI patients.
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Affiliation(s)
- Wanghai Li
- grid.412601.00000 0004 1760 3828Department of Interventional Radiology and Vascular Surgery, The First Affiliated Hospital of Jinan University, No. 613 West Huangpu Avenue, Guangzhou, 510630 China
| | - Huimin You
- grid.410737.60000 0000 8653 1072Department of Endocrinology, The Fifth Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510700 China
| | - Yan Zhang
- grid.412601.00000 0004 1760 3828Department of Interventional Radiology and Vascular Surgery, The First Affiliated Hospital of Jinan University, No. 613 West Huangpu Avenue, Guangzhou, 510630 China
| | - Hong Zhang
- grid.412601.00000 0004 1760 3828Department of Interventional Radiology and Vascular Surgery, The First Affiliated Hospital of Jinan University, No. 613 West Huangpu Avenue, Guangzhou, 510630 China
| | - Chengzhi Li
- grid.412601.00000 0004 1760 3828Department of Interventional Radiology and Vascular Surgery, The First Affiliated Hospital of Jinan University, No. 613 West Huangpu Avenue, Guangzhou, 510630 China
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Development of a Non-Invasive Local Heating Load Test to Detect Severe Limb Ischemia Within 200 seconds. Vasc Endovascular Surg 2022; 57:19-25. [DOI: 10.1177/15385744221120977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Purpose To establish a non-invasive test method for the rapid detection of severe ischemia (SI) in the limbs in patients with peripheral arterial disease (PAD). Methods Between November 2019 and May 2021, 22 patients admitted for PAD to 2 hospitals agreed to participate in the study. All patients underwent a local heating load (LHL) test. SI was defined as at least 1 ankle-brachial index value of <.4 and/or transcutaneous oximetry value of <30 mmHg. The other cases were classified as mild-to-moderate ischemia (MMI). The LHL test was performed simultaneously with 15 minutes of heating and measurement by attaching a blood flow meter measuring probe combined with a warmer to the patient’s dorsal foot. Evaluation consisted of 200-s periods from the start of heating to 800 seconds. For each period, perfusion value (PV) was evaluated, and slope was calculated graphically based on linear regression as PV fluctuation per minute. Test accuracy was calculated using a receiver operating characteristic curve. Results Twenty-four limbs of 18 patients were finally evaluated; 4 patients (2 with missing data, 1 with collagen disease, and 1 with embolism) were excluded, with 13 and 11 limbs in the SI and MMI groups, respectively. The SI group showed a significantly lower slope value in the first 200 seconds and lower PV at 200 seconds and thereafter. From the slope value, it was possible to detect SI with 85% sensitivity and 73% specificity at 200 seconds. PV could be determined with higher accuracy in periods after 200 seconds, with 85% sensitivity and 82% specificity at 800 seconds. Conclusions Our non-invasive LHL test could be used as a rapid screening test to detect SI in limbs within 200 seconds, as well as a more accurate test to detect ischemia within 800 seconds.
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Hultman M, Aronsson S, Fredriksson I, Zachrisson H, Pärsson H, Larsson M, Strömberg T. Comprehensive imaging of microcirculatory changes in the foot during endovascular intervention - A technical feasibility study. Microvasc Res 2022; 141:104317. [PMID: 35016873 DOI: 10.1016/j.mvr.2022.104317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 12/17/2021] [Accepted: 01/03/2022] [Indexed: 10/19/2022]
Abstract
Chronic limb-threatening ischemia (CLTI) has a major impact on patient's lives and is associated with a heavy health care burden with high morbidity and mortality. Treatment by endovascular intervention is mostly based on macrocirculatory information from angiography and does not consider the microcirculation. Despite successful endovascular intervention according to angiographic criteria, a proportion of patients fail to heal ischemic lesions. This might be due to impaired microvascular perfusion and variations in the supply to different angiosomes. Non-invasive optical techniques for microcirculatory perfusion and oxygen saturation imaging have the potential to provide the interventionist with additional information in real-time, supporting clinical decisions during the intervention. This study presents a novel multimodal imaging system, based on multi-exposure laser speckle contrast imaging and multi-spectral imaging, for continuous use during endovascular intervention. The results during intervention display spatiotemporal changes in the microcirculation compatible with expected physiological reactions during balloon dilation, with initially induced ischemia followed by a restored perfusion, and local administration of a vasodilator inducing hyperemia. We also present perioperative and postoperative follow-up measurements with a pulsatile microcirculation perfusion. Finally, cases of spatial heterogeneity in the observed oxygen saturation and perfusion are discussed. In conclusion, this technical feasibility study shows the potential of the methodology to characterize changes in microcirculation before, during, and after endovascular intervention.
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Affiliation(s)
- Martin Hultman
- Department of Biomedical Engineering, Linköping University, Linköping, Sweden.
| | - Sofie Aronsson
- Department of Health, Medicine, and Caring Sciences, Division of Diagnostics and Specialist Medicine, Linköping University Hospital, Linköping, Sweden
| | - Ingemar Fredriksson
- Department of Biomedical Engineering, Linköping University, Linköping, Sweden; Perimed AB, Datavägen 9A, Järfälla, Stockholm, Sweden
| | - Helene Zachrisson
- Department of Health, Medicine, and Caring Sciences, Division of Diagnostics and Specialist Medicine, Linköping University Hospital, Linköping, Sweden
| | - Håkan Pärsson
- Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
| | - Marcus Larsson
- Department of Biomedical Engineering, Linköping University, Linköping, Sweden
| | - Tomas Strömberg
- Department of Biomedical Engineering, Linköping University, Linköping, Sweden
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Karlas A, Masthoff M, Kallmayer M, Helfen A, Bariotakis M, Fasoula NA, Schäfers M, Seidensticker M, Eckstein HH, Ntziachristos V, Wildgruber M. Multispectral optoacoustic tomography of peripheral arterial disease based on muscle hemoglobin gradients-a pilot clinical study. ANNALS OF TRANSLATIONAL MEDICINE 2021; 9:36. [PMID: 33553329 PMCID: PMC7859778 DOI: 10.21037/atm-20-3321] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Accepted: 09/18/2020] [Indexed: 12/18/2022]
Abstract
BACKGROUND Current imaging assessment of peripheral artery disease (PAD) relies on anatomical cross-sectional visualizations of the affected arteries. Multispectral optoacoustic tomography (MSOT) is a novel molecular imaging technique that provides direct and label-free visualizations of soft tissue perfusion and oxygenation. METHODS MSOT was prospectively assessed in a pilot trial in healthy volunteers (group n1=4, mean age 31, 50% male and group n3=4, mean age 37.3, 75% male) and patients with intermittent claudication (group n2=4, mean age 72, 75% male, PAD stage IIb). We conducted cuff-induced ischemia (group n1) and resting state measurements (groups n2 and n3) over the calf region. Spatially resolved mapping of oxygenated (HbO2), deoxygenated (Hb) and total (THb) hemoglobin, as well as oxygen saturation (SO2), were measured via hand-held hybrid MSOT-Ultrasound based purely on hemoglobin contrast. RESULTS Calf measurements in healthy volunteers revealed distinct dynamics for HbO2, Hb, THb and SO2 under cuff-induced ischemia. HbO2, THb and SO2 levels were significantly impaired in PAD patients compared to healthy volunteers (P<0.05 for all parameters). Revascularization led to significant improvements in HbO2 of the affected limb. CONCLUSIONS Clinical MSOT allows for non-invasive, label-free and real-time imaging of muscle oxygenation in health and disease with implications for diagnostics and therapy assessment in PAD.
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Affiliation(s)
- Angelos Karlas
- Chair of Biological Imaging, School of Medicine, Technical University of Munich, Munich, Germany
- Institute of Biological and Medical Imaging, Helmholtz Zentrum München (GmbH), Neuherberg, Germany
- Clinic of Vascular and Endovascular Surgery, Technical University of Munich, Klinikum rechts der Isar, Munich, Germany
- DZHK (German Centre for Cardiovascular Research), partner site Munich Heart Alliance, Munich, Germany
| | - Max Masthoff
- Department for Clinical Radiology, University Hospital Münster, Münster, Germany
| | - Michael Kallmayer
- Clinic of Vascular and Endovascular Surgery, Technical University of Munich, Klinikum rechts der Isar, Munich, Germany
| | - Anne Helfen
- Department for Clinical Radiology, University Hospital Münster, Münster, Germany
| | - Michail Bariotakis
- Chair of Biological Imaging, School of Medicine, Technical University of Munich, Munich, Germany
- Institute of Biological and Medical Imaging, Helmholtz Zentrum München (GmbH), Neuherberg, Germany
| | - Nikolina Alexia Fasoula
- Chair of Biological Imaging, School of Medicine, Technical University of Munich, Munich, Germany
- Institute of Biological and Medical Imaging, Helmholtz Zentrum München (GmbH), Neuherberg, Germany
| | - Michael Schäfers
- Department for Nuclear Medicine and European Institute for Molecular Imaging, University Hospital Münster, Münster, Germany
| | - Max Seidensticker
- Department for Radiology, University Hospital, LMU Munich, München, Germany
| | - Hans-Henning Eckstein
- Clinic of Vascular and Endovascular Surgery, Technical University of Munich, Klinikum rechts der Isar, Munich, Germany
- DZHK (German Centre for Cardiovascular Research), partner site Munich Heart Alliance, Munich, Germany
| | - Vasilis Ntziachristos
- Chair of Biological Imaging, School of Medicine, Technical University of Munich, Munich, Germany
- Institute of Biological and Medical Imaging, Helmholtz Zentrum München (GmbH), Neuherberg, Germany
- DZHK (German Centre for Cardiovascular Research), partner site Munich Heart Alliance, Munich, Germany
| | - Moritz Wildgruber
- Department for Clinical Radiology, University Hospital Münster, Münster, Germany
- Department for Radiology, University Hospital, LMU Munich, München, Germany
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Hultman M, Larsson M, Strömberg T, Fredriksson I. Real-time video-rate perfusion imaging using multi-exposure laser speckle contrast imaging and machine learning. JOURNAL OF BIOMEDICAL OPTICS 2020; 25:JBO-200207R. [PMID: 33191685 PMCID: PMC7666876 DOI: 10.1117/1.jbo.25.11.116007] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Accepted: 10/21/2020] [Indexed: 05/03/2023]
Abstract
SIGNIFICANCE Multi-exposure laser speckle contrast imaging (MELSCI) estimates microcirculatory blood perfusion more accurately than single-exposure LSCI. However, the technique has been hampered by technical limitations due to massive data throughput requirements and nonlinear inverse search algorithms, limiting it to an offline technique where data must be postprocessed. AIM To present an MELSCI system capable of continuous acquisition and processing of MELSCI data, enabling real-time video-rate perfusion imaging with high accuracy. APPROACH The MELSCI algorithm was implemented in programmable hardware (field programmable gate array) closely interfaced to a high-speed CMOS sensor for real-time calculation. Perfusion images were estimated in real-time from the MELSCI data using an artificial neural network trained on simulated data. The MELSCI perfusion was compared to two existing single-exposure metrics both quantitatively in a controlled phantom experiment and qualitatively in vivo. RESULTS The MELSCI perfusion shows higher signal dynamics compared to both single-exposure metrics, both spatially and temporally where heartbeat-related variations are resolved in much greater detail. The MELSCI perfusion is less susceptible to measurement noise and is more linear with respect to laser Doppler perfusion in the phantom experiment (R2 = 0.992). CONCLUSIONS The presented MELSCI system allows for real-time acquisition and calculation of high-quality perfusion at 15.6 frames per second.
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Affiliation(s)
- Martin Hultman
- Linköping University, Department of Biomedical Engineering, Linköping, Sweden
- Address all correspondence to Martin Hultman,
| | - Marcus Larsson
- Linköping University, Department of Biomedical Engineering, Linköping, Sweden
| | - Tomas Strömberg
- Linköping University, Department of Biomedical Engineering, Linköping, Sweden
| | - Ingemar Fredriksson
- Linköping University, Department of Biomedical Engineering, Linköping, Sweden
- Perimed AB, Järfälla, Stockholm, Sweden
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Kagadis GC, Tsantis S, Gatos I, Spiliopoulos S, Katsanos K, Karnabatidis D. 2D perfusion DSA with an open-source, semi-automated, color-coded software for the quantification of foot perfusion following infrapopliteal angioplasty: a feasibility study. Eur Radiol Exp 2020; 4:47. [PMID: 32875390 PMCID: PMC7462946 DOI: 10.1186/s41747-020-00176-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Accepted: 07/03/2020] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND Foot perfusion has been recently implemented as a new tool for optimizing outcomes of peripheral endovascular procedures. A custom-made, two-dimensional perfusion digital subtraction angiography (PDSA) algorithm has been implemented to quantify outcomes of endovascular treatment of critical limb ischemia (CLI), assist intra-procedural decision-making, and enhance clinical outcomes. METHODS The study was approved by the Hospital's Ethics Committee. This prospective, single-center study included seven consecutive patients scheduled to undergo infrapopliteal endovascular treatment of CLI. Perfusion blood volume (PBV), mean transit time (MTT), and perfusion blood flow (PBF) maps were extracted by analyzing time-intensity curves and signal intensity on the perfused vessel mask. Mean values calculated from user-specified regions of interest (ROIs) on perfusion maps were employed to evaluate pre- and post-endovascular treatment condition. Measurements were performed immediately after final PDSA. RESULTS In total, five patients (aged 54 ± 16 years, mean ± standard deviation) were analyzed, as two patients were excluded due to significant motion artifacts. Post-procedural MTT presented a mean decrease of 19.1% for all patients and increased only in 1 of 5 patients, demonstrating in 4/5 patients an increase in tissue perfusion after revascularization. Overall mean PBF and PBV values were also analogously increased following revascularization (446% and 69.5% mean, respectively) and in the majority of selected ROIs (13/15 and 12/15 ROIs, respectively). CONCLUSIONS Quantification of infrapopliteal angioplasty outcomes using this newly proposed, custom-made, intra-procedural PDSA algorithm was performed using PBV, MTT, and PBF maps. Further studies are required to determine its role in peripheral endovascular procedures ( ClinicalTrials.gov Identifier: NCT04356092).
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Affiliation(s)
- George C Kagadis
- Department of Medical Physics, School of Medicine, University of Patras, GR 26504, Rion, Greece
- Department of Imaging Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA
| | - Stavros Tsantis
- Department of Medical Physics, School of Medicine, University of Patras, GR 26504, Rion, Greece
| | - Ilias Gatos
- Department of Medical Physics, School of Medicine, University of Patras, GR 26504, Rion, Greece
| | - Stavros Spiliopoulos
- 2nd Department of Radiology, School of Medicine, "ATTIKON" University Hospital, National and Kapodistrian University of Athens, GR 12461, Athens, Greece.
| | - Konstantinos Katsanos
- Department of Radiology, School of Medicine, University of Patras, GR 26504, Rion, Greece
| | - Dimitris Karnabatidis
- Department of Radiology, School of Medicine, University of Patras, GR 26504, Rion, Greece
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Leenstra B, Wijnand J, Verhoeven B, Koning O, Teraa M, Verhaar MC, de Borst GJ. Applicability of Transcutaneous Oxygen Tension Measurement in the Assessment of Chronic Limb-Threatening Ischemia. Angiology 2020; 71:208-216. [PMID: 31387360 PMCID: PMC6987479 DOI: 10.1177/0003319719866958] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Transcutaneous oxygen tension measurement (TcPO2) is widely applied for the evaluation of chronic limb-threatening ischemia (CLTI). Nevertheless, studies that focused on the clinical value of TcPO2 have shown varying results. We identified factors that potentially play a role in TcPO2 measurement variation such as probe placement, probe temperature, and the use of a reference probe. In this review of the current literature, we assessed the application of these factors. A systematic search was conducted. Parameters that were assessed were probe placement, probe temperature, and mentioning and/or use of a reference probe. In total, 36 articles were eligible for analysis. In 24 (67%) studies, probes were placed on specific anatomical locations. Seven (19%) studies placed probes, regardless of the location of the ulcer, adjacent to an ischemic lesion or ulcer (perilesion). Selected temperature setting of the probe differed; in 18 (50%), a default probe temperature of 44°C was selected, and in 13 (36%), a different temperature was selected. In 31 (84%) studies, the use of a reference probe was not reported. Transcutaneous oxygen tension measurement is applied diversely in patients with CLTI. Homogeneity in TcPO2 protocols is warranted for reliable clinical application and to compare future TcPO2 research.
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Affiliation(s)
- Bernard Leenstra
- Department of Vascular Surgery, UMC Utrecht, CX Utrecht, the
Netherlands
| | - Joep Wijnand
- Department of Vascular Surgery, UMC Utrecht, CX Utrecht, the
Netherlands
| | - Bart Verhoeven
- Department of Vascular Surgery, Jeroen Bosch Ziekenhuis, Henri Dunantstraat,
GZ ‘s-Hertogenbosch, the Netherlands
| | - Olivier Koning
- Department of Vascular Surgery, Jeroen Bosch Ziekenhuis, Henri Dunantstraat,
GZ ‘s-Hertogenbosch, the Netherlands
| | - Martin Teraa
- Department of Vascular Surgery, UMC Utrecht, CX Utrecht, the
Netherlands
- Department of Vascular Surgery, Jeroen Bosch Ziekenhuis, Henri Dunantstraat,
GZ ‘s-Hertogenbosch, the Netherlands
- Department of Nephrology and Hypertension, UMC Utrecht, Heidelberglaan, CX
Utrecht, the Netherlands
| | - Marianne C. Verhaar
- Department of Nephrology and Hypertension, UMC Utrecht, Heidelberglaan, CX
Utrecht, the Netherlands
| | - Gert J. de Borst
- Department of Vascular Surgery, UMC Utrecht, CX Utrecht, the
Netherlands
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Yamamoto Y, Inoue Y, Igari K, Toyofuku T, Kudo T, Uetake H. Assessment of the Severity of Ischaemia and the Outcomes of Revascularisation in Peripheral Arterial Disease Patients Based on the Skin Microcirculatory Response to a Thermal Load Test. EJVES Short Rep 2019; 42:21-25. [PMID: 30815594 PMCID: PMC6378628 DOI: 10.1016/j.ejvssr.2018.12.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2018] [Revised: 12/21/2018] [Accepted: 12/27/2018] [Indexed: 11/18/2022] Open
Abstract
Objective This study investigated the skin microcirculatory response to a thermal load test using a laser Doppler flowmetry device to evaluate the severity of limb ischaemia and the outcomes of revascularisation in patients with peripheral arterial disease (PAD). Methods A total of 34 PAD patients (39 limbs) including 17 critical limb ischaemia (CLI) patients (21 limbs) who underwent revascularisation were enrolled. The skin microcirculation of the dorsal side of the affected foot was investigated for 15 minutes after local heating. The tests were performed both before and after revascularisation, and several parameters gleaned from the microcirculatory fluctuations were analysed and compared with the ankle brachial pressure index and the transcutaneous oxygen tension (tcPO2) values. Results Among the parameters, significant differences were observed between the CLI patients and patients with claudication with regard to the increasing phase time (Tinc), the difference in the perfusion values at the onset and the peak of the transient increase in blood perfusion (PΔ), the slope of the transient increase in blood perfusion (Sin), and the slope of the decrease in blood perfusion after the peak (Sde). In CLI patients, the PΔ, Sin, and Sde values increased significantly after revascularisation. In the patients with claudication, the changes in the parameters after revascularisation were not statistically significant. The Sde showed the most statistically significant correlation with the tcPO2 value (ρ .759, p < .001). Conclusions Thermal load testing can be used to evaluate the severity of limb ischaemia in patients with PAD. New thermal load testing for evaluation of the severity of limb ischaemia is presented. Skin blood flow response to thermal load was investigated by laser Doppler flowmetry. Thermal load testing can be used to evaluate the severity of limb ischaemia.
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Affiliation(s)
- Yohei Yamamoto
- Department of Surgical Specialties, Tokyo Medical and Dental University, Tokyo, Japan
- Corresponding author. Department of Surgical Specialties, Tokyo Medical and Dental University, 1–5-45 Yushima, Bunkyo-ku, Tokyo, 113–8519, Japan.
| | | | - Kimihiro Igari
- Department of Surgical Specialties, Tokyo Medical and Dental University, Tokyo, Japan
| | - Takahiro Toyofuku
- Department of Surgical Specialties, Tokyo Medical and Dental University, Tokyo, Japan
| | - Toshifumi Kudo
- Department of Surgical Specialties, Tokyo Medical and Dental University, Tokyo, Japan
| | - Hiroyuki Uetake
- Department of Surgical Specialties, Tokyo Medical and Dental University, Tokyo, Japan
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10
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Exercise Oximetry and Laser Speckle Contrast Imaging to Assess Microvascular Function in Lower Extremity Peripheral Artery Disease. Cardiovasc Drugs Ther 2018; 32:405-407. [PMID: 29987479 DOI: 10.1007/s10557-018-6806-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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11
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Henni S, Ammi M, Abraham P. Use of Local Thermal Load for Patients with Critical Limb Ischemia. Ann Vasc Surg 2018; 49:319-320. [PMID: 29481942 DOI: 10.1016/j.avsg.2017.12.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2017] [Accepted: 12/19/2017] [Indexed: 10/18/2022]
Affiliation(s)
- Samir Henni
- Department of vascular medicine, University Hospital, Angers, France
| | - Myriam Ammi
- Department of vascular medicine, University Hospital, Angers, France
| | - Pierre Abraham
- Department of vascular medicine, University Hospital, Angers, France.
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