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Javaid H, Kumarnsit E, Chatpun S. Age-Related Alterations in EEG Network Connectivity in Healthy Aging. Brain Sci 2022; 12:brainsci12020218. [PMID: 35203981 PMCID: PMC8870284 DOI: 10.3390/brainsci12020218] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [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: 01/04/2022] [Revised: 01/28/2022] [Accepted: 02/01/2022] [Indexed: 02/01/2023] Open
Abstract
Emerging studies have reported that functional brain networks change with increasing age. Graph theory is applied to understand the age-related differences in brain behavior and function, and functional connectivity between the regions is examined using electroencephalography (EEG). The effect of normal aging on functional networks and inter-regional synchronization during the working memory (WM) state is not well known. In this study, we applied graph theory to investigate the effect of aging on network topology in a resting state and during performing a visual WM task to classify aging EEG signals. We recorded EEGs from 20 healthy middle-aged and 20 healthy elderly subjects with their eyes open, eyes closed, and during a visual WM task. EEG signals were used to construct the functional network; nodes are represented by EEG electrodes; and edges denote the functional connectivity. Graph theory matrices including global efficiency, local efficiency, clustering coefficient, characteristic path length, node strength, node betweenness centrality, and assortativity were calculated to analyze the networks. We applied the three classifiers of K-nearest neighbor (KNN), a support vector machine (SVM), and random forest (RF) to classify both groups. The analyses showed the significantly reduced network topology features in the elderly group. Local efficiency, global efficiency, and clustering coefficient were significantly lower in the elderly group with the eyes-open, eyes-closed, and visual WM task states. KNN achieved its highest accuracy of 98.89% during the visual WM task and depicted better classification performance than other classifiers. Our analysis of functional network connectivity and topological characteristics can be used as an appropriate technique to explore normal age-related changes in the human brain.
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Affiliation(s)
- Hamad Javaid
- Department of Biomedical Sciences and Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand;
| | - Ekkasit Kumarnsit
- Physiology Program, Division of Health and Applied Science, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand;
- Biosignal Research Centre for Health, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand
| | - Surapong Chatpun
- Department of Biomedical Sciences and Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand;
- Biosignal Research Centre for Health, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand
- Institute of Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand
- Correspondence:
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Samae M, Chatpun S, Chirasatitsin S. Hemagglutination Detection with Paper-Plastic Hybrid Passive Microfluidic Chip. Micromachines (Basel) 2021; 12:1533. [PMID: 34945381 PMCID: PMC8708700 DOI: 10.3390/mi12121533] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 12/04/2021] [Accepted: 12/07/2021] [Indexed: 01/21/2023]
Abstract
Hemagglutination is a critical reaction that occurs when antigens expressed on red blood cells (RBCs) react with the antibodies used for blood typing. Even though blood typing devices have been introduced to the market, they continue to face several limitations in terms of observation by the eye alone, blood manipulation difficulties, and the need for large-scale equipment, particularly process automated machines. Thus, this study aimed to design, fabricate, and test a novel hybrid passive microfluidic chip made of filter paper and polymer using a cost-effective xurography manufacturing technique. This chip is referred to as the microfluidic paper-plastic hybrid passive device (PPHD). A passive PPHD does not require external sources, such as a syringe pump. It is composed of a paper-based component that contains dried antibodies within its porous paper and a polymer component that serves as the detection zone. A single blood sample was injected into the chip's inlet, and classification was determined using the mean intensity image. The results indicated that embedded antibodies were capable of causing RBC agglutination without a saline washing step and that the results could be classified as obviously agglutination or nonagglutination for blood typing using both the naked eye and a mean intensity image. As a proof-of-concept, this study demonstrated efficiency in quantitative hemagglutination measurement within a passive PPHD for blood typing, which could be used to simplify blood biomarker analysis.
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Affiliation(s)
| | | | - Somyot Chirasatitsin
- Department of Biomedical Sciences and Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, Hat Yai 90110, Thailand; (M.S.); (S.C.)
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Liawrungrueang W, Wongsiri S, Chatpun S. Carpal Tunnel Surgery Using a Wireless Endoscopic Visualization Instrument: A Cadaveric Study. J Hand Surg Asian Pac Vol 2021; 26:359-363. [PMID: 34380385 DOI: 10.1142/s2424835521500326] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Background: Endoscopic carpal tunnel release is a common treatment for moderate to severe carpal tunnel syndrome. Recently there have been various new techniques which offer improved accuracy and decreased recovery time. In this study, orthopedic surgeons and biomedical engineers from the Faculty of Medicine and Faculty of Engineering, Prince of Songkla University, designed a wireless endoscopic carpal tunnel release with a single portal technique and tested the efficacy and safety of the new technique in a cadaveric study. Methods: Ten fresh cadaveric forearms were used in the study. The surgical technique began with a surgical incision 15-20 mm above the wrist crease on the line between the middle finger and ring finger. The palmaris longus aponeurosis was retracted by Senn retractors. A visual enhancer was inserted to improve the internal visual field in order to see the flexor retinaculum clearly. The flexor retinaculum was cut distally to create an entry and the flexor retinaculum was cut by the scalpel. The flexor retinaculum length was observed until the release was completed. The median nerve was observed. Results: Each flexor retinaculum was cut completely. All of the median nerves were carefully observed during the operation and none were injured. This technique showed the effectiveness and safety of minimally invasive carpal tunnel surgery. Conclusions: The study found that the new device using this technique is effective for carpal tunnel syndrome (CTS) surgery in terms of minimally invasive endoscopic carpal tunnel surgery.
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Affiliation(s)
| | - Sunton Wongsiri
- Department of Orthopaedics, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand
| | - Surapong Chatpun
- Institute of Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand
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Srewaradachpisal S, Dechwayukul C, Chatpun S, Spontak RJ, Thongruang W. Optimization of the Rubber Formulation for Footwear Applications from the Response Surface Method. Polymers (Basel) 2020; 12:polym12092032. [PMID: 32906718 PMCID: PMC7563865 DOI: 10.3390/polym12092032] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 08/30/2020] [Accepted: 08/31/2020] [Indexed: 12/03/2022] Open
Abstract
Impact force remains the primary cause of foot injury and general discomfort with regard to footwear. The footwear industry traditionally relies on modified elastomers (including natural rubber) whose properties can be physically adjusted by varying the constituents in the rubber formulations. This work aims to investigate the effect of filler/plasticizer fractions on shock attenuation of natural rubber soles. The statistical response surface method (RSM) was used to optimize the loading of natural rubber, fillers (carbon black and china clay) and a plasticizer (paraffinic oil). A novel predictive equation addressing the effects of additives on the physical and mechanical properties of the shoe sole was successfully created using the RSM. Our results demonstrate how the concentrations of these components regulate final properties, such as impact force absorption and hardness, in the commercial manufacture of shoe soles. While a higher loading level of plasticizer promotes reductions in hardness and impact force, as well as energy dissipation, in these modified elastomers, these properties were improved by increasing the filler content.
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Affiliation(s)
- Satta Srewaradachpisal
- Department of Mechanical Engineering, Faculty of Engineering, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand; (S.S.); (C.D.)
| | - Charoenyutr Dechwayukul
- Department of Mechanical Engineering, Faculty of Engineering, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand; (S.S.); (C.D.)
| | - Surapong Chatpun
- Institute of Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand;
| | - Richard J. Spontak
- Departments of Chemical & Biomolecular Engineering and Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695, USA;
| | - Wiriya Thongruang
- Department of Mechanical Engineering, Faculty of Engineering, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand; (S.S.); (C.D.)
- Correspondence: ; Tel.: +66-7428-7217
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Sookkasem A, Luang‐ni P, Wansuksri R, Lertpanich S, Piyachomkwan K, Chatpun S. Physical and Rheological Characteristics of Hydroxypropyl, Acid‐Thinned Tapioca Starch‐Based Plasma Expander for Blood Volume Replacement. STARCH-STARKE 2020. [DOI: 10.1002/star.201900224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Atitaya Sookkasem
- Institute of Biomedical Engineering, Faculty of MedicinePrince of Songkla University Songkhla 90110 Thailand
| | - Paweena Luang‐ni
- Institute of Biomedical Engineering, Faculty of MedicinePrince of Songkla University Songkhla 90110 Thailand
| | - Rungtiva Wansuksri
- National Center for Genetic Engineering and BiotechnologyNational Science and Technology Development Agency Klong Luang Pathum Thani 12120 Thailand
| | - Sirithorn Lertpanich
- National Center for Genetic Engineering and BiotechnologyNational Science and Technology Development Agency Klong Luang Pathum Thani 12120 Thailand
| | - Kuakoon Piyachomkwan
- National Center for Genetic Engineering and BiotechnologyNational Science and Technology Development Agency Klong Luang Pathum Thani 12120 Thailand
| | - Surapong Chatpun
- Institute of Biomedical Engineering, Faculty of MedicinePrince of Songkla University Songkhla 90110 Thailand
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Samerphob N, Cheaha D, Issuriya A, Chatpun S, Lertwittayanon W, Jensen O, Kumarnsit E. Changes in neural network connectivity in mice brain following exposures to palatable food. Neurosci Lett 2020; 714:134542. [PMID: 31629035 DOI: 10.1016/j.neulet.2019.134542] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Revised: 09/23/2019] [Accepted: 10/09/2019] [Indexed: 10/25/2022]
Abstract
Previously, satiated animals or human subjects can still be motivated to eat by palatable food-associated cues. However, neural circuitries of hedonic hunger have not been well investigated. This study identified neural network connectivities between major brain areas in response to chocolate-associated cues following repeated exposures to chocolate. Adult male Swiss albino ICR mice were anesthetized and implanted with intracranial electrodes in the lateral hypothalamus (LHa), nucleus accumbens (NAc), olfactory bulb (OB) and hippocampus (HP) for local field potential (LFP) recording. LFP oscillations were recorded before and after repeated exposures to chocolate for chocolate experienced group whereas control group was not exposed to chocolate. On testing days, satiated animals were individually put into a place preference-like apparatus with two opposite chambers of chocolate and normal chow scent cues, separately. The results showed that chocolate experienced group significantly increased time spent in chocolate chamber whereas control group did not. One-way ANOVA revealed significant influence of chocolate sessions on LFP spectral powers of multiple frequencies in the LHa (delta, low gamma and high gamma) and NAc (high gamma). Moreover, coherence function analyses also highlighted significant increases in LHa-NAc and LHa-OB, and decrease in LHa-HP coherent activities in response to olfactory cues of chocolate. This study demonstrated modifications of neural network connectivity and associative learning following multiple exposures to palatable food. These findings might explain why energy homeostatic hunger is overridden by hedonic hunger.
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Affiliation(s)
- Nifareeda Samerphob
- Department of Physiology, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, 90112, Thailand; Research Unit for EEG Biomarkers of Neuronal diseases, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, 90112, Thailand.
| | - Dania Cheaha
- Department of Biology, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, 90112, Thailand; Research Unit for EEG Biomarkers of Neuronal diseases, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, 90112, Thailand
| | - Acharaporn Issuriya
- Department of Physiology, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, 90112, Thailand
| | - Surapong Chatpun
- Institute of Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, Hat Yai, Songkhla, 90112, Thailand; Research Unit for EEG Biomarkers of Neuronal diseases, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, 90112, Thailand
| | - Wanida Lertwittayanon
- Department of Physiology, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, 90112, Thailand
| | - Ole Jensen
- Department of Psychology, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom
| | - Ekkasit Kumarnsit
- Department of Physiology, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, 90112, Thailand; Research Unit for EEG Biomarkers of Neuronal diseases, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, 90112, Thailand
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Nouman M, Dissaneewate T, Leelasamran W, Chatpun S. The insole materials influence the plantar pressure distributions in diabetic foot with neuropathy during different walking activities. Gait Posture 2019; 74:154-161. [PMID: 31525653 DOI: 10.1016/j.gaitpost.2019.08.023] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 08/12/2019] [Accepted: 08/30/2019] [Indexed: 02/02/2023]
Abstract
BACKGROUND Abnormal peak plantar pressure in neuropathic diabetic foot during walking activities is well managed through the use of appropriate design and material selection for the fabrication of custom made insoles (CMI). The redistribution of plantar pressure is possible by selecting an appropriate material for the fabrication of CMI. The walking activities may alter the plantar pressure distribution; which may differ while using CMI with different materials. OBJECTIVE The objective of the study was to evaluate the effectiveness of CMI's materials on plantar pressure distribution during different walking activities, in diabetic feet with neuropathy. METHODS The study was conducted on sixteen diabetic neuropathic subjects. The subjects were provided with two types of CMI; CMI-A (Plastazote® and microcellular rubber) and CMI-B (Multifoam, Plastazote® and microcellular rubber). Maximum peak plantar pressure and plantar pressure distribution were determined by Pedar-X® sensor insole during level walking, ramp walking and stair walking. RESULTS The CMI-B lessened the maximum peak plantar pressure from the forefoot throughout the walking activities compared to CMI-A. The contact area was observed as lower using CMI-A compared to CMI-B, while performing walking activities. CONCLUSION CMI-B, with multifoam as an additional top layer, provided more effective peak plantar pressure reduction at forefoot and it had better plantar pressure distribution compared to CMI-A during level walking and ramp ascending in diabetic foot with neuropathy.
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Affiliation(s)
- Muhammad Nouman
- Institute of Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, Hatyai, Songkhla, Thailand
| | - Tulaya Dissaneewate
- Department of Orthopedic Surgery and Physical Medicine, Faculty of Medicine, Prince of Songkla University, Hatyai, Songkhla, Thailand
| | - Wipawan Leelasamran
- Department of Orthopedic Surgery and Physical Medicine, Faculty of Medicine, Prince of Songkla University, Hatyai, Songkhla, Thailand
| | - Surapong Chatpun
- Institute of Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, Hatyai, Songkhla, Thailand.
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Algabri YA, Altwijri O, Chatpun S. Visualization of Blood Flow in AAA Patient-Specific Geometry: 3-D Reconstruction and Simulation Procedures. BioNanoSci 2019. [DOI: 10.1007/s12668-019-00662-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Algabri YA, Rookkapan S, Gramigna V, Espino DM, Chatpun S. Correction to: Computational study on hemodynamic changes in patient-specific proximal neck angulation of abdominal aortic aneurysm with time-varying velocity. Australas Phys Eng Sci Med 2019; 42:191. [PMID: 30835076 DOI: 10.1007/s13246-019-00741-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
The name of the third author was incorrect in the initial online publication. The original article has been corrected.
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Affiliation(s)
- Yousif A Algabri
- Institute of Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, 6th floor, 100-year Building, Hatyai, Songkhla, 90110, Thailand
| | - Sorracha Rookkapan
- Department of Radiology, Faculty of Medicine, Prince of Songkla University, Hatyai, Songkhla, 90110, Thailand
| | - Vera Gramigna
- Neuroscience Research Center, University Magna Graecia, 88100, Catanzaro, Italy
| | - Daniel M Espino
- Department of Mechanical Engineering, University of Birmingham, Birmingham, B15 2TT, UK
| | - Surapong Chatpun
- Institute of Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, 6th floor, 100-year Building, Hatyai, Songkhla, 90110, Thailand.
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Prachgosin T, Leelasamran W, Smithmaitrie P, Chatpun S. Effect of total-contact orthosis on medial longitudinal arch and lower extremities in flexible flatfoot subjects during walking. Prosthet Orthot Int 2017; 41:579-586. [PMID: 29214919 DOI: 10.1177/0309364617691621] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
BACKGROUND Total-contact orthosis (TCO) is one kind of foot orthosis (FO) that is used to adjust biomechanics in flexible flatfoot. OBJECTIVE To determine the effects of a TCO on the MLA moment, MLA deformation angle and lower limb biomechanics. STUDY DESIGN Cross-sectional study. METHODS Seven-flatfoot and thirteen-normal foot subjects were recruited by footprint and radiographs. The biomechanics of subjects with normal foot (NF), flatfoot with shoe only (FWOT) and flatfoot with TCO (FWT) were collected in a 3D motion analysis laboratory and force plates. The MLA and lower limb biomechanics in each condition during specific sub-phases of stance were analyzed. RESULTS The NF had larger MLA eversion moment after shod walking ( p = 0.001). The FWT condition compared with the FWOT condition had a significantly larger peak MLA upward moment ( p = 0.035) during pre-swing, larger peak knee external rotation angle ( p = 0.040) during mid stance, smaller peak knee extension moment during terminal stance ( p = 0.035) and a larger ground reaction force in the anterior-posterior direction during early stance ( p < 0.05). CONCLUSION Our study found positive effects from the customized TCOs which included an increased TCO angle that led to a decreased peak MLA moment in the frontal plane in flexible flatfoot subjects during walking. Clinical relevance Lower limb biomechanics is different from normal in subjects with flexible flatfoot. The design of a TCO affects MLA, ankle and knee biomechanics and may be used to clinically correct biomechanical changes in flexible flatfoot.
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Affiliation(s)
- Tulaya Prachgosin
- 1 Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand
| | | | | | - Surapong Chatpun
- 1 Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand
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Nouman M, Leelasamran W, Chatpun S. Effectiveness of Total Contact Orthosis for Plantar Pressure Redistribution in Neuropathic Diabetic Patients During Different Walking Activities. Foot Ankle Int 2017; 38:901-908. [PMID: 28459164 DOI: 10.1177/1071100717704427] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
BACKGROUND Using a total contact orthosis (TCO) is an effective method to offload in diabetic patients with foot neuropathy. However, the redistribution of peak plantar pressure is mostly observed during level walking, which may differ from other walking activities. The aim of this study was to investigate the plantar pressure from 4 regions of the foot during different walking activities (level walking, ramp ascending, ramp descending, stair ascending, and stair descending) in neuropathic diabetic patients with and without a TCO. METHODS Sixteen neuropathic diabetic patients aged 40 to 60 years with calluses and hallux valgus were included in this study and were provided with TCOs made up of multifoam, Plastazote, and microcellular rubber. The plantar pressure and contact area with the TCO and without the TCO were recorded using the Pedar X system during different walking activities. RESULTS A significant reduction of plantar pressure during different walking activities at the toes and forefoot regions was observed while walking with the TCO compared with walking without the TCO (control condition). Plantar pressure increased at the midfoot region when walking with the TCO, and no significant difference was observed at the hindfoot region between the control and TCO conditions. Furthermore, maximum contact area was observed during level walking with the TCO compared with other walking activities. CONCLUSION The TCO significantly reduced and redistributed the peak plantar pressure from the sites where the ulceration rate is higher at the toes and forefoot compared with the other regions of the foot. LEVEL OF EVIDENCE Therapeutic level II, lesser quality randomized controlled trial.
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Affiliation(s)
- Muhammad Nouman
- 1 Institute of Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, Hat Yai, Songkhla, Thailand
| | - Wipawan Leelasamran
- 2 Faculty of Medicine, Prince of Songkla University, Hatyai, Songkhla, Thailand
| | - Surapong Chatpun
- 1 Institute of Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, Hat Yai, Songkhla, Thailand
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Samerphob N, Cheaha D, Chatpun S, Kumarnsit E. Hippocampal CA1 local field potential oscillations induced by olfactory cue of liked food. Neurobiol Learn Mem 2017; 142:173-181. [DOI: 10.1016/j.nlm.2017.05.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2016] [Revised: 04/20/2017] [Accepted: 05/17/2017] [Indexed: 12/30/2022]
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Carty G, Chatpun S, Espino DM. Modeling Blood Flow Through Intracranial Aneurysms: A Comparison of Newtonian and Non-Newtonian Viscosity. J Med Biol Eng 2016. [DOI: 10.1007/s40846-016-0142-z] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Chatpun S, Sawanyawisuth K, Wansuksri R, Piyachomkwan K. Characterization and physiological effect of tapioca maltodextrin colloid plasma expander in hemorrhagic shock and resuscitation model. J Mater Sci Mater Med 2016; 27:98. [PMID: 27015687 DOI: 10.1007/s10856-016-5708-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2016] [Accepted: 03/15/2016] [Indexed: 06/05/2023]
Abstract
Plasma expanders (PEs) are administered fluids to replace blood volume when massive blood loss has occured. Maltodextrin from tapioca starch was selected as a study candidate to prepare a colloid PE due to an uncomplicated production process. The formulations of mixture between tapioca maltodextrin and 0.9 % sodium chloride solution were prepared and then characterized. This was to investigate the effects of a dextrose equivalent (DE) and the concentration on the physical properties. Storage stability of each formulation was also determined and compared with clinically used PE [6 % hydroxyethyl starch (HES), 130/0.4]. The effects on the circulatory system in hamsters with hemorrhagic shock and resuscitation using prepared PE were also investigated. The results showed that low DE value led to high retrogradation, turbidity and viscosity but low colloid osmotic pressure and poor solubility. Among the prepared solutions, tapioca maltodextrin with DE6 at 10 % w/v concentration had comparable properties with 6 % HES 130/0.4. Animals resuscitated with 10 % DE6 PE had improved mean arterial blood pressure similar to those resuscitated with 6 % HES 130/0.4. However, several parameters in animals resuscitated with 10 % DE6 PE were lower than those resuscitated with 6 % HES 130/0.4, i.e., heart rate, functional capillary density. Therefore, if using tapioca maltodextrin for PE, some properties have to be considered and efficiently optimized.
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Affiliation(s)
- Surapong Chatpun
- Institute of Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, 6th floor, 100 year Building, Hatyai, Songkhla, 90110, Thailand.
- Biological Materials for Medicine Research Unit, Faculty of Medicine, Prince of Songkla University, Songkhla, 90110, Thailand.
| | - Kittisak Sawanyawisuth
- Department of Medicine, Faculty of Medicine, Khon Kaen University, Khon Kaen, 40002, Thailand
- The Research and Training Center for Enhancing Quality of Life of Working-Age People, Khon Kaen University, Khon Kaen, 40002, Thailand
| | - Rungtiva Wansuksri
- National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Klong Luang, Pathum Thani, 12120, Thailand
| | - Kuakoon Piyachomkwan
- National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Klong Luang, Pathum Thani, 12120, Thailand
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Sookkasem A, Chatpun S, Yuenyongsawad S, Wiwattanapatapee R. Alginate beads for colon specific delivery of self-emulsifying curcumin. J Drug Deliv Sci Technol 2015. [DOI: 10.1016/j.jddst.2015.07.005] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Cheaha D, Bumrungsri S, Chatpun S, Kumarnsit E. Characterization of in utero valproic acid mouse model of autism by local field potential in the hippocampus and the olfactory bulb. Neurosci Res 2015; 98:28-34. [DOI: 10.1016/j.neures.2015.04.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Revised: 04/16/2015] [Accepted: 04/22/2015] [Indexed: 10/23/2022]
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Samerphob N, Cheaha D, Chatpun S, Kumarnsit E. Gamma wave oscillation and synchronized neural signaling between the lateral hypothalamus and the hippocampus in response to hunger. J Physiol Sci 2015; 65:S17-S22. [PMID: 31941173 PMCID: PMC10722651 DOI: 10.1007/bf03405851] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The lateral hypothalamus plays an important role in homeostasis. It is sensitive to negative energy balance and believed to interact with other brain regions to mediate food seeking behavior. However, no neural signaling of hunger in the lateral hypothalamus has been studied. Male Swiss albino mice implanted with intracranial electrodes into the lateral hypothalamus and the hippocampus were randomly treated with drinking water for control condition, 18-20 h deprivation of food for hunger condition, and fluid food for satiety condition. Therefore, local field potential (LFP) and locomotor activity of animals were simultaneously recorded. One way ANOVA with Tukey's post hoc test was used for statistical analysis. Frequency analysis of LFP revealed that food deprivation significantly increased the power of gamma oscillation (65-95 Hz) in the lateral hypothalamus and the hippocampus. However, satiety did not change the oscillation in these regions. Moreover, no significant difference among groups was observed for locomotor count and speed. The analysis of coherence values between neural signaling of these two brain areas also confirmed significant increase within a frequency range of 61-92 Hz for hunger. No change in coherence value was induced by satiety. In summary, this study demonstrated neural signaling of the lateral hypothalamus in response to hunger with differential power spectrum of LFP and the interplay with the hippocampus. The data may suggest critical roles of the lateral hypothalamus in detection of negative energy balance and coordination of other higher functions for food related learning or behaviors through the connectivity with the hippocampus.
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Affiliation(s)
- Nifareeda Samerphob
- Department of Physiology, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, 90112, Thailand
| | - Dania Cheaha
- Faculty of Medicine, Princess of Naradhiwas University (PNU), Meang, Narathiwat, 96000, Thailand
| | - Surapong Chatpun
- Institute of Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, Hat Yai, Songkhla, 90112, Thailand
| | - Ekkasit Kumarnsit
- Department of Physiology, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, 90112, Thailand.
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Chatpun S, Meesane J, Rujirojindakul P. Physicochemical properties and responses in microcirculation of native tapioca starch-based plasma expander. J Biomed Mater Res B Appl Biomater 2015; 104:395-401. [PMID: 25892486 DOI: 10.1002/jbm.b.33367] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2014] [Revised: 11/26/2014] [Accepted: 12/09/2014] [Indexed: 11/08/2022]
Abstract
Plasma expanders (PEs) such as hydroxyethyl strach are widely used for volume replacement. The plantation and production of tapioca in Thailand is abundant which may provide a new source for PEs starch with novel properties. This work investigated the properties and circulatory effects of native tapioca starch-based PE (TPE). Various formulations of mixture between native tapioca starch and 0.9% sodium chloride solution were prepared and characterized in order to obtain the proper physicochemical and rheological properties. About 1% concentration by weight per volume of TPE was compared with 6% hydroxyethyl starch 130/0.4 in 0.9% sodium chloride (HES130/0.4) using an acute hemodilution by 40% of blood volume in an animal protocol. TPE had higher turbidity and viscosity but lower colloid osmotic pressure compared with HES 130/0.4. The in vivo study demonstrated that Golden Syrian hamsters hemodiluted with TPE maintained a mean arterial blood pressure and no significant difference compared to HES 130/0.4. The arterial vasodilation and functional capillary density in the animals hemodiluted with TPE had higher values than in the animals hemodiluted with HES 130/0.4. Although the in vivo study reported positive results using this native tapioca starch-based PE, the product needs work to improve some of its physiochemical properties.
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Affiliation(s)
- Surapong Chatpun
- Institute of Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand.,Biological Materials for Medicine Research Unit, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand
| | - Jirut Meesane
- Institute of Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand.,Biological Materials for Medicine Research Unit, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand
| | - Pairaya Rujirojindakul
- Department of Pathology, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand
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Prachgosin T, Chong DYR, Leelasamran W, Smithmaitrie P, Chatpun S. Medial longitudinal arch biomechanics evaluation during gait in subjects with flexible flatfoot. Acta Bioeng Biomech 2015; 17:121-130. [PMID: 26898763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
PURPOSE Medial longitudinal arch (MLA) strengthening has been considered an important part of successful flatfoot treatment. But, to date, the biomechanical loading behavior of the medial arch in flatfoot has not been evaluated. This study aimed to evaluate the MLA moment, MLA deformation angle, foot kinematics and ground reaction forces (GRF) in both normal foot and flatfoot groups. METHODS Each participant's foot was classified according to arch type using foot prints and radiographs. Twenty-eight non-obese adults (13 flatfeet and 15 normal feet) were involved. The biomechanics data were collected in a 3D motion analysis laboratory. The MLA biomechanics were calculated. Hindfoot and forefoot kinematics were also analyzed. RESULTS The flatfoot group had a significantly greater peak eversion MLA moment (p = 0.005) and a smaller peak MLA deformation angle (p < 0.05) during specific subphases. The peak of hindfoot plantarflexion (p < 0.05) and internal rotation (p < 0.05) and the peak of forefoot abduction ( p < 0.05) in the specific subphases were greater in the flatfoot group. The flatfoot group also had significantly smaller peak vertical GRF ( p < 0.05) during late stance and larger peak medial GRF (p < 0.05) during mid stance. CONCLUSIONS This study found a significantly greater eversion deforming force acting at the MLA structure, greater hindfoot and forefoot motion, less MLA flexibility and abnormal GRF in a flatfoot group during walking, which reflected the deficit of foot function in a flatfoot group.
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Affiliation(s)
- Tulaya Prachgosin
- Institute of Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand
| | - Desmond Y R Chong
- Department of Biomedical Engineering, Faculty of Engineering, National University of Singapore, Singapore
| | - Wipawan Leelasamran
- Department of Orthopaedic Surgery and Physical Medicine, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand
| | - Pruittikorn Smithmaitrie
- Department of Mechanical Engineering, Faculty of Engineering, Prince of Songkla University, Songkhla, Thailand
| | - Surapong Chatpun
- Institute of Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand
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Kanokwiroon K, Chatpun S. Response of cardiac endothelial nitric oxide synthase to plasma viscosity modulation in acute isovolemic hemodilution. Asian J Transfus Sci 2014; 8:100-4. [PMID: 25161348 PMCID: PMC4140050 DOI: 10.4103/0973-6247.137444] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Background: Endothelial nitric oxide synthase (eNOS) is generally expressed in endocardial cells, vascular endothelial cells and ventricular myocytes. However, there is no experimental study elucidating the relationship between cardiac eNOS expression and elevated plasma viscosity in low oxygen delivery pathological conditions such as hemorrhagic shock-resuscitation and hemodilution. This study tested the hypothesis that elevated plasma viscosity increases cardiac eNOS expression in a hemodilution model, leading to positive effects on cardiac performance. Materials and Methods: Two groups of golden Syrian hamster underwent an acute isovolemic hemodilution where 40% of blood volume was exchanged with 2% (low-viscogenic plasma expander [LVPE]) or 6% (high-viscogenic plasma expander [HVPE]) of dextran 2000 kDa. In control group, experiment was performed without hemodilution. All groups were performed in awake condition. Experimental parameters, i.e., mean arterial blood pressure (MAP), heart rate, hematocrit, blood gas content and viscosity, were measured. The eNOS expression was evaluated by eNOS Western blot analysis. Results: After hemodilution, MAP decreased to 72% and 93% of baseline in the LVPE and HVPE, respectively. Furthermore, pO2 in the LVPE group increased highest among the groups. Plasma viscosity in the HVPE group was significantly higher than that in control and LVPE groups. The expression of eNOS in the HVPE group showed higher intensity compared to other groups, especially compared with the control group. Conclusion: Our results demonstrated that cardiac eNOS has responded to plasma viscosity modulation with HVPE and LVPE. This particularly supports the previous studies that revealed the positive effects on cardiac function in animals hemodiluted with HVPE.
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Affiliation(s)
- Kanyanatt Kanokwiroon
- Department of Biomedical Sciences, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand
| | - Surapong Chatpun
- Institute of Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand
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21
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Chatpun S, Prakobkarn A, Ina N, Saeheng S. Effects of stenosis on hemodynamics in carotid artery bifurcation using 2D MR‐imaging computational fluid dynamics: simulated versus real cases (671.4). FASEB J 2014. [DOI: 10.1096/fasebj.28.1_supplement.671.4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Surapong Chatpun
- Institute of Biomedical Engineering Prince of Songkla University HatyaiThailand
| | - Arpapan Prakobkarn
- Institute of Biomedical Engineering Prince of Songkla University HatyaiThailand
| | - Natee Ina
- Radiology Prince of Songkla University HatyaiThailand
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Chatpun S, Cabrales P. Nitric oxide synthase inhibition attenuates cardiac response to hemodilution with viscogenic plasma expander. Korean Circ J 2014; 44:105-12. [PMID: 24653740 PMCID: PMC3958604 DOI: 10.4070/kcj.2014.44.2.105] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2013] [Revised: 01/02/2014] [Accepted: 01/13/2014] [Indexed: 11/11/2022] Open
Abstract
BACKGROUND AND OBJECTIVES Increased vascular wall shear stress by elevated plasma viscosity significantly enhances the endothelial nitric oxide synthase (eNOS) activity during an acute isovolemic hemodilution. Also the modulation of plasma viscosity has effects on the cardiac function that were revealed if a left ventricular (LV) pressure-volume (PV) measurement was used. The aim of this study was to assess cardiac function responses to nitric oxide synthase (NOS) inhibitors with the presence of an elevated plasma viscosity but a low hematocrit level. Furthermore, systemic parameters were monitored in a murine model. MATERIALS AND METHODS As test group five anesthetized hamsters were administered with N(G)-nitro-L-arginine methyl ester (L-NAME), NOS inhibitor, whereas five other hamsters were used as control group without L-NAME infusion. The dosage of L-NAME was 10 mg/kg. An isovolemic hemodilution was performed by 40% of estimated blood volume with 6% w/v dextran 2000 kDa, high viscosity plasma expanders (PEs) with viscosity 6.34 cP. LV function was measured and assessed using a 1.4 Fr PV conductance catheter. RESULTS The study results demonstrated that NOS inhibition prevented the normal cardiac adaptive response after hemodilution. The endsystolic pressure increased 14% after L-NAME infusion and maintained higher than at the baseline after hemodilution, whereas it gradually decreased in the animals without L-NAME infusion. The admission of L-NAME significantly decreased the maximum rate of ventricular pressure rise (+dP/dtmax), stroke volume and cardiac output after hemodilution if compared to the control group (p<0.05). CONCLUSION This finding supports the presumption that nitric oxide induced by an increased plasma viscosity with the use of a high viscosity PE plays a major role in the cardiac function during an acute isovolemic hemodilution.
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Affiliation(s)
- Surapong Chatpun
- Institute of Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand
| | - Pedro Cabrales
- Department of Bioengineering, University of California, San Diego, CA, USA
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Chatpun S, Nacharaju P, Cabrales P. Improving cardiac function with new-generation plasma volume expanders. Am J Emerg Med 2012; 31:54-63. [PMID: 22867830 DOI: 10.1016/j.ajem.2012.05.031] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2012] [Revised: 05/24/2012] [Accepted: 05/25/2012] [Indexed: 11/26/2022] Open
Abstract
BACKGROUND Plasma expander (PE) based on polyethylene glycol (PEG) conjugated to albumin has shown positive results maintaining blood volume during hemodilution and restoring blood volume during resuscitation from hemorrhagic shock. Polyethylene glycol conjugation to human serum albumin (HSA), PEG-HSA, increases size, weight, and colloidal osmotic pressure, with minor effects on solution viscosity. METHODS This study was designed to test the hypothesis that PEG-HSA (2 g/dL) produced by direct PEGylation chemistry improves cardiac function during 2 experimental models, (i) moderate hemodilution and (ii) resuscitation from hemorrhagic shock, compared with a conventional colloidal PE (Dextran 70 kd [Dx70], 6 g/dL). Cardiac function was studied using a miniaturized pressure volume conductance catheter implanted in the left ventricle and evaluated in terms of cardiac indices derived from the pressure volume measurements. RESULTS Polyethylene glycol-HSA increased cardiac output, stroke volume, and stroke work and decreased systemic vascular resistance compared with Dx70 in both experimental models. The improvements induced by PEG-HSA in cardiac function were sustained over the observation time. Polyethylene glycol-HSA cardiac mechanoenergetics changes are the result of increased energy transferred per stroke and decreased resistance of the vasculature connecting the heart. In summary, PEG-HSA decreased left ventricle ejection impedance. CONCLUSION Ejection of blood diluted with PEG-HSA presented a reduced load to the heart, increased contractile function, and lowered the energy consumed per unit volume compared with Dx70. Our results emphasize the importance of heart function as a parameter to be included in the evaluation changes induced by new PEs.
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Affiliation(s)
- Surapong Chatpun
- Department of Bioengineering, University of California-San Diego, La Jolla, CA 92093, USA
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Chatpun S, Cabrales P, Tsai A, Intaglietta M. Nitric Oxide Synthase Inhibition Weakens Beneficial Effects of Increased Plasma Viscosity on Cardiac Function in Hemodilution Model. FASEB J 2012. [DOI: 10.1096/fasebj.26.1_supplement.864.8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Surapong Chatpun
- Institute of Biomedical EngineeringFaculty of MedicinePrince of Songkla UniversityHatyaiThailand
| | - Pedro Cabrales
- BioengineeringUniversity of CaliforniaSan Diego, La JollaCA
| | - Amy Tsai
- BioengineeringUniversity of CaliforniaSan Diego, La JollaCA
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Chatpun S, Cabrales P. Exogenous intravascular nitric oxide enhances ventricular function after hemodilution with plasma expander. Life Sci 2012; 90:39-46. [PMID: 22056371 DOI: 10.1016/j.lfs.2011.10.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2011] [Revised: 09/17/2011] [Accepted: 10/03/2011] [Indexed: 11/30/2022]
Abstract
AIMS This study evaluated the hypothesis that exogenous nitric oxide (NO) supplementation during acute hemodilution with plasma expander (PE) provides beneficial effects on cardiac function. MAIN METHODS Acute hemodilution in golden Syrian hamsters was induced by a 40% of blood volume exchange with dextran 70 kDa. Intravascular NO supplementation after hemodilution was accomplished with a NO donor, diethylenetriamine NONOate (DETA NONOate). The test group was treated with DETA NONOate, while the control group received only vehicle. Left ventricular cardiac function was studied using pressure-volume measurements obtained with a miniaturized conductance catheter. KEY FINDINGS Cardiac output increased to 122±5% and 107±1% of the baseline in the group treated with NO donor and the vehicle group, respectively. Stroke work per stroke volume (SW/SV) after hemodilution reduced to 90% of the baseline and the NO donor significantly reduced SW/SV compared to the vehicle. The minimum rate of pressure change (dP/dt(min)) was significantly lower in animals treated with the NO donor compared to vehicle treated animals. Systemic vascular resistance (SVR) decreased to 62±5% of the baseline in the NO donor group whereas the vehicle group SVR decreased to 83±5% of the baseline. Using intravital microscopy analysis of microvessel in the dorsal skinfold window chamber, we established that the NO donor group induced significant vasodilation compared to the vehicle group. SIGNIFICANCE NO supplementation in an acute hemodilution with PE has beneficial effects on cardiac performance. However, the NO supplementation effects with a NO donor are dose-independent and short-lasting.
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Affiliation(s)
- Surapong Chatpun
- Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093-0412, USA
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Abstract
Background Previous studies have found that increasing plasma viscosity as whole blood viscosity decrease has beneficial effects in microvascular hemodynamics. As the heart couples with systemic vascular network, changes in plasma and blood viscosity during hemodilution determine vascular pressure drop and flow rate, which influence cardiac function. This study aimed to investigate how changes in plasma viscosity affect on cardiac function during acute isovolemic hemodilution. Materials and Methods Plasma viscosity was modulated by hemodilution of 40% of blood volume with three different plasma expanders (PEs). Dextran 2000 kDa (Dx2M, 6.3 cP) and dextran 70 kDa (Dx70, 3.0 cP) were used as high and moderate viscogenic PEs, respectively. Polyethylene glycol conjugated with human serum albumin (PEG-HSA, 2.2 cP) was used as low viscogenic PE. The cardiac function was assessed using a miniaturized pressure-volume conductance catheter. Results After hemodilution, pressure dropped to 84%, 79%, and 78% of baseline for Dx2M, Dx70 and PEG-HSA, respectively. Cardiac output markedly increased for Dx2M and PEG-HSA. Dx2M significantly produced higher stroke work relative to baseline and compared to Dx70. Conclusion Acute hemodilution with PEG-HSA without increasing plasma viscosity provided beneficial effects on cardiac function compared to Dx70, and similar to those measured with Dx2M. Potentially negative effects of increasing peripheral vascular resistance due to the increase in plasma viscosity were prevented.
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Affiliation(s)
- Surapong Chatpun
- Department of Bioengineering, University of California, San Diego, La Jolla, CA, USA
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Chatpun S, Cabrales P. Effects on cardiac function of a novel low viscosity plasma expander based on polyethylene glycol conjugated albumin. Minerva Anestesiol 2011; 77:704-714. [PMID: 21709658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
BACKGROUND Plasma expanders have become increasingly advantageous when compared to blood transfusion, due to their long shelf-life and cost-effectiveness. A new generation of plasma expander based on polyethylene glycol (PEG) conjugated to human serum albumin (PEG-HSA) has shown positive microvascular effects during extreme hemodilution and fluid resuscitation from severe hemorrhagic shock. PEG conjugation increases uniformly albumin molecular weight (MW) and colloidal osmotic pressure, with minor effects on viscosity. METHODS This study was designed to test the hypothesis that PEG-HSA improves and maintains cardiac function during anemic condition, independently of its lower viscosity, compared to plasma expanders with higher viscosity. To accomplish this objective, we compared PEG-HSA to colloids of different MWs and viscosities, dextran 70 kDa (moderate viscosity plasma expander, MVPE) and dextran 2000 kDa (high viscosity plasma expander, HVPE). Cardiac function was analyzed using indices derived from left ventricular pressure volume, and were assessed using a miniaturized conductance catheter, in two experimental models: 1) hemodilution and 2) resuscitation from hemorrhagic shock. RESULTS After hemodilution, PEG-HSA increased cardiac output compared to MVPE through the entire observation period, and HVPE increased stroke work compared to MVPE. After resuscitation, PEG-HSA increased stroke work compared to HVPE through the entire observation period. In both experimental protocols, cardiac functional changes induced by PEG-HSA were sustained over the observation time. CONCLUSION PEG-HSA, a low viscosity plasma expander, had beneficial effects on cardiac function when compared to conventional colloidal plasma expanders with higher viscosities. Maintenance of homeostasis during hemodilution and resuscitation from hemorrhagic shock using PEG-HSA will lead to a significant decrease of the use of blood, thus alleviating in part, forecasted blood shortages, and significantly reducing morbidity and mortality associated with the use of blood in transfusion medicine.
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Affiliation(s)
- S Chatpun
- Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093-0412, USA
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Abstract
The purpose of this study was to investigate how plasma viscosity affects cardiac and vascular function during moderate hemodilution. Twelve anesthetized hamsters were hemodiluted by 40% of blood volume with two different viscosity plasma expanders. Experimental groups were based on the plasma expander viscosity, namely: high viscosity plasma expander (HVPE, 6.3 mPa · s) and low viscosity plasma expander (LVPE, 2.2 mPa · s). Left ventricular (LV) function was intracardiacally measured with a high temporal resolution miniaturized conductance catheter and concurrent pressure-volume results were used to calculate different LV indices. Independently of the plasma expander, hemodilution decreased hematocrit to 28% in both groups. LVPE hemodilution reduced whole blood viscosity by 40% without changing plasma viscosity, while HVPE hemodilution reduced whole blood viscosity by 23% and almost doubled plasma viscosity relative to baseline. High viscosity plasma expander hemodilution significantly increased cardiac output, stroke volume and stroke work compared to baseline, whereas LVPE hemodilution did not. Furthermore, an increase in plasma viscosity during moderate hemodilution produced a higher energy transfer per unit volume of ejected blood. Systemic vascular resistance decreased after hemodilution in both groups. Counter-intuitively, HVPE hemodilution showed lower vascular resistance and vascular hindrance than LVPE hemodilution. This result suggests that geometrical changes in the circulatory system are induced by the increase in plasma viscosity. In conclusion, an increase in plasma viscosity after moderate hemodilution directly influenced cardiac and vascular function by maintaining hydraulic power and reducing systemic vascular resistance through vasodilation.
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Affiliation(s)
- Surapong Chatpun
- Department of Bioengineering, University of California-San Diego, La Jolla, CA 92093, USA
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Chatpun S, Tsai AG, Intaglietta M. Increasing plasma viscosity enhances left ventricular performance in acute moderate hemodilution. FASEB J 2010. [DOI: 10.1096/fasebj.24.1_supplement.782.4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Amy G. Tsai
- BioengineeringUniversity of California San DiegoLa JollaCA
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Chatpun S, Cabrales P, Tsai A, Intaglietta M. Left ventricular function in hemorrhagic shock and after Hextend
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resuscitation in anesthetized hamster. FASEB J 2009. [DOI: 10.1096/fasebj.23.1_supplement.794.5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | - Amy Tsai
- BioengineeringUniversity of CaliforniaSan Diego, La JollaCA
- La Jolla Bioengineering InstituteLa JollaCA
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