1
|
Zhong J, Lin W, Chen J, Gao Q. Higher critical closing pressure is independently associated with enlarged basal ganglia perivascular spaces. Front Neurol 2023; 14:1165469. [PMID: 37920831 PMCID: PMC10619908 DOI: 10.3389/fneur.2023.1165469] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Accepted: 09/18/2023] [Indexed: 11/04/2023] Open
Abstract
Objective This study aimed to explore the association between cerebral hemodynamic parameters focused on the critical closing pressure (CCP) and enlarged perivascular spaces (EPVS). Methods Cerebral blood velocity in the middle cerebral artery (MCAv) and non-invasive continuous blood pressure (NIBP) were measured using a transcranial Doppler (TCD) and Finometer, followed by the calculation of cerebral hemodynamic parameters including CCP, resistance area product (RAP), pulsatility index (PI), and pulse pressure (PP). EPVS were graded separately in the basal ganglia (BG) and centrum semiovale (CSO), using a visual semiquantitative ordinal scale. Patients with EPVS >10 were classified into the severe BG-EPVS group and severe CSO-EPVS group, and the remainder into the mild BG-EPVS group and the mild CSO-EPVS group. Spearman's correlation and binary logistic regression analysis were performed to analyze the relationship between hemodynamic parameters and BG-EPVS and CSO-EPVS, respectively. Results Overall, 107 patients were enrolled. The severe BG-EPVS group had higher CCP, mean arterial blood pressure (MABP), systolic blood pressure (SBP), and diastolic blood pressure (DBP) than that in the mild BG-EPVS group (p < 0.05). There was no statistical difference in hemodynamic parameters between the severe CSO-EPVS group and the mild CSO-EPVS group. Spearman's correlation analysis showed that CCP was positively associated with BG-EPVS (rho = 0.331, p < 0.001) and CSO-EPVS (rho = 0.154, p = 0.044). The binary logistic regression analysis showed that CCP was independently associated with severe BG-EPVS (p < 0.05) and not with CSO-EPVS (p > 0.05) after adjusting for confounders. Conclusion CCP representing cerebrovascular tension was independently associated with BG-EPVS.
Collapse
Affiliation(s)
| | | | | | - Qingchun Gao
- Department of Neurology, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| |
Collapse
|
2
|
Ide K. Acute hypoxia elicits prefrontal oxygenation asymmetry in young adults. Neurophotonics 2023; 10:045002. [PMID: 37808565 PMCID: PMC10551723 DOI: 10.1117/1.nph.10.4.045002] [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] [Figures] [Subscribe] [Scholar Register] [Received: 06/03/2023] [Revised: 09/11/2023] [Accepted: 09/15/2023] [Indexed: 10/10/2023]
Abstract
Significance Cerebrovascular reactivity can be evaluated by prefrontal cortex (PFC) hemodynamic responses and oxygenation changes secondary to hypoxia using near-infrared spectroscopy (NIRS). However, whether there are hemispheric differences in these NIRS-determined PFC hemodynamic responses and oxygenation changes remains unknown. Aim This study was performed to determine whether there are differences in the PFC hemodynamic responses and oxygenation changes secondary to hypoxia between the left and right frontal poles (FPL and FPR, respectively). Approach Fifteen young men participated in the study. During conduction of an isocapnic hypoxia protocol with a 10-min hypoxic phase at partial pressure of end-tidal oxygen (PET O 2 ) of 45 Torr, hemodynamic and oxygenation indices comprising oxygenated hemoglobin (oxy-Hb), deoxygenated Hb (deoxy-Hb), total Hb (total-Hb), and tissue oxygen saturation (StO 2 ) over FPL and FPR were measured by NIRS. The heart rate (HR) was evaluated by electrocardiography. Results In response to hypoxia, the HR increased, oxy-Hb decreased, deoxy-Hb increased, total-Hb increased above baseline, and StO 2 decreased. There was no difference in the change in total-Hb between FPL and FPR. However, there were greater changes in oxy-Hb, deoxy-Hb, and StO 2 over FPL than over FPR, indicating that PFC oxygenation asymmetry occurs in response to hypoxia. Moreover, the change in total-Hb over FPL was associated with the increase in HR. Conclusions NIRS-determined hemodynamic responses and oxygenation changes secondary to hypoxia might not simply reflect the direct effect of hypoxia on cerebral vessels. Although there is no hemispheric difference in the PFC hemodynamic responses to hypoxia as in total-Hb, PFC oxygenation asymmetry occurs in young adults.
Collapse
Affiliation(s)
- Kojiro Ide
- Hokusho University, School of Lifelong Sport, Northern Region Lifelong Sports Research Center, Hokkaido, Japan
| |
Collapse
|
3
|
Kamiya I, Kim C, Kageyama A, Sakamoto A. Lateral position does not cause an interhemicerebral difference of cerebral hemodynamic in healthy adult volunteers. Physiol Rep 2023; 11:e15685. [PMID: 37144602 PMCID: PMC10161209 DOI: 10.14814/phy2.15685] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 04/17/2023] [Accepted: 04/19/2023] [Indexed: 05/06/2023] Open
Abstract
Cerebral perfusion is maintained at a consistent value irrespective of changes in systemic blood pressure or disease-induced changes in general physical condition. This regulatory mechanism is effective despite postural changes, working even during changes in posture, such as those from sitting to standing or from the head-down to the head-up position. However, no study has addressed changes in perfusion separately in the left and right cerebral hemispheres, and there has been no specific investigation of the effect of the lateral decubitus position on perfusion in each hemisphere. Surgery, particularly respiratory surgery, is often performed with the patient in the lateral decubitus position, and since intraoperative anesthesia may also have an effect, it is important to ascertain the effect of the lateral decubitus position on perfusion in the left and right cerebral hemispheres in the absence of anesthesia. The effects of the lateral decubitus position on heart rate, blood pressure, and hemodynamic in the left and right cerebral hemispheres assessed by regional saturation of oxygen measured by near-infrared spectroscopy were investigated in healthy adult volunteers. Although the lateral decubitus position causes systemic circulatory changes, it may not cause any difference in hemodynamic between the left and right cerebral hemispheres.
Collapse
Affiliation(s)
- Ichiro Kamiya
- Department of Anesthesiology, Nippon Medical School, Chiba Hokusoh Hospital, Chiba, Japan
| | - Chol Kim
- Department of Anesthesiology, Nippon Medical School, Chiba Hokusoh Hospital, Chiba, Japan
| | - Atsuko Kageyama
- Department of Anesthesiology, Nippon Medical School, Chiba Hokusoh Hospital, Chiba, Japan
| | - Atsuhiro Sakamoto
- Department of Anesthesiology and Pain Medicine, Nippon Medical School, Tokyo, Japan
| |
Collapse
|
4
|
Shen Y, van der Harst JJ, Wei Y, Bokkers RPH, van Dijk JMC, Uyttenboogaart M. Validation of a cerebral hemodynamic model with personalized calibration in patients with aneurysmal subarachnoid hemorrhage. Front Bioeng Biotechnol 2022; 10:1031600. [PMID: 36507259 PMCID: PMC9732662 DOI: 10.3389/fbioe.2022.1031600] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Accepted: 11/08/2022] [Indexed: 11/27/2022] Open
Abstract
This study aims to validate a numerical model developed for assessing personalized circle of Willis (CoW) hemodynamics under pathological conditions. Based on 66 computed tomography angiography images, investigations were obtained from 43 acute aneurysmal subarachnoid hemorrhage (aSAH) patients from a local neurovascular center. The mean flow velocity of each artery in the CoW measured using transcranial Doppler (TCD) and simulated by the numerical model was obtained for comparison. The intraclass correlation coefficient (ICC) over all cerebral arteries for TCD and the numerical model was 0.88 (N = 561; 95% CI 0.84-0.90). In a subgroup of patients who had developed delayed cerebral ischemia (DCI), the ICC had decreased to 0.72 but remained constant with respect to changes in blood pressure, Fisher grade, and location of ruptured aneurysm. Our numerical model showed good agreement with TCD in assessing the flow velocity in the CoW of patients with aSAH. In conclusion, the proposed model can satisfactorily reproduce the cerebral hemodynamics under aSAH conditions by personalizing the numerical model with TCD measurements. Clinical trial registration: [http://www.trialregister.nl/], identifier [NL8114].
Collapse
Affiliation(s)
- Yuanyuan Shen
- Department of Neurosurgery, University Medical Center Groningen, University of Groningen, Groningen, Netherlands
| | - J. Joep van der Harst
- Department of Neurology, University Medical Center Groningen, University of Groningen, Groningen, Netherlands
| | - Yanji Wei
- Eastern Institute for Advanced Study, Yongriver Institute of Technology, Ningbo, China
| | - Reinoud P. H. Bokkers
- Department of Radiology, Medical Imaging Center, University Medical Center Groningen, University of Groningen, Groningen, Netherlands
| | - J. Marc C. van Dijk
- Department of Neurosurgery, University Medical Center Groningen, University of Groningen, Groningen, Netherlands
| | - Maarten Uyttenboogaart
- Department of Neurology, University Medical Center Groningen, University of Groningen, Groningen, Netherlands,Department of Radiology, Medical Imaging Center, University Medical Center Groningen, University of Groningen, Groningen, Netherlands,*Correspondence: Maarten Uyttenboogaart,
| |
Collapse
|
5
|
Huang M, Jiao X, Jiang J, Yang J, Chu H, Pan J, Cao Y. [An overview on sleep research based on functional near infrared spectroscopy]. Sheng Wu Yi Xue Gong Cheng Xue Za Zhi 2021; 38:1211-1218. [PMID: 34970905 DOI: 10.7507/1001-5515.202102003] [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] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Sleep is a complex physiological process of great significance to physical and mental health, and its research scope involves multiple disciplines. At present, the quantitative analysis of sleep mainly relies on the "gold standard" of polysomnography (PSG). However, PSG has great interference to the human body and cannot reflect the hemodynamic status of the brain. Functional near infrared spectroscopy (fNIRS) is used in sleep research, which can not only meet the demand of low interference to human body, but also reflect the hemodynamics of brain. Therefore, this paper has collected and sorted out the related literatures about fNIRS used in sleep research, concluding sleep staging research, clinical sleep monitoring research, fatigue detection research, etc. This paper provides a theoretical reference for scholars who will use fNIRS for fatigue and sleep related research in the future. Moreover, this article concludes the limitation of existing studies and points out the possible development direction of fNIRS for sleep research, in the hope of providing reference for the study of sleep and cerebral hemodynamics.
Collapse
Affiliation(s)
- Mengying Huang
- Department of Graduate School, Space Engineering University, Beijing 101416, P.R.China
- Key Laboratory of Human Factors Engineering, China Astronaut Research and Training Centre, Beijing 100094, P.R.China
| | - Xuejun Jiao
- Key Laboratory of Human Factors Engineering, China Astronaut Research and Training Centre, Beijing 100094, P.R.China
| | - Jin Jiang
- Key Laboratory of Human Factors Engineering, China Astronaut Research and Training Centre, Beijing 100094, P.R.China
| | - Jiehong Yang
- Department of Graduate School, Space Engineering University, Beijing 101416, P.R.China
- Key Laboratory of Human Factors Engineering, China Astronaut Research and Training Centre, Beijing 100094, P.R.China
| | - Hongzuo Chu
- Department of Graduate School, Space Engineering University, Beijing 101416, P.R.China
- Key Laboratory of Human Factors Engineering, China Astronaut Research and Training Centre, Beijing 100094, P.R.China
| | - Jinjin Pan
- Key Laboratory of Human Factors Engineering, China Astronaut Research and Training Centre, Beijing 100094, P.R.China
| | - Yong Cao
- Key Laboratory of Human Factors Engineering, China Astronaut Research and Training Centre, Beijing 100094, P.R.China
| |
Collapse
|
6
|
Li W, Xu G, Huo C, Xie H, Lv Z, Zhao H, Li Z. Intermittent Sequential Pneumatic Compression Improves Coupling between Cerebral Oxyhaemoglobin and Arterial Blood Pressure in Patients with Cerebral Infarction. Biology (Basel) 2021; 10:869. [PMID: 34571746 DOI: 10.3390/biology10090869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 08/31/2021] [Accepted: 09/01/2021] [Indexed: 11/16/2022]
Abstract
This study aims to explore the effect of intermittent sequential pneumatic compression (ISPC) intervention on the coupling relationship between arterial blood pressure (ABP) and changes in oxyhaemoglobin (Δ [O2Hb]). The coupling strength between the two physiological systems was estimated using a coupling function based on dynamic Bayesian inference. The participants were 22 cerebral infarction patients and 20 age- and sex-matched healthy controls. Compared with resting state, the coupling strength from ABP to Δ [O2Hb] oscillations was significantly lower in the bilateral prefrontal cortex (PFC), sensorimotor cortex (SMC), and temporal lobe cortex (TLC) during the ISPC intervention in cerebral infarction patients in interval II. Additionally, the coupling strength was significantly lower in the bilateral SMC in both groups in interval III. These findings indicate that ISPC intervention may facilitate cerebral circulation in the bilateral PFC, SMC, and TLC in cerebral infarction patients. ISPC may promote motor function recovery through its positive influences on motor-related networks. Furthermore, the coupling between Δ [O2Hb] and ABP allows non-invasive assessments of autoregulatory function to quantitatively assess the effect of rehabilitation tasks and to guide therapy in clinical situations.
Collapse
|
7
|
Viticchi G, Falsetti L, Potente E, Bartolini M, Silvestrini M. Impact of carotid stenosis on cerebral hemodynamic failure and cognitive impairment progression: a narrative review. Ann Transl Med 2021; 9:1209. [PMID: 34430650 PMCID: PMC8350657 DOI: 10.21037/atm-20-7226] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [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: 10/31/2020] [Accepted: 03/05/2021] [Indexed: 11/13/2022]
Abstract
Carotid atherosclerosis has a relevant impact on cerebral blood flow regulation. There is accruing evidence that hemodynamic impairment related to the presence of a significant carotid lumen narrowing may predispose to the development of cerebral dysfunctions, including a reduction in cognitive abilities. In the last years an increasing number of findings showed that carotid stenosis did contribute to cognitive impairment not only in relation to the occurrence of cerebral ischemic lesions, but also as an independent risk factor. The principal mechanisms involved are chronic hypoperfusion, microembolization and cerebrovascular reactivity impairment. Moreover, more recent studies showed alterations of regional functional connectivity. In this narrative review, we analyzed the relationships between carotid stenosis, cerebral hemodynamic derangement and cognitive impairment onset and progression, and underlined that cognitive impairment is the final result of the complex interaction between different elements, including also collateral circulation, cerebral hemodynamic status, brain connectivity and pro-inflammatory state. Further, therapeutic approaches, with a specific focus on vascular risk factors correction and on the effectiveness of surgical or endovascular interventions were discussed. We particularly focused our attention on the concept of “asymptomatic carotid stenosis”, and how could a cognitive impairment improve after an intervention, and how this could change the indications to surgical approach. Larger studies and randomized controlled trials are urgently required to better define time, characteristics and effectiveness of both medical and surgical/endovascular approaches.
Collapse
Affiliation(s)
| | - Lorenzo Falsetti
- Internal and Subintensive Medicine, Ospedali Riuniti Ancona, Italy
| | - Eleonora Potente
- Neurological Clinic, Marche Polytechnic University, Ancona, Italy
| | - Marco Bartolini
- Neurological Clinic, Marche Polytechnic University, Ancona, Italy
| | | |
Collapse
|
8
|
Viticchi G, Falsetti L, Buratti L, Acciarri MC, Emiliani A, Bartolini M, Silvestrini M. Carotid occlusion: Impact of cerebral hemodynamic impairment on cognitive performances. Int J Geriatr Psychiatry 2021; 36:197-206. [PMID: 32857468 DOI: 10.1002/gps.5414] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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] [Received: 02/08/2020] [Revised: 06/11/2020] [Accepted: 08/14/2020] [Indexed: 12/15/2022]
Abstract
OBJECTIVES The aim of this study was to investigate whether the presence of carotid artery occlusion (CO) may be associated with different cognitive performances in relation to the side of the occlusion and its hemodynamic consequences. METHODS During a 12-month period, 61 asymptomatic patients, 32 with right and 29 with left CO, were enrolled. Each patient underwent an assessment of cerebrovascular reactivity (CVR) to hypercapnia with transcranial Doppler (TCD) ultrasonography using the breath-holding index (BHI). Neuropsychological assessment evaluating performances of the hemisphere ipsilateral to CO were administered at entry (T0 ) and then repeated after 2 years (T1 ). RESULTS Scores obtained at colored progressive matrices (CPM) and Rey Complex Figure Copy Test were significantly lower at T0 in patients with reduced BHI values ipsilateral to CO. Multivariate models showed that reduced BHI values were also associated to a significant decrease from T0 to T1 in scores obtained for CPM and Categorical Verbal Fluency tests, respectively, in patients with right (P = 0.002) or left CO (P = 0.004). CONCLUSIONS These findings suggest that hemodynamic alterations could be involved in the reduction in cognitive function regulated by the hemisphere ipsilateral to CO. The assessment of CVR with TCD ultrasonography may be a reliable approach for the individuation of asymptomatic patients with CO at increased risk of cognitive deterioration.
Collapse
Affiliation(s)
| | - Lorenzo Falsetti
- Internal and Subintensive Medicine, Ospedali Riuniti, Ancona, Italy
| | - Laura Buratti
- Neurological Clinic, Marche Polytechnic University, Ancona, Italy
| | - Maria C Acciarri
- Neurological Clinic, Marche Polytechnic University, Ancona, Italy
| | - Andrea Emiliani
- Neurological Clinic, Marche Polytechnic University, Ancona, Italy
| | - Marco Bartolini
- Neurological Clinic, Marche Polytechnic University, Ancona, Italy
| | | |
Collapse
|
9
|
Tamborini D, Farzam P, Zimmermann B, Wu KC, Boas DA, Franceschini MA. Development and characterization of a multidistance and multiwavelength diffuse correlation spectroscopy system. Neurophotonics 2018; 5:011015. [PMID: 28948194 PMCID: PMC5607257 DOI: 10.1117/1.nph.5.1.011015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Accepted: 09/01/2017] [Indexed: 05/03/2023]
Abstract
This paper presents a multidistance and multiwavelength diffuse correlation spectroscopy (DCS) approach and its implementation to simultaneously measure the optical proprieties of deep tissue as well as the blood flow. The system consists of three long coherence length lasers at different wavelengths in the near-infrared, eight single-photon detectors, and a correlator board. With this approach, we collect both light intensity and DCS data at multiple distances and multiple wavelengths, which provide unique information to fit for all the parameters of interest: scattering, blood flow, and hemoglobin concentration. We present the characterization of the system and its validation with phantom measurements.
Collapse
Affiliation(s)
- Davide Tamborini
- Harvard Medical School, MGH/HST Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, Massachusetts, United States
- Address all correspondence to: Davide Tamborini, E-mail:
| | - Parisa Farzam
- Harvard Medical School, MGH/HST Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, Massachusetts, United States
| | - Bernhard Zimmermann
- Harvard Medical School, MGH/HST Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, Massachusetts, United States
| | - Kuan-Cheng Wu
- Harvard Medical School, MGH/HST Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, Massachusetts, United States
| | - David A. Boas
- Boston University, Boston University Neurophotonics Center, Boston, Massachusetts, United States
| | - Maria Angela Franceschini
- Harvard Medical School, MGH/HST Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, Massachusetts, United States
| |
Collapse
|
10
|
Liang Z, Gu Y, Duan X, Cheng L, Liang S, Tong Y, Li X. Design of multichannel functional near-infrared spectroscopy system with application to propofol and sevoflurane anesthesia monitoring. Neurophotonics 2016; 3:045001. [PMID: 27725946 PMCID: PMC5050277 DOI: 10.1117/1.nph.3.4.045001] [Citation(s) in RCA: 6] [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] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Accepted: 09/12/2016] [Indexed: 05/30/2023]
Abstract
Monitoring the changes of cerebral hemodynamics and the state of consciousness during general anesthesia (GA) is clinically important. There is a great need for developing advanced detectors to investigate the physiological processes of the brain during GA. We developed a multichanneled, functional near-infrared spectroscopy (fNIRS) system device and applied it to GA operation monitoring. The cerebral hemodynamic data from the forehead of 11 patients undergoing propofol and sevoflurane anesthesia were analyzed. The concentration changes of oxygenated hemoglobin, deoxygenated hemoglobin, total hemoglobin, and cerebral tissue heart rate were determined from the raw optical information based on the discrete stationary wavelet transform. This custom-made device provides an easy-to-build solution for continuous wave-fNIRS system, with customized specifications. The developed device has a potential value in cerebral monitoring in clinical settings.
Collapse
Affiliation(s)
- Zhenhu Liang
- Yanshan University, Institute of Electrical Engineering, No. 438 Hebei Street, Haigang District, Qinhuangdao 066004, China
| | - Yue Gu
- Yanshan University, Institute of Electrical Engineering, No. 438 Hebei Street, Haigang District, Qinhuangdao 066004, China
| | - Xuejing Duan
- Yanshan University, Institute of Electrical Engineering, No. 438 Hebei Street, Haigang District, Qinhuangdao 066004, China
| | - Lei Cheng
- Yanshan University, Institute of Electrical Engineering, No. 438 Hebei Street, Haigang District, Qinhuangdao 066004, China
| | - Shujuan Liang
- Department of Anesthesia, No. 1 Hospital of Qinhuangdao, No. 258 Wenhua Street, Haigang District, Qinhuangdao 066004, China
| | - Yunjie Tong
- McLean Hospital, McLean Imaging Center, 115 Mill Street, Belmont, Massachusetts 02478, United States
| | - Xiaoli Li
- Beijing Normal University, State Key Laboratory of Cognitive Neuroscience and Learning & IDG/McGovern Institute for Brain Research, No. 19 Xinjiekou Wai Street, Haidian District, Beijing 100875, China
- Beijing Normal University, Center for Collaboration and Innovation in Brain and Learning Sciences, No. 19 Xinjiekou Wai Street, Haidian District, Beijing 100875, China
| |
Collapse
|
11
|
Du C, Volkow ND, Koretsky AP, Pan Y. Low-frequency calcium oscillations accompany deoxyhemoglobin oscillations in rat somatosensory cortex. Proc Natl Acad Sci U S A 2014; 111:E4677-86. [PMID: 25313035 DOI: 10.1073/pnas.1410800111] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Spontaneous low-frequency oscillations (LFOs) of blood-oxygen-level-dependent (BOLD) signals are used to map brain functional connectivity with functional MRI, but their source is not well understood. Here we used optical imaging to assess whether LFOs from vascular signals covary with oscillatory intracellular calcium (Ca(2+)i) and with local field potentials in the rat's somatosensory cortex. We observed that the frequency of Ca(2+)i oscillations in tissue (∼0.07 Hz) was similar to the LFOs of deoxyhemoglobin (HbR) and oxyhemoglobin (HbO2) in both large blood vessels and capillaries. The HbR and HbO2 fluctuations within tissue correlated with Ca(2+)i oscillations with a lag time of ∼5-6 s. The Ca(2+)i and hemoglobin oscillations were insensitive to hypercapnia. In contrast, cerebral-blood-flow velocity (CBFv) in arteries and veins fluctuated at a higher frequency (∼0.12 Hz) and was sensitive to hypercapnia. However, in parenchymal tissue, CBFv oscillated with peaks at both ∼0.06 Hz and ∼0.12 Hz. Although the higher-frequency CBFv oscillation (∼0.12 Hz) was decreased by hypercapnia, its lower-frequency component (∼0.06 Hz) was not. The sensitivity of the higher CBFV oscillations to hypercapnia, which triggers blood vessel vasodilation, suggests its dependence on vascular effects that are distinct from the LFOs detected in HbR, HbO2, Ca(2+)i, and the lower-frequency tissue CBFv, which were insensitive to hypercapnia. Hemodynamic LFOs correlated both with Ca(2+)i and neuronal firing (local field potentials), indicating that they directly reflect neuronal activity (perhaps also glial). These findings show that HbR fluctuations (basis of BOLD oscillations) are linked to oscillatory cellular activity and detectable throughout the vascular tree (arteries, capillaries, and veins).
Collapse
|
12
|
Jiménez Caballero PE, Coloma Navarro R, Segura Martín T, Ayo Martín O. Cerebral hemodynamic changes at basilar artery in patients with obstructive sleep apnea syndrome. A case-control study. Acta Neurol Scand 2014; 129:80-4. [PMID: 23763490 DOI: 10.1111/ane.12156] [Citation(s) in RCA: 8] [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] [Accepted: 05/07/2013] [Indexed: 11/30/2022]
Abstract
INTRODUCTION Obstructive sleep apnea syndrome (OSAS) is characterized in polysomnography by recurrent airflow obstruction during sleep. The underlying pathogenic mechanisms of neuropsychological and cerebrovascular events in patients with OSAS have not been clarified unequivocally. MATERIAL AND METHODS Case-control study to evaluate the cerebral vasomotor reactivity assessed by breath-holding maneuver at basilar artery in patients with OSAS compared to control subjects. RESULTS The study included 76 patients with OSAS and 76 controls. Vascular risk factors (arterial hypertension, diabetes mellitus, hypercholesterolemia, smoking), age, gender, coronary, and peripheral arterial diseases were similar in both groups. Patients with OSAS had breath-holding test values (31.9 ± 13.35%) lower than controls (39.06 ± 13.16%), (P = 0.001). Patients with OSAS had higher systolic and diastolic blood pressure both basal and apnea and also a higher basal heart rate. CONCLUSIONS Altered cerebral hemodynamics together with increased blood pressure values in patients with OSAS may play a role in the association between this disease and the development of cerebrovascular events. This implies that this disease should be identified through guide symptoms such as snoring, sleep apnea, and daytime sleepiness in all patients who consult for these symptoms to reduce the number of cerebrovascular events.
Collapse
Affiliation(s)
| | | | | | - O. Ayo Martín
- Complejo Hospitalario Universitario de Albacete; Albacete Spain
| |
Collapse
|
13
|
Rupp T, Esteve F, Bouzat P, Lundby C, Perrey S, Levy P, Robach P, Verges S. Cerebral hemodynamic and ventilatory responses to hypoxia, hypercapnia, and hypocapnia during 5 days at 4,350 m. J Cereb Blood Flow Metab 2014; 34:52-60. [PMID: 24064493 PMCID: PMC3887348 DOI: 10.1038/jcbfm.2013.167] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [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] [Received: 05/23/2013] [Revised: 07/31/2013] [Accepted: 08/26/2013] [Indexed: 01/18/2023]
Abstract
This study investigated the changes in cerebral near-infrared spectroscopy (NIRS) signals, cerebrovascular and ventilatory responses to hypoxia and CO2 during altitude exposure. At sea level (SL), after 24 hours and 5 days at 4,350 m, 11 healthy subjects were exposed to normoxia, isocapnic hypoxia, hypercapnia, and hypocapnia. The following parameters were measured: prefrontal tissue oxygenation index (TOI), oxy- (HbO2), deoxy- and total hemoglobin (HbTot) concentrations with NIRS, blood velocity in the middle cerebral artery (MCAv) with transcranial Doppler and ventilation. Smaller prefrontal deoxygenation and larger ΔHbTot in response to hypoxia were observed at altitude compared with SL (day 5: ΔHbO2-0.6±1.1 versus -1.8±1.3 μmol/cmper mm Hg and ΔHbTot 1.4±1.3 versus 0.7±1.1 μmol/cm per mm Hg). The hypoxic MCAv and ventilatory responses were enhanced at altitude. Prefrontal oxygenation increased less in response to hypercapnia at altitude compared with SL (day 5: ΔTOI 0.3±0.2 versus 0.5±0.3% mm Hg). The hypercapnic MCAv and ventilatory responses were decreased and increased, respectively, at altitude. Hemodynamic responses to hypocapnia did not change at altitude. Short-term altitude exposure improves cerebral oxygenation in response to hypoxia but decreases it during hypercapnia. Although these changes may be relevant for conditions such as exercise or sleep at altitude, they were not associated with symptoms of acute mountain sickness.
Collapse
Affiliation(s)
- Thomas Rupp
- 1] INSERM U1042, Grenoble, France [2] HP2 laboratory, Joseph Fourier University, Grenoble, France
| | - François Esteve
- 1] U836/team 6, INSERM, Grenoble, France [2] Grenoble Institute of Neurosciences, Joseph Fourier University, Grenoble, France
| | - Pierre Bouzat
- 1] U836/team 6, INSERM, Grenoble, France [2] Grenoble Institute of Neurosciences, Joseph Fourier University, Grenoble, France
| | - Carsten Lundby
- Institute of Physiology, University of Zurich, Zurich, Switzerland
| | - Stéphane Perrey
- Movement To Health (M2H), Montpellier-1 University, Euromov, France
| | - Patrick Levy
- 1] INSERM U1042, Grenoble, France [2] HP2 laboratory, Joseph Fourier University, Grenoble, France
| | - Paul Robach
- 1] INSERM U1042, Grenoble, France [2] HP2 laboratory, Joseph Fourier University, Grenoble, France [3] Ecole Nationale de Ski et d'Alpinisme, Chamonix, France
| | - Samuel Verges
- 1] INSERM U1042, Grenoble, France [2] HP2 laboratory, Joseph Fourier University, Grenoble, France
| |
Collapse
|