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Zhu Y, Li Q, Wu Y, Peng X, Xiang X, Lau B, Tzang F, Liu L, Li T. Protective Effect of Modified Hemoglobin on Rabbits and Goats in High-Altitude Sickness. Adv Biol (Weinh) 2023; 7:e2200307. [PMID: 37097708 DOI: 10.1002/adbi.202200307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 02/06/2023] [Indexed: 04/26/2023]
Abstract
The prevalence and severity of high-altitude sickness increases with increasing altitude. Prevention of hypoxia caused by high-altitude sickness is an urgent problem. As a novel oxygen-carrying fluid, modified hemoglobin can carry oxygen in a full oxygen partial pressure environment and release oxygen in a low oxygen partial pressure environment. It is unclear whether modified hemoglobin can improve hypoxic injury on a plateau. Using hypobaric chamber rabbit (5000 m) and plateau goat (3600 m) models, general behavioral scores and vital signs, hemodynamic, vital organ functions, and blood gas are measured. The results show that the general behavioral scores and vital signs decrease significantly in the hypobaric chamber or plateau, and the modified hemoglobin can effectively improve the general behavioral scores and vital signs in rabbits and goats, and reduce the degree of damage to vital organs. Further studies reveal that arterial partial pressure of oxygen (PaO2 ) and arterial oxygen saturation (SaO2 ) on the plateau decrease rapidly, and the modified hemoglobin could increase PaO2 and SaO2 ; thus, increasing the oxygen-carrying capacity. Moreover, modified hemoglobin has few side effects on hemodynamics and kidney injury. These results indicate that modified hemoglobin has a protective effect against high-altitude sickness.
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Affiliation(s)
- Yu Zhu
- State Key Laboratory of Trauma, Burns, and Combined Injury, Department of Shock and Transfusion, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, 400042, China
| | - Qinghui Li
- State Key Laboratory of Trauma, Burns, and Combined Injury, Department of Shock and Transfusion, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, 400042, China
| | - Yue Wu
- State Key Laboratory of Trauma, Burns, and Combined Injury, Department of Shock and Transfusion, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, 400042, China
| | - Xiaoyong Peng
- State Key Laboratory of Trauma, Burns, and Combined Injury, Department of Shock and Transfusion, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, 400042, China
| | - Xinming Xiang
- State Key Laboratory of Trauma, Burns, and Combined Injury, Department of Shock and Transfusion, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, 400042, China
| | - Billy Lau
- New Beta Innovation Limited, Kowloon Bay, Hong Kong, Hong Kong SAR, 999077, China
| | - Feichuen Tzang
- New Beta Innovation Limited, Kowloon Bay, Hong Kong, Hong Kong SAR, 999077, China
| | - Liangming Liu
- State Key Laboratory of Trauma, Burns, and Combined Injury, Department of Shock and Transfusion, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, 400042, China
| | - Tao Li
- State Key Laboratory of Trauma, Burns, and Combined Injury, Department of Shock and Transfusion, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, 400042, China
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Zhong M, Zeng H, Wang D, Li J, Duan X, Li Y. Structure and activity alteration in adult highland residents' cerebrum: Voxel-based morphometry and amplitude of low-frequency fluctuation study. Front Neurosci 2022; 16:1035308. [PMID: 36507327 PMCID: PMC9730815 DOI: 10.3389/fnins.2022.1035308] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Accepted: 10/31/2022] [Indexed: 11/25/2022] Open
Abstract
Introduction People living in highland areas may have factors that allow them to adapt to chronic hypoxia, but these physiological mechanisms remain unclear. This study aimed to investigate the brain mechanism in a cohort of adult residents of Tibet, a well-known plateau section in China, by observing differences in brain structure and function in non-plateau populations. Methods The study included 27 Tibetan and 27 non-plateau region residents who were matched in age, sex, and education. All participants underwent high-resolution three-dimensional T1 weighted imaging (3D-T1WI) and resting-state functional magnetic resonance imaging (rs-fMRI) scans on a 1.5 Tesla MR. Gray matter volumes and regional spontaneous neuronal activity (SNA) were calculated and compared between the two groups. Results When comparing gray matter in people living in high altitudes to those living in the flatlands, the results showed positive activation of gray matter in local brain regions (p < 0.05, false discovery rate (FDR) corrected), in the right postcentral [automated atomic labeling (aal)], left postcentral (aal), and right lingual (aal) regions. Comparing the people of high altitude vs. flat land in the brain function study (p < 0.05, FDR corrected), positive activation was found in the right superior motor area (aal) and left superior frontal (aal), and negative activation was found in the right precuneus (aal). Conclusion In high-altitude individuals, larger regional gray matter volumes and higher SNA may represent a compensatory mechanism to adapt to chronic hypoxia.
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Affiliation(s)
- Minzhi Zhong
- Department of Radiology, Guangzhou Red Cross Hospital, Guangzhou, China
| | - Huaqu Zeng
- Department of Radiotherapy Center, Gaozhou People's Hospital, Guangdong, China
| | - Dongye Wang
- Department of Radiology, Sun Yat-sen Memorial Hospital, Guangzhou, China
| | - Jiesheng Li
- Department of Radiology, Sanshui People's Hospital, Foshan, China
| | - Xuguang Duan
- Department of Radiology, Nyingchi People's Hospital of Tibet Autonomous Region, Nyingchi, China
| | - Yong Li
- Department of Radiology, Sun Yat-sen Memorial Hospital, Guangzhou, China
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Insight into the Effects of High-Altitude Hypoxic Exposure on Learning and Memory. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2022; 2022:4163188. [PMID: 36160703 PMCID: PMC9492407 DOI: 10.1155/2022/4163188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Accepted: 08/22/2022] [Indexed: 02/05/2023]
Abstract
The earth land area is heterogeneous in terms of elevation; about 45% of its land area belongs to higher elevation with altitude above 500 meters compared to sea level. In most cases, oxygen concentration decreases as altitude increases. Thus, high-altitude hypoxic stress is commonly faced by residents in areas with an average elevation exceeding 2500 meters and those who have just entered the plateau. High-altitude hypoxia significantly affects advanced neurobehaviors including learning and memory (L&M). Hippocampus, the integration center of L&M, could be the most crucial target affected by high-altitude hypoxia exposure. Based on these points, this review thoroughly discussed the relationship between high-altitude hypoxia and L&M impairment, in terms of hippocampal neuron apoptosis and dysfunction, neuronal oxidative stress disorder, neurotransmitters and related receptors, and nerve cell energy metabolism disorder, which is of great significance to find potential targets for medical intervention. Studies illustrate that the mechanism of L&M damaged by high-altitude hypoxia should be further investigated based on the entire review of issues related to this topic.
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Xing C, Gao Y, Wang X, Xing W, Liu Y, Lei Y, Zhang X, Zhang S, Yuan L, Gao F. Cuff-Method Thigh Arterial Occlusion Counteracts Cerebral Hypoperfusion Against the Push-Pull Effect in Humans. Front Physiol 2021; 12:672351. [PMID: 34220534 PMCID: PMC8243772 DOI: 10.3389/fphys.2021.672351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Accepted: 04/29/2021] [Indexed: 11/24/2022] Open
Abstract
Exposure to acute transition from negative (−Gz) to positive (+ Gz) gravity significantly impairs cerebral perfusion in pilots of high-performance aircraft during push—pull maneuver. This push—pull effect may raise the risk for loss of vision or consciousness. The aim of the present study was to explore effective countermeasures against cerebral hypoperfusion induced by the push—pull effect. Twenty healthy young volunteers (male, 21 ± 1 year old) were tested during the simulated push–pull maneuver by tilting. A thigh cuff (TC) pressure of 200 mmHg was applied before and during simulated push—pull maneuver (−0.87 to + 1.00 Gz). Beat-to-beat cerebral and systemic hemodynamics were measured continuously. During rapid −Gz to + Gz transition, mean cerebral blood flow velocity (CBFV) was decreased, but to a lesser extent, in the TC bout compared with the control bout (−3.1 ± 4.9 vs. −7.8 ± 4.4 cm/s, P < 0.001). Similarly, brain-level mean blood pressure showed smaller reduction in the TC bout than in the control bout (−46 ± 12 vs. −61 ± 13 mmHg, P < 0.001). The systolic CBFV was lower but diastolic CBFV was higher in the TC bout. The systemic blood pressure response was blunted in the TC bout, along with similar heart rate increase, smaller decrease, and earlier recovery of total peripheral resistance index than control during the gravitational transition. These data demonstrated that restricting thigh blood flow can effectively mitigate the transient cerebral hypoperfusion induced by rapid shift from −Gz to + Gz, characterized by remarkable improvement of cerebral diastolic flow.
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Affiliation(s)
- Changyang Xing
- School of Aerospace Medicine, Fourth Military Medical University, Xi'an, China.,Department of Ultrasound Diagnostics, Tangdu Hospital, Fourth Military Medical University, Xi'an, China
| | - Yuan Gao
- School of Aerospace Medicine, Fourth Military Medical University, Xi'an, China
| | - Xinpei Wang
- School of Aerospace Medicine, Fourth Military Medical University, Xi'an, China
| | - Wenjuan Xing
- School of Aerospace Medicine, Fourth Military Medical University, Xi'an, China
| | - Yunnan Liu
- Department of Ultrasound Diagnostics, Tangdu Hospital, Fourth Military Medical University, Xi'an, China
| | - Yujia Lei
- Department of Ultrasound Diagnostics, Tangdu Hospital, Fourth Military Medical University, Xi'an, China
| | - Xing Zhang
- School of Aerospace Medicine, Fourth Military Medical University, Xi'an, China
| | - Shu Zhang
- School of Aerospace Medicine, Fourth Military Medical University, Xi'an, China
| | - Lijun Yuan
- Department of Ultrasound Diagnostics, Tangdu Hospital, Fourth Military Medical University, Xi'an, China
| | - Feng Gao
- School of Aerospace Medicine, Fourth Military Medical University, Xi'an, China
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Xing C, Wang X, Gao Y, Zhang J, Liu Y, Guo Y, Wang C, Feng Y, Lei Y, Zhang X, Li J, Hu W, Zhang S, Yuan L, Gao F. Lower body negative pressure protects brain perfusion in aviation gravitational stress induced by push-pull manoeuvre. J Physiol 2020; 598:3173-3186. [PMID: 32415785 DOI: 10.1113/jp279876] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Accepted: 05/12/2020] [Indexed: 01/12/2023] Open
Abstract
KEY POINTS Rapid alterations of gravitational stress during high-performance aircraft push-pull manoeuvres induce dramatic shifts in volume and pressure within the circulation system, which may result in loss of consciousness due to the rapid and significant reduction in cerebral perfusion. There are still no specific and effective countermeasures so far. We found that lower body negative pressure (LBNP), applied prior to and during -Gz and released at the subsequent transition to +Gz, could effectively counteract gravitational haemodynamic stress induced by a simulated push-pull manoeuvre and improve cerebral diastolic perfusion in human subjects. We developed a LBNP strategy that effectively protects cerebral perfusion at rapid -Gz to +Gz transitions via improving cerebral blood flow and blood pressure during push-pull manoeuvres and highlight the importance of the timing of the intervention. Our findings provide a systemic link of integrated responses between the peripheral and cerebral haemodynamic changes during push-pull manoeuvres. ABSTRACT The acute negative (-Gz) to positive (+Gz) gravity stress during high-performance aircraft push-pull manoeuvres dramatically reduces transient cerebral perfusion, which may lead to loss of vision or even consciousness. The aim of this study was to explore a specific and effective counteractive strategy. Twenty-three healthy young male volunteers (age 21 ± 1 year) were subjected to tilting-simulated push-pull manoeuvres. Lower body negative pressure (LBNP) of -40 mmHg was applied prior to and during -Gz stress (-0.50 or -0.87 Gz) and released at the subsequent transition to +1.00 Gz stress. Beat-to-beat cerebral and systemic haemodynamics were continuously recorded during the simulated push-pull manoeuvre in LBNP bouts and corresponding control bouts. During the rapid gravitational transition from -Gz to +Gz, the mean cerebral blood flow velocity decreased significantly in control bouts, while it increased in LBNP bouts (control vs. LBNP bouts, -6.6 ± 4.6 vs. 5.1 ± 6.8 cm s-1 for -0.50 Gz, and -7.4 ± 4.8 vs. 3.4 ± 4.6 cm s-1 for -0.87 Gz, P < 0.01), which was attributed mainly to the elevation of diastolic flow. The LBNP bouts showed much smaller reduction of mean arterial blood pressure at the brain level than control bouts (control bouts vs. LBNP bouts, -38 ± 12 vs. -23 ± 10 mmHg for -0.50 to +1.00 Gz, and -62 ± 16 vs. -43 ± 11 mmHg for -0.87 to +1.00 Gz, P < 0.01). LBNP applied at -Gz and released at subsequent +Gz had biphasic counteractive effects against the gravitational responses to the push-pull manoeuvre. These data demonstrate that this LBNP strategy could effectively protect cerebral perfusion with dominant improvement of diastolic flow during push-pull manoeuvres.
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Affiliation(s)
- Changyang Xing
- School of Aerospace Medicine, Fourth Military Medical University, Xi'an, 710032, China.,Department of Ultrasound Diagnostics, Tangdu Hospital, Fourth Military Medical University, Xi'an, 710038, China
| | - Xinpei Wang
- School of Aerospace Medicine, Fourth Military Medical University, Xi'an, 710032, China
| | - Yuan Gao
- School of Aerospace Medicine, Fourth Military Medical University, Xi'an, 710032, China
| | - Jiaxin Zhang
- School of Aerospace Medicine, Fourth Military Medical University, Xi'an, 710032, China
| | - Yunnan Liu
- Department of Ultrasound Diagnostics, Tangdu Hospital, Fourth Military Medical University, Xi'an, 710038, China
| | - Yitong Guo
- Department of Ultrasound Diagnostics, Tangdu Hospital, Fourth Military Medical University, Xi'an, 710038, China
| | - Chen Wang
- Department of Ultrasound Diagnostics, Tangdu Hospital, Fourth Military Medical University, Xi'an, 710038, China
| | - Yang Feng
- Department of Ultrasound Diagnostics, Tangdu Hospital, Fourth Military Medical University, Xi'an, 710038, China
| | - Yujia Lei
- Department of Ultrasound Diagnostics, Tangdu Hospital, Fourth Military Medical University, Xi'an, 710038, China
| | - Xing Zhang
- School of Aerospace Medicine, Fourth Military Medical University, Xi'an, 710032, China
| | - Jia Li
- School of Aerospace Medicine, Fourth Military Medical University, Xi'an, 710032, China
| | - Wendong Hu
- School of Aerospace Medicine, Fourth Military Medical University, Xi'an, 710032, China
| | - Shu Zhang
- School of Aerospace Medicine, Fourth Military Medical University, Xi'an, 710032, China
| | - Lijun Yuan
- Department of Ultrasound Diagnostics, Tangdu Hospital, Fourth Military Medical University, Xi'an, 710038, China
| | - Feng Gao
- School of Aerospace Medicine, Fourth Military Medical University, Xi'an, 710032, China
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