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  1. Article ; Online: Reply from Ryan L. Hoiland and Philip N. Ainslie.

    Hoiland, Ryan L / Ainslie, Philip N

    The Journal of physiology

    2017  Volume 595, Issue 11, Page(s) 3673–3675

    MeSH term(s) Arteries ; Cyclooxygenase 2 ; Indomethacin ; Prostaglandins
    Chemical Substances Prostaglandins ; Cyclooxygenase 2 (EC 1.14.99.1) ; Indomethacin (XXE1CET956)
    Language English
    Publishing date 2017-02-06
    Publishing country England
    Document type Letter ; Comment
    ZDB-ID 3115-x
    ISSN 1469-7793 ; 0022-3751
    ISSN (online) 1469-7793
    ISSN 0022-3751
    DOI 10.1113/JP274100
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Rebuttal from Ryan L. Hoiland and Philip N. Ainslie.

    Hoiland, Ryan L / Ainslie, Philip N

    The Journal of physiology

    2016  Volume 594, Issue 15, Page(s) 4081

    Language English
    Publishing date 2016-08-01
    Publishing country England
    Document type Journal Article
    ZDB-ID 3115-x
    ISSN 1469-7793 ; 0022-3751
    ISSN (online) 1469-7793
    ISSN 0022-3751
    DOI 10.1113/JP272241
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Performing under pressure: hypertension and the regulation of cerebral oxygen delivery.

    Hoiland, Ryan L

    The Journal of physiology

    2018  Volume 596, Issue 7, Page(s) 1129–1130

    MeSH term(s) Animals ; Blood Pressure ; Cerebrovascular Circulation ; Humans ; Hypertension/physiopathology ; Oxygen/metabolism ; Oxygen Consumption
    Chemical Substances Oxygen (S88TT14065)
    Language English
    Publishing date 2018-03-05
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 3115-x
    ISSN 1469-7793 ; 0022-3751
    ISSN (online) 1469-7793
    ISSN 0022-3751
    DOI 10.1113/JP275984
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Impact of Skin Pigmentation on Cerebral Regional Saturation of Oxygen Using Near-Infrared Spectroscopy: A Systematic Review.

    Patel, Nikunj A / Bhattal, Harvir S / Griesdale, Donald E / Hoiland, Ryan L / Sekhon, Mypinder S

    Critical care explorations

    2024  Volume 6, Issue 2, Page(s) e1049

    Abstract: Objectives: Near-infrared spectroscopy (NIRS) is used in critical care settings to measure regional cerebral tissue oxygenation (rSo: Data sources: We systematically searched MEDLINE, Cochrane Database of Systematic Reviews, Embase, and Google ... ...

    Abstract Objectives: Near-infrared spectroscopy (NIRS) is used in critical care settings to measure regional cerebral tissue oxygenation (rSo
    Data sources: We systematically searched MEDLINE, Cochrane Database of Systematic Reviews, Embase, and Google Scholar from inception to July 1, 2023.
    Study selection: In compliance with our PROSPERO registration (CRD42022347548), we selected articles comparing rSo
    Data extraction: We extracted data on self-reported race or level of skin pigmentation and mean rSo
    Data synthesis: Of the 11,495 unique records screened, two studies (
    Conclusions: Skin pigmentation likely results in attenuated rSo
    Language English
    Publishing date 2024-02-12
    Publishing country United States
    Document type Journal Article ; Review
    ISSN 2639-8028
    ISSN (online) 2639-8028
    DOI 10.1097/CCE.0000000000001049
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Shining a light on cerebral autoregulation: Are we anywhere near the truth?

    Bird, Jordan D / MacLeod, David B / Griesdale, Donald E / Sekhon, Mypinder S / Hoiland, Ryan L

    Journal of cerebral blood flow and metabolism : official journal of the International Society of Cerebral Blood Flow and Metabolism

    2024  , Page(s) 271678X241245488

    Abstract: The near-infrared spectroscopy (NIRS)-derived cerebral oximetry index (COx) has become popularized for non-invasive neuromonitoring of cerebrovascular function in post-cardiac arrest patients with hypoxic-ischemic brain injury (HIBI). We provide ... ...

    Abstract The near-infrared spectroscopy (NIRS)-derived cerebral oximetry index (COx) has become popularized for non-invasive neuromonitoring of cerebrovascular function in post-cardiac arrest patients with hypoxic-ischemic brain injury (HIBI). We provide commentary on the physiologic underpinnings and assumptions of NIRS and the COx, potential confounds in the context of HIBI, and the implications for the assessment of cerebral autoregulation.
    Language English
    Publishing date 2024-04-11
    Publishing country United States
    Document type Journal Article
    ZDB-ID 604628-9
    ISSN 1559-7016 ; 0271-678X
    ISSN (online) 1559-7016
    ISSN 0271-678X
    DOI 10.1177/0271678X241245488
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: The importance of the oxygen cascade after cardiac arrest.

    Sekhon, Mypinder S / Hoiland, Ryan L / Griesdale, Donald E

    Resuscitation

    2021  Volume 168, Page(s) 231–233

    MeSH term(s) Cardiopulmonary Resuscitation ; Heart Arrest/therapy ; Humans ; Oxygen
    Chemical Substances Oxygen (S88TT14065)
    Language English
    Publishing date 2021-09-27
    Publishing country Ireland
    Document type Editorial ; Research Support, Non-U.S. Gov't ; Comment
    ZDB-ID 189901-6
    ISSN 1873-1570 ; 0300-9572
    ISSN (online) 1873-1570
    ISSN 0300-9572
    DOI 10.1016/j.resuscitation.2021.09.017
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Zs.A 1048: Show issues Location:
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  7. Article ; Online: The jugular venous-to-arterial

    Carr, Jay M J R / Day, Trevor A / Ainslie, Philip N / Hoiland, Ryan L

    The Journal of physiology

    2023  Volume 601, Issue 19, Page(s) 4251–4262

    Abstract: We examined two assumptions of the modified rebreathing technique for the assessment of the ventilatory central chemoreflex (CCR) and cerebrovascular ... ...

    Abstract We examined two assumptions of the modified rebreathing technique for the assessment of the ventilatory central chemoreflex (CCR) and cerebrovascular CO
    MeSH term(s) Humans ; Carbon Dioxide ; Jugular Veins ; Hypercapnia ; Middle Cerebral Artery/physiology ; Cerebrovascular Circulation/physiology
    Chemical Substances Carbon Dioxide (142M471B3J)
    Language English
    Publishing date 2023-08-28
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 3115-x
    ISSN 1469-7793 ; 0022-3751
    ISSN (online) 1469-7793
    ISSN 0022-3751
    DOI 10.1113/JP284449
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Invasive neuromonitoring post-cardiac arrest: Key considerations.

    Hoiland, Ryan L / Griesdale, Donald E / Sekhon, Mypinder S

    Resuscitation

    2021  Volume 164, Page(s) 144–146

    MeSH term(s) Brain Injuries ; Heart Arrest/therapy ; Humans ; Hypoxia-Ischemia, Brain ; Intracranial Pressure
    Language English
    Publishing date 2021-05-14
    Publishing country Ireland
    Document type Editorial ; Research Support, Non-U.S. Gov't ; Comment
    ZDB-ID 189901-6
    ISSN 1873-1570 ; 0300-9572
    ISSN (online) 1873-1570
    ISSN 0300-9572
    DOI 10.1016/j.resuscitation.2021.05.003
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Recent insights into mechanisms of hypoxia-induced vasodilatation in the human brain.

    Carr, Jay M J R / Hoiland, Ryan L / Fernandes, Igor A / Schrage, William G / Ainslie, Philip N

    The Journal of physiology

    2023  

    Abstract: The cerebral vasculature manages oxygen delivery by adjusting arterial blood in-flow in the face of reductions in oxygen availability. Hypoxic cerebral vasodilatation, and the associated hypoxic cerebral blood flow reactivity, involve many vascular, ... ...

    Abstract The cerebral vasculature manages oxygen delivery by adjusting arterial blood in-flow in the face of reductions in oxygen availability. Hypoxic cerebral vasodilatation, and the associated hypoxic cerebral blood flow reactivity, involve many vascular, erythrocytic and cerebral tissue mechanisms that mediate elevations in cerebral blood flow via micro- and macrovascular dilatation. This contemporary review focuses on in vivo human work - with reference to seminal preclinical work where necessary - on hypoxic cerebrovascular reactivity, particularly where recent advancements have been made. We provide updates with the following information: in humans, hypoxic cerebral vasodilatation is partially mediated via a - likely non-obligatory - combination of: (1) nitric oxide synthases, (2) deoxygenation-coupled S-nitrosothiols, (3) potassium channel-related vascular smooth muscle hyperpolarization, and (4) prostaglandin mechanisms with some contribution from an interrelationship with reactive oxygen species. And finally, we discuss the fact that, due to the engagement of deoxyhaemoglobin-related mechanisms, reductions in O
    Language English
    Publishing date 2023-09-01
    Publishing country England
    Document type Journal Article
    ZDB-ID 3115-x
    ISSN 1469-7793 ; 0022-3751
    ISSN (online) 1469-7793
    ISSN 0022-3751
    DOI 10.1113/JP284608
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Clinical targeting of the cerebral oxygen cascade to improve brain oxygenation in patients with hypoxic-ischaemic brain injury after cardiac arrest.

    Hoiland, Ryan L / Robba, Chiara / Menon, David K / Citerio, Giuseppe / Sandroni, Claudio / Sekhon, Mypinder S

    Intensive care medicine

    2023  Volume 49, Issue 9, Page(s) 1062–1078

    Abstract: The cerebral oxygen cascade includes three key stages: (a) convective oxygen delivery representing the bulk flow of oxygen to the cerebral vascular bed; (b) diffusion of oxygen from the blood into brain tissue; and (c) cellular utilisation of oxygen for ... ...

    Abstract The cerebral oxygen cascade includes three key stages: (a) convective oxygen delivery representing the bulk flow of oxygen to the cerebral vascular bed; (b) diffusion of oxygen from the blood into brain tissue; and (c) cellular utilisation of oxygen for aerobic metabolism. All three stages may become dysfunctional after resuscitation from cardiac arrest and contribute to hypoxic-ischaemic brain injury (HIBI). Improving convective cerebral oxygen delivery by optimising cerebral blood flow has been widely investigated as a strategy to mitigate HIBI. However, clinical trials aimed at optimising convective oxygen delivery have yielded neutral results. Advances in the understanding of HIBI pathophysiology suggest that impairments in the stages of the oxygen cascade pertaining to oxygen diffusion and cellular utilisation of oxygen should also be considered in identifying therapeutic strategies for the clinical management of HIBI patients. Culprit mechanisms for these impairments may include a widening of the diffusion barrier due to peri-vascular oedema and mitochondrial dysfunction. An integrated approach encompassing both intra-parenchymal and non-invasive neuromonitoring techniques may aid in detecting pathophysiologic changes in the oxygen cascade and enable patient-specific management aimed at reducing the severity of HIBI.
    MeSH term(s) Humans ; Oxygen ; Brain ; Hypoxia-Ischemia, Brain/therapy ; Heart Arrest/complications ; Heart Arrest/therapy ; Cerebrovascular Circulation/physiology ; Brain Injuries/metabolism
    Chemical Substances Oxygen (S88TT14065)
    Language English
    Publishing date 2023-07-28
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 80387-x
    ISSN 1432-1238 ; 0340-0964 ; 0342-4642 ; 0935-1701
    ISSN (online) 1432-1238
    ISSN 0340-0964 ; 0342-4642 ; 0935-1701
    DOI 10.1007/s00134-023-07165-x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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