Component

Regional cerebral blood flow

Regional cerebral blood flow. Species, exposure and limitations are retained in each linked claim.

4 recorded relationships. Experimental role, claim status and evidence remain attached to each record.

Read recorded mechanisms Open recursive mind map

How nutrients influence it

Every nutrient with a recorded effect on this component, credited to the nutrient that acted rather than the chapter that recorded it. Open a nutrient to see the findings and the conditions they were measured under.

How nutrients reach it in more than one step

Chains of two or more recorded steps that end here, grouped by the nutrient they start from. Each step is a separate finding, so a chain is a route a mechanism could take, not proof that it does.

Tracing routes…

What it does

Every recorded relationship this component is part of, grouped by its role. Plain wording comes first; the technical statement follows.

Recorded relationships

What acts on it

  1. After 30 minutes at 5 ATA, regional cerebral blood flow fell by 23 to 37% in substantia nigra, caudate putamen, hippocampus and parietal cortex.

    Hyperbaric oxygen therapy → Regional cerebral blood flow source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/hbot-research/11139368.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "9823a7f177483257b812d7c8c8e8052c3f04d6a7aa052876369c7c64b55668f3", "start_char": 0, "end_char": 1672, "text_sha256": "9823a7f177483257b812d7c8c8e8052c3f04d6a7aa052876369c7c64b55668f3"}
    experimental_model
    Regional cerebral blood flow measurement in rats with nitric oxide metabolite and hydroxyl radical assays
    exposure
    Oxygen at 5 atmospheres absolute for 30 minutes, with L-NAME, a nitric oxide donor, or intravascular superoxide dismutase
    limitations
    Five atmospheres is well above therapeutic pressure and was chosen to study oxygen toxicity. The superoxide dismutase rescue is the key mechanistic step.
    nutrient_topic
    Hyperbaric oxygen research collection; topical membership is not evidence of a direct clinical effect, and a therapeutic exposure is not a dietary intake. · Hyperbaric oxygen therapy
    organism
    Rat
    plain_language
    Breathing oxygen under pressure narrows brain vessels rather than flooding them.
    primary_references
    [hbot-p11139368] Hyperbaric oxygen reduces cerebral blood flow by inactivating nitric oxide. (2000). https://pubmed.ncbi.nlm.nih.gov/11139368/ DOI: 10.1006/niox.2000.0313
    tissue_or_cell_type
    Brain

    Hyperbaric oxygen: the exposure, its reactive species, the signals they carry, and the nutrient-dependent enzymes that handle them (2026-09-19) · lines 153–164

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Regional cerebral blood flow measurement in rats with nitric oxide metabolite and hydroxyl radical assays · source_derived_draft · unverified_draft

    ### hbot-cbf-reduction After 30 minutes at 5 ATA, regional cerebral blood flow fell by 23 to 37% in substantia nigra, caudate putamen, hippocampus and parietal cortex. Condition category: normal nutrient_topic: Hyperbaric oxygen research collection; topical membership is not evidence of a direct clinical effect, and a therapeutic exposure is not a dietary intake. plain_language: Breathing oxygen under pressure narrows brain vessels rather than flooding them. organism: Rat tissue_or_cell_type: Brain experimental_model: Regional cerebral blood flow measurement in rats with nitric oxide metabolite and hydroxyl radical assays limitations: Five atmospheres is well above therapeutic pressure and was chosen to study oxygen toxicity. The superoxide dismutase rescue is the key mechanistic step. exposure: Oxygen at 5 atmospheres absolute for 30 minutes, with L-NAME, a nitric oxide donor, or intravascular superoxide dismutase evidence_span: {"source_cache": "artifacts/hbot-research/11139368.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "9823a7f177483257b812d7c8c8e8052c3f04d6a7aa052876369c7c64b55668f3", "start_char": 0, "end_char": 1672, "text_sha256": "9823a7f177483257b812d7c8c8e8052c3f04d6a7aa052876369c7c64b55668f3"} [hbot-p11139368] Hyperbaric oxygen reduces cerebral blood flow by inactivating nitric oxide. (2000). https://pubmed.ncbi.nlm.nih.gov/11139368/ DOI: 10.1006/niox.2000.0313
    Complete structured claim and evidence

  2. Blood flow fell by 26 to 43% at 3 and 4 ATA, but at 5 ATA it fell over 30 minutes then gradually returned to pre-exposure levels, preceding the onset of electroencephalographic spiking.

    Hyperbaric oxygen therapy → Regional cerebral blood flow source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/hbot-research/10749833.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "1470d09e77b6d6f6af3131a6f7db2cca647dde3655662a1c83f9d5d375f1c687", "start_char": 0, "end_char": 1283, "text_sha256": "1470d09e77b6d6f6af3131a6f7db2cca647dde3655662a1c83f9d5d375f1c687"}
    experimental_model
    Regional cerebral blood flow and electroencephalography in anaesthetised rats
    exposure
    Oxygen at 1, 3, 4 and 5 ATA with L-NAME, L-arginine, nitric oxide donors or MK-801
    limitations
    A time-course study at toxic pressures. It shows the nitric oxide effect reverses with exposure time, which a single time point would miss.
    nutrient_topic
    Hyperbaric oxygen research collection; topical membership is not evidence of a direct clinical effect, and a therapeutic exposure is not a dietary intake. · Hyperbaric oxygen therapy
    organism
    Rat
    plain_language
    The vessel response flips during a long exposure, and the flip comes just before the seizure activity.
    primary_references
    [hbot-p10749833] Nitric oxide and cerebral blood flow responses to hyperbaric oxygen. (2000). https://pubmed.ncbi.nlm.nih.gov/10749833/ DOI: 10.1152/jappl.2000.88.4.1381
    tissue_or_cell_type
    Brain

    Hyperbaric oxygen: the exposure, its reactive species, the signals they carry, and the nutrient-dependent enzymes that handle them (2026-09-19) · lines 192–203

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Regional cerebral blood flow and electroencephalography in anaesthetised rats · source_derived_draft · unverified_draft

    ### hbot-cbf-time-course Blood flow fell by 26 to 43% at 3 and 4 ATA, but at 5 ATA it fell over 30 minutes then gradually returned to pre-exposure levels, preceding the onset of electroencephalographic spiking. Condition category: normal nutrient_topic: Hyperbaric oxygen research collection; topical membership is not evidence of a direct clinical effect, and a therapeutic exposure is not a dietary intake. plain_language: The vessel response flips during a long exposure, and the flip comes just before the seizure activity. organism: Rat tissue_or_cell_type: Brain experimental_model: Regional cerebral blood flow and electroencephalography in anaesthetised rats limitations: A time-course study at toxic pressures. It shows the nitric oxide effect reverses with exposure time, which a single time point would miss. exposure: Oxygen at 1, 3, 4 and 5 ATA with L-NAME, L-arginine, nitric oxide donors or MK-801 evidence_span: {"source_cache": "artifacts/hbot-research/10749833.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "1470d09e77b6d6f6af3131a6f7db2cca647dde3655662a1c83f9d5d375f1c687", "start_char": 0, "end_char": 1283, "text_sha256": "1470d09e77b6d6f6af3131a6f7db2cca647dde3655662a1c83f9d5d375f1c687"} [hbot-p10749833] Nitric oxide and cerebral blood flow responses to hyperbaric oxygen. (2000). https://pubmed.ncbi.nlm.nih.gov/10749833/ DOI: 10.1152/jappl.2000.88.4.1381
    Complete structured claim and evidence

  3. A relative lack of nitric oxide activity contributed to the early decrease in blood flow, but as exposure was prolonged nitric oxide production increased and augmented blood flow in anticipation of neuronal excitation.

    NO → Regional cerebral blood flow source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/hbot-research/10749833.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "1470d09e77b6d6f6af3131a6f7db2cca647dde3655662a1c83f9d5d375f1c687", "start_char": 0, "end_char": 1283, "text_sha256": "1470d09e77b6d6f6af3131a6f7db2cca647dde3655662a1c83f9d5d375f1c687"}
    experimental_model
    Regional cerebral blood flow and electroencephalography in anaesthetised rats
    exposure
    Oxygen at 1, 3, 4 and 5 ATA with L-NAME, L-arginine, nitric oxide donors or MK-801
    limitations
    A time-course study at toxic pressures. It shows the nitric oxide effect reverses with exposure time, which a single time point would miss.
    nutrient_topic
    Hyperbaric oxygen research collection; topical membership is not evidence of a direct clinical effect, and a therapeutic exposure is not a dietary intake. · Hyperbaric oxygen therapy
    organism
    Rat
    plain_language
    Early on there is too little of this molecule, later too much.
    primary_references
    [hbot-p10749833] Nitric oxide and cerebral blood flow responses to hyperbaric oxygen. (2000). https://pubmed.ncbi.nlm.nih.gov/10749833/ DOI: 10.1152/jappl.2000.88.4.1381
    tissue_or_cell_type
    Brain

    Hyperbaric oxygen: the exposure, its reactive species, the signals they carry, and the nutrient-dependent enzymes that handle them (2026-09-19) · lines 205–216

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Regional cerebral blood flow and electroencephalography in anaesthetised rats · source_derived_draft · unverified_draft

    ### hbot-no-production-rises-late A relative lack of nitric oxide activity contributed to the early decrease in blood flow, but as exposure was prolonged nitric oxide production increased and augmented blood flow in anticipation of neuronal excitation. Condition category: normal nutrient_topic: Hyperbaric oxygen research collection; topical membership is not evidence of a direct clinical effect, and a therapeutic exposure is not a dietary intake. plain_language: Early on there is too little of this molecule, later too much. organism: Rat tissue_or_cell_type: Brain experimental_model: Regional cerebral blood flow and electroencephalography in anaesthetised rats limitations: A time-course study at toxic pressures. It shows the nitric oxide effect reverses with exposure time, which a single time point would miss. exposure: Oxygen at 1, 3, 4 and 5 ATA with L-NAME, L-arginine, nitric oxide donors or MK-801 evidence_span: {"source_cache": "artifacts/hbot-research/10749833.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "1470d09e77b6d6f6af3131a6f7db2cca647dde3655662a1c83f9d5d375f1c687", "start_char": 0, "end_char": 1283, "text_sha256": "1470d09e77b6d6f6af3131a6f7db2cca647dde3655662a1c83f9d5d375f1c687"} [hbot-p10749833] Nitric oxide and cerebral blood flow responses to hyperbaric oxygen. (2000). https://pubmed.ncbi.nlm.nih.gov/10749833/ DOI: 10.1152/jappl.2000.88.4.1381
    Complete structured claim and evidence

  4. Administration of superoxide dismutase into the circulation before exposure completely abolished the decrease in regional cerebral blood flow at 5 ATA.

    Human copper-zinc superoxide dismutase / SOD1 → Regional cerebral blood flow source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    machinery_impairment Imported condition classification; unverified.
    evidence_span
    {"source_cache": "artifacts/hbot-research/11139368.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "9823a7f177483257b812d7c8c8e8052c3f04d6a7aa052876369c7c64b55668f3", "start_char": 0, "end_char": 1672, "text_sha256": "9823a7f177483257b812d7c8c8e8052c3f04d6a7aa052876369c7c64b55668f3"}
    experimental_model
    Regional cerebral blood flow measurement in rats with nitric oxide metabolite and hydroxyl radical assays
    exposure
    Oxygen at 5 atmospheres absolute for 30 minutes, with L-NAME, a nitric oxide donor, or intravascular superoxide dismutase
    limitations
    Five atmospheres is well above therapeutic pressure and was chosen to study oxygen toxicity. The superoxide dismutase rescue is the key mechanistic step.
    nutrient_topic
    Hyperbaric oxygen research collection; topical membership is not evidence of a direct clinical effect, and a therapeutic exposure is not a dietary intake. · Hyperbaric oxygen therapy
    organism
    Rat
    plain_language
    Giving the enzyme that clears superoxide kept the vessels open.
    primary_references
    [hbot-p11139368] Hyperbaric oxygen reduces cerebral blood flow by inactivating nitric oxide. (2000). https://pubmed.ncbi.nlm.nih.gov/11139368/ DOI: 10.1006/niox.2000.0313
    tissue_or_cell_type
    Brain
    trigger_kind
    machinery_impairment Imported condition classification; unverified.

    Hyperbaric oxygen: the exposure, its reactive species, the signals they carry, and the nutrient-dependent enzymes that handle them (2026-09-19) · lines 179–190

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Regional cerebral blood flow measurement in rats with nitric oxide metabolite and hydroxyl radical assays · source_derived_draft · unverified_draft

    ### hbot-sod-rescue Administration of superoxide dismutase into the circulation before exposure completely abolished the decrease in regional cerebral blood flow at 5 ATA. Condition category: machinery_impairment nutrient_topic: Hyperbaric oxygen research collection; topical membership is not evidence of a direct clinical effect, and a therapeutic exposure is not a dietary intake. plain_language: Giving the enzyme that clears superoxide kept the vessels open. organism: Rat tissue_or_cell_type: Brain experimental_model: Regional cerebral blood flow measurement in rats with nitric oxide metabolite and hydroxyl radical assays limitations: Five atmospheres is well above therapeutic pressure and was chosen to study oxygen toxicity. The superoxide dismutase rescue is the key mechanistic step. exposure: Oxygen at 5 atmospheres absolute for 30 minutes, with L-NAME, a nitric oxide donor, or intravascular superoxide dismutase evidence_span: {"source_cache": "artifacts/hbot-research/11139368.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "9823a7f177483257b812d7c8c8e8052c3f04d6a7aa052876369c7c64b55668f3", "start_char": 0, "end_char": 1672, "text_sha256": "9823a7f177483257b812d7c8c8e8052c3f04d6a7aa052876369c7c64b55668f3"} [hbot-p11139368] Hyperbaric oxygen reduces cerebral blood flow by inactivating nitric oxide. (2000). https://pubmed.ncbi.nlm.nih.gov/11139368/ DOI: 10.1006/niox.2000.0313
    Complete structured claim and evidence

In the sources

Preserved passages that mention this component, quoted exactly. Open one to read it in context.

    This is a research prototype built from draft material. It is not medical advice, and its statements still await verification against the original studies.

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