The cardiovascular state after resuscitation from cardiac arrest: molecular mechanisms & dependencies

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At high levels of dihydrocapsaicin infusion above 2.0 mg/kg/h two single episodes of transient bradycardia and hypotension were observed in 33% of healthy rats, consistent with a TRPV1-agonist-induced Bezold-Jarisch reflex, whereas in resuscitated rats multiple episodes were observed in 100% of the rats at a dose of 0.65 mg/kg/h, and this effect could be completely blocked in the resuscitated rats by pre-treatment with the muscarinic acetylcholine antagonist atropine.
Dihydrocapsaicin → The Bezold-Jarisch reflex of bradycardia and hypotension source_derived_draftungraded
Experimental context and source evidence
availability_state
biomarker_context Imported condition classification; unverified.
evidence_span
{"source_cache": "artifacts/dihydrocapsaicin-research/20807439.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "49bfe9de2b31cccc9afa70d322f9c96256968e48fdc033102fdb46394e617b0c", "start_char": 0, "end_char": 1709, "text_sha256": "49bfe9de2b31cccc9afa70d322f9c96256968e48fdc033102fdb46394e617b0c"}
experimental_model
Continuous intravenous infusion in healthy rats and in rats resuscitated from cardiac arrest, with atropine pre-treatment
exposure
Dihydrocapsaicin by continuous intravenous infusion at doses up to and beyond 2.0 mg/kg/h
limitations
The most important safety record in this collection, and the one whose population is the same population the therapy is aimed at. It is a rat study and the episodes are described rather than counted per animal.
nutrient_topic
Dihydrocapsaicin research collection; topical membership is not evidence of a direct clinical effect, and dihydrocapsaicin is recorded separately from capsaicin. · Dihydrocapsaicin
organism
Rat
plain_language
After a cardiac arrest the same drug triggers dangerous slowing of the heart at a third of the dose, and atropine stops it.
primary_references
[dhc-p20807439] Increased susceptibility to cardiovascular effects of dihydrocapcaicin in resuscitated rats. Cardiovascular effects of dihydrocapsaicin. (2010). https://pubmed.ncbi.nlm.nih.gov/20807439/ DOI: 10.1186/1471-2261-10-39
tissue_or_cell_type
Cardiovascular system
trigger_kind
biomarker_context Imported condition classification; unverified.
Dihydrocapsaicin: the second capsaicinoid, the hypothermia it is used to induce, what the gut and liver do to it, and what it does without TRPV1 (2026-09-21) · lines 374–385
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Continuous intravenous infusion in healthy rats and in rats resuscitated from cardiac arrest, with atropine pre-treatment · source_derived_draft · unverified_draft
### dhc-bezold-jarisch-susceptibility At high levels of dihydrocapsaicin infusion above 2.0 mg/kg/h two single episodes of transient bradycardia and hypotension were observed in 33% of healthy rats, consistent with a TRPV1-agonist-induced Bezold-Jarisch reflex, whereas in resuscitated rats multiple episodes were observed in 100% of the rats at a dose of 0.65 mg/kg/h, and this effect could be completely blocked in the resuscitated rats by pre-treatment with the muscarinic acetylcholine antagonist atropine. Condition category: biomarker_context nutrient_topic: Dihydrocapsaicin research collection; topical membership is not evidence of a direct clinical effect, and dihydrocapsaicin is recorded separately from capsaicin. plain_language: After a cardiac arrest the same drug triggers dangerous slowing of the heart at a third of the dose, and atropine stops it. organism: Rat tissue_or_cell_type: Cardiovascular system experimental_model: Continuous intravenous infusion in healthy rats and in rats resuscitated from cardiac arrest, with atropine pre-treatment limitations: The most important safety record in this collection, and the one whose population is the same population the therapy is aimed at. It is a rat study and the episodes are described rather than counted per animal. exposure: Dihydrocapsaicin by continuous intravenous infusion at doses up to and beyond 2.0 mg/kg/h evidence_span: {"source_cache": "artifacts/dihydrocapsaicin-research/20807439.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "49bfe9de2b31cccc9afa70d322f9c96256968e48fdc033102fdb46394e617b0c", "start_char": 0, "end_char": 1709, "text_sha256": "49bfe9de2b31cccc9afa70d322f9c96256968e48fdc033102fdb46394e617b0c"} [dhc-p20807439] Increased susceptibility to cardiovascular effects of dihydrocapcaicin in resuscitated rats. Cardiovascular effects of dihydrocapsaicin. (2010). https://pubmed.ncbi.nlm.nih.gov/20807439/ DOI: 10.1186/1471-2261-10-39
Complete structured claim and evidence
Compared to baseline, infusion of dihydrocapsaicin caused an initial increase in mean arterial blood pressure of 25% in healthy rats and 10% in resuscitated rats, and an initial tachycardic response of 30% and 20% respectively.
Dihydrocapsaicin → Mean arterial pressure source_derived_draftungraded
Experimental context and source evidence
evidence_span
{"source_cache": "artifacts/dihydrocapsaicin-research/20807439.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "49bfe9de2b31cccc9afa70d322f9c96256968e48fdc033102fdb46394e617b0c", "start_char": 0, "end_char": 1709, "text_sha256": "49bfe9de2b31cccc9afa70d322f9c96256968e48fdc033102fdb46394e617b0c"}
experimental_model
Continuous intravenous infusion in healthy rats and in rats resuscitated from cardiac arrest, with atropine pre-treatment
exposure
Dihydrocapsaicin by continuous intravenous infusion at doses up to and beyond 2.0 mg/kg/h
limitations
The most important safety record in this collection, and the one whose population is the same population the therapy is aimed at. It is a rat study and the episodes are described rather than counted per animal.
nutrient_topic
Dihydrocapsaicin research collection; topical membership is not evidence of a direct clinical effect, and dihydrocapsaicin is recorded separately from capsaicin. · Dihydrocapsaicin
organism
Rat
plain_language
The first thing it does is push blood pressure and heart rate up, before anything else happens.
primary_references
[dhc-p20807439] Increased susceptibility to cardiovascular effects of dihydrocapcaicin in resuscitated rats. Cardiovascular effects of dihydrocapsaicin. (2010). https://pubmed.ncbi.nlm.nih.gov/20807439/ DOI: 10.1186/1471-2261-10-39
tissue_or_cell_type
Cardiovascular system
Dihydrocapsaicin: the second capsaicinoid, the hypothermia it is used to induce, what the gut and liver do to it, and what it does without TRPV1 (2026-09-21) · lines 387–398
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Continuous intravenous infusion in healthy rats and in rats resuscitated from cardiac arrest, with atropine pre-treatment · source_derived_draft · unverified_draft
### dhc-initial-pressor-response Compared to baseline, infusion of dihydrocapsaicin caused an initial increase in mean arterial blood pressure of 25% in healthy rats and 10% in resuscitated rats, and an initial tachycardic response of 30% and 20% respectively. Condition category: normal nutrient_topic: Dihydrocapsaicin research collection; topical membership is not evidence of a direct clinical effect, and dihydrocapsaicin is recorded separately from capsaicin. plain_language: The first thing it does is push blood pressure and heart rate up, before anything else happens. organism: Rat tissue_or_cell_type: Cardiovascular system experimental_model: Continuous intravenous infusion in healthy rats and in rats resuscitated from cardiac arrest, with atropine pre-treatment limitations: The most important safety record in this collection, and the one whose population is the same population the therapy is aimed at. It is a rat study and the episodes are described rather than counted per animal. exposure: Dihydrocapsaicin by continuous intravenous infusion at doses up to and beyond 2.0 mg/kg/h evidence_span: {"source_cache": "artifacts/dihydrocapsaicin-research/20807439.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "49bfe9de2b31cccc9afa70d322f9c96256968e48fdc033102fdb46394e617b0c", "start_char": 0, "end_char": 1709, "text_sha256": "49bfe9de2b31cccc9afa70d322f9c96256968e48fdc033102fdb46394e617b0c"} [dhc-p20807439] Increased susceptibility to cardiovascular effects of dihydrocapcaicin in resuscitated rats. Cardiovascular effects of dihydrocapsaicin. (2010). https://pubmed.ncbi.nlm.nih.gov/20807439/ DOI: 10.1186/1471-2261-10-39
Complete structured claim and evidence

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The cardiovascular state after resuscitation from cardiac arrest