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Mamontov OV, Sokolov AY, Volynsky MA, Osipchuk AV, Zaytsev VV, Romashko RV, Kamshilin AA. Animal model of assessing cerebrovascular functional reserve by imaging photoplethysmography. Sci Rep 2020; 10:19008. [PMID: 33149189 PMCID: PMC7642404 DOI: 10.1038/s41598-020-75824-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Accepted: 10/16/2020] [Indexed: 01/12/2023] Open
Abstract
Assessment of the cerebral blood-flow-reserve in patients with cerebrovascular diseases is extremely important in terms of making prognosis, determining treatment tactics, and controlling the revascularization outcome in the case of reconstructive interventions on the brain vessels. However, there is no easy-to-use, contactless method for either assessing the functional reserve of the cortical vascular network or intraoperative monitoring of surgical intervention. Our study aims to demonstrate feasibility of green-light imaging photoplethysmography (iPPG) to estimate cerebrovascular functional reserve in animal model of craniosurgical intervention. Custom-made iPPG system was exploited to visualize intracranial vessels in anesthetized Wistar rats (n = 15). Video frames of rat's cortex were recorded concurrently with systemic blood pressure, end-tidal CO2, and electrocardiogram. We found that injection of dorzolamide (carbonic-anhydrase inhibitor) significantly increased the blood-pulsations amplitude in all animals by 35 ± 19% (p < 0.001). Such an increase negatively correlated with significant decrease in end-tidal CO2 by 32 ± 7% (p < 0.001). It is noteworthy that the dorzolamide injection did not lead to significant changes in systemic blood pressure. Concluding, pulsations amplitude is a marker of the vascular tone that can be used to evaluate the functional cerebrovascular reserve. Imaging PPG is a simple and convenient method to assess cerebral blood flow, including during various neurosurgical interventions.
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Affiliation(s)
- Oleg V Mamontov
- Department of Circulation Physiology, Almazov National Medical Research Centre, Saint Petersburg, Russia.,Department of Departmental Therapy, Pavlov First Saint Petersburg State Medical University, Saint Petersburg, Russia
| | - Alexey Y Sokolov
- Department of Neuropharmacology, Valdman Institute of Pharmacology, Pavlov First Saint Petersburg State Medical University, Saint Petersburg, Russia.,Pavlov Institute of Physiology of the Russian Academy of Sciences, Saint Petersburg, Russia
| | - Maxim A Volynsky
- Faculty of Applied Optics, ITMO University, Saint Petersburg, Russia
| | - Anastasija V Osipchuk
- Department of Neuropharmacology, Valdman Institute of Pharmacology, Pavlov First Saint Petersburg State Medical University, Saint Petersburg, Russia
| | - Valery V Zaytsev
- Faculty of Applied Optics, ITMO University, Saint Petersburg, Russia
| | - Roman V Romashko
- Laboratory of High-Precision Optical Measurements, Institute of Automation and Control Processes FEB RAS, Vladivostok, Russia
| | - Alexei A Kamshilin
- Laboratory of High-Precision Optical Measurements, Institute of Automation and Control Processes FEB RAS, Vladivostok, Russia. .,Faculty of Photonics and Optical Information, ITMO University, Saint Petersburg, Russia.
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