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• W4281738247 abstract "New Findings What is the central question of this study? Acute exposure to electronic cigarettes (Ecigs) triggers abnormal vascular responses in systemic arteries; however, effects on cerebral vessels are poorly understood and time for recovery is not known. We hypothesized that exposure to cigarettes or Ecigs would trigger rapid (<4 h) impairment of the middle cerebral artery (MCA) but that this would resolve by 24 h. What is the main finding and its importance? Cigarettes and Ecigs caused similar degree and duration of MCA impairment. We find it takes ~72 hours after exposure for MCA function to return to normal. This suggests that Ecig use is likely to produce similar adverse vascular health outcomes to those seen with cigarette smoke. Abstract Temporal influences of electronic cigarettes (Ecigs) on blood vessels are poorly understood. In this study, we evaluated a single episode of cigarette versus Ecig exposure on middle cerebral artery (MCA) reactivity and determined how long after the exposure MCA responses took to return to normal. We hypothesized that cigarette and Ecig exposure would induce rapid (<4 h) reduction in MCA endothelial function and would resolve within 24 h. Sprague–Dawley rats (4 months old) were exposed to either air ( n = 5), traditional cigarettes (20 puffs, n = 16) or Ecigs (20‐puff group, n = 16; or 60‐puff group, n = 12). Thereafter, the cigarette and Ecig groups were randomly assigned for postexposure vessel myography testing on day 0 (D0, 1–4 h postexposure), day 1 (D1, 24–28 h postexposure), day 2 (D2, 48–52 h postexposure) and day 3 (72–76 h postexposure). The greatest effect on endothelium‐dependent dilatation was observed within 24 h of exposure (∼50% decline between D0 and D1) for both cigarette and Ecig groups, and impairment persisted with all groups for up to 3 days. Changes in endothelium‐independent dilatation responses were less severe (∼27%) and shorter lived (recovering by D2) compared with endothelium‐dependent dilatation responses. Vasoconstriction in response to serotonin (5‐HT) was similar to endothelium‐independent dilatation, with greatest impairment (∼45% for all exposure groups) at D0–D1, returning to normal by D2. These data show that exposure to cigarettes and Ecigs triggers a similar level/duration of cerebrovascular dysfunction after a single exposure. The finding that Ecig (without nicotine) and cigarette (with nicotine) exposure produce the same effects suggesting that nicotine is not likely to be triggering MCA dysfunction, and that vaping (with/without nicotine) has potential to produce the same vascular harm and/or disease as smoking." @default.
• W4281738247 created "2022-06-13" @default.
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• W4281738247 date "2022-06-17" @default.
• W4281738247 modified "2023-10-16" @default.
• W4281738247 title "Short‐term effects of electronic cigarettes on cerebrovascular function: A time course study" @default.
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• W4281738247 doi "https://doi.org/10.1113/ep090341" @default.
• W4281738247 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35661445" @default.
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