Phân tích Meta mới trên tạp chí Frontier s in Public Health cho biết việc đeo khẩu trang thường xuyên có thể gây ra hội chứng kiệt sức do đeo khẩu trang (MIES), hội chứng này có thể có các triệu chứng chồng chéo của hội chứng Cov đường dài.
Thêm bằng chứng về những gì chúng ta đã biết từ lẽ thường rằng đeo khẩu trang là không an toàn và tiềm ẩn nhiều biến chứng sức khỏe liên quan.
Bài báo kết luận: Trong trường hợp không có bằng chứng thực nghiệm mạnh mẽ về hiệu quả, việc đeo khẩu trang không nên bị bắt buộc chứ chưa nói đến việc thực thi theo luật.
https://www.frontiersin.org/articles/10.3389/fpubh.2023.1125150/full?fbclid=IwAR3ZSf1hHaP6KUjnuytUdI0K849XLbcEQrXKe9fDZPT7qukj0WcpUIyDKLo
Results: We found significant effects in both medical surgical and N95 masks, with a greater impact of the second. These effects included decreased SpO2 (overall Standard Mean Difference, SMD = −0.24, 95% CI = −0.38 to −0.11, p < 0.001) and minute ventilation (SMD = −0.72, 95% CI = −0.99 to −0.46, p < 0.001), simultaneous increased in blood-CO2 (SMD = +0.64, 95% CI = 0.31–0.96, p < 0.001), heart rate (N95: SMD = +0.22, 95% CI = 0.03–0.41, p = 0.02), systolic blood pressure (surgical: SMD = +0.21, 95% CI = 0.03–0.39, p = 0.02), skin temperature (overall SMD = +0.80 95% CI = 0.23–1.38, p = 0.006) and humidity (SMD +2.24, 95% CI = 1.32–3.17, p < 0.001). Effects on exertion (overall SMD = +0.9, surgical = +0.63, N95 = +1.19), discomfort (SMD = +1.16), dyspnoea (SMD = +1.46), heat (SMD = +0.70), and humidity (SMD = +0.9) were significant in n = 373 with a robust relationship to mask wearing (p < 0.006 to p < 0.001). Pooled symptom prevalence (n = 8,128) was significant for: headache (62%, p < 0.001), acne (38%, p < 0.001), skin irritation (36%, p < 0.001), dyspnoea (33%, p < 0.001), heat (26%, p < 0.001), itching (26%, p < 0.001), voice disorder (23%, p < 0.03), and dizziness (5%, p = 0.01).
Discussion: Masks interfered with O2-uptake and CO2-release and compromised respiratory compensation. Though evaluated wearing durations are shorter than daily/prolonged use, outcomes independently validate mask-induced exhaustion-syndrome (MIES) and down-stream physio-metabolic disfunctions. MIES can have long-term clinical consequences, especially for vulnerable groups. So far, several mask related symptoms may have been misinterpreted as long COVID-19 symptoms. In any case, the possible MIES contrasts with the WHO definition of health.
Conclusion: Face mask side-effects must be assessed (risk-benefit) against the available evidence of their effectiveness against viral transmissions. In the absence of strong empirical evidence of effectiveness, mask wearing should not be mandated let alone enforced by law.
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