01-024 · EVIDENCE A · SOURCE-SENSITIVE
Heavy smokers should get a low-dose chest CT once a year
重度吸烟者每年做一次低剂量胸部 CT
The test costs 200–400 yuan per session and takes just 10 minutes. You must also factor in follow-up tests after any false alarms, plus the anxiety that comes with waiting for results.
Eligible heavy smokers who get a low-dose CT once a year have a 20% lower risk of dying from lung cancer and a 6.7% lower overall risk of death compared to those who only get regular chest X-rays. The trade-offs are extra follow-up tests after any suspicious findings and the resulting worry during the waiting period.
A
Move “Heavy smokers should get a low-dose chest CT once a year” to Future Me's calendar
The excuse
I can spend longer deciding whether to start than the small action would take.
What feels good now
Today I keep a little money, a few minutes and avoid interrupting my default routine.
What the source says
The source summarizes the return this way: “Eligible heavy smokers who get a low-dose CT once a year have a 20% lower risk of dying from lung cancer and a 6.7% lower overall risk of death compared to those who only get regular chest X-rays. The trade-offs are extra follow-up tests after any suspicious findings and the resulting worry during the waiting period.” Evidence grade A. The original states the population, caveats, and sources; this is not a personal forecast.
Use the original facts and limits. For an urgent medical, safety, financial, or legal issue, contact a qualified local professional or service.
THE ENGLISH EDITION
Original recommendation and evidence
24. Heavy smokers should get a low-dose chest CT once a year
Cost: The test costs 200–400 yuan per session and takes just 10 minutes. You must also factor in follow-up tests after any false alarms, plus the anxiety that comes with waiting for results.
In plain terms: Eligible heavy smokers who get a low-dose CT once a year have a 20% lower risk of dying from lung cancer and a 6.7% lower overall risk of death compared to those who only get regular chest X-rays. The trade-offs are extra follow-up tests after any suspicious findings and the resulting worry during the waiting period.
Benefit: The NLST trial in the U.S. enrolled 53,454 participants aged 55–74 with at least 30 pack-years of smoking history and who had quit smoking no more than 15 years prior. Those who underwent low-dose CT had a 20.0% relative reduction in lung cancer deaths versus those who only got chest X-rays. The 95% confidence interval is 6.8–26.7. Overall mortality dropped by 6.7% relative to controls, with a 95% CI of 1.2–13.6.
Evidence grade: A
Sources: National Lung Screening Trial Research Team (2011). Reduced Lung-Cancer Mortality with Low-Dose Computed Tomographic Screening. New England Journal of Medicine. <https://doi.org/10.1056/NEJMoa1102873>
Notes: This recommendation applies only to high-risk smokers. In the same study, 24.2% of CT recipients showed suspicious findings, yet 96.4% of those cases turned out to be false positives. For non-smokers, undergoing this test offers no benefit and only adds unnecessary anxiety.
Read the complete Chinese source and notes
24. 重度吸烟者每年做一次低剂量胸部 CT
成本: 一次 200 到 400 元，10 分钟做完。另外要算上虚惊一场之后的复查，和那段时间的提心吊胆。
说人话: 符合条件的重度吸烟者每年做一次低剂量 CT，死于肺癌的概率比只拍胸片低 20%，总的死亡概率低 6.7%。代价是查出可疑结果后的复查，和那一段时间的提心吊胆。
收益: 美国 NLST 随机试验收了 53,454 人，都是 55 到 74 岁、吸烟史 30 包年以上、戒烟不超过 15 年的人。包年是算烟量的单位，每天一包抽一年算一包年。结果是这样。做低剂量 CT 的人比只拍胸片的人，肺癌死亡相对下降 20.0%。可信范围 95% CI 6.8 到 26.7。总死亡率相对下降 6.7%，可信范围 95% CI 1.2 到 13.6
证据等级: A
来源: National Lung Screening Trial Research Team (2011). Reduced Lung-Cancer Mortality with Low-Dose Computed Tomographic Screening. New England Journal of Medicine. <https://doi.org/10.1056/NEJMoa1102873>
备注: 这条只适用于高危吸烟者。同一项试验里，做低剂量 CT 的人有 24.2% 查出可疑结果，这些人里 96.4% 是虚惊一场（假阳性）。不吸烟的人做这项检查，等于花钱买焦虑。
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