Long flights roughly double clot risk from a small baseline, and the risk peaks two weeks after landing. Compression stockings have high-certainty Cochrane evidence behind them, with one caveat worth reading.
A randomised trial found that using a regular adult cuff on someone who needs an extra-large one overestimates systolic pressure by about 20 mmHg – enough to turn 125/79 into 144/87 on the same arm. What the WHO numbers say about the 600 million who do not know, what SPRINT actually showed, and how to get a reading worth acting on.
A million-person meta-analysis found that sitting eight hours a day raised mortality by 59% in inactive people and by almost nothing in active ones. Then 83,013 accelerometer-tracked adults showed standing more gave no cardiovascular benefit at all.
