disease factors in making the blood veins1. physical factors of patientsoverweightinjured former2. psychological factors of patientsfor example, excess fear phase3. the factor-error technique, direction angle not right JAB JAB is too small or big, one of the decisive vein, puncture too deep or less, due to the inflexible shifted vesselsnon technical mistakes, collapsing, blood volume is reduced due to bleeding means deprivation of bodily fluids blood pressure down
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