What low blood pressure means Hypotension is the medical term for low blood pressure, which is typically defined by a blood pressure reading of 90/60 mm Hg or lower For reference, a normal blood pressure range is around 100/60 mm Hg to 1/80 mm Hg Systolic BP Diastolic BP Hypotension 50 mmHg 3059 mmHg Normal mmHg 6079 mmHg High Normal 1139 mmHg 80 mmHg Mild high BP mmHg 9099 mmHg Moderate high BP 160 mmHg or higher 100 mmHg or higher Severe hypertension 180 mmHg or higher 110 mmHg or higher The 80/70/60 rule taught by the prehospital medicine and older editions of ATLS courses tend to overestimate the patient's blood pressure This has been shown by two different studies 1 Deakin CD, Low JL Accuracy of the advanced trauma life support guidelines for predicting systolic blood pressure using carotid, femoral, and radial pulses
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