A blood pressure reading that is consistently lower than 90/60 mmHg is termed as low blood pressure or hypotension, while a reading over 140/90 mmHg is termed as high blood pressure or hypertension. A new study by Puja Myles and Sudhir Venkatesan from the University of Nottingham in Britain and colleagues has revealed that patients with low blood pressure before an operation are at an increased risk of death during or after the surgery than those with preoperative high blood pressure.
The study said, "While high blood pressure control is important for long-term health, high blood pressure itself does not impose a significant risk of postoperative death."
Researchers used data from 252,278 patients from the United Kingdom Clinical Practice Research Datalink to perform their analysis. A number of models of varying complexities were used to account for 29 perioperative risk factors including age, gender, race, co-morbidities, medications and surgical risk score. Perioperative refers to the three phases of surgery- preoperative, intraoperative and postoperative.
The researchers said, "Preoperative low blood pressure is under-recognized as a risk factor for perioperative mortality. Future studies will need to identify how this risk can be modified to improve patient outcomes."
This study was presented at Euroanaesthesia 2015, the European Anesthesiology Congress, in Berlin, Germany.