Background The changes of blood pressure in patients undergoing cataract procedure are not well studied. The blood pressures of cataract patients often become uncontrolled intraoperatively causing the procedure to be postponed. Intraoperative rise in blood pressure has been associated with ocular complications such as suprachoroidal haemorrhage and can be fatal from stroke or even myocardial infarction. We attempt to study the changes in blood pressure of patients undergoing cataract surgery. Aim Prospective study on the variation of blood pressure pre-and intra-operatively. Method The blood pressure readings of patients going for cataract procedures were measured in five stages during the pre-assessment clinic, on arrival at the day surgery, at the anaesthetic room, on the operating table intraoperatively; and postoperatively. The readings were compared to their age, sex, past medical history, and use of antihypertensive medication. Results The rise in systolic blood pressures between intraoperative readings and those at the preassessment and anaesthetic room was highly statistically significant. Being older (465 years of age), taking more than two antihypertensive drugs, being hypertensive, or having a family history of hypertension does not appear to increase the risk. Conclusion Our study showed that there is a significant rise in systolic blood pressures especially in females during topical phacoemulsification. Further studies are needed on the factors that determine this increase and the changes in blood pressures during different stages of the procedure.

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providing the high speed and pressure drop that are necessary for the Coanda effect to occur. 2 The distance from the nozzle to the bifurcation was also above the threshold required for the subsequent unidirectional branch flow (i.e. ,2 nozzle widths). 3 If the Coanda effect were established in the right side of the trachea, flow to the left lung would only take place after pressure in the right lung equilibrates with the ventilating pressure (i.e. no more pressure gradient), thus explaining the delayed ventilation of the left lung that was observed clinically.When suitable geometry of the tracheal tube tip and trachea occur, as seen in this case, the bifurcating structure of the trachea theoretically provides a suitable medium for the occurrence of the Coanda effect. However, the Coanda effect has not been described before in human airways beyond the glottis, but considering what a clinically significant problem may result from its occurrence further investigation of the phenomenon using a physical or mathematical model is warranted.

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