2nd Edition of

International Ophthalmology Conference

October 19-21, 2023 | Online Event

IOC 2023

Cheuk Lam Ho

Speaker at International Ophthalmology Conference 2023 - Cheuk Lam Ho
NHS Lanarkshire, United Kingdom
Title : Blood pressure changes in patients undergoing 23G vitrectomy under local anaesthesia


The effect of elevated blood pressure (BP) during ophthalmic surgery, is associated with significant visually threatening complications. Elevated blood pressure prior to surgery can result in cancellation and postponement of surgeries and further add to the strain of limited staff and resources. Vitreoretinal surgery is technically complex and time consuming compared to cataract surgery and is often carried out under local anaesthesia. Blood pressure changes in patients undergoing vitreoretinal surgery under local anaesthesia is still poorly studied. This study aims to investigate blood pressure changes during a patient’s admission for 23G vitrectomy under local anaesthesia.

Observational prospective study. 117 consecutive patients are included. Blood pressure measurements were taken on the day of admission at various points; on arrival at the day surgery unit, preoperative, intraoperative and 30 minutes postoperative stages. Demographic and co-morbidities of patients were collected from patient electronic record. Changes in blood pressure is correlated to various patient factors such as hypertension, diabetes, previous cardiovascular and cerebrovascular events, chronic kidney disease, smokers’ status and anxiety. Correlation to surgical factors such as surgical duration and number of staff duration the operation is also investigated using statistical methods.  

2/117 patients were cancelled due to SBP exceeding 200mmHg at the preoperative stage.

18% of patients had SBP of ≥160mmHg on arrival.  27% experienced ≥ 20mmHg of SBP increase at preoperative, where 34% and 20% had SBP of ≥ 160mmHg and ≥180mmHg respectively. Intraoperatively, 28% and 13% experienced SBP of ≥160mmHg and ≥180mmHg respectively. Postoperatively, 24% and 5% sustained SBP of ≥ 160mmHg and ≥180mmHg respectively. The changes in BP are not correlated with patient comorbidities. However, it did demonstrate change according to the surgical stages; mean value of +11mmHg from arrival to preoperative, -5mmHg from preoperative to intraoperative and a further -5mmHg from intraoperative to postoperative.

Our study demonstrates a pattern for patient’s blood pressure during their admission for vitrectomy.  While it is reassuring to note that most patients experience the expected change of blood pressure within the safe levels, those with very high recorded BP at various points are not only exposed to the risk of developing systemic events, but also serious surgical complications such as heavy intraoperative bleeding and choroidal haemorrhage. 

Audience Take Away Notes:

  • Explain how the audience will be able to use what they learn?
  • How will this help the audience in their job?
  • Is this research that other faculty could use to expand their research or teaching?
  • Does this provide a practical solution to a problem that could simplify or make a designer’s job more efficient?
  • Will it improve the accuracy of a design, or provide new information to assist in a design problem?
  • List all other benefits.


Cheuk Lam (Vivian) Ho studied University of Glasgow and graduated as MBChB in 2023 after obtaining a BSc Medicinal Chemistry (Hons) degree in University of Edinburgh in 2018. She developed interest in ophthalmology in medical school and took an active role in quality improvement project supervised by Dr Michael in University Hospital Ayr. Vivian also went to Hong Kong Eye Hospital for shadowing experience supervised by Dr Chan and gained an appreciation in the difference of practice in ophthalmology between United Kingdom and Hong Kong. Vivian is currently a foundation year doctor in University Hospital Wishaw and is looking to pursue a career in ophthalmology.