Criteria for Recruitment and Recruitment Process Patients will be shortlisted from the surgical list the week prior to surgery. Patients seen in the pre anaesthetic assessment clinic will also be invited to take part in the study. A simple history and physical assessment will determine eligibility. Patients fitting the inclusion criteria will be approached for the study with the emphasis that participation is voluntary and refusal to participate will not affect subsequent conduct of anaesthesia or care. Patient's wishes will be respected should she request not to participate