Chris D Hanning

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BACKGROUND Long-term postoperative cognitive dysfunction may occur in the elderly. Age may be a risk factor and hypoxaemia and arterial hypotension causative factors. We investigated these hypotheses in an international multicentre study. METHODS 1218 patients aged at least 60 years completed neuropsychological tests before and 1 week and 3 months after(More)
Postoperative cognitive function (POCD) has been subject to extensive research. In the literature, large differences are apparent in methodology such as the test batteries, the interval between sessions, the endpoints to be analysed, statistical methods, and how neuropsychological deficits are defined. Traditionally, intelligence tests or tests developed(More)
BACKGROUND Major surgery is frequently associated with postoperative cognitive dysfunction (POCD) in elderly patients. Type of surgery and hospitalization may be important prognostic factors. The aims of the study were to find the incidence and risk factors for POCD in elderly patients undergoing minor surgery. METHODS We enrolled 372 patients aged(More)
BACKGROUND Postoperative cognitive dysfunction (POCD) is a well-recognised complication of cardiac surgery, but evidence of POCD after general surgery has been lacking. We recently showed that POCD was present in 9.9% of elderly patients 3 months after major non-cardiac surgery. The aim of the present study was to investigate whether POCD persists for 1-2(More)
BACKGROUND Postoperative cognitive dysfunction (POCD) after noncardiac surgery is strongly associated with increasing age in elderly patients; middle-aged patients (aged 40-60 yr) may be expected to have a lower incidence, although subjective complaints are frequent. METHODS The authors compared the changes in neuropsychological test results at 1 week and(More)
BACKGROUND Postoperative cognitive dysfunction (POCD) is a common complication after cardiac and major non-cardiac surgery with general anaesthesia in the elderly. We hypothesized that the incidence of POCD would be less with regional anaesthesia rather than general. METHODS We included patients aged over 60 years undergoing major non-cardiac surgery.(More)
BACKGROUND The pattern of cortisol secretion is influenced by surgery. As cortisol can adversely affect neuronal function, this may be an important factor in the development of post-operative cognitive dysfunction (POCD). We hypothesized that the incidence of POCD would be related to changes in cortisol level. METHODS We studied 187 patients aged over 60(More)
Postoperative cognitive dysfunction is a severe and life-threatening complication after an operation. The mobilisation of the patient is difficult and, therefore, the stay of the patient in the hospital is extended and the resulting immobilisation is associated with further complications (e.g. decubitus, pneumonia, or thrombosis). The genesis of the(More)
Peri-operative blood loss was compared in a prospective, randomized double-blind study between two groups of patients undergoing transurethral prostatectomy (TURP) under spinal (subarachnoid) analgesia: the first received the non-steroidal anti-inflammatory drug diclofenac sodium, the second group received placebo. The total blood loss and the blood loss(More)
The effects of cold-induced vasoconstriction and venous occlusion on the detection of induced hypoxaemia by four pulse oximeters were examined in 10 volunteers. In three further subjects vasoconstriction was maintained until at least one instrument failed to detect the induced hypoxaemia. Time taken to detect hypoxaemia was increased for all instruments to(More)