Making decisions with families at the end of life

Because advance directives are not yet the norm, end-of-life decisions for patients without medical decision-making capacity are made regularly within discussions between the patient's physician and family. Communication and decision making in these situations require a complex integration of relevant conceptual knowledge of ethical implications, the principle of surrogate decision making, and legal considerations; and communication skills that address the highly charged emotional issues under discussion. The most common pitfalls in establishing plans of care for patients who lack decision-making capacity include failure to reach a shared appreciation of the patient's condition and prognosis; failure to apply the principle of substituted judgment; offering the choice between care and no care, rather than offering the choice between prolonging life and quality of life; too literal an interpretation of an isolated, out-of-context, patient statement made earlier in life; and failure to address the full range of end-of-life decisions from do-not-resuscitate orders to exclusive palliative care.     

Lymph node imprint cytology for the rapid assessment of axillary node metastases in breast cancer

Lymph node imprint cytology was performed on 86 nodes from 13 consecutive patients with breast cancer undergoing simple mastectomy with axillary node sampling, and a prospective comparison with paraffin section was made. The results showed a diagnostic sensitivity and specificity of 0.93 and 0.98 respectively. The predictive value of a positive result was 0.98. This technique can be used to identify patients with Stage I disease rapidly, thereby allowing their exclusion from treatment with peri-operative chemotherapy.     

Cerebral blood flow response to changes in arterial carbon dioxide tension during hypothermic cardiopulmonary bypass in children

We examined the relationship of changes in partial pressure of carbon dioxide on cerebral blood flow responsiveness in 20 pediatric patients undergoing hypothermic cardiopulmonary bypass. Cerebral blood flow was measured during steady-state hypothermic cardiopulmonary bypass with the use of xenon 133 clearance methodology at two different arterial carbon dioxide tensions. During these measurements there was no significant change in mean arterial pressure, nasopharyngeal temperature, pump flow rate, or hematocrit value. Cerebral blood flow was found to be significantly greater at higher arterial carbon dioxide tensions (p less than 0.01), so that for every millimeter of mercury rise in arterial carbon dioxide tension there was a 1.2 ml.100 gm-1.min-1 increase in cerebral blood flow. Two factors, deep hypothermia (18 degrees to 22 degrees C) and reduced age (less than 1 year), diminished the effect carbon dioxide had on cerebral blood flow responsiveness but did not eliminate it. We conclude that cerebral blood flow remains responsive to changes in arterial carbon dioxide tension during hypothermic cardiopulmonary bypass in infants and children; that is, increasing arterial carbon dioxide tension will independently increase cerebral blood flow.     

Side-to-end colorectal anastomosis with monofilament stainless steel wire.

Anastomotic separation after anterior resection of the rectum remains a major problem, although the frequency of anastomotic dehiscence after anterior resection varies. Monofilament stainless steel wire suture is an inert suture, has excellent holding power, and is associated with a low probability of wound infection. Side-to-end coloproctostomy for anastomotic reconstruction after anterior resection has proved to be a satisfactory alternative to the usual end-to-end anastomosis. A combination of wire suture with side-to-end coloproctostomy was performed in 60 consecutive anterior resections in which there were two clinical anastomotic leaks and no deaths attributable to anastomotic dehiscence. Simultaneous loop transverse colostomy was performed in 13 cases (22%), and all colostomies were subsequently closed without difficulty. This technique is recommended for reconstruction of bowel continuity after anterior resection of the rectum.     

Carotid stump syndrome: a colour-coded Doppler flow study

Colour-coded Doppler flow imaging (angiodynography) was performed on 29 patients with 30 internal carotid artery occlusions. Large internal carotid stumps were revealed as intravascular cul-de-sacs demonstrating vortices of blue flow reversal. Large carotid stumps or significant external carotid stenoses were present in nine patients (9 arteries). Such patients were significantly more likely to develop symptoms of cerebral ischaemia during follow up which averaged 18 months (P = 0.016; Fisher exact). These results support the concept of embolisation from the carotid bifurcation (residual stump or external stenosis) as a cause of episodic cerebral ischaemia following internal carotid occlusion. Angiodynography may prove to be a useful tool for selecting appropriate patients for treatment.