Inter- and intra-examiner reliability of motion palpation for the thoracolumbar spine

An inter- and intra-examiner reliability study was conducted to determine the reliability of a standardized method of motion palpation. Eight senior students in the Palmer College Public Clinic palpated the thoracolumbar spine of 32 student volunteers. Each volunteer was palpated twice by each examiner to allow inter- and intra-examiner analysis. Each examiner had at least 1 yr of experience using the procedure. Only the most hypomobile motor unit of the spine was recorded. Analysis of the data revealed statistically significant agreement for intra-examiner reliability. Inter-examiner reliability was not statistically significant. T9-T10 was chosen significantly more often by the palpators as the most hypomobile motor unit.     

Antiestrogen chemoprevention of breast cancer: critical issues and research

Estrogenic hormones play critical roles in many aspects of women's health. Therefore, the impact of any hormonal manipulation must be carefully considered. While the evidence is good that chemoprevention, or more accurately chemosuppression, of breast cancer with tamoxifen is possible, further data are needed to support the case that hormone replacement with tamoxifen in healthy postmenopausal women would provide overall health benefits. Specifically, further data are needed regarding the biological effects of tamoxifen on risk factors for cardiovascular disease, on bone, on the liver, on the uterus, and on the coagulation system. Frequency, severity, and predictors for vasomotor, gynecologic, and depressant side effects also need to be well described. These data will allow rigorous cost-effectiveness analysis of hormone replacement therapies with tamoxifen and estrogen, as well as an analysis of the cost effectiveness of a clinical trial to prove definitively critical health benefits.     

Factors relating to the sensory acuity of limbs with peripheral vascular insufficiency

We examined several possible causes for the high incidence of poor sensory acuity in the limbs of 176 patients with moderate to severe peripheral vascular insufficiency. We investigated the relationships of diabetes, alcoholism, and smoking, as well as the severity of peripheral vascular disease, to the integrity of basic sensory modalities such as two-point discrimination and perception of light touch. The presence or absence of diabetes exerted the strongest effect on peripheral sensation. In patients who did not have diabetes, sensation in the limbs was most strongly affected by whether the patient was an alcoholic. Smoking did not have a significant effect on limb sensation. Among nondiabetic, nonalcoholic patients, there was a weak residual effect related to the severity of the peripheral vascular insufficiency. Even among these patients, however, systemic factors predominated in determining the loss of sensation. We also examined the extent to which loss of sensation might be related to the development of ulcers. Among patients who were not diabetic, there was a highly significant relationship between loss of sensation and the presence of limb ulceration. Surprisingly, however, there was no discernable relationship between the presence of ulcers in diabetic patients and the degree of loss of peripheral sensation. This result suggests that a large percentage of ulcers seen in diabetic patients are not of neurogenic origin.     

Effect of liposome surface charge on the stability of technetium (99mTc) radiolabelled liposomes

Using liposomes radiolabelled by the 99mTechnetium-stannous chloride technique we have investigated the effect of surface charge on the stability of the isotope in vitro and in vivo. Dialysis of 99mTc-labelled positive, negative and neutral liposomes, which had been incubated in either saline or normal rat serum showed no significant loss of the isotope from the liposome surface with only 2 per cent of the isotope dialysed. A comparison of gel chromatography with dialysis confirmed that most of the isotope remained attached to the liposome surface, but it did reveal greater loss of the isotope, between 15 and 23 per cent. The liposome clearance rates obtained from 125I-egg phosphatidylcholine (EPC) and 99mTc dual-labelled positive or neutral liposomes were significantly different. The 99mTc marker was cleared five times faster from the positive liposomes and twice as fast from the neutral liposomes as the 125I-EPC integral membrane marker. The 99mTc attached to liposomes with a negative surface charge was stable in vivo and had the same clearance rate from the circulation as the 125I-EPC marker. These results indicate that the commonly used in vitro techniques for assessing liposome radiolabel stability are unsuitable for predicting the stability of the 99mTc in vivo.     

Determinants of symptom interval in childhood cancer.

The duration of symptoms before diagnosis (lag time) was defined for 184 of 236 children diagnosed as having a malignancy at the Royal Hospital for Sick Children, Edinburgh for the time period January 1982 until December 1990. The natural logarithm of the lag time was correlated with age, gender, diagnostic group, white cell count in acute leukaemia, clinical stage of disease in solid tumours, and event free survival. Age was significantly associated with lag time, older children presenting later. In the diagnostic groups, mean lag time ranged from 2.8 weeks in nephroblastoma to 13.3 weeks for brain tumours. Diagnostic group was predictive for lag time after adjustment for age, with for example, a significantly longer lag time for those with brain tumours. However lag time was not predictive of event free survival and it is likely that lag time has other major determinants. When compared with previous studies, there also appears to be a regional variation in lag time for diagnostic groups. It seems likely that this is a reflection of geographical difference in the structure of health systems and is therefore yet another important determinant.