Intensive insulin therapy with insulin lispro: a randomized trial of continuous subcutaneous insulin infusion versus multiple daily insulin injection

OBJECTIVE

To evaluate glycemic control, hypoglycemic events, and quality of life in patients treated with continuous subcutaneous insulin infusion (CSII) and multiple daily insulin injection (MDI), with insulin lispro as the principal insulin.

RESEARCH DESIGN AND METHODS

This clinical trial enrolled 27 patients with type 1 diabetes. They were randomly assigned to CSII (n = 13) or MDI (n = 14) treatment regimens. Glycemic control (HbA(1c) level) was the primary outcome and was measured monthly for 9 months. Secondary outcomes were patient reports of hypoglycemic events (recorded monthly for 9 months) and quality of life assessed at 9 months using the Diabetes Quality of Life (DQOL) questionnaire.

RESULTS

A significant decrease in HbA(1c) from baseline was shown for both groups. However, the overall treatment effect (CSII - MDI) for HbA(1c) was +0.08% (95% CI -0.23 to +0.39, P > 0.10). This was significantly less than the a priori limit of +/-0.5% (P = 0.004). The relative treatment effect ([CSII - MDI]/MDI) for the overall number of hypoglycemic events was +9% (95% CI -37 to +87, P > 0.10). There were no statistically significant differences between treatment groups for any of the DQOL subscales.

CONCLUSIONS

No statistically significant differences in glycemic control, reported hypoglycemic events, or quality of life were found in this study. Furthermore, a clinically significant difference of more than +/-0.5% HbA(1c) between the two regimens can be confidently ruled out. We conclude that the choice of intensive insulin therapy should be a matter of patient preference, consistent with lifestyle.

Comparison of a nested polymerase chain reaction--restriction fragment length polymorphism method, the PATH antigen detection method, and microscopy for the detection and identification of malaria parasites

A nested polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) method, the PATH antigen detection method, and light microscopy were compared for their capacity to detect and identify Plasmodium species. One hundred and thirty-six blood specimens obtained from patients suspected of having malaria were examined by each of the three methods. Forty-four specimens were positive for malaria using microscopy as the "gold standard". The sensitivity for nested PCR was 100%, and the specificity was 98%. For the detection of Plasmodium falciparum, the antigen detection method had a sensitivity of 100% and a specificity of 97%. Species identification obtained using PCR-RFLP was identical or superior to light microscopy in 42 cases (96%). Although the nested PCR-RFLP method was more sensitive and specific, the rapid turnaround time and high sensitivity of the antigen detection method makes it a useful adjunct to standard microscopy.

Comparison of HER2/neu status assessed by quantitative polymerase chain reaction and immunohistochemistry

We prospectively evaluated a series of 254 breast cancers by quantitative polymerase chain reaction (PCR) and immunohistochemistry using 3 antibodies: HercepTest, CB11, and TAB250. DNA was extracted from a 10-micron tumor section for PCR, and 4-micron serial sections were taken from the same block for immunohistochemistry. The immunohistochemical results were scored using a semiquantitative immunohistochemical system. A positive tumor by immunohistochemistry had a score of 5 or more. The manufacturer's recommended scoring system was used for the HercepTest. Tumors were positive for gene amplification if the ratio of the HER2/neu gene to control gene after normalization was 2 or more. Of 254 cases, 61 showed gene amplification. For immunohistochemistry, 23% of tumors were positive with CB11, 27% with TAB250, and 37% with the HercepTest. Results for each antibody were compared with PCR results. The overall concordance for the HercepTest was 82%, which was significantly lower than that for CB11 (88%) or TAB250 (87%). The specificity for the HercepTest was 80% compared with 90% for TAB250 and 93% for CB11, while the positive predictive value for the HercepTest was 57% compared with 71% and 76% for TAB250 and CB11, respectively.

Cigarette smoking and the risk of thyroid cancer

Thyroid cancer, whose aetiology is largely uncertain, has been negatively associated with cigarette smoking in a number of studies, possibly consistent with the greater occurrence of the disease in women than in men. This association was explored in the context of a Canadian case-control study of thyroid cancer. Newly diagnosed cases were identified primarily through provincial cancer registries in Canada and controls were identified from the general population. Data were collected through mailed questionnaires, yielding 1224 cases and 2659 controls. Reduced risk was observed for ever/never cigarette smoking (risk ratio estimate (RR) of 0.71 (95% confidence interval (CI)=0.60-0.83) for females and 0.77 (95% CI=0.58-1.02)) for males. Dose-response effects were observed with duration, quantity smoked and pack-years of exposure, although there was no decreasing protective effect with the age started smoking or years since stopped smoking. There is evidence of reduced risk for all histological subgroups. The protective effect of smoking may be due to a number of different mechanisms, including an effect on thyroid stimulating hormone and on oestrogen metabolism.

Effects on subject response of information brochures and small cash incentives in a mail-based case-control study

PURPOSE

To investigate the impact on subject response of an information brochure and cash incentives included with mailed questionnaires in case-control studies.

METHODS

A randomized trial was carried out within a case-control study investigating cancer in the Province of Ontario. Brochures were included with half of the mailed questionnaires sent to 7487 cases and 2561 controls. Controls were also sent cash incentives of $2, $5, or no money.

RESULTS

With the brochure, response changed from 75.0% to 75.8% in cases, and from 70.3% to 71.1% in controls. Adjusting for differences in age, residence, sex, and cancer site/status, the change was 0.2% [95% confidence interval (CI) = -1.7-2.1] in cases, and 0.6% (95% CI = -3.1-4.3) in controls. The $2 and $5 incentives increased overall response in controls from 61.9% to 72.8% and 77.2%, respectively, i.e., by 10.9% (95% CI = 6.1-15.6) and 15.1% (95% CI = 10.4-19.7), after adjustment. This effect was largely confined to urban areas (for $2 and $5, respectively: 5.5% and 14.2% in Toronto, 15.3% and 20.4% in other urban areas vs. 2.7% and 1.0% in rural areas; p = 0.02). Response time showed little or no improvement when the brochure was included, but was markedly reduced for both the $2 and $5 incentives.

CONCLUSIONS

Cash incentives can improve subject response in epidemiologic studies, whereas information brochures do not appear to have an effect.

Casemix is coming

Casemix is the term used to describe the types of patients being treated in hospitals. During the 1980s, the main casemix classification adopted in Australia utilised diagnosis related groups (DRGs) and Australian Governments are now moving towards output-based funding of hospitals using DRGs. Changes to hospital funding mechanisms, increased focus on the output or product of hospital services and the availability of more information linking service provision to costs will have an impact on all nurses employed in hospital settings.

Phaeochromocytoma and cardiomyopathy

This case report describes a patient who presented with severe biventricular cardiac failure and shock, whose cardiac function returned to normal after the removal of a noradrenaline-secreting benign phaeochromocytoma. A catecholamine-induced cardiomyopathy with cardiogenic shock, rather than catecholamine-mediated peripheral vasoconstriction alone, is postulated as a mechanism to account for the marked hypoperfusion.