Estimated moments at L5/S1 level and muscular activation of back extensors for six prone back extension exercises in healthy individuals

The purpose of this study was to identify the prone back extension (PBE) exercises that offer the most resistance to the back extensor muscles. Twenty males with no previous history of low back injury performed two repetitions of eight exercises. These consisted of two maximal isometric voluntary activations (MVA) and six different PBE exercises. The participants, while lying prone on a bench, were asked to raise either their trunk or legs to the horizontal position and hold for one second (static phase) before returning to the original position. The exercises differed according to the particular segments that were raised into extension. To assess the PBE exercises, a biomechanical model was used to estimate the level of load resistance (%MVA) relative to the maximum voluntary activation strength (MVA). In addition, electromyography (EMG) was included to measure the level of muscle activity (%MVE) relative to the maximum voluntary activation EMG (MVE) value reached during the MVA. A significant relationship of 0.86 was found between the mass of the subject and the peak reaction moment during the MVA. Peak level of load resistance averaged around 50% MVA with the exception of exercise no. 5 where the subject had to raise in extension his trunk, legs and arms (65% MVA). The erector spinae (ES) activity level reached a peak value of 61% MVE for exercise no. 5. In the exercises where only the trunk was lifted, the peak level of ES was below 47% MVE and the average activity during the static phase reached approximately 26% MVE. For healthy individuals PBE exercises can be considered low intensity exercises (< 50% MVA; except exercise no. 5) and can be used to improve the endurance of the back muscles.

Use of clinical pictures in the management of nausea and vomiting: a prospective audit

This prospective audit aimed to evaluate a guideline for the management of nausea and vomiting in palliative care inpatients. Clinical pictures were used to guide diagnosis and treatment, with potentially reversible causes being addressed where appropriate. Over a 3-month period, 40 patient episodes occurred, all of which were included in the audit. The commonest clinical pictures were gastric stasis/outlet obstruction (35%) and chemical/metabolic (30%). Management according to the guideline was effective. Nausea was abolished in 28 of 34 cases (82%) and vomiting resolved completely in 26 of 31 cases (84%). Symptoms were totally controlled in a mean time of 3.4 days. Nausea and vomiting, although distressing symptoms, can be controlled in the majority of cases. Multi-centre prospective audit, using a standardized tool, may prove useful in allowing larger numbers of patients to be systematically analysed and individual centres to compare outcomes.

Impact of a guideline-based disease management team on outcomes of hospitalized patients with congestive heart failure

BACKGROUND

Congestive heart failure is the most common reason for hospitalization in the United States, and guidelines to improve the quality of care for patients with congestive heart failure have been developed. However, adherence is typically low. We hypothesized that a guideline-based care management team would result in greater quality and efficiency of care than guidelines alone.

METHODS

A faculty cardiologist and nurse care manager at an academic medical center reviewed each patient's data and made guideline-based recommendations. Hospital length of stay, total costs, and use of recommended guidelines were compared between 173 patients before team implementation but with available guidelines, 283 care-managed patients, and 126 concurrent non-care-managed patients.

RESULTS

Care-managed patients achieved higher rates of use of angiotensin-converting enzyme inhibitor than baseline or non-care-managed patients (95%, 60%, and 75%, respectively; P<.001), as well as increased adherence to guidelines for daily weight monitoring and assessment of left ventricular function. Hospital length of stay was lower (median, 3, 4, and 5 days, respectively; P<.001) as were costs of hospitalization (median, $2934, $3209, and $4830, respectively; P<.01). These differences persisted after adjustment for severity of illness.

CONCLUSIONS

When compared with dissemination of guidelines alone, an active care management approach was associated with significant improvements in quality and efficiency of care for hospitalized patients with congestive heart failure.

Carboxyl methylation of the phosphoprotein phosphatase 2A catalytic subunit promotes its functional association with regulatory subunits in vivo

The phosphoprotein phosphatase 2A (PP2A) catalytic subunit contains a methyl ester on its C-terminus, which in mammalian cells is added by a specific carboxyl methyltransferase and removed by a specific carboxyl methylesterase. We have identified genes in yeast that show significant homology to human carboxyl methyltransferase and methylesterase. Extracts of wild-type yeast cells contain carboxyl methyltransferase activity, while extracts of strains deleted for one of the methyltransferase genes, PPM1, lack all activity. Mutation of PPM1 partially disrupts the PP2A holoenzyme in vivo and ppm1 mutations exhibit synthetic lethality with mutations in genes encoding the B or B' regulatory subunit. Inactivation of PPM1 or overexpression of PPE1, the yeast gene homologous to bovine methylesterase, yields phenotypes similar to those observed after inactivation of either regulatory subunit. These phenotypes can be reversed by overexpression of the B regulatory subunit. These results demonstrate that Ppm1 is the sole PP2A methyltransferase in yeast and that its activity is required for the integrity of the PP2A holoenzyme.

Bringing both sides together

It began in 1992, with two men walking out of a television studio. Colin Blakemore, Oxford Professor of Physiology, is a quiet-spoken, eloquent defender of the use of animals in medical research. Les Ward, Director of the Edinburgh-based Advocates for Animals, is a passionate opponent of animal use. Bringing them together in front of an invited audience with strong opinions on both sides would make the sparks fly and be good viewing. But Blakemore and Ward, retiring after yet another bout that neither side won, were dissatisfied. Both knew that media debates gave them a chance to highlight the flaws and evasions in the other side's arguments, and perhaps to recruit some new supporters to their own. But Ward realized that this was not enough to achieve the radical change he wanted: replacement of animals by other methods. And Blakemore disliked defending animal experiments against all comers. He too wanted to replace animals, albeit only when this could be done without forgoing the real benefits of research.

Plasma homocysteine levels in 10 patients with polycythemia

Polycythemia and hyperhomocysteinemia are risk factors for thrombosis. Since red blood cells actively metabolize methionine to homocysteine, we investigated whether or not patients with polycythemia have increased plasma levels of homocysteine, which might contribute to their increased thrombotic risk. In ten patients with polycythemia, the plasma homocysteine levels were measured before phlebotomy, three days after the procedure and 1-2 months later. The baseline mean plasma homocysteine levels in patients (9.7 +/- 1.6 mumol/L [+/-SD]) did not differ significantly from that found in 30 sex- and age-matched healthy controls (12.2 +/- 6.9). Despite a fall in the patients' mean [+/-SD] hematocrit from 0.50 +/- 0.02 at baseline to 0.47 +/- 0.03 three days after phlebotomy (significant at 95%) and to 0.48 +/- 0.02 after 1 to 2 months (not significant), the mean plasma homocysteine levels did not change significantly (9.9 +/- 2.3 mumol/L at 3 days and 9.7 +/- 2.1 mumol/L at 1-2 months). It is unlikely that high plasma homocysteine levels contribute to the increased thrombotic risk of polycythemic patients.

Adenocarcinoma of the cervix: a regional retrospective study

A retrospective study using data from the Yorkshire Cancer Registry was undertaken to investigate the incidence, characteristics and prognosis of cases of cervical adenocarcinoma in the Yorkshire Region. Three hundred and twenty-six women resident in the Yorkshire Region formed the basis of the study. The overall five year survival for adenocarcinoma of the cervix is 53%. This was influenced by stage, lymph node involvement and differentiation. 37 out of 122 surgically treated patients received inappropriate treatment. There is a need for improved data collection in the treatment of these patients. This lends weight to the argument that cancer of the cervix should be managed in cancer units.

The relationship between age and the use of DNR orders in critical care patients. Evidence for age discrimination

OBJECTIVE

To determine whether a relationship exists between the use of do-not-resuscitate (DNR) orders in the intensive care unit and the age of the patient after controlling for the severity of illness.

METHODS

Patients from the Mortality Probability Model database, which includes 6103 patients in 4 large hospitals, and from a second database, which includes 3226 additional patients in 25 hospitals, were analyzed through logistic regression seeking a relationship between age and DNR use. Adult medical and surgical intensive care units from 27 hospitals in the United States were included.

RESULTS

In the Mortality Probability Model database, 11.4% of the patients had DNR orders written. In the group of patients younger than 65 years, 8% had DNR orders. This percentage climbed rapidly with age. For age ranges of 65 to younger than 75 years, 75 to younger than 85 years, and 85 years or older, the percentage of patients who had a DNR order was 11.2%, 18.9%, and 32.6%, respectively. Similar results were found in the second database: 5.4% of patients had DNR orders and, again, the rise in the use of DNR orders was associated with increased age. For patients younger than 75 years, 4.2% had DNR orders. For the older groups, 75 to younger than 85 years and 85 years and older, the rates were 8.8% and 15.4%, respectively. Logistic regression was used to control for severity of illness; when compared with patients younger than 65 years, patients 75 to younger than 85 years were 50% more likely to have DNR orders written and patients 85 years or older were 140% more likely to have DNR orders written.

CONCLUSIONS

Older patients (> or = 75 years old) are significantly more likely than younger patients to have DNR orders written even after the severity of illness is controlled as a confounding variable. This association suggests age discrimination and becomes stronger as patient age increases.

Comparison of Super Stuff and paraffin wax bolus in radiation therapy of irregular surfaces

Irregular facial contours can make radiation therapy of head and neck tumors difficult. Isodose lines become skewed, making treatment planning complex. A traditional solution to this problem is the paraffin wax box bolus. Such a bolus is made to fit the irregular surface compensating for the topology and creating an even surface. The fabrication of a wax bolus can be a difficult and time-consuming process. A method that is simple and efficient has been devised. Super Stuff bolus can be easily molded and has approximately the same effect as a similar paraffin wax bolus. This was verified by irradiating a Rando head phantom with both a paraffin wax bolus and a Super Stuff bolus. Doses to various points of interest were measured with thermoluminescent dosimetry (TLD) chips (LiF). The particular case addressed is malignant melanoma of the nasal septum, but the technique described can be useful in the treatment of other sites as well.