Subjective and objective nutritional assessment: nurses' role and the effect of cultural differences

BACKGROUND

Even though the nutritional assessment of chronically ill patients has a significant effect on outcomes, nurses' time constraints in clinical encounters may make the process impractical. Also, cultural background has an effect on nutritional assessment. Patient nutritional self-assessment can ease some of the nurses' workload.

OBJECTIVES

To compare tools for subjective and objective nutritional assessment and to examine cultural differences in nutritional assessment between Jews and Arabs living in Israel.

METHODS

The research design was cross-sectional; data were collected from Jews and Arabs with chronic illnesses living in the community during their visit to a public health clinic. The admitting nurse performed an objective nutritional assessment (Mini Nutritional Assessment (MNA)) after the patients completed the Subjective Nutritional Assessment (SANS). The data were analyzed using descriptive statistics, Pearson's correlation coefficients were calculated to test the relationships between the variables, and independent student t-tests were used to compare the means and differences between groups. The diagnostic accuracy of the MNA and of the SANS was determined using the area under the curve (AUC) analysis of receiver operating characteristic (ROC) curves. The agreement between the MNA and SANS measurements was estimated by a Bland Altman plot. The level of significance employed throughout the analysis was 0.05.

RESULTS

The sample was a convenience sample of 228 chronically ill patients, consisting of 121 Arabs and 107 Jews. A significant correlation was found between the subjective and objective nutritional assessments. The Bland-Altman plot demonstrated that the SANS and the MNA have a high level of agreement. Using the area under the curve (AUC) analysis of receiver operating characteristic (ROC) curves, showed an moderate diagnostic accuracy (73 % sensitivity and 30 % specificity).

CONCLUSIONS

Since the patient-completed nutritional assessment requires minimal time investment by nurses and we found a significant correlation and evidence for the accuracy and agreement of the objective and subjective assessments, further studies should assess and validate the possibility of replacing the objective nutritional assessment by the subjective assessment. Cultural background has a significant effect on patients' nutritional self-assessment; hence, culture should be considered as part of the nutritional assessment.

Validation of carbon dioxide production (VCO2) as a tool to calculate resting energy expenditure (REE) in mechanically ventilated critically ill patients: a retrospective observational study

BACKGROUND

Indirect calorimetry (IC) measurement is considered the gold standard for the assessment of resting energy expenditure (REE). It is based on the measurement of oxygen and carbon dioxide consumption (VO2 and VCO2, respectively). However, its use is limited by cost and technical issues. It has been proposed that, in critically ill patients, the analysis of VCO2 obtained from the ventilator alone may be used as an accurate method to assess REE in ventilated patients. This retrospective study aimed to assess the accuracy of VCO2 measurement alone in the determination of REE.

METHODS

This was a retrospective study conducted at the general intensive care unit of a single university-affiliated tertiary medical center. Patients included were invasively ventilated and their REE was measured by using IC. The respiratory quotients (RQs) were set at 0.8, 0.85, and 0.89. Data were collected from computerized patient files. REE obtained from the ventilator by using VCO2 (REE-VCO2) alone was compared with REE obtained from IC (REE-IC).

RESULTS

Measurements were obtained for 80 patients, and 497 REE-IC measurements were compared with REE-VCO2 obtained at the same time. The mean REE-IC was 2059.5 ± 491.7 kcal/d. The mean REE-RQs corresponding to RQs of 0.80, 0.85, and 0.89 were 1936.8 ± 680.0, 2017.8 ± 708.8, and 2122.1 ± 745.4 kcal/d, respectively. REE-VCO2 derived from an RQ of 0.85 had the lowest mean difference from REE-IC. Whereas accuracy was higher using an RQ of 0.85, agreement (between 85% and 115%) was highest using an RQ of 0.89.

CONCLUSIONS

The level of agreement of REE obtained from VCO2 readings with REE obtained from IC was generally low. IC continues to be the recommended method for REE assessment.

Randomised clinical trial: 2% taurolidine versus 0.9% saline locking in patients on home parenteral nutrition

BACKGROUND

The catheter lock solutions 2% taurolidine and 0.9% saline are both used to prevent catheter-related bloodstream infections (CRBSIs) in home parenteral nutrition patients.

AIMS

To compare the effectiveness and safety of taurolidine and saline.

METHODS

This multicentre double-blinded trial randomly assigned home parenteral nutrition patients to use either 2% taurolidine or 0.9% saline for 1 year. Patients were stratified in a new catheter group and a pre-existing catheter group. Primary outcome was the rate of CRBSIs/1000 catheter days in the new catheter group and pre-existing catheter group, separately.

RESULTS

We randomised 105 patients, of which 102 were analysed as modified intention-to-treat population. In the new catheter group, rates of CRBSIs/1000 catheter days were 0.29 and 1.49 in the taurolidine and saline arm respectively (relative risk, 0.20; 95% CI, 0.04-0.71; P = 0.009). In the pre-existing catheter group, rates of CRBSIs/1000 catheter days were 0.39 and 1.32 in the taurolidine and saline arm respectively (relative risk, 0.30; 95% CI, 0.03-1.82; P = 0.25). Excluding one outlier patient in the taurolidine arm, mean costs per patient were $1865 for taurolidine and $4454 for saline (P = 0.03). Drug-related adverse events were rare and generally mild.

CONCLUSIONS

In the new catheter group, taurolidine showed a clear decrease in CRBSI rate. In the pre-existing catheter group, no superiority of taurolidine could be demonstrated, most likely due to underpowering. Overall, taurolidine reduced the risk for CRBSIs by more than four times. Given its favourable safety and cost profile, taurolidine locking should be considered as an additional strategy to prevent CRBSIs.

TRIAL REGISTRATION

Clinicaltrials.gov, identifier: NCT01826526.

Fight against malnutrition: The results of a 2006-2012 prospective national and global nutritionDay survey

BACKGROUND

The nutritionDay (nD) initiative has been promoted by the European Society for Clinical Nutrition and Metabolism (ESPEN) to assess and audit the nutritional status of hospitalized patients, as well as to promote awareness. Israel has been participating annually in this project since 2006.

OBJECTIVES

To evaluate the proportion of malnourished patients in Israel in comparison with the rest of the world.

METHODS

Data were collected by staff members and the hospitalization outcomes were followed up at day 30. The data were analyzed by the Vienna coordinating center, using "my SQL" (Structured Query Language), an open source relational database management system and analyzed, using SAS (Statistical Analysis System) version 9.2.

RESULTS

In Israel, 2303 patients (in 114 various medical specialty units) were included in the study during a 7-year survey, while 4316 units recruited 91,351 patients in the world (W), between 2006 and 2012, The median age of patients was 68 years, with 44% of females and BMI of 27 ± 6 (25 in W). Israel had a higher proportion of nutrition care teams per patient (in 88% of the units) than W (71%) (p < 0.05). 43% of the patients had a weight loss within the last 3 months prior to admission (same for W); 36.7% described a decrease in eating more than 50% of their normal food intake (21.3% in W). Food intake at nD showed that 51.4% of the patients ate half to nothing of the served meal (56.2% in W). In Israel, more patients received hospital modified diets (13% vs. 8.2% in W), but less supplements (5.7% vs. 8.3% in W) or enteral/parenteral nutrition (9.0% vs. 13.5% in W, p < 0.05). Length of hospital stay was shorter in Israel (11 days vs. 14 days in W, p < 0.05) and mortality was similar (3.9% vs. 3.8% in W).

CONCLUSION

Malnutrition of hospitalized patients in Israel was found comparable to the rest of the world. However, in Israel in spite of the higher nutrition staff member/patient ratio there was no increase in the administration of supplements or artificial nutrition to malnourished patients in the surveyed units. Also, the length of hospital stay was shorter and was not associated with an increase in mortality.