Janet L. Engstrom

Accuracy of self-reported height and weight in women: an integrative review of the literature.

Height and weight are two of the most commonly used anthropometric measurements in clinical practice and research. Self-reported height and weight measurement is a simple, efficient, inexpensive, and non-invasive method of collecting data from large numbers of people. This integrative review of the published research examined the accuracy of self-reported height and weight measurements in women. Twenty-six studies examined the accuracy of self-reported height in 39,244 women. Twenty-one of the studies found that women overestimate height. Thirty-four studies reviewed the accuracy of self-reported weight in 57,172 women, and all 34 studies reported that women underestimated weight. Although mean variations between self-reported and measured values were small, a significant percentage of women in study groups had very large errors. Inaccurate measurements of both height and weight can cause significant inaccuracies in calculation of body mass index, which is used as a guide for identifying persons at risk for disease. These findings indicate that direct measurement of height and weight should be performed whenever possible for optimal measurements in clinical practice and clinically oriented research.

Accuracy of methods for calculating postnatal growth velocity for extremely low birth weight infants.

Objective. No uniform method for calculating growth velocity (GV) (grams per kilogram per day) among extremely low birth weight (ELBW) infants has been reported. Because the calculation of actual GV is so labor intensive, investigators have estimated GV with varying approaches, making comparisons across studies difficult. This study compares the accuracy of 3 mathematical methods used for estimating average GV, namely, 2-point models using the difference between weights at 2 time points divided by time and weight (either birth weight [BW] or average weight), linear regression models that are normalized for either BW or average weight, and an exponential model. The accuracy of all models was compared with actual GVs calculated from daily weight measures for a group of ELBW infants. Methods. Actual GVs were calculated from daily weights for 83 ELBW infants admitted to the special care nursery and were compared with estimated GVs from each of the 5 models for the same infants. Results. The exponential model, using weights from 2 time points, ie, GV = [1000 × ln(Wn/W1)]/(Dn − D1), was extremely accurate, with mean absolute errors of 0.02% to 0.10%. The 2-point and linear models were highly inaccurate when BW was used in the denominator, with mean absolute errors of 50.3% to 96.4%. The 2-point and linear models were fairly accurate when average weight was used in the denominator, with mean absolute errors of 0.1% to 8.97%. Additional analyses showed that the accuracy of the 2-point and linear model estimates was affected significantly by the combination of BW, length of stay, and chronic lung disease, whereas the exponential model was not affected by these combined factors. Conclusions. GV estimates calculated with 3 commonly used models varied widely, compared with actual GVs; however, the exponential model estimates were extremely accurate. The exponential model provides the accuracy and ease of use that are lacking in current methods applied to infant growth research.

Nipple Shields for Preterm Infants: Effect on Milk Transfer and Duration of Breastfeeding

This study reports breastfeeding outcomes for 34 preterm infants whose mothers used ultra-thin silicone nipple shields to increase milk transfer. Mean milk transfer was compared for 2 consecutive breastfeedings without and with the nipple shield. Total duration of breastfeeding was calculated for a maximum of 365 days. Mean milk transfer was significantly greater for feedings with the nipple shield (18.4 ml vs. 3.9 ml), with all 34 infants consuming more milk with the nipple shield in place. Mean duration of nipple shield use was 32.5 days, and mean duration of breastfeeding was 169.4 days; no association between these variables was noted. The nipple shield was used for 24.3% of the total breastfeeding experience, with no significant association between the percentage of time the shield was used and total duration of breastfeeding. These findings are the first to indicate that nipple shield use increases milk intake without decreasing total duration of breastfeeding for preterm infants.

Impact of early human milk on sepsis and health-care costs in very low birth weight infants

Objective:To study the incidence of sepsis and neonatal intensive care unit (NICU) costs as a function of the human milk (HM) dose received during the first 28 days post birth for very low birth weight (VLBW) infants.Study design:Prospective cohort study of 175 VLBW infants. The average daily dose of HM (ADDHM) was calculated from daily nutritional data for the first 28 days post birth (ADDHM-Days 1–28). Other covariates associated with sepsis were used to create a propensity score, combining multiple risk factors into a single metric.Result:The mean gestational age and birth weight were 28.1±2.4 weeks and 1087±252 g, respectively. The mean ADDHM-Days 1–28 was 54±39 ml kg−1 day−1 (range 0–135). Binary logistic regression analysis controlling for propensity score revealed that increasing ADDHM-Days 1–28 was associated with lower odds of sepsis (odds ratio 0.981, 95% confidence interval 0.967–0.995, P=0.008). Increasing ADDHM-Days 1–28 was associated with significantly lower NICU costs.Conclusion:A dose–response relationship was demonstrated between ADDHM-Days 1–28 and a reduction in the odds of sepsis and associated NICU costs after controlling for propensity score. For every HM dose increase of 10 ml kg−1 day−1, the odds of sepsis decreased by 19%. NICU costs were lowest in the VLBW infants who received the highest ADDHM-Days 1–28.

A Pilot Study to Determine the Safety and Feasibility of Oropharyngeal Administration of Own Mother’s Colostrum to Extremely Low Birth Weight Infants

&NA;Own mothers colostrum is rich in cytokines and other immune agents that may stimulate oropharyngeal-associated lymphoid tissue if administered oropharyngeally to extremely low-birth-weight (ELBW) infants during the first days of life when enteral feeding is contraindicated. However, the safety and feasibility of the oropharyngeal route for the administration of colostrum have not been determined. PURPOSE:To determine the safety of oropharyngeal administration of own mothers colostrum to ELBW infants in first days of life. A secondary purpose was to investigate the feasibility of (1) delivering this intervention to ELBW infants in the first days of life and (2) measuring concentrations of secretory immunoglobulin A and lactoferrin in tracheal aspirate secretions and urine of these infants. SUBJECTS:Five ELBW infants (mean birth weight and gestational age = 657 g and 25.5 weeks, respectively). DESIGN:Quasi-experimental, 1 group, pretest-posttest design. METHODS:Subjects received 0.2 mL of own mothers colostrum administered oropharyngeally every 2 hours for 48 consecutive hours, beginning at 48 hours of life. Concentrations of secretory immunoglobulin A and lactoferrin were measured in tracheal aspirates and urine of each subject at baseline, at the completion of the intervention and again 2 weeks later. RESULTS:All infants completed the entire treatment protocol, each receiving 24 treatments. A total of 15 urine specimens were collected and 14 were sufficient in volume for analysis. A total of 15 tracheal aspirates were collected, but only 7 specimens (47%) were sufficient in volume for analysis. There was wide variation in concentrations of secretory immunoglobulin A and lactoferrin in urine and tracheal aspirates among the 5 infants; however, several results were outside the limits of assay detection. All infants began to suck on the endotracheal tube during the administration of colostrum drops. Oxygen saturation measures remained stable or increased slightly during each of the treatment sessions. There were no episodes of apnea, bradycardia, hypotension, or other adverse effects associated with the administration of colostrum. CONCLUSIONS:Oropharyngeal administration of own mothers colostrum is easy, inexpensive, and well-tolerated by even the smallest and sickest ELBW infants. Future research should continue to examine the optimal procedure for measuring the direct immune effects of this therapy, as well as the clinical outcomes such as infections, particularly ventilator-associated pneumonia.

Calculating postnatal growth velocity in very low birth weight (VLBW) premature infants

Objective:Currently, there is no standardized approach to the calculation of growth velocity (GV; g kg –1 day–1) in hospitalized very low birth weight (VLBW) infants. Thus, differing methods are used to estimate GV, resulting in different medical centers and studies reporting growth results that are difficult to compare. The objective of this study was to compare actual GV calculated from infant daily weights during hospitalization in a Neonatal Intensive Care Unit (NICU) with estimated GV using two mathematical models that have been shown earlier to provide good estimated GVs in extremely low birth weight (ELBW) infants: an exponential model (EM) and a 2-Point model (2-PM).Study Design:Daily weights from 81 infants with birth weights (BWs) of 1000 to 1499 g were used to calculate actual GV in daily increments from two starting points: (1) birth and (2) day of life (DOL) of regaining BW. These daily GV values were then averaged over the NICU stay to yield overall NICU GV from the two starting points. We compared these actual GV with estimated GV calculated using the EM and 2-PM methods.Results:The mean absolute difference between actual and EM estimates of GV showed <1% error for 100% of infants from both starting points. The mean absolute difference between actual and 2-PM estimates showed <1% error for only 38 and 44% of infants from birth and regaining BW, respectively. The EM was unaffected by decreasing BW and increasing length of NICU stay, whereas the accuracy of the 2-PM was diminished significantly (P<0.001) by both factors.Conclusion:In contrast to the 2-PM, the EM provides an extremely accurate estimate of GV in larger VLBW infants, and its accuracy is unaffected by common infant factors. The EM has now been validated for use in all VLBW infants to assess growth and provides a simple-to-use and consistent approach.

The accuracy of test weighing for preterm infants.

A series of recent studies has suggested that preterm infants are capable of breast feeding at weights <1,500 g. However, estimating intake during breast feeding for these small infants is important for safe clinical practice and valid research. The purpose of this study was to compare the accuracy of test weighing as an estimate of intake for preterm infants using two types of scales: a mechanical scale (Toledo) commonly used in many special care nurseries, and a new electronic scale (SMART; Olympic Medical). Fifty clinically stable preterm infants, weighing between 1,088 and 2,440 g (mean =1,599 g), who were clothed identically for all weights and feedings, were studied. Two experienced neonatal nurses (RN-1 and RN-2) collected the data. Before feeding, each infant was weighed once on each scale by each nurse; the order of nurse and scale was assigned randomly. Then, RN-1 administered a prescribed volume of feeding. After feeding, RN-2 weighed each infant twice on each scale; the order of scale was assigned randomly. RN-1 was blind to postfeed weights, and RN-2 was blind to actual volume of intake. Results indicated that differences between the actual and estimated volumes of intake were smaller for the electronic than for the mechanical scale on all measures. These findings suggest that test weighing with an electronic scale provides an accurate estimate of intake for preterm infants, and support the use of this instrument in clinical practice and research.

Supporting Breastfeeding in the Neonatal Intensive Care Unit : Rush Mother’s Milk Club as a Case Study of Evidence-Based Care

The translation of the evidence for the use of human milk (HM) in the neonatal intensive care unit (NICU) into best practices, toolkits, policies and procedures, talking points, and parent information packets is limited, and requires use of evidence-based quality indicators to benchmark the use of HM, consistent messaging by the entire NICU team about the importance of HM for infants in the NICU, establishing procedures that protect maternal milk supply, and incorporating lactation technologies that take the guesswork out of HM feedings and facilitate milk transfer during breastfeeding.

Mothers performing in-home measurement of milk intake during breastfeeding of their preterm infants: maternal reactions and feeding outcomes.

This study compares feeding outcomes and perceptions of mothers using in-home test weights and those who did not use test weights to manage breastfeeding of their preterm infants during the first month after hospital discharge. There were no significant differences in daily weight gain between the 2 groups during the study period. Maternal concerns cited in both groups were similar, namely, knowing how much milk infant is taking, infant gaining adequate weight, and infant getting enough milk. All women in the experimental group and two-thirds in the control group reported that in-home measurement of milk intake by test-weighing had been or would have been helpful. This prospective randomized study demonstrated that mothers of premature infants who performed in-home test-weighing procedures found the technique to be helpful and experienced no increased stress or lower achievement of breastfeeding goals when compared to mothers not performing test weighs.

“They’ve Walked in My Shoes”: Mothers of Very Low Birth Weight Infants and Their Experiences With Breastfeeding Peer Counselors in the Neonatal Intensive Care Unit

The effectiveness of the breastfeeding peer counselor role is thought to be embedded in the relationship between new and experienced mothers. In this study, new mothers of very low birth weight infants emphasized that one of the most important aspects of their relationship with the breastfeeding peer counselors is the peer or shared experience of how difficult it can be to provide milk and breastfeed while coping with the emotional stress of having an infant in the neonatal intensive care unit. This study provides evidence for the promotion and facilitation of lactation for mothers of neonatal intensive care unit infants through the use of breastfeeding peer counselors who are peers by virtue of the shared experience of providing milk for an infant hospitalized in the neonatal intensive care unit.