Barbara J. Stewart

Tracheobronchial aspiration of gastric contents in critically ill tube-fed patients: Frequency, outcomes, and risk factors

Objectives:To describe the frequency of pepsin-positive tracheal secretions (a proxy for the aspiration of gastric contents), outcomes associated with aspiration (including a positive Clinical Pulmonary Infection Score [a proxy for pneumonia] and use of hospital resources), and risk factors associated with aspiration and pneumonia in a population of critically ill tube-fed patients. Design:Prospective descriptive study conducted over a 2-yr period. Setting:Five intensive care units in a university-affiliated medical center with level I trauma status. Patients:Each of the 360 adult patients participated for 4 days. Among the inclusion criteria were mechanical ventilation and tube feedings. An exclusion criterion was physician-diagnosed pneumonia at the time of enrollment. Intervention:None. Measurements and Major Results:Almost 6,000 tracheal secretions collected during routine suctioning were assayed for pepsin; of these, 31.3% were positive. At least one aspiration event was identified in 88.9% (n = 320) of the participants. The incidence of pneumonia (as determined by the Clinical Pulmonary Infection Score) increased from 24% on day 1 to 48% on day 4. Patients with pneumonia on day 4 had a significantly higher percentage of pepsin-positive tracheal secretions than did those without pneumonia (42.2% vs. 21.1%, respectively; p < .001). Length of stay in the intensive care unit and need for ventilator support were significantly greater for patients with pneumonia (p < .01). A low backrest elevation was a risk factor for aspiration (p = .024) and pneumonia (p = .018). Other risk factors for aspiration included vomiting (p = .007), gastric feedings (p = .009), a Glasgow Coma Scale score <9 (p = .021), and gastroesophageal reflux disease (p = .033). The most significant independent risk factors for pneumonia were aspiration (p < .001), use of paralytic agents (p = .002), and a high sedation level (p = .039). Conclusions:Aspiration of gastric contents is common in critically ill tube-fed patients and is a major risk factor for pneumonia. Furthermore, it leads to greater use of hospital resources. Modifiable risk factors for aspiration need to be addressed.

The tinnitus functional index: development of a new clinical measure for chronic, intrusive tinnitus.

Objectives: Chronic subjective tinnitus is a prevalent condition that causes significant distress to millions of Americans. Effective tinnitus treatments are urgently needed, but evaluating them is hampered by the lack of standardized measures that are validated for both intake assessment and evaluation of treatment outcomes. This work was designed to develop a new self-report questionnaire, the Tinnitus Functional Index (TFI), that would have documented validity both for scaling the severity and negative impact of tinnitus for use in intake assessment and for measuring treatment-related changes in tinnitus (responsiveness) and that would provide comprehensive coverage of multiple tinnitus severity domains. Design: To use preexisting knowledge concerning tinnitus-related problems, an Item Selection Panel (17 expert judges) surveyed the content (175 items) of nine widely used tinnitus questionnaires. From those items, the Panel identified 13 separate domains of tinnitus distress and selected 70 items most likely to be responsive to treatment effects. Eliminating redundant items while retaining good content validity and adding new items to achieve the recommended minimum of 3 to 4 items per domain yielded 43 items, which were then used for constructing TFI Prototype 1. Prototype 1 was tested at five clinics. The 326 participants included consecutive patients receiving tinnitus treatment who provided informed consent—constituting a convenience sample. Construct validity of Prototype 1 as an outcome measure was evaluated by measuring responsiveness of the overall scale and its individual items at 3 and 6 mo follow-up with 65 and 42 participants, respectively. Using a predetermined list of criteria, the 30 best-functioning items were selected for constructing TFI Prototype 2. Prototype 2 was tested at four clinics with 347 participants, including 155 and 86 who provided 3 and 6 mo follow-up data, respectively. Analyses were the same as for Prototype 1. Results were used to select the 25 best-functioning items for the final TFI. Results: Both prototypes and the final TFI displayed strong measurement properties, with few missing data, high validity for scaling of tinnitus severity, and good reliability. All TFI versions exhibited the same eight factors characterizing tinnitus severity and negative impact. Responsiveness, evaluated by computing effect sizes for responses at follow-up, was satisfactory in all TFI versions. In the final TFI, Cronbach’s alpha was 0.97 and test–retest reliability 0.78. Convergent validity (r = 0.86 with Tinnitus Handicap Inventory [THI]; r = 0.75 with Visual Analog Scale [VAS]) and discriminant validity (r = 0.56 with Beck Depression Inventory-Primary Care [BDI-PC]) were good. The final TFI was successful at detecting improvement from the initial clinic visit to 3 mo with moderate to large effect sizes and from initial to 6 mo with large effect sizes. Effect sizes for the TFI were generally larger than those obtained for the VAS and THI. After careful evaluation, a 13-point reduction was considered a preliminary criterion for meaningful reduction in TFI outcome scores. Conclusions: The TFI should be useful in both clinical and research settings because of its responsiveness to treatment-related change, validity for scaling the overall severity of tinnitus, and comprehensive coverage of multiple domains of tinnitus severity.

Family caregiving skill: development of the concept.

Families increasingly are expected to provide complex care at home to ill relatives. Such care requires a level of caregiving knowledge and skill unprecedented among lay persons, yet family caregiving skill has never been formally developed as a concept in nursing. The purpose of the study reported here was to develop the concept of family caregiving skill systematically through qualitative analysis of interviews with patients (n = 30) receiving chemotherapy for cancer and their primary family caregivers (n = 29). Open coding and constant comparison constituted the analytic methods. Sixty-three indicators of caregiving skill were identified for nine core caregiving processes. Family caregiving skill was defined as the ability to engage effectively and smoothly in these nine processes. Properties of family caregiving skill also were identified. Conceptualizing skill as a variable and identifying indicators of varying levels of skill provides a basis for measurement and will allow clinicians to more precisely assess family caregiving skill.

Effects of caregiving demand, mutuality, and preparedness on family caregiver outcomes during cancer treatment.

PURPOSE/OBJECTIVES To test a model of family caregiving derived from the interactionist approach to role theory that hypothesized that three caregiving role implementation variables (caregiving demand, mutuality between caregivers and patients, and preparedness for caregiving) would predict multiple caregiving-specific and generic outcomes with different patterns of association across outcomes. DESIGN Descriptive, correlational. SETTING Surgical, radiation, and medical oncology settings. SAMPLE 87 family caregivers of adults receiving treatment for solid tumors or lymphoma. METHODS Caregivers completed the Demand and Difficulty subscales of the Caregiving Burden Scale; the Mutuality, Preparedness, and Global Strain scales of the Family Care Inventory; and the 30-item short form of the Profile of Mood States. Data were analyzed with simultaneous multiple regression. MAIN RESEARCH VARIABLES Caregiving demand, mutuality, preparedness, caregiving difficulty, global caregiver strain, tension, depression, anger, fatigue, vigor, confusion, and total mood disturbance. FINDINGS The model explained statistically significant proportions of variance in each outcome, with different patterns of association across outcomes. Demand was associated most strongly with caregiving difficulty and global strain. Mutuality was associated most strongly with caregiver anger. Unexpectedly, preparedness was associated more strongly with mood disturbance outcomes than with the caregiving-specific variables of difficulty and strain. CONCLUSIONS Further research should explore models that address implementation of the caregiving role to better elucidate how family caregivers learn and carry out the important role. IMPLICATIONS FOR NURSING Clinical assessment should include caregiving demand, the quality of the relationship between caregiver and patient, and preparedness for caregiving. Interventions could be tailored to meet caregiver needs in each area.

Sense of coherence as a predictor of quality of life in persons with coronary heart disease surviving cardiac arrest.

The unique contribution of sense of coherence to explained variance in quality of life was studied in 149 persons with coronary heart disease who survived cardiac arrest. Using hierarchical multiple regression, 16 predictors, including 5 social status variables related to poor health vulnerability, perceived social support, self-esteem, and 9 variables reflecting instability and work of the chronic illness trajectory, accounted for 50% of variance in quality of life. The addition of sense of coherence resulted in a 15% increment to the explained variance (total R2 = .64). As a strong independent predictor of quality of life, sense of coherence has promise as a variable that might be strengthened by nursing interventions and merits continued study.

Enrichment processes in family caregiving to frail elders.

Interview and observational data obtained from caregiver-care recipient dyads were analyzed in developin a theory of enrichment that explains how some families use pleasurable or meaningful experiences in their caregiving to frail elders. The personal history and frailty trajectory of both caregiver and care recipient, the quality of the dyadic relationship, and the caregiving situation are antecedents to enrichment processes. Core elements influencing the nature of enriching events include acquiring symbolic meaning, performing activity, and fine tuning. Categories of enrichment events are customary routines and innovative routine breakers. Consequences of enrichment are relationship and identity sustenance for both caregiver and care recipient, comfort for the care recipient, and rewards of meaning for the caregiver.

Establishing partnerships with family caregivers. Local and cosmopolitan knowledge.

Families now provide most of the care received by older people in the United States. Proposed changes in the health care system will mean that families must take an even greater role in delivering health care. It is crucial that nurses practicing in a variety of settings be prepared to establish partnerships with family caregivers in order to attend to the long-term care needs of older people.

Mutuality and preparedness moderate the effects of caregiving demand on cancer family caregiver outcomes.

Background: Family caregiving researchers have explored the moderating or stress-buffering effects of variables such as coping and social support. However, the quality of the family caregiver-patient relationship and preparedness for caregiving have received little attention as potential moderators. Objective: To explore whether relationship quality and preparedness moderate the effects of caregiving demand on caregiver outcomes during cancer treatment. Methods: Eighty-seven family caregivers of patients receiving treatment for cancer completed the Demand and Difficulty subscales of the Caregiving Burden Scale, Mutuality and Preparedness Scales of the Family Care Inventory, and the short form of the Profile of Mood States. Using hierarchical multiple regression analyses, caregiving difficulty and total mood disturbance were regressed on two- and three-way interaction terms for demand, mutuality, and preparedness, controlling for caregiver age and gender, and the simple effect of each independent variable. Results: Negligible effects for two-way interactions were found. However, the three-way interaction between demand, mutuality, and preparedness explained statistically significant variance in both perceived difficulty of caregiving and total mood disturbance. High mutuality in combination with high preparedness protected caregivers from adverse outcomes when demand was high. When either mutuality or preparedness was low, caregivers were at greater risk for negative outcomes when demand was high, but not when demand was low. When both mutuality and preparedness were low, caregivers were at risk for mood disturbance even when demand was low. Discussion: Analysis of three-way interactions provided new theoretical insights into the protective effects of mutuality and preparedness and demonstrated conditions under which caregivers are at increased risk for negative outcomes.

Families and hospitalized elders: A typology of family care actions.

The extensive care provided by families to their elderly relatives in the home is well documented. Although family caregiving is likely to be continued during hospitalization of elderly relatives, limited research has been conducted to address the nature of family care for hospitalized elders. The main purpose of this qualitative study was to refine the content domain of family care for hospitalized elders. Altogether 25 interviews were done. Of the 16 participants, 6 were family members, 6 were patients, and 4 were nurses; 7 participants were interviewed once and 9 participants were interviewed twice. Qualitative analysis based on Lofland and Loflands (1984, 1995) approach resulted in the identification of three major content domains: family members providing care to the patient, working together with the health care team, and taking care of themselves. This typology suggests a shift of research in this area from its current focus on family needs to a view of family caregivers as partners with the health care team.

pH and Concentrations of Pepsin and Trypsin in Feeding Tube Aspirates as Predictors of Tube Placement

BACKGROUND The purpose of this study was to determine the extent to which pepsin and trypsin concentrations in feeding tube aspirates, in addition to pH, contribute to predicting feeding tube position. METHODS Aspirates from 742 feeding tubes (nasogastric, n = 343; nasointestinal, n = 399) were tested for pH and enzyme concentrations. Also tested were aspirates from two feeding tubes inadvertently positioned into the lung (one in the pleural space and one in the tracheobronchial tree) and 146 samples of tracheobronchial and pleural fluids collected by other methods. Enzyme assays were conducted in a research laboratory. Results of the pH and enzyme tests were compared with radiologic reports of tube location. RESULTS Gastric fluid had a mean low pH (4.06), a high mean pepsin concentration (349.1 micrograms/mL), and a low mean trypsin concentration (19.3 micrograms/mL). In contrast, intestinal fluid had a mean high pH (7.40), a high mean trypsin concentration (143.0 micrograms/mL), and a low mean pepsin concentration (24.2 micrograms/mL). Respiratory samples also had a high mean pH (7.89) but contained little or no pepsin or trypsin. Using a logistic regression equation with all three variables to differentiate between respiratory and gastrointestinal placement, it was possible to correctly classify 100% of the respiratory cases and 93.4% of the gastrointestinal cases. Another equation used to differentiate between gastric and intestinal sites was able to classify correctly 91.2% of the gastric cases and 91.5% of the intestinal cases. CONCLUSIONS The results clearly indicate that laboratory-determined enzyme concentrations in feeding tube aspirates are helpful in predicting tube location. Thus, it is desirable that inexpensive, simple bedside tests be developed so that they can be used in conjunction with pH measurements to help predict tube position.