Elevated Diaphragmatic Tonic Activity in PICU Patients: Age-Specific Definitions, Prevalence, and Associations.

OBJECTIVES: Tonic diaphragmatic activity (tonic Edi, i.e., sustained diaphragm activation throughout expiration) reflects diaphragmatic effort to defend end-expiratory lung volumes. Detection of such elevated tonic Edi may be useful in identifying patients who need increased positive end-expiratory pressure. We aimed to: 1) identify age-specific definitions for elevated tonic Edi in ventilated PICU patients and 2) describe the prevalence and factors associated with sustained episodes of high tonic Edi. DESIGN: Retrospective study using a high-resolution database. SETTING: Single-center tertiary PICU. PATIENTS: Four hundred thirty-one children admitted between 2015 and 2020 with continuous Edi monitoring. INTERVENTIONS: None. MEASUREMENTS AND MAIN RESULTS: We characterized our definition of tonic Edi using data from the recovery phase of respiratory illness (i.e., final 3 hr of Edi monitoring, excluding patients with significant persistent disease or with diaphragm pathology). High tonic Edi was defined as population data exceeding the 97.5th percentile, which for infants younger than 1 year was greater than 3.2 µV and for older children as greater than 1.9 µV. These thresholds were then used to identify patients with episodes of sustained elevated tonic Edi in the first 48 hours of ventilation (acute phase). Overall, 62 of 200 (31%) of intubated patients and 138 of 222 (62%) of patients on noninvasive ventilation (NIV) had at least one episode of high tonic Edi. These episodes were independently associated with the diagnosis of bronchiolitis (intubated patients: adjusted odds [aOR], 2.79 [95% CI, 1.12-7.11]); NIV patients: aOR, 2.71 [1.24-6.0]). There was also an association with tachypnea and, in NIV patients, more severe hypoxemia. CONCLUSIONS: Our proposed definition of elevated tonic Edi quantifies abnormal diaphragmatic activity during expiration. Such a definition may help clinicians to identify those patients using abnormal effort to defend end-expiratory lung volume. In our experience, high tonic Edi episodes are frequent, especially during NIV and in patients with bronchiolitis.

Patients' perspective of barriers and facilitators to taking long-term controller medication for asthma: a novel taxonomy.

BACKGROUND: Although asthma morbidity can be prevented through long-term controller medication, most patients with persistent asthma do not take their daily inhaled corticosteroid. The objective of this study was to gather patients' insights into barriers and facilitators to taking long-term daily inhaled corticosteroids as basis for future knowledge translation interventions. METHODS: We conducted a collective qualitative case study. We interviewed 24 adults, adolescents, or parents of children, with asthma who had received a prescription of long-term inhaled corticosteroids in the previous year. The one-hour face-to-face interviews revolved around patients' perceptions of asthma, use of asthma medications, current self-management, prior changes in self-management, as well as patient-physician relationship. We sought barriers and facilitators to optimal asthma management. Interviews were transcribed verbatim and transcripts were analyzed using a thematic approach. RESULTS: Patients were aged 2-76 years old and 58% were female. Nine patients were followed by an asthma specialist (pulmonologist or allergist), 13 patients by family doctors or pediatricians, and two patients had no regular follow-up. Barriers and facilitators to long-term daily inhaled corticosteroids were classified into the following loci of responsibility and its corresponding domains: (1) patient (cognition; motivation, attitudes and preferences; practical implementation; and parental support); (2) patient-physician interaction (communication and patient-physician relationship); and (3) health care system (resources and services). Patients recognized that several barriers and facilitators fell within their own responsibility. They also underlined the crucial impact (positive or negative) on their adherence of the quality of patient-physician interaction and health care system accessibility. CONCLUSIONS: We identified a close relationship between reported barriers and facilitators to adherence to long-term daily controller medication for asthma within three loci of responsibility. As such, patients' adherence must be approached as a multi-level phenomenon; moreover, interventions targeting the patient, the patient-physician interaction, and the health care system are recommended. The present study offers a potential taxonomy of barriers and facilitators to adherence to long-term daily inhaled corticosteroids therapy that, once validated, may be used for planning a knowledge translation intervention and may be applicable to other chronic conditions.

Facilitators and solutions for practicing optimal guided asthma self-management: the physician perspective.

OBJECTIVE: To identify key solutions that facilitate the prescription of long-term asthma controller and provision of written self-management plans by physicians. METHODS: One hour individualized semistructured interviews were conducted with physicians. Interviews were transcribed verbatim and analyzed independently by two trained qualitative researchers. A taxonomy of facilitators (contemplated solutions) and experienced solutions was achieved by consensus within the research team. RESULTS: Forty-two physicians (family physicians, pediatricians, emergency physicians, pulmonologists and allergists) were interviewed. The 867 facilitators and solutions, grouped in 10 categories, addressed three physician needs: support physicians in delivering optimal care (guideline dissemination, workplace culture, physician training and experience, physician attitudes toward optimal practice, tools and resources supporting physicians' decision making); assist patients with following recommendations (patient characteristics, experiences and attitudes; physician behaviour; and tools and resources supporting patient self-management); and offer efficient services (reorganization of care; interprofessional patient management). Suggestions pertaining to the latter two categories were most frequently cited to optimize asthma management and use of self-management plans (e.g., access to self-management plans; education by allied health care professionals). The most cited suggestions to support prescribing long-term controller pertained to physician behaviour (e.g., involvement in patient education, personalization of prescriptions, feedback to patients of the benefits of long-term controller). The distribution of facilitators and solutions varied across specialties. CONCLUSIONS: Physicians proposed multiple facilitators and solutions to support optimal practice, leading to the development of a novel taxonomy. Key suggestions varied across physician specialties and behaviours sought, emphasizing the need to carefully select the most promising knowledge translation interventions.