Publications by authors named "Billman G"

Background: Medication errors are common during transitions of care, such as discharge from the emergency department (ED) or urgent care (UC). The Joint Commission has identified medication reconciliation as a key safety practice. Our aim was to increase the percentage of patients with completed medication reconciliation at discharge from our pediatric ED and 4 UCs from 25% to 75% in 12 months.

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Background: Noninvasive ventilation (NIV) masks are implicated in 59% of respiratory device-related pressure injuries in hospitalized children. Historically, the Braden Q scale was not adequate in identifying risk for pressure injury associated with devices and, therefore, was modified to the Braden QD scale. The purpose of this study was to evaluate whether the Braden QD scoring tool is better able to identify pediatric patients receiving NIV who are at risk for the development of pressure injury as compared to the previously used Braden Q scale.

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Article Synopsis
  • * Exercise improves heart function and structure, while the heart's responses to injury and stress are better understood but not fully characterized.
  • * The study analyzed the relationship between the speed of heart muscle contraction and relaxation after injury and exercise in dogs, finding a consistent linear correlation regardless of their training or injury status.
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  • Heart rate and heart rate variability (HRV) are influenced by the autonomic nervous system (ANS) and the sinoatrial node (SAN), but their individual contributions to HRV remain unclear, complicating treatment for heart issues.
  • A study analyzed HRV in dogs and humans, revealing that the SAN primarily affects long-term HRV while the ANS impacts short-term HRV; similar trends were observed in human patients with heart conditions.
  • The findings suggest that both SAN and ANS deterioration is linked to heart disease and aging, and that SAN characteristics can be non-invasively assessed from heart beat intervals, potentially improving diagnostic methods.
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The grand challenge to physiology, as was first described in an essay published in the inaugural issue of Frontiers in Physiology in 2010, remains to integrate function from molecules to intact organisms. In order to make sense of the vast volume of information derived from, and increasingly dependent upon, reductionist approaches, a greater emphasis must be placed on the traditional integrated and more holistic approaches developed by the scientists who gave birth to physiology as an intellectual discipline. Our understanding of physiological regulation has evolved over time from the Greek idea of body humors, through Claude Bernard's "milieu intérieur," to Walter Cannon's formulation of the concept of "homeostasis" and the application of control theory (feedback and feedforward regulation) to explain how a constant internal environment is achieved.

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Background: Despite years of attention, hospitals continue to struggle to implement successful medication reconciliation. This study aimed to increase the percentage of hospital admission medication reconciliation (AdmMedRec) completion to ≥ 95% in 12 months at a large academic children's hospital.

Methods: A quality improvement (QI) project was initiated in April 2017 by an interdisciplinary team of physicians, nurses, pharmacists, and analysts, co-led by a pediatric hospitalist and chief medical information officer.

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Siloed or singular system approach to disease management is common practice, developing out of traditional medical school education. Textbooks of medicine describe a huge number of discrete diseases, usually in a systematic fashion following headings like etiology, pathology, investigations, differential diagnoses, and management. This approach suggests that the body has a multitude of ways to respond to harmful incidences.

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Power spectral density (PSD) analysis of the heartbeat intervals in the three main frequency bands [very low frequency (VLF), low frequency (LF), and high frequency (HF)] provides a quantitative non-invasive tool for assessing the function of the cardiovascular control system. In humans, these frequency bands were standardized following years of empirical evidence. However, no quantitative approach has justified the frequency cutoffs of these bands and how they might be adapted to other mammals.

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Article Synopsis
  • Long-term aerobic exercise may worsen heart issues in patients with catecholaminergic polymorphic ventricular tachycardia (CPVT) due to changes in heart rate and autonomic balance, which might not support healthy heart function.
  • This study aimed to explore how long-term exercise affects the likelihood of arrhythmias in a mouse model of CPVT by examining heart rate, arrhythmia occurrence, and calcium behavior in heart cells.
  • The findings revealed that while exercise improved overall performance in CPVT mice, it also increased the frequency and severity of dangerous heart rhythms, indicating that exercise adaptations may heighten the risks of arrhythmias in these individuals.*
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Introduction: Over the last 40 years omega-3 polyunsaturated fatty acids (PUFAs) have been shown to be anti-arrhythmic or pro-arrhythmic depending on the method and duration of administration and model studied. We previously reported that omega-3 PUFAs do not confer anti-arrhythmic properties and are pro-arrhythmic in canine model of sudden cardiac death (SCD). Here, we evaluated the effects of chronic omega-3 PUFA treatment in post-MI animals susceptible (VF+) or resistant (VF-) to ventricular tachyarrhythmias.

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Neuronal elements distributed throughout the cardiac nervous system, from the level of the insular cortex to the intrinsic cardiac nervous system, are in constant communication with one another to ensure that cardiac output matches the dynamic process of regional blood flow demand. Neural elements in their various 'levels' become differentially recruited in the transduction of sensory inputs arising from the heart, major vessels, other visceral organs and somatic structures to optimize neuronal coordination of regional cardiac function. This White Paper will review the relevant aspects of the structural and functional organization for autonomic control of the heart in normal conditions, how these systems remodel/adapt during cardiac disease, and finally how such knowledge can be leveraged in the evolving realm of autonomic regulation therapy for cardiac therapeutics.

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It is well known that moderate exercise training elicits a small increase in ventricular mass (i.e., a physiological hypertrophy) that has many beneficial effects on overall cardiac health.

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The mechanisms responsible for exercise-induced reductions in baseline heart rate (HR), known as training bradycardia, remain controversial. Therefore, changes in cardiac autonomic regulation and intrinsic sinoatrial nodal (SAN) rate were evaluated using dogs randomly assigned to either a 10- to 12-wk exercise training (Ex, n = 15) or an equivalent sedentary period (Sed, n = 10). Intrinsic HR was revealed by combined autonomic nervous system (ANS) blockade (propranolol + atropine, iv) before and after completion of the study.

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Introduction: Autonomic neural activation during cardiac stress testing is an established risk-stratification tool in post-myocardial infarction (MI) patients. However, autonomic activation can also modulate myocardial electrotonic coupling, a known factor to contribute to the genesis of arrhythmias. The present study tested the hypothesis that exercise-induced autonomic neural activation modulates electrotonic coupling (as measured by myocardial electrical impedance, MEI) in post-MI animals shown to be susceptible or resistant to ventricular fibrillation (VF).

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Background: Although sinoatrial node (SAN) dysfunction is a hallmark of human heart failure (HF), the underlying mechanisms remain poorly understood. We aimed to examine the role of adenosine in SAN dysfunction and tachy-brady arrhythmias in chronic HF.

Methods And Results: We applied multiple approaches to characterize SAN structure, SAN function, and adenosine A1 receptor expression in control (n=17) and 4-month tachypacing-induced chronic HF (n=18) dogs.

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Rationale: Cardiac function is dependent on the coordinate activities of membrane ion channels, transporters, pumps, and hormone receptors to tune the membrane electrochemical gradient dynamically in response to acute and chronic stress. Although our knowledge of membrane proteins has rapidly advanced during the past decade, our understanding of the subcellular pathways governing the trafficking and localization of integral membrane proteins is limited and essentially unstudied in vivo. In the heart, to our knowledge, there are no in vivo mechanistic studies that directly link endosome-based machinery with cardiac physiology.

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It has been proposed that dietary omega-3 polyunsaturated fatty acids (n-3 PUFAs) can reduce the risk of ventricular arrhythmias in post-MI patients. Abnormal Ca(2+) handling has been implicated in the genesis of post-MI ventricular arrhythmias. Therefore, we tested the hypothesis that dietary n-3 PUFAs alter the vulnerability of ventricular myocytes to cellular arrhythmia by stabilizing intracellular Ca(2+) cycling.

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