GC-MS analysis of 4-hydroxyproline: elevated proline hydroxylation in metformin-associated lactic acidosis and metformin-treated Becker muscular dystrophy patients.

Metformin (N,N-dimethylbiguanide), an inhibitor of gluconeogenesis and insulin sensitizer, is widely used for the treatment of type 2 diabetes. In some patients with renal insufficiency, metformin can accumulate and cause lactic acidosis, known as metformin-associated lactic acidosis (MALA, defined as lactate ≥ 5 mM, pH < 7.35, and metformin concentration > 38.7 µM). Here, we report on the post-translational modification (PTM) of proline (Pro) to 4-hydroxyproline (OH-Pro) in metformin-associated lactic acidosis and in metformin-treated patients with Becker muscular dystrophy (BMD). Pro and OH-Pro were measured simultaneously by gas chromatography-mass spectrometry before, during, and after renal replacement therapy in a patient admitted to the intensive care unit (ICU) because of MALA. At admission to the ICU, plasma metformin concentration was 175 µM, with a corresponding lactate concentration of 20 mM and a blood pH of 7.1. Throughout ICU admission, the Pro concentration was lower compared to healthy controls. Renal excretion of OH-Pro was initially high and decreased over time. Moreover, during the first 12 h of ICU admission, OH-Pro seems to be renally secreted while thereafter, it was reabsorbed. Our results suggest that MALA is associated with hyper-hydroxyprolinuria due to elevated PTM of Pro to OH-Pro by prolyl-hydroxylase and/or inhibition of OH-Pro metabolism in the kidneys. In BMD patients, metformin, at the therapeutic dose of 3 × 500 mg per day for 6 weeks, increased the urinary excretion of OH-Pro suggesting elevation of Pro hydroxylation to OH-Pro. Our study suggests that metformin induces specifically the expression/activity of prolyl-hydroxylase in metformin intoxication and BMD.

Roles and competencies of nurses and physicians in shared decision-making in cardiac surgery: A scoping review.

AIM: Identification and synthesis of research data related to the roles and competencies of physicians and nurses that are prerequisites for careful shared decision-making with patients potentially undergoing cardiac surgery. DESIGN: A scoping review was conducted in accordance with the Joanna Briggs Institute's methodology for scoping reviews and the PRISMA Extension for Scoping Reviews. METHODS: PubMed, EMBASE and CINAHL were searched from inception dates up to March 2022, to identify primary studies published in a peer-reviewed journal. Study selection, assessment of the methodological quality and data extracting of the included studies were done by at least two independent researchers. To describe the findings of the studies, an emergent synthesis approach was used to visualize a descriptive representation of professional roles and competencies in shared decision-making, in an overview. RESULTS: The systematic search revealed 10,055 potential papers, 8873 articles were screened on title and abstract and 76 full texts were retrieved. Eight articles were included for final evaluation. For nurses and physicians, 26 different skills were identified in the literature to practice shared decision-making in cardiac surgery. The skills that emerged were divided into five professional roles: moderator; health educator; data collector; psychological supporter and translator. CONCLUSIONS: This review specifies the professional roles and required competencies related to shared decision-making in cardiac surgery. Further research is needed to compare our findings with other clinical areas and from there to arrive at a professional division of roles between the different clinical disciplines involved. IMPACT: The visualization of generic shared decision-making competencies and roles should establish the professional division of positions between various clinical physician and nurse disciplines in order to create a treatment plan based on evidence, values, preferences and the patient's personal situation. PATIENT OR PUBLIC CONTRIBUTION: No patient or public contribution.

A qualitative study of the experiences and perceptions of older patients and relatives prior to cardiac surgery.

BACKGROUND: Shared decision-making plays an important role in ensuring value-based healthcare in cardiac surgery. However, the personal situations of patients in cardiac care have not been widely explored, and thus, little is known about the decision-making experiences of patients and their relatives before surgery. OBJECTIVE: To explore the perceptions of patients indicated for cardiac surgery and their relatives during the decision-making process, as well as their experiences of a conversation aimed at achieving shared decision-making in the treatment trajectory. METHODS: The data were collected through semi-structured in-depth interviews with patients aged ≥70 years who were indicated for cardiac surgery and their relatives until theme saturation. Both inductive and deductive analysis were conducted based on the principles of reflexive thematic analysis. RESULTS: Interviews with 16 patients and 10 relatives provided in-depth insights into the experiences of patients and their relatives in terms of a shared decision-making process prior to surgery. Overall, 15 subthemes were identified, and these were divided into three themes. In general, the patients' experiences and perceptions were influenced by their (1) general daily functioning. The relatives were more concerned about (2) social expectations and (3) existential uncertainty. CONCLUSIONS: Patients eligible for cardiac surgery and their families have unique experiences and perceptions during the process of shared decision-making. The subthemes emerging from this study, such as the overestimation of potential medical outcomes by patients and their relatives, who experience fear about the current health situation of their loved one, require careful attention from healthcare professionals during decision-making conversations.