Routine use of natriuretic peptides: Lessons from a big data analysis

BACKGROUND

Natriuretic peptides have broad indications during heart failure and the detection of left ventricular dysfunction in high-risk patients. They can also be used for the diagnosis/management of other cardiac diseases. However, very little is known regarding their use in routine practice.

METHODS

We examined all biological tests performed from February 2010 to August 2015 in two districts from the French Brittany, covering 13,653 km² and including 22,265 physicians. We report the settings and conditions of N-terminal pro-B-type natriuretic peptide (NT-proBNP) measurements (the only locally natriuretic peptide available).

RESULTS

From a total of 3,606,432 tests requested in 557,650 adult (older than 20 years) patients, only 56,653 (1.6%) included at least one NT-proBNP measurement. NT-proBNP measurements gradually increased, from 9188 in 2011 to 12,938 in 2014 (P < 0.001). Most NT-proBNP tests were measured in urban laboratories (72.7%) and in private (62.9%) non-hospital/clinics laboratories; they were mostly ordered by general practitioners (66% compared with 11% by cardiologists). The number of NT-proBNP measurements increased with age up to 80-90 years, and 70.3% of tests were measured in ≥75 years patients. Creatinine and electrolytes were not associated with NT-proBNP in 15.8% and 19.7% of tests, respectively.

CONCLUSION

Among a very large cohort, we observed that natriuretic peptides remain largely undermeasured. NT-proBNP is mostly measured in elderly patients, and its interpretation may be hazardous in up to 16% of all individuals because no measurement of creatinine was associated to NT-proBNP.

Multiple biomarkers measurement to estimate the duration of atrial fibrillation

BACKGROUND

An accurate estimation of the duration of atrial fibrillation is critical for its safe management. Recent studies suggested that copeptin, carbohydrate antigen-125, galectin-3 and growth differentiation factor-15 are increased in atrial fibrillation. We examined the ability of these markers to identify patients presenting with atrial fibrillation of ≤48 versus >48 h duration.

METHODS

Retrospective analysis of a prospective study that included patients with atrial fibrillation of known duration.

RESULTS

A total of 98 patients were analysed, 47 with atrial fibrillation ≤48 h and 51 with >48 h. In patients presenting with atrial fibrillation of ≤48 versus >48 h duration, the mean carbohydrate antigen-125 concentration was 16.9 ± 12.5 versus 30.9 ± 36.3 U/mL (P = 0.01), and growth differentiation factor-15 concentration was 1320 ± 889 versus 2608 ±2163 pg/mL (P < 0.001). Copeptin concentration was not independently associated with atrial fibrillation duration. The galectin-3 concentration did not differ between groups. Area under the ROC curve to identify patients with atrial fibrillation ≤48 h was 0.869 for carbohydrate antigen-125, 0.853 for growth differentiation factor-15.

CONCLUSION

The plasma concentrations of carbohydrate antigen-125, growth differentiation factor-15 and copeptin, but not galectin-3, are higher in patients presenting with atrial fibrillation of >48 h duration than in those with atrial fibrillation ≤48 h. The ability to discriminate recent atrial fibrillation offered by carbohydrate antigen-125 and growth differentiation factor-15 seems high.

How to better help cancer patients face their coming death?

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Background: According to literature and medical experience, the doctor-patient relationship becomes strained when oncologists tell their patients that they have no more curative treatments to offer them. Patients often resist when they are told that it is in their best interest to meet with the palliative teams. Little is known about how to meet patients’ expectations at this advanced stage. Methods: We conducted a multicenter qualitative research in an oncology department, a hospital at home service and in an inpatient hospice care center. We met 47 patients (M = 21, F = 27, mean age = 65 yrs, mean disease duration = 5 yrs) for in-depth face to face interviews performed by a multi-disciplinary ethics team. Interviews were carried out between 1 and 3 months before death. Results: Qualitative analysis revealed 4 main results. 1/ For respondents, palliative care introduction meant impending death. 2/ Palliative care introduction meant loss of hope. Without hope, the cancer trajectory is impossible to sustain, they said. 3/ Hope was intricately interwoven with the request for more chemotherapy, even if doctors had clearly refused to provide it. 4/ The oncologist remained the referent physician, even for patients in hospice care. Patients for which the mean duration between cancer diagnosis and interview was 5 years or more, were more willing to talk about death and better accepted palliative care than patients for which the mean duration of cancer was inferior to 3 yrs. For patients with fast progressing cancer (n = 11), 10 were not willing to talk about death and 7 strongly resisted palliative care introduction. There was no difference between patients according to age, sex, type of cancer or center of inclusion. Conclusions: In the terminal phase of cancer, patients are unwilling to talk about death and are reluctant to meet with palliative care teams. Short disease duration strongly reinforces this attitude. If patients resist discussions about their impending death, should physicians continue to consider it good practice to introduce such discussions? Is it beneficent for patients?