L'amylose cardiaque à transthyrétine

Correlation of 99mTc-DPD bone scintigraphy with histological amyloid load in patients with ATTR cardiac amyloidosis

BACKGROUND

The significance of measuring 99mTc-labelled-3,3-diphosphono-1,2-propanodicarboxylic acid (99mTc-DPD) in transthyretin (ATTR) cardiac amyloidosis has not been adequately studied. This single-centre observational study evaluated the correlation between 99mTc-DPD scintigraphy and histological amyloid load in endomyocardial biopsy (EMB).

METHODS

Twenty-eight patients with biopsy-proven ATTR amyloidosis and concomitantly available 99mTc-DPD scintigraphy were included. Visual Perugini scoring, and (semi-)quantitative analysis of cardiac 99mTc-DPD uptake by planar whole-body imaging and single photon emission computed tomography (SPECT/CT) using regions of interest (ROI) were performed. From this, heart-to-whole-body ratio (H/WB) and heart-to-contralateral-chest ratio (H/CL) were calculated. The histological amyloid load was quantified using two different staining methods.

RESULTS

Increased cardiac tracer uptake was documented in all patients (planar: ROImean 129 ± 37 cps; SPECT/CT: ROImean 369 ± 142 cps). Histological amyloid load (19 ± 13%) significantly correlated with Perugini score (r = 0.69, p < .001) as well as with cardiac 99mTc-DPD uptake (planar: r = 0.64, p < .001; H/WB: r = 0.50, p = .014; SPECT/CT: r = 0.53, p = .008; H/CL: r = 0.43, p = .037) (results are shown for correlations with Congo Red-staining).

CONCLUSION

In ATTR, cardiac 99mTc-DPD uptake significantly correlated with histological amyloid load in EMB. Further studies are needed to implement thresholds in cardiac 99mTc-DPD uptake measurements for risk stratification and guidance of therapy.

Consensus of experts from the French Society of Geriatrics and Gerontology on the management of heart failure in very old subjects

The prevalence of heart failure increases with age. In France, the 1-year mortality rate is 35% in subjects aged 80-89 years with heart failure, and 50% after the age of 90 years. In octogenarians, heart failure is associated with high rates of cardiovascular and non-cardiovascular events, and is one of the main causes of hospitalization and disability. The prevalence of frailty increases in elderly subjects with heart failure, and the co-occurrence of heart failure and frailty increases the risk of mortality in patients with heart failure. In the elderly, the presence of frailty must be evaluated using a comprehensive geriatric assessment to manage geriatric syndromes, such as cognitive disorders, malnutrition, falls, depression, polypharmacy, disability and social isolation. The objective of heart failure therapy in octogenarians is to reduce symptoms, mortality and hospitalizations, but also to improve quality of life. In the absence of specific studies involving very old subjects, most recommendations are extrapolated from evidence-based data from younger populations. Overall, the epidemiological studies in patients with heart failure aged>80 years highlight the underprescription of recommended drugs. This underprescription may be related to comorbidity, a fear of side-effects and the lack of specific recommendations for drug prescription in heart failure with preserved ejection fraction, which is common in this very old population. The benefit/risk ratio related to heart failure treatment and comorbidity should be carefully weighed and reassessed on a regular basis. Consideration of disease prognosis according to factors that predict mortality can help to better define the care plan and promote palliative and supportive care when needed.