Article Figures & Data
Figures
- FIGURE 1.
(A) Positive [99mTc]Tc-pyrophosphate scan showing Perugini grade 3 uptake with heart–to–contralateral-lung ratio of 2.13 on planar imaging. (B) Diffuse tracer uptake on SPECT images. Contemporary diagnostic standard for [99mTc]Tc-pyrophosphate is SPECT imaging. Planar imaging performed alone leads to high percentage of false-positive studies.
- FIGURE 2.
Two-dimensional echocardiography: (A) Parasternal long axis view with left ventricular hypertrophy (white arrows). (B and C) Apical sparing longitudinal strain abnormality.
- FIGURE 3.
Four-chamber view of cardiac MRI showing diffuse subendocardial late gadolinium enhancement. Arrows point to late gadolinium enhancement on left ventricular and right ventricular sides of interventricular septum, resulting in train-track appearance.
Tables
Category Red flag Clinical Heart failure and intolerance to β-blockers and angiotensin-converting enzyme inhibitors Heart failure and peripheral or autonomic neuropathy Left ventricular hypertrophy with persistently elevated troponin levels History of bilateral carpal tunnel release Periorbital purpura Heart failure with nephrotic syndrome Macroglossia Spontaneous tendon rupture, especially biceps tendon rupture (Popeye sign) Lumbar spinal stenosis Plasma cell dyscrasia: elevated free light chains or abnormal serum or urine immunofixation Echocardiographic Unexplained left ventricular hypertrophy with… Biatrial enlargement Pericardial effusion Reduced global longitudinal strain, characteristically apical-sparing pattern Low-flow, low-gradient aortic stenosis Electrocardiographic Low-voltage QRS complex in setting of left ventricular hypertrophy
