Rotor mechanism and its mapping in atrial fibrillation.

Treatment of atrial fibrillation (AF) remains challenging despite significant progress in understanding its underlying mechanisms. The first detailed, quantitative theory of functional re-entry, the 'leading circle' model, was developed more than 40 years ago. Subsequently, in decades of study, an alternative paradigm based on spiral waves has long been postulated to drive AF.

[Diagnostic value of ultrasound elastography in prostate cancer].

Ultrasound elastography, as a new imaging technique to obtain information about tissue elasticity, can directly or indirectly reflect the differences of the inner elastic modulus and other mechanical properties in the tissue, and thus clearly display and position pathological changes and identify lesions. With its rapid development and wide application to clinical practice, ultrasound elastography has become a hot research topic. However, reports are rarely seen at home and abroad about the application of ultrasound elastography in the diagnosis of prostate cancer.