Clipping the Ring

Leaflet-to-Annuloplasty Ring Clipping for Severe Mitral Regurgitation.

A n 86-year-old man presented with recurrent heart failure and severe mitral regurgitation in the setting of previous surgical mitral repair for degenerative valve disease. Surgery had consisted of placement of a 32-mm CarpentierEdwards Physio II annuloplasty ring (Edwards Lifesciences, Irvine, California). Transesophageal echocardiography demonstrated a large anterior leaflet (Figure 1A, arrow...

Clipping the Alfieri Stitch.

A 75-year-old woman underwent a surgical correction of severe mitral regurgitation (MR). The valve morphology was characterized by chordae rupture (P2), prolapse (A2), and an unusual small anterior valve area with a restrictive posterior leaflet. The correction comprised chordae replacement P2/A2 without annuloplasty due to a tight annulus. Finally, an Alfieri stitch was performed. Four weeks l...

Clipping along.

In this issue of JMB, Rajendar and Lucius report a study of themechanism of polypeptide translocation catalyzed by the Escherichia coli ClpA enzyme—the motor component of the ATP-dependent protease, ClpAP. ATP-dependent proteases play important roles in protein turnover and share a common architecture across organisms. ClpAP is composed of the hexameric AAA+ motor protein ClpA and the tetradeca...

Clipping Wings

Accelerating Polygon Clipping

Polygon clipping is a central part of image generation and image visualization systems. In spite of its algorithmic simplicity it consumes a considerable amount of hardware or software resources. Polygon clipping performance is dominated by two processes: intersection calculations and data transfers. The paper analyzes the prevalent Sutherland-Hodgman algorithm for polygon clipping and identifi...