Background Cardiac implantable electric devices are commonly used to treat heart failure. Little is known about temporal and geographic variation in use of cardiac resynchronization therapy (CRT) devices in usual care settings.
A hammer drill, also known as a rotary hammer, roto-drill or hammering drill, (see also rotary drill) is a rotary drill with a hammering action. The hammering action provides a short, rapid hammer thrust to pulverize relatively brittle material and provide quicker drilling with less effort.
The Broken Column. The Broken Column (La Columna Rota in Spanish) is an oil on masonite painting by Mexican artist Frida Kahlo, painted in 1944 shortly after she had had spinal surgery to correct on-going problems which had resulted from a serious traffic accident when the painter was eighteen years old.