Pacemaker, implantable
A pacemaker in which the electrodes to the heart, the electronic circuitry, and the power supply are all implanted internally within the body.
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- Pacemaker, internal
The internal pacemaker was invented by Wilson Greatbatch in 1958. While building an oscillator to record heart sounds, he installed a resistor with the wrong resistance in the unit. It began to give off a steady electrical pulse. Greatbatch realized that the device could be used to regulate the heart and hand-crafted the world’s first […]
- Pacemaker, natural
The natural pacemaker of the heart is the sinus node, one of the major elements in the cardiac conduction system, the system that controls the heart rate. This stunningly designed system generates electrical impulses and conducts them throughout the muscle of the heart, stimulating the heart to contract and pump blood. The sinus node consists […]
- Pachy- (prefix)
Thick. As in pachydactyly (thick fingers), pachydermatous (thick fingers) and pachyonychia (thick nails). From the Greek pachys, thick.
- Pachyderma
McGraw-Hill Professional, 2008.
- Pachydermatous
1. Thick-skinned like a pachyderm (an elephant, rhinoceros, or hippopotamus). 2. By extension, insensitive.