block
| In computing, a group of records treated as a complete unit for transfer to or from backing storage. For example, many disk drives transfer data in 512-byte blocks. |
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Clonidine--may cause fatigue, bradycardia and/or heart block. You may have developed a medical condition called a heart block, which is a type of arrhythmia. A common effect is a decrease in conduction velocity through the atrioventricular node, which can result in heart block. |
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