1. Definition of adherence. In terms of TB control, adherence to treatment may be defined as the extent to which the patient's history of therapeutic drug-taking coincides with the prescribed treatment (7) . Adherence may be measured using either process-oriented or outcome-oriented definitions.
In general, peripheral catheters are preferred when IV access is required for shorter periods, when direct access to the central circulation is unnecessary, and when smaller gauge catheters suffice. Peripheral access is generally safer, easier to obtain, and less painful than central access.
Types of Peripheral Devices. Peripheral devices can be external or internal. 1  Examples of external peripherals include mouse, keyboard, printer, monitor, external Zip drive or scanner.  Examples of internal peripherals include CD-ROM drive, CD-R drive or internal modem.