Depending on how strong an arm you have, watching ABC’s “Off the Map” (10 p.m. EST Wednesdays) could require medical attention: It’s a head-smacker. You know, a show so preposterous that it inspires the watcher to smack his or her forehead with the palm of the hand. Executive produced by Shonda Rhimes (“Grey’s Anatomy,” “Private Practice”) and created by Jenna Bans (a “Grey’s” writer), “Off the Map” follows a trio of young doctors who arrive at a clinic “somewhere in South America” (played by Hawaii and locations that may look familiar to “Lost” fans).

These young docs proceed to behave like stereotypically idiotic, privileged Americans — and sappy characters on a TV melodrama.

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