Rate responsive pacing is given a Class IIa indication in those with documented chronotropic incompetence.

FORBES: Overview of the New HRS/ACCF Pacemaker Guidelines

In AV block , dual chamber pacemakers also get a class I indication.

FORBES: Overview of the New HRS/ACCF Pacemaker Guidelines

Single lead VDD pacing in those with intact sinus node function (i.e. a young patient with congenital AV block) gets a class IIa indication.

FORBES: Overview of the New HRS/ACCF Pacemaker Guidelines

Sinus node dysfunction (SND) gets a clear endorsement for dual chamber (DDD) pacing with a class I indication, even in those without manifest AV conduction abnormalities.

FORBES: Overview of the New HRS/ACCF Pacemaker Guidelines

And the thriving, burgeoning middle class is one indication of that.

CNN: Africa Achievements: Top 5 ways the continent shone in 2012

If the justices' recent rulings are any indication, StoneRidge will end up as another strike against class-action lawsuits.

FORBES: StoneRidge: Don't Look For A Landmark Ruling

If history is any indication, all new infrastructure quickly will become indispensable to the Chinese middle class.

FORBES: Three Moneymakers From China's Slowdown