The cardiac pacemaker was invented by:

  • A
    Walton Lillehei
  • B
    $A. S. Hyman$
  • C
    Joseph Murray
  • D
    Christiaan Barnard

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The intra-aortic balloon pump $(IABP)$ is inflated by which of the following gases?

The role of a pacemaker is to:

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