Aministration of 2mg of atropine (an antagonist of muscarinic receptors) intrave

Question

Aministration of 2mg of atropine (an antagonist of muscarinic receptors) intravenously did not result in any change in heart rate.

Is this response normal? how can you account for this result?

Then isoproterenol (a beta adrenergic agonist) administration resulted in her heart increasing from 60/min to 118/min. Stimulated release of carecholamines from sympathetic nerve endings (via administration of an MAOI) produce a rise in blood pressure.

Are there responses normal? what do they tell you?

Where in the system do you believe this patients problem lies? Why?

Explanation / Answer

* Atropine administration do not show any result in second degree heart block Mobitz type-2 or a third degree heart block with a low purkenje block in His-purkenje system or ventricular escape.

* The responses are pretty much normal.

* The patient might have a block in His-purkenje system or distal conduction system

* The response indicates inadequate chronotropic reserves

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