Final answer:
Permanent pacemaker implantation is indicated for heart rhythm abnormalities like bradycardia or heart block when there's no reversible cause and conditions don't improve with medication.
Step-by-step explanation:
Common indications for permanent pacemaker implantation include the absence of a reversible cause for heart rhythm abnormalities, such as bradycardia (slow heart rate) or heart block (a delay or complete block of the heart's electrical impulse). The implantation of a pacemaker is considered when a patient's heart condition does not respond to medication or when the cause of the condition is unlikely to resolve on its own. Situations warranting the use of a pacemaker include symptomatic bradycardia, atrioventricular block, and sick sinus syndrome, among others.