| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Epicardial pacemaker electrode | Is a | True | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier |  | 
| Endocardial pacemaker electrode | Is a | True | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier |  | 
| Transvenous electrode, device | Is a | True | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier |  | 
| Removal of cardiac pacing electrode | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Reimplantation of cardiac pacemaker electrode | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Removal of epicardial electrodes | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier |  | 
| Removal of epicardial electrodes with replacement of epicardial lead | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 2 | 
| Resiting of lead of intravenous pacemaker system | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 2 | 
| Removal of IV endocardial electrode | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 3 | 
| Resiting of lead of cardiac pacemaker system NEC | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Insertion of epicardial electrode for temporary cardiac pacing | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 3 | 
| Insertion of permanent epicardial cardiac pacemaker system | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 2 | 
| Insertion of temporary cardiac pacemaker | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of electrode into cardiac atrium, replacement | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 2 | 
| Implantation of cardiac single-chamber device replacement, rate-responsive | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 3 | 
| Removal of cardiac pacemaker from epicardium with replacement of atrial and/or ventricular leads | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 2 | 
| Relocation of cardiac pacemaker pocket to new site in subcutaneous tissue | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 4 | 
| Implantation of rate-responsive cardiac single-chamber device | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Insertion of intracardiac pacemaker | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Removal of transvenous electrodes | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Insertion of permanent atrial pacemaker with transvenous electrodes | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Insertion of permanent pacemaker with transvenous electrodes, atrio-ventricular sequential | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Removal of cardiac pacemaker and replacement with single-chamber cardiac device | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Temporary insertion of pacemaker into atrium by transvenous route | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of electrode into cardiac ventricle, replacement | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Removal of cardiac pacemaker electrodes with replacement | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Initial implantation of cardiac single-chamber device | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 2 | 
| Insertion of permanent pacemaker with transvenous electrodes, ventricular | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Revision of pacemaker electrode leads | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 5 | 
| Implantation of electrode into cardiac atrium and ventricle, replacement | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 3 | 
| Implantation of electrode into cardiac atrium and ventricle, replacement | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 2 | 
| Initial implantation of cardiac dual-chamber device | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 2 | 
| Initial implantation of cardiac dual-chamber device | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 2 | 
| Initial implantation of cardiac dual-chamber device | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 3 | 
| Implantation of cardiac dual-chamber device, replacement | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Subcutaneous implantation of cardiac pacemaker | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 3 | 
| Insertion of permanent transvenous electrodes | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Removal of pacemaker electrode leads without replacement | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Replacement of cardiac pacemaker with single chamber pacemaker not specified as rate responsive | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Creation of cardiac pacemaker pocket new site in subcutaneous tissue | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 4 | 
| Repair of pacemaker electrodes | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Introduction of cardiac pacemaker system via vein | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of permanent intravenous cardiac pacemaker | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of intravenous fixed-rate cardiac pacemaker | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of intravenous triggered cardiac pacemaker | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of intravenous atrial overdrive pacemaker | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of intravenous pacemaker for atrial fibrillation | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Insertion of intravenous endocardial electrode | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of cardiac pacemaker | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of simple one wire intravenous cardiac pacemaker | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of complex one wire intravenous cardiac pacemaker | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of complex two wire intravenous cardiac pacemaker | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of intravenous dual chamber permanent cardiac pacemaker | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Other specified cardiac pacemaker system introduced via vein | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 2 | 
| Cardiac pacemaker system introduced via vein NOS | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of cardiac pacemaker system NEC | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Replacement of cardiac pacemaker device with dual-chamber device | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Removal of cardiac pacemaker with replacement by single-chamber device, rate-responsive | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Insertion of permanent epicardial cardiac pacemaker system | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 2 | 
| Insertion of permanent epicardial cardiac pacemaker system | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of electrode into cardiac atrium, replacement | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of electrode into cardiac atrium, replacement | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 2 | 
| Implantation of cardiac single-chamber device replacement, rate-responsive | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of cardiac single-chamber device replacement, rate-responsive | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 3 | 
| Implantation of rate-responsive cardiac single-chamber device | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of rate-responsive cardiac single-chamber device | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 3 | 
| Initial implantation of cardiac single-chamber device | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Initial implantation of cardiac single-chamber device | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 3 | 
| Implantation of electrode into cardiac atrium and ventricle, replacement | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of electrode into cardiac atrium and ventricle, replacement | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 2 | 
| Insertion of permanent epicardial cardiac pacemaker system | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 2 | 
| Insertion of permanent epicardial cardiac pacemaker system | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of electrode into cardiac atrium, replacement | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 3 | 
| Implantation of electrode into cardiac atrium, replacement | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of cardiac single-chamber device replacement, rate-responsive | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 4 | 
| Implantation of cardiac single-chamber device replacement, rate-responsive | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 2 | 
| Implantation of rate-responsive cardiac single-chamber device | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of rate-responsive cardiac single-chamber device | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 3 | 
| Initial implantation of cardiac single-chamber device | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 2 | 
| Initial implantation of cardiac single-chamber device | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of electrode into cardiac atrium and ventricle, replacement | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 3 | 
| Implantation of electrode into cardiac atrium and ventricle, replacement | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 4 | 
| Insertion of permanent epicardial cardiac pacemaker system | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 2 | 
| Insertion of permanent epicardial cardiac pacemaker system | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of electrode into cardiac atrium, replacement | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 3 | 
| Implantation of electrode into cardiac atrium, replacement | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of cardiac single-chamber device replacement, rate-responsive | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of cardiac single-chamber device replacement, rate-responsive | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 2 | 
| Implantation of rate-responsive cardiac single-chamber device | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 2 | 
| Implantation of rate-responsive cardiac single-chamber device | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Initial implantation of cardiac single-chamber device | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Initial implantation of cardiac single-chamber device | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 3 | 
| Implantation of electrode into cardiac atrium and ventricle, replacement | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 3 | 
| Implantation of electrode into cardiac atrium and ventricle, replacement | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 4 | 
| Insertion of permanent epicardial cardiac pacemaker system | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Insertion of permanent epicardial cardiac pacemaker system | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of electrode into cardiac atrium, replacement | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of electrode into cardiac atrium, replacement | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of cardiac single-chamber device replacement, rate-responsive | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 | 
| Implantation of cardiac single-chamber device replacement, rate-responsive | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 2 | 
| Implantation of rate-responsive cardiac single-chamber device | Direct device | False | Cardiac pacemaker electrode | Inferred relationship | Existential restriction modifier | 1 |