There are 5 letter codes for artificial pacemaker.According to those codes,these pacemakers are programmed to work and act on heart.These codes are given below in Table

1st Letter - Location of pacemaker	2nd Letter - Location of Sensitive Electrode	3rd Letter - Function of Pacemaker	4th Letter - Program mode of Pacemaker	5th Letter - Anti tachycardia Function
A = Atrium	A = Atrium	T = Trigger	P = Simple Programmable	P = Pacing(Anti tachy cardiac function)
V = Ventricle	V = Ventricle	I = Inhibit	M = Multi Programmable	S = Shock(Defibrillation function)
D = Dual (A+V)	D = Dual (A+V)	D = Dual (T+I)	R = Rate Modulated	D = Dual (P+S)
O = None	O = None	O = None	C = Communicable	O = None
----	----	----	O = None	----

For Example:
VAIMP refers to

Pacemaker located in Ventricle with sensitive electrode in Atrium of Inhibition function and it is Multi programmable and Pacing function


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Dr.A.Rufus Rajadurai MD.,D.DENS.,