Pacemaker Code (NBG)

Name: Pacemaker Code (NBG) calculator — MedScore
Creator: Nabil Alzein

What a pacemaker mode like DDD, VVIR or AAI means — revised NASPE/BPEG generic code (2002)

Examples from the code’s paper

VOO

VVIRV

AAI

AAT

AATOA

DDD

DDI

DDDR

DDDRA

DDDOV

DDDRD

I — chamber(s) paced

O — none

A — atrium

V — ventricle

D — dual (atrium + ventricle)

S — single chamber, atrium or ventricle (manufacturers’ designation)

II — chamber(s) sensed

O — none (no sensing)

A — atrium

V — ventricle

D — dual (atrium + ventricle)

S — single chamber, atrium or ventricle (manufacturers’ designation)

III — response to sensing

O — none

T — triggered: a sensed event triggers a pacing output

I — inhibited: a sensed event inhibits the pacing output

D — dual (triggered + inhibited)

IV — rate modulation

O — no rate modulation

R — rate modulation (adaptive-rate pacing)

V — multisite pacing

O — no multisite pacing

A — multisite atrial pacing (biatrial or more than one atrial site)

V — multisite ventricular pacing (biventricular or more than one ventricular site)

D — multisite pacing in atrium and ventricle

About this score

When to use

Decodes the NASPE/BPEG pacemaker code: chamber(s) paced, chamber(s) sensed, response to sensing, rate modulation and multisite pacing. ⁦[1]⁩

Pearls and pitfalls

The first three positions are always given; position IV appears when rate modulation is present, and all five when multisite pacing is present. ⁦[1]⁩

Summarised from the numbered sources under Evidence. Check the source before relying on a statement.

Evidence

[1] Original publication

Bernstein AD, Daubert JC, Fletcher RD, et al. The revised NASPE/BPEG generic code for antibradycardia, adaptive-rate, and multisite pacing. Five positions — chamber(s) paced, chamber(s) sensed, response to sensing, rate modulation, multisite pacing; the first three are always given, position IV when rate modulation is present, and all five when multisite pacing is present. Table II gives the worked examples shown here.

Pacing and Clinical Electrophysiology, 2002

Open source

Last reviewed: 2026-10

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MedScore is an educational and clinical decision-support tool. It does not provide a diagnosis, a treatment, or a drug-dosing recommendation, and it does not replace clinical judgement or local guidelines. Confirm every result against the original source before acting on it. The treating clinician remains responsible for all decisions.