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Calcimator

Pacemaker Programming Calculator

Calculate pacemaker timing intervals, battery drain, TARP, tracking limits, and safety margins from programmed settings.

Inputs

bpm
bpm
ms
ms
V
Ω

Results

Pacing Interval

1,000 ms

Total Atrial Refractory Period

430 ms

Max Tracking Rate140 bpm
2:1 Block Rate140 bpm
Average Current Drain2 µA
Energy per Pulse5 µJ
Voltage Safety Margin3.33:1
Safety Margin Status2
Est. Battery Life68.5 years
How to Use This Calculator
  1. Enter lower rate limit (bpm), upper rate limit (bpm), AV delay (ms), pulse width (ms), and output voltage (V).
  2. Set lead impedance (Ω).
  3. Review Pacing Interval (ms), Total Atrial Refractory Period (TARP), Max Tracking Rate, and 2:1 Block Rate.
  4. Check Energy per Pulse (µJ) and Average Current Drain (µA) to estimate device longevity.

How the result changes with Lower rate limit

Lower rate limitPacing IntervalTotal Atrial Refractory Period
391,538 ms430 ms
62968 ms430 ms
89674 ms430 ms
111541 ms430 ms

What each input means

Lower rate limit
Minimum pacing rate (LRL). Typically 60 bpm.
Upper rate limit
Maximum tracking/sensor rate (URL). Typically 110-130 bpm.
AV delay
Programmed AV interval. Typically 120-200 ms.
Pulse width
Output pulse duration. Typically 0.4 ms.
Output voltage
Pacing output amplitude. Typically 2.5-3.5 V.
Lead impedance
Lead impedance. Normal 300-1000 Ω. Low suggests insulation breach; high suggests fracture.

What each result means

Pacing Interval
Interval between paced beats at lower rate = 60000/LRL.
Total Atrial Refractory Period
TARP = AV delay + PVARP (250 ms). Determines tracking behavior.
Max Tracking Rate
Maximum rate the ventricle can track atrial activity = 60000/TARP.
2:1 Block Rate
Atrial rate above which 2:1 AV block occurs.
Average Current Drain
Estimated average pacing current consumption.
Energy per Pulse
Energy delivered per pacing pulse.
Voltage Safety Margin
Output voltage / threshold. Aim for 2:1 or greater.
Safety Margin Status
0 = Inadequate, 1 = Marginal, 2 = Adequate, 3 = Excessive.
Est. Battery Life
Rough battery longevity estimate (assumes 100% pacing, 1.2 Ah battery).

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Lower rate limit = 60, Upper rate limit = 130, AV delay = 180, Pulse width = 0.4 = 6 input(s) provided
  2. Calculate Pacing Interval
    Pacing Interval
    1000 = 1000
  3. Calculate Total Atrial Refractory Period
    Total Atrial Refractory Period
    430 = 430
  4. Calculate Max Tracking Rate
    Max Tracking Rate
    140 = 140
  5. Calculate 2:1 Block Rate
    2:1 Block Rate
    140 = 140

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