Pacing and Sensing Parameters
| Parameter Name | Range | Delivery Settings Per Model | Vitatron T20 SR T20A1 |
| Mode | VVIR, VVI, VVT, VOO, AAIR, AAI, AAT, AOO, OOO |
VVI |
| Lower rate | 40-(5)-130 min-1 | 60 min-1 |
| Maximum pacing rate | 90-(5)-170 min-1 | 120 min-1 |
| Pulse amplitudea | 0.5-(0.25)-4.0-(0.5)-8.0 V | 3.75 V |
| Pulse duration | 0.1-(0.05)-1.0 ms | 0.4 ms |
| Atrial sensitivity | Uni: 0.5-(0.1)-1.0-(0.5)-7.5 mV Bi: 0.25, 0.3-(0.1)-1.0-(0.5)-7.5 mV |
0.7 mV |
| Ventricular sensitivity | 1.0-(0.5)-10.0 mV | 2.0 mV |
| Sensing/pacing polaritya | Unipolar, Bipolar | Unipolar |
| Refractory period | 250-(10)-500 ms | 330 ms |
| Conditional hysteresisa | 0-(5)-30 min-1 | 0 min-1 |
a Conditional hysteresis is only applicable in VVI, VVT, AAI and AAT modes.
Other Programmable Parameters
| Parameter Name | Range | Delivery Settings Per Model | Vitatron T20 SR T20A1 |
| Flywheel | On, Off | Off |
| Night lower rate | 40-(5)-130 min-1 | 60 min-1 |
| Start of night | 18:00-(5 min)-02:55 hh:mm | 00:00 |
| End of night | 04:00-(5 min)-11:55 hh:mm | 06:00 |
| Pacemaker time | 00:00-(1 min)-23:59 hh:mm | 00:00 |
| Sensor slope | Auto, Fixed | Auto |
| Activity threshold | Low, Low/Med, Medium, Med/High, High | Medium |
| Activity acceleration | Fast, Standard, Gradual | Standard |
| Activity deceleration | Fast, Standard, Gradual | Standard |
| Ventricular Rate Stabilization | On, Off | Off |
| Maximum therapy rate | 70-(10)-120 min-1 | 100 min-1 |
| Selected Episodes trigger | Off, Atrial Rate (AAI(R) and AAT modes), Ventricular Rate (VVI(R) and VVT modes), Ventricular Variation (VVI(R) and VVT modes), Patient Assistant | Off |
| EGM recording | On, Off | Off |
Tolerances (valid between 22 °C and 45 °C throughout the pacemaker lifetime)
| Parameter | Tolerance |
| Lower rate (min-1) | Programmed value ±15 ms |
| Maximum pacing rate (min-1) | Programmed value ±15 ms |
| Pulse amplitude (V) | Programmed value ≤ 1.0: +40%/-10% Programmed value > 1.0 ≤ 4.0: +20%/-10% Programmed value > 4.0 ≤ 7.0: +10%/-10% Programmed value > 7.0: +10%/-20% |
| Pulse duration (ms) | Programmed value - 0.02/+0.04 |
| Atrial sensitivity (mV) | Programmed value ±(10% +0.16) at 37 °Ca |
| Ventricular sensitivity (mV) | Programmed value ±(20% +0.16) at 37 °Ca |
| Refractory period (ms) | Programmed value ±15 |
| Hysteresis (conditional) (min-1) | Programmed value ±15 |
| Lead impedance | Measured value ±(20% +20 Ω) |
| Battery voltage | Measured value ±0.03 V |
| EGM amplitude (atrial) | ±(10% +0.16 mV) +1% of full scale (at 37 °Ca) |
| EGM amplitude (ventricular) | ±(20% +0.16 mV) +1% of full scale (at 37 °Ca) |
| ECG marker timing | ±10 ms |
a Add ±10% over temperature range 22 °C to 45 °C.
Telemetered patient and pacemaker data (continued)
| Data item |
| Patient’s name and identification code |
| Patient’s date of birth |
| Pacemaker type, model number and serial number |
| Pacemaker implantation date |
| Lead manufacturer, model number and serial number |
| Lead implantation date |
| Pacemaker dependent (yes/no) |
| Symptoms |
| Indications for pacing |
| Etiology |
| Pacemaker time |
| Anticoagulation is applied (yes/no) |
| Anticoagulation start date |
| Notes |
| Physician’s name and phone number |
Measurements
| Measurement |
| Remaining pacemaker longevity |
| Remaining pacemaker longevity |
| Lead polarity |
| Lead impedance |
| Pulse amplitude |
| Battery status |
| Remaining battery capacity |
| Battery impedance |
| Battery voltage |
| Mean battery current |
| Consumed battery charge |
| Pulse energy |
| Average pulse current |
| P/R wave amplitude |
| Stimulation threshold |
| Fast learning |
Diagnostic Capabilities
| Category | Feature |
| ECG and therapy analysis | Intracardiac EGM ECG event marker intervals ECG marker annotation Therapy Advisor |
| Holters 24 | 24-hour Holter 30-minute Holter |
| Histograms/tables | Diurnal rhythm distribution P-wave amplitude (AAI and AAIR modes) Ventricular rate (VXX modes) Ventricular rate irregularity (VXX modes) Atrial rate (AAI, AAIR and AAT modes) |
| History | Diagnostics Tests Parameters |
| Counters | Percentage of atrium or ventricle paced Percentage of ventricle sensed (VXX modes) Percentage of physiologic atrial senses (AAI, AAIR and AAT modes) Percentage of pathologic atrial senses (AAI, AAIR and AAT modes) Number of PACs (AAI, AAIR and AAT modes) Number of accelerometer counts (AAIR and VVIR modes) |
| Selected Episodes | Atrial Rate (AAI, AAIR and AAT modes) Ventricular Rate (VVI, VVIR and VVT modes) Ventricular Variation (VVI, VVIR and VVT modes) Patient Assistant |
Magnet mode
| Parameter | Rate |
| Magnet pacing mode | AOO or VOO |
| Magnet rate, battery status "Good" | 100 min-1 (600 ms) |
| Magnet rate, battery status "Ageing" | 95 min-1 (630 ms) |
| Magnet rate, battery status "Replace PM" | 86 min-1 (700 ms) |
Warning: In magnet mode the pacemaker operates in an asynchronous pacing mode. If the intrinsic rate is higher than the magnet rate, this may induce ventricular tachycardia or ventricular fibrillation.
Exposed materials
| Item | Material | Can | Titanium |
| Connector | Polyether-Urethane (PUR) and silicone rubber |
Physical characteristics
| Chararacteristic | Value |
| Dimensionsa | 46.8 x 45.9 x 7.25 mm |
| Mass | 27.3 ± 0.5 g |
| Volume | 11.9 ± 0.5 cm3 |
| Surface area | 33.1 cm2 |
| X-ray identification | VF |
| Connector | IS-1 single chamber |
a Connector thickness may vary.
Electrical specifications
| Chararacteristic | Value | |
| Output capacitor | 3.4 μF | |
| Input impedance | ≥ 100 k Ω | |
| Current/Energy consumption | VVIR | VVI |
| Pacinga | 15.4 μA | 14.8 μA |
| Inhibited | 9.4 μA | 8.9 μA |
a 100% pacing at 60 min-1, 3.75 V, 0.4 ms, 500 Ω.
Power source
| Chararacteristic | Value | |
| Cell type | Pi 223 lithium iodine | |
| Voltage | 2.8 V (RRTa 2.6 V) | |
| Capacity | 1.4 Ah (RRTa 0.1 Ah) | |
| Battery manufacturer | MECC | |
a RRT = Recommended Replacement Time.
Interference and high rate protection
| Parameter | Value | |
| Interference detection frequency | 15.4 ± 0.5 Hz (923 ± 29 min-1) | |
| Pacing mode during interference | VOO(R) if programmed to a ventricular mode. AOO(R) if programmed to an atrial mode. OOO if programmed to the OOO mode. |
|
| Pacing rate during interference | Pacemaker behaves as if no spontaneous cardiac activity is present. If interference continues, the eventual pacing rate is either the sensor-indicated rate or the lower rate, whichever is the higher. |
|
| High rate protectiona | 205 ± 10 min-1 | |
a Atrial high rate protection for pacemakers programmed to AXX modes; ventricular high rate protection for pacemakers programmed to VXX modes.