Philips Heartstart MRx

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HeartStart MRx Features

The Philips Heartstart MRx is a lightweight, portable monitor/defibrillator. with the capability to offer four different modes of operation; monitor, manual Defibrillate, AED, and pacing. The Heartstart MRx defibrillator was designed to provide both monitoring and resuscitation by using mutual-parameter functions, including algorithms and options for transferring data to, a full range of defibrillation therapies. The Heartstart MRx is fast and reliable with 12-lead ECG and advanced STEMI support. The MRx has a large 8-inch color screen displaying up to 4 waveforms and numerics. The Philips Heartstar MRx additionally monitors other parameters: arrhythmia detection, SpO2, NIBP, IBP, EtCO2, and temperature.

  • Easy-to-use Interface with a large color display
  • Can Display 4 waveforms and numerics, or all 12 leads and numerics
  • Screen views can be customized to fit the user’s preferences
  • Normal or high-contrast view of easy viewing in different lighting conditions
  • Seamless data transmission for 12 lead ECGs with an optimal wireless link
  • 10 hours of monitoring with 2 fully charged batteries
  • Ready-For-Use indicator
  • optimal AC or DC battery options

Philips MRx Specifications

MRx Dimensions (Without External Paddles)

  • Width: 12.4 in (31.3 cm)
  • Depth: 8.3 in (21 cm)
  • Height: 11.7 in (29.5 cm)

MRx Dimensions (With External Paddles)

  • Width: 13.4 in (34 cm)
  • Depth: 8.3 in (21 cm)
  • Height: 13.6 in (34.5 cm)


  • 13.2 lb (6kg): Base unit with 1 MRx battery, pads, and pads cable.
  • +4.1 lb (1.86 kg): With added MRx carrying case.
  • +2.5 lbs. (1.1 kg): With added MRx paddle tray and external standard paddles.


  • Water Resistance: Meets IEC 60601-2-4
  • Solids Resistance: IP2X
  • Temperature
    • Operating: 32º – 113º F (0º – 45º C)
    • Storage: -4º – 158º F (-20º – 70º C)
  • Humidity: Operating: 0% to 95% relative
  • Safety: Meets EN 60601-1, UL 2601-1, CSA C22.2 No. 601-1-M90 CSA, EN 60601-2-4

MRx Display

  • Dimensions: 8.4 in diagonal (12.8 cm x 17.1 cm)
  • Type: TFT color LCD
  • Resolution: 640 x 480 pixels (VGA)
  • Wave Viewing Time: 5 seconds (ECG)

Strip Chart Printer

  • Printer
    • Standard: 50 mm (paper width) thermal array printer.
    • Optional: 75 mm (paper width) thermal array printer.
  • Continuous ECG Strip: Prints primary ECG lead with event annotations and measurements in real-time or with a 10-second delay.
  • Auto Printing: The printer can be configured to print significant events, charge, shock, and alarms.
  • Reports: Event Summary, 12-Lead, Vital Signs Trending, Operational Check, Configuration, Status Log, and Device Information.
  • Paper Size
    • 1.97 in (50 mm) W by 100 ft. (30 m) L.
    • 2.95 in (75 mm) W by 100 ft. (30 m) L.


  • Model: MRx (M3535A)
  • Waveform: Biphasic Truncated Exponential. Waveform parameters are adjusted as a function of patient impedance.
  • Output Energy: Manual (selected): 1-10, 15, 20, 30, 50, 70, 100, 120, 150, 170, 200 Joules maximum energy, limited to 50 Joules for internal defibrillation. AED Mode (single energy output): 150 Joules into a 50-ohm load.
  • Charge Time on the MRx: Less than 5 seconds to 200 Joules with a new, fully charged lithium-ion battery at 25º C.
  • Shock Delivery: Via multifunction defib electrode pads or paddles.
  • Quick Shock: Less than 10 seconds from the cessation of CPR to shock delivery.
  • Patient Impedance Range
    • Minimum: 15 ohm (internal defibrillation); 25 ohm (external defibrillation).
    • Maximum: 150 ohm.
  • AED Mode on the MRx: Shock advisory sensitivity and specificity meet AAMI DF-39 guidelines.

MRx Battery

  • Type: 6.0 Ah, 14.8 V, rechargeable lithium ion.
  • Dimensions
    • Height: 6.5 in (165 mm)
    • Width: 3.8 in (95 mm)
    • Depth: 1.6 in (42 mm)
    • Weight: 1.6 lbs. (0.73 kg)
  • Charge Time: Approximately 3 hours to 100%, 2 hours to 80%.
  • Capacity
    • At least 5 hours of monitoring with ECG, SpO2, CO2, temperature, and two invasive pressures monitored continuously, NBP measured every 15 minutes, and 20 200J discharges (with a new, fully charged battery, operating at room temperature, 25º C).
    • At least 3.5 hours of monitoring with ECG, SpO2, CO2, temperature, and two invasive pressures monitored continuously, NBP measured every 15 minutes, and pacing at 180ppm at 160mA.
  • Battery Indicators
    • Battery gauge on battery, the capacity indicator on display; flashing RFU indicator, chirp, and ‘Low Battery’ message appears on display for low battery condition when 10 minutes of monitoring time and 6 maximum energy discharges remain (with a new battery at room temperature, 25º C).

Data Storage

  • Internal: 12 hours of continuous ECG waveforms and events, maximum capacity of 55 event summaries.
  • Data Card: 60 event summary reports or 240 megabytes of patient data.

ECG and Arrhythmia Monitoring

  • Input
    • Up to 4 ECG waves are displayed and up to 2 ECG waves print simultaneously.
    • Lead I, II, or III was obtained through a 3-lead ECG cable and separate monitoring electrodes. With a 5-lead cable, obtain leads aVR, aVL, aVF, or V. Pads ECG obtained through 2 multifunction defibrillation electrode pads.
  • Lead Fault: ‘Lead Off’ message and dashed line displayed, if an electrode or lead wire becomes disconnected.
  • Pads Fault: A dashed line is displayed if a pad becomes disconnected.
  • Heart Rate Display: Digital readout on display 15 to 300 bpm, accuracy ±10%.
  • Heart Rate Arrhythmia Alarms: HR, Asystole, VFIB/VTACH, VTACH, extreme tachycardia, extreme bradycardia, PVC rate, Pacer not capture, Pacer not pacing.
  • ECG Size: 2.5, 5, 10, 20, 40 mm/mV, autogain.

Available Options

  • Non-Invasive Pacing: SpO2 pulse oximetry.
  • Non-Invasive Blood pressure: CO2 monitoring.
  • Invasive Blood Pressure (2 lines): Continuous temperature monitoring.
  • 12-Lead Acquisition: 12-lead transmission.
  • Q-CPR Measurement and Feedback: Audio recording.
  • ACI-TIPI & TPI Predictive Instruments: Periodic clinical data transmission.
  • Batch/LAN Data Transfer


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