ZOLL M Series

Defibrillator / Monitor / Pacer

If you are searching for a cost-effective solution for your medical team, E LECOTEK has the right equipment for you.

The ZOLL M Series products were designed for use in both the hospital and the rugged EMS environment. Its compact and lightweight design makes it the ideal device for transport and emergency rooms. The standard version combines monitor, defibrillator (monophasic or biphasic waveform) and pacer in a single instrument. The CCT (=critical care transport) option adds a larger color screen, two more channels for invasive blood pressure and temperature.

The following table shows the main advanced capabilities of the M Series.


Depending on the configuration, M Series products can display, record, or print 3-lead or 12-lead ECGs.

Advanced monitoring capabilities allow measurement of vital parameters:

  • Non-invasive Blood Pressure (NiBP)
  • Pulse-oximetry (SpO2)
  • Optional end-tidal carbon-dioxide (etCO2)

With CCT Option

  • Invasive pressure blood
  • Body temperature

The defibrillation unit of the M Series products provides advanced functionality for advanced cardiovascular life support (ACLS) or basic life support (BLS):

· Automated External Defibrillator (AED) for BLS teams

  • Advisory Defibrillation
  • Manual Defibrillation
  • Synchronized Cardioversion

CPR Assistance with the use of CPR-D-padz

    • Real CPR Help® - provides feedback about the quality of CPR derived from compression rate and depth measurement.



Noninvasive Transcutaneous Pacing (NTP) for ALS teams


Optional, wireless Bluetooth communication with a ZOLL-approved host system (handheld device or PC running ZOLL Data Relay software)

    AED = Automated External Defibrillator, BLS = Basic Life Support, ALS = Advanced Life Support

ZOLL introduced the M Series in 1998. At the time, it was one of the most compact and most advanced defibrillators worldwide. ZOLL's well-designed, standardized user interface has stood the test of time. The front panel of the M Series remained unchanged but, as new technologies became available, ZOLL continuously upgraded the capabilities of the M Series. The CCT option introduced more monitoring options for invasive blood pressure and temperature. Monophasic defibrillation up to 360 Joule was replaced by energy-efficient, biphasic defibrillation (max. 200 Joule). Other new features were color LCD, 12-Lead ECG monitoring and interpretation, end-tidal carbon dioxide, and Bluetooth communication.


The standard M Series uses a high-resolution EL or LCD monitor (5.66 in.) whereas the CCT option provides a large, color LCD screen (6.5 in.) (see picture).

The M Series can continuously read the patient's ECG via 3-Lead or 5-Lead patient cable. The optional 12-Lead ECG can be interpreted by the GE 12SL Analysis Program and printed in a 4x3 format or 2x6 format for faxes. The standard configuration of the M Series includes SpO2 monitoring and optional etCO2.

For many years, the M Series CCT has been the preferred choice of emergency physicians, anesthetists and critical care doctors for the transport of critically-ill patients.

If supplied with the XL battery (sealed lead acid), the M Series can deliver 60 defibrillator discharges at maximum energy, or 4 hours of continuous ECG monitoring, or 3.25 hours of continuous ECG monitoring/pacing at 60 mA, 80 beats/min.


Depending on the version (ACLS or BLS) the defibrillator can be run in different modes:

  • Manual Mode
  • Advisory Mode
  • AED Mode
  • Synchronized Cardioversion

The M Series uses a biphasic waveform as it is standard now which can deliver up to 200 Joule. The monophasic defibrillation (max. 360 J) is still in use in some machines.

AED Mode

The AED and advisory mode of the M Series automatically recognizes a shockable rhythm, e.g. pulseless ventricular tachycardia (VT) and ventricular fibrillation (VF). The machine displays all relevant commands on the screen and uses voice prompts to alert and instruct the emergency staff.

In case of an in-hospital cardiac arrest, skilled personnel trained in ACLS must exclude contraindications as follows:

  • Dysrhythmias due to enhanced automaticity (digitalis toxicity, catecholamine-induced arrhythmia)
  • Multifocal atrial tachycardia

In these conditions cardioversion is associated with a higher incidence of post-shock VT and VF.

Synchronized Cardioversion

The M Series is also capable of synchronized defibrillation (Softkey: SYNC ON) by discharging the shock with the next detected R wave. This helps to avoid the vulnerable T-wave segment of the cardiac cycle. Indications for electrical cardioversion include supraventricular tachycardia (SVT), atrial fibrillation or flutter, and VT with pulse.

To see the M Series in action and to learn about synchronized and non-synchronized defibrillation, Medscape has published educational videos about Defibrillation and Cardioversion .

CPR Assistance

Real CPR Help®

The American Heart Association (AHA) Guidelines for CPR and ECC emphasize the importance of high-quality CPR. Chest compressions must be applied at an adequate rate and depth. The recommended chest compression rate is 100 to 120 per min. The depth of the chest compression adults should be at least 2 inches (5 cm) but not greater than 2.4 inches (6 cm). When used with CPR-D•padz, the M Series applies a Real CPR Help® algorithm to provide rescuers with feedback about the quality of the delivered CPR. The Real CPR Help® uses the following to achieve high-quality CPR:

  • CPR Compressions Indicator
  • CPR Idle Time Display
  • CPR Metronome

Non-invasive Transcutaneous Pacing (NTP)

In case of severe bradycardia, the pacer version of the M Series can deliver three types of pacing

  1. Demand pacing with ventricular pacing rate above patient's intrinsic rate
  2. Stand-by pacing with ventricular pacing rate below patient's intrinsic rate as a backup
  3. Asynchronous pacing, if no ECG electrodes can be placed, e.g. burns patients (ASYNC ON)

The Multi-Function Electrode (MFE) Pads are attached to the thorax place in an anterior (pre-cordial) and posterior position. The M Series pacemaker allows for continuous adjustment of the output current between 0 and 140 mA. The pacing rate is continuously variable from 30 to 180 pulses per minute (ppm).

Transmission of 12-Lead ECG

Some of the M Series systems offer Bluetooth capability for wireless transmission of the 12-lead ECG and trend data to a remote device running ZOLL Data Relay software. This enables EMS staff to transmit ECGs to the hospital ahead of patient arrival. The ECG arrives within seconds in the software system of the receiving emergency or cardiology department.