compressions during cardiac arrest.
Here are a few Frequently Asked Questions about the ZOLL AutoPulse®Automated Chest Compression System.
What is the minimum and maximum sizes of patients that are able to be used on the board?
The AutoPulse System is designed for adults with weight of no more than 136 kg with chest circumference of 76 to 130 cm and chest width of 25 to 38 cm.
With this said, the distribution of girth of the patient will be the key determining factor. A patient weighing in excess of 136kg may be suitable for the AutoPulse if they do not have a chest size of more than 130cm.
How does the AutoPulse measure size of the patient?
The black strip on the board is a pressure sensor and measures the amount of pressure on the board when the band tightens during initial sizing. Using this measurement, the AutoPulse then calculates the amount of compression required for that specific patient.
How long does it take to apply to a patient?
Once trained, the AutoPulse takes about 20-30secs to apply. This includes cutting the clothes from the patient and application of defibrillation electrodes.
How do I apply it to a patient?
There are two basic methods that can be applied:
- Log roll – at least 3 people required
To apply the patient to the AutoPulse, extend and then open the AutoPulse LifeBand® and place on the bed next to patient. Have the other attendants roll the patient away from the board. Slide the AutoPulse onto the bed up to the patient and tuck the band on the patient side under the patient. Roll the patient back onto the board. Check alignment. Close the LifeBand, fully extend and then place on the patient's chest.
- Sit Forward Method – at least three people required
To apply the AutoPulse, extend and then open the LifeBand and have the AutoPulse resting on the head of the bed. Have two attendants slip an arm under the patient's armpit and sit the patient forward. Slide the AutoPulse down the bed, to the patient's buttocks. Lay the patient back down on the board. Check alignment. Close the LifeBand, fully extend and then place on the patient's chest.
A patient can also be transferred to a bed with an AutoPulse set up. Position the AutoPulse. Extend and open the LifeBand. Transfer the patient by split sheet, carry sheet or PAT slide onto the AutoPulse. This is the simplest and easiest way to apply the patient to the AutoPulse. Close the LifeBand.
How big is the AutoPulse and how much does weigh?
The AutoPulse is about the same size as a boogie board. Its dimensions are 82.5 cm x 46.2 cm x 8.4 cm. The AutoPulse weighs 10kg without batteries, and 12.3kg with batteries. The unit is robust and designed to withstand pressures exerted by placing large patients on it. The AutoPulse can be used in conjunction with the backpack or wheeled transporter trolley for easy mobility. As with all movable devices, correct lifting techniques should be employed.
Has the AutoPulse passed a drop test?
The AutoPulse has passed a drop test of 0.5m.
How long will the AutoPulse run for?
A new, fully charged battery will run for in excess of 30minutes. Run times of up to 45minutes are not uncommon.
Why does the AutoPulse run on 80 compressions per minute?
The AutoPulse runs at 80 compressions per minute to allow complete recoil of the chest cavity in accordance with ARC recommendations. The rate of compressions is lower than for manual, unidirectional compressions, as the chest cavity takes longer to recover from a circumferential compression.
If circumferential compressions were taking place at the rate recommended for manual compressions of 100 compressions per minute, this would compromise the 50:50 duty cycle, would not allow for complete venous return and would decrease cardiac output.
The AHA does give the AutoPulse's Load Distributing Band technology a class IIb recommendation as an adjunct to CPR.
What injuries are associated with the AutoPulse?
Manual CPR results in rib fracture in 33% and sternum fracture results in approximately 19% of all resuscitation attempts..
When the AutoPulse has been used in conjunction with manual CPR, we do not see any increase in these ratios. When AutoPulse has been used without manual CPR, no rib or sternum fractures have been seen.
The only injury that has been seen has been some superficial skin abrasion where the AutoPulse has been used for an extended period.
More injury information can be found in the whitepaper by Howard Michaels, MD: "Injuries Associated with delivery of Manual CPR and AutoPulse CPR: A literature review" in the clinical articles page.
What restrictions does AutoPulse CPR have on intubation?
There are no restrictions on intubation techniques. The same guidelines apply as for manual CPR.
What are the contra-indications for the use of the AutoPulse?
The AutoPulse is not designed for use on Pediatrics.
The only other contra-indication is trauma due to possible bleeding. The AutoPulse may increase bleeding since it improves circulation. However, if bleeding is managed it can be at the discretion of the physician to use the AutoPulse. The victim is in their most critical time if they have no pulse and AutoPulse may give them best chance for survival.
Can the AutoPulse be used on patients with breast implants?
The AutoPulse can be used on patients with breast implants. The load distribution of the AutoPulse means that far less pressure is being exerted on the chest.
What types of vital statistics are seen with compressions with the AutoPulse?
Many users of the AutoPulse report near normal vitals including:
- pedal pulses,
- blood pressures in the region of 110-120/70-80 (with adrenaline administered)
- EtCO2 levels that are interactive with AutoPulse compressions and in excess of 23 mmHg,
- SpO2 levels of between 80-90%