What you need to know about EMI
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What you need to know about EMI Everyday questions about appliances and equipment that may interact with your device. Topics. What is EMI? How can EMI affect my device? What about magnets? To Use or Not Use – How do I know? Who can I call with specific questions?. What is EMI?.

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Topics

What you need to know about EMIEveryday questions about appliances and equipment that may interact with your device


Topics

Topics

  • What is EMI?

  • How can EMI affect my device?

  • What about magnets?

  • To Use or Not Use – How do I know?

  • Who can I call with specific questions?

EMI


What is emi

What is EMI?

Electromagnetic interference: invisible lines of force

  • Produced by combination of voltage (electricity) and current flow (magnetism)

  • Signals may interfere with intended device operation

The strength of EMI is proportional to the distance from the source. The closer you are, the more of an effect EMI will have.

EMI


What is emi1

What is EMI?

Electric fields

  • Produced by voltage

  • Reduced in strength with increasing distance from the source

EMI


What is emi2

What is EMI?

Magnetic fields

  • Produced by flow of current

  • Electric field also present

  • Reduced in strength with increasing distance from the source

EMI


How can emi affect my device

How can EMI affect my device?

  • Implanted device may interpret EMI as rapid signal from heart

    • Pacemaker: may withhold pacing

    • ICD: may deliver unneeded shock

  • Effects of EMI are temporary

  • Does not usually harm device

EMI


How can emi affect my device1

How can EMI affect my device?

Most household appliances are not operated very close to the body.

Elementary physics states that if you double the distance from the magnet, the magnetic field strength will be reduced (roughly) by a factor of 8.

At a distance of 12 in (30 cm) the EMI fields surrounding most household appliances are more than 100 times lower than recommended guidelines for public safety

A magnetic field of 10 G or more will be detected by an implanted device.

World Health Organization, What is EMF?

EMI


What about magnets

What about magnets?

Magnets do the following things:

Attract certain materials - such as iron, nickel, cobalt, certain steels and other alloys

Have an effect on electrical conductors when the magnet and conductor are moving in relation to each other

Within six inches, a magnet may cause implanted devices to respond differently

Pacemaker will respond by pacing at different, pre-set rate

ICD will respond based on programming

ICD may beep; move away from object causing beep, call doctor

Pacemakers

ICDs

EMI


To use or not use how do you know

To Use or Not Use – How do you know?

  • Implanted devices are designed to work properly around most appliances and equipment.

  • Most things you handle or work near every day will not cause a problem.

  • Topics to be covered:

    • Personal Items

    • Kitchen, Tabletop, Household Items

    • Office, Shop and Yard Equipment

    • Entertainment Items

    • Travel/Environment

    • Dental and Medical Tests and Procedures

EMI


Definitions

Definitions

  • Safe under normal use:

    • Only considered safe when used normally in accordance with their intended use.

    • Check with your doctor for any additional restrictions that you may have for these items.

  • Use precaution:

    • Getting too close to these items could affect your device; when you are near any of these items, you should use precautions.

    • Check with your doctor for detailed information before using these items.

  • Do not use:

    • Strong electromagnetic and magnetic fields may affect your device.

    • Talk to your doctor. For specific brand items, consult the original manufacturer for any interaction with implantable devices.

EMI


Personal items

Personal Items

Safe under normal use

Electric blankets, toothbrushes

Hair dryers

Heating pads

Pagers

Patient alert devices

Personal digital assistants (PDAs, unless used as cell phone, see cell phone)

Use precaution

Cell phones

Keep 6 inches from device

Keep 12 inches from device if transmits more than 3 watts

Hold phone to ear on the opposite side of body from device

Do not carry phone in breast pocket or belt within 6 inches of device

Cordless phones, Electric razors

Safe as long as not placed directly over device

Hand-held massagers

Safe as long as not placed directly over device

EMI


Kitchen tabletop household items

Kitchen, Tabletop, Household Items

Safe under normal use

  • Air purifiers

  • Blenders

  • Clothes dryers

  • Convection ovens

  • Electric can openers

  • Electric ovens and stoves

  • Food processors

  • Gas ovens and stoves

  • Microwave ovens

  • Portable space heaters

  • Vacuum cleaners

  • Washing machines

EMI


Office shop and yard equipment

Office, Shop and Yard Equipment

Safe under normal use

Copy machines

Electric invisible fence

Fax machines

Personal computers

Use precaution

Keep 24 inches from device

Arc welding equipment

Running motors and alternators, especially those found in vehicles

Avoid leaning over running motors and alternators of a running vehicle

Keep 12 inches from device:

Battery-powered cordless power tools

Chainsaws

Corded drills and power tools

Lawn mowers

Leaf blowers

Shop tools (drills, table saws, etc.)

Snow blowers

EMI


Entertainment items

Entertainment Items

Safe under normal use

AM/FM radios

CD/DVD players

Hot tubs/whirlpools (with doctor’s permission)

Laser tag games

Multimedia players

iPods, MP3 players

Remote controls

TV, garage door, stereo, camera/video equipment

Tanning beds

TVs and VCRs

Video games

Use precaution

Bingo game magnetic wands

Keep 6 inches from device

CB and police radio antennas

Keep 24 inches from device

Slot machines

Keep 12 inches from device

Stereo speakers

Keep 12 inches from device

EMI


Travel environment

Travel/Environment

Use precaution

  • Security systems (i.e., airport, jail, courtroom)

    • Walk through security archways normally

    • Tell security personnel you have an implanted device and show Medical Device ID card

    • Security wand should not be held over device more than about 30 seconds; ask for hand-search if possible

  • Theft detection systems (often in store and library entrances)

    • Walk through theft detection systems at a normal pace

    • Do not lean against or linger near these systems

  • If you suspect interaction between your device and the theft detection systems, move away to decrease interference.

EMI


Dental and medical tests and procedures

Dental and Medical Tests and Procedures

Safe under normal use

Most medical and dental procedures will not affect your device. Some examples include:

Dental drills and cleaning equipment

Diagnostic x-rays

Electrocardiogram

Mammography

Inform technician you have device to ensure device does not get compressed

Diagnostic ultrasound

Use precaution

Be especially careful with the following procedures:

CT Scans

Electrocautery used in surgery

External defibrillators

Radiation therapy, lithotripsy

TENS unit

Boston Scientific. A Closer Look. Computed Tomography (CT) Scanning and Implantable Pacemakers and Defibrillators) August 18, 2008.

EMI


Do not use

Do Not Use

  • Personal Items

    • Body fat measuring scales (hand-held)

    • Magnetic mattresses or chairs

  • Office, Shop and Yard Equipment

    • Jackhammers

  • Dental and Medical Tests and Procedures

    • MRI Scans

    • Diathermy

  • Travel Entertainment

    • Stun guns

EMI


Specific questions

Specific questions?

Specific appliances, tools, medical procedures or pieces of equipment:

  • Contact your doctor

    Other resources:

  • Patient Handbook

  • Boston Scientific Patient Resources 1.866.484.3268

  • www.lifebeatonline.com

EMI


Questions

Questions?

What questions do you have about electromagnetic interference?


Important safety information

Important Safety Information

Cardiac Resynchronization Therapy Devices

  • Cardiac resynchronization therapy pacemakers (CRT-P) and defibrillators (CRT-D) are used to treat heart failure patients who have symptoms despite the best available drug therapy. These patients also have an electrical condition in which the lower chambers of the heart contract in an uncoordinated way and a mechanical condition in which the heart pumps less blood than normal. CRT-Ps and CRT-Ds are not for everyone including people with separate implantable cardioverter-defibrillators (CRT-P only) or certain steroid allergies. Procedure risks include infection, tissue damage, and kidney failure. In some cases, the device may be unable to respond to your heart rhythm (CRT-P only) or may be unable to respond to irregular heartbeats or may deliver inappropriate shocks (CRT-D only).

    Implantable Cardioverter Defibrillators

  • An implantable cardioverter defibrillator (ICD) can protect you from the effects of sudden cardiac arrest by reviving your heart rhythm. An ICD is not for everyone, including people with certain steroid allergies. Procedure risks include infection and tissue damage. In some cases, the device may not respond to irregular heartbeats or may deliver inappropriate shocks.

    Pacemakers

  • A pacemaker system can monitor and treat your heart rhythm by delivering electrical energy to pace your heart when it senses a slow rhythm. A pacemaker is not for everyone, including patients with certain steroid allergies. Patients who have additional medical conditions that may not allow the pacemaker to function appropriately should not receive a device. Procedure risks include infection, tissue damage and kidney failure. In some cases, the device may not respond to your heart rhythm.

    For All Devices

  • In rare cases severe complications or device failures can occur. Electrical or magnetic fields can affect the device. Only your doctor knows what is right for you. These devices are available by prescription only. Individual results may vary.

    Device Quality and Reliability

  • It is Boston Scientific’s intent to provide implantable devices of high quality and reliability. However, these devices may exhibit malfunctions that may result in lost or compromised ability to deliver therapy. Refer to Boston Scientific’s CRM product performance report on www.bostonscientific.com for more information about device performance, including the types and rates of malfunctions that these devices have experienced historically. While historical data may not be predictive of future device performance, such data can provide important context for understanding the overall reliability of these types of products. Also, it is important that you talk with your doctor about the risks and benefits associated with the implantation of a device.

    (Rev. B)

EMI


Thank you

Thank you!

This presentation was sponsored byBoston ScientificCardiac Rhythm Management

We work to improve the quality of life for cardiac patients and those who care for them.


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