Implantable Cardioverter Defibrillator (ICD) Insertion
What is an implantable cardioverter defibrillator?
An implantable cardioverter defibrillator (ICD) is a small electronic device connected
to the heart. It's used to continuously monitor and help control fast and sometimes
life-threatening electrical problems with the heart.
The ICD is about the size of a stopwatch. It's often implanted under the skin just
below the collarbone. It has a pulse generator and wires (leads). The pulse generator
has a battery and a tiny computer. One or more leads connect the pulse generator to
specific places in the heart. A newer type of defibrillator is implanted several inches
below your armpit. The lead for this defibrillator is put underneath the skin over
the heart and the breastbone.
The ICD responds to fast life-threatening heart rhythms from the lower chambers of
the heart. Sometimes the ICD restores normal heart rhythm by briefly sending out a
controlled burst of impulses (called "overdrive" pacing). Other times a brief shock
(defibrillation) resets the heart rhythm if needed to prevent sudden cardiac arrest.
An ICD also records and stores information about your heart rhythm and treatments
delivered by the ICD for your doctor to review.
Most people are unaware when the ICD is pacing the heart. But a defibrillation shock
is often described as feeling like a "kick in the chest."
The ICD with a wire inside the heart can also be made to work as a basic pacemaker
as needed. Sometimes after a shock is delivered, the heart may beat too slowly. The
ICD has a "backup" pacemaker. This can stimulate the heart to beat faster until the
normal heart rhythm returns. The ICD can act as a pacemaker any time the heart rate
drops below a certain rate. The newer type of defibrillator that has the wire only
under the skin can't function as a long term pacemaker.
Why might I need an ICD?
You may need an ICD if you have survived sudden cardiac arrest because of ventricular
fibrillation. Or you may need one if you have fainted from ventricular arrhythmia,
or if you have certain inherited heart conditions.
You generally will need an ICD if you are at high risk for cardiac arrest because
of a ventricular arrhythmia. This includes having heart failure and problems with
the contraction of the heart, such as abnormal left ventricular ejection fraction.
There may be other reasons for your doctor to advise an ICD.
What are the risks of an ICD?
Possible risks of ICD insertion include:
Reaction to the medicine (anesthesia or sedative) used during the procedure
Swelling or bruising in the upper chest area where the ICD device is placed
Bleeding from the wound site
Damage to the blood vessel at the wire insertion site
Dislodging of the leads. This requires another procedure to reposition the leads.
Mechanical problems with the ICD device
Kidney damage from the contrast used during the procedure to place the device if needed
ICD shocks for other fast-abnormal heart rhythms that are not life-threatening. Or
ICD shocks triggered by electromagnetic interference in your surroundings.
If you are pregnant or think that you could be, or are currently breastfeeding, tell
your healthcare provider.
If you are allergic to or sensitive to any medicines or latex, tell your healthcare
Lying still on the procedure table for the length of the procedure may cause some
discomfort or pain.
There may be other risks depending on your specific health condition. Be sure to discuss
any concerns with your healthcare provider before the procedure.
How do I get ready for an ICD?
Your doctor will explain the procedure and ask if you have any questions.
You will be asked to sign a consent form that gives your permission to do the test.
Read the form carefully and ask questions if something is not clear.
Tell your doctor if you are sensitive to or are allergic to any medicines, iodine,
latex, tape, or anesthesia medicines (local and general).
You will need to fast for a certain period before the procedure. Your doctor will
tell you how long to fast, usually overnight.
If you are pregnant or think that you could be, tell your doctor.
Tell your doctor of all medicines you take. This includes prescription and over-the-counter
medicines, and herbal or other supplements.
Tell your doctor if you have heart valve disease. You may need to take an antibiotic
before the procedure.
Tell your doctor if you have a history of bleeding disorders or if you are taking
any blood-thinning medicines (anticoagulants), aspirin, or other medicine that affect
blood clotting. You may be told to stop some of these medicines before the procedure.
Your doctor may request a blood test before the procedure to see how long it takes
your blood to clot. You may need other blood tests and a chest X-ray.
You may get medicine (sedative) before the procedure to help you relax.
Based on your health condition, your doctor may ask you to do other things to get
How is an ICD implanted?
You may have an ICD implanted as an outpatient or as part of your stay in a hospital.
Procedures may vary depending on your condition and your doctor’s practices.
Generally, an ICD insertion follows this process:
You will be asked to remove any jewelry or other objects that may interfere with the
You will be asked to remove your clothing and will be given a gown to wear.
You will be asked to empty your bladder before the procedure.
An IV (intravenous) line will be started in your hand or arm for injection of medicine
You will be placed on your back on the procedure table.
You will be connected to an electrocardiogram (ECG) monitor that records the electrical
activity of the heart during the procedure. Your heart rate, blood pressure, breathing
rate, oxygenation level, and other vital signs will be monitored during the procedure.
. Hair may be shaved or clipped.
Large electrode pads will be placed on the front and back of the chest.
You will get medicine (sedative) in your IV before the procedure to help you relax.
The healthcare staff will clean the ICD insertion site with antiseptic soap.
Sterile towels and a sheet will be placed around this area.
The staff will inject a local anesthesia into the skin at the insertion site.
Once the anesthesia takes effect, the doctor will make a small cut (incision) at the
The doctor will put a sheath (introducer) into a blood vessel, usually under the collarbone.
The sheath is a plastic tube through which the ICD lead will be inserted into the
blood vessel and advanced into the heart.
It will be very important for you to remain still during the procedure. This is so
that the catheter does not move out of place. It helps prevent damage to the insertion
The doctor will put the lead through the introducer into the blood vessel. They will
advance the lead wire through the blood vessel into the heart.
Once the lead wire is inside the heart, it will be tested to make sure that it is
in the correct place and that it works. The doctor may insert 1, 2, or 3 leads, depending
on the type of device your doctor has chosen for your condition. The doctor will use
fluoroscopy to put the lead in the correct spot. Fluoroscopy is a special type of
X-ray that will be displayed on a TV monitor.
The doctor will slip the ICD generator under the skin through the incision just below
the collarbone after the lead is attached to the generator. Generally, if you are
right-handed, the device will be placed in your upper left chest. If you are left-handed,
the device may be placed in your upper right chest.
The doctor will watch the ECG to monitor how well the ICD is working. They may do
certain tests to assess the device function. The tests will also make sure there are
no complications after the procedure.
The skin incision will be closed with stitches, adhesive strips, or special glue.
A sterile bandage or dressing will be applied.
For the ICD that uses a wire only underneath the skin, the generator will be placed
in the left armpit area with the wire tunneled to the mid chest and then over the
breastbone. A second smaller incision is made just beneath the breastbone to secure
the wire to the body.
What happens after an ICD is implanted?
In the hospital
After the procedure, you may be taken to the recovery room for observation or you
may go to your hospital room. A nurse will watch your vital signs.
Tell your nurse right away if you feel any chest pain or tightness, trouble breathing,
or any other pain at the incision site.
After a period of bed rest, you may get out of bed with help. The nurse will help you
the first time you get up. The nurse will check your blood pressure while you are
lying in bed, sitting, and standing. Move slowly when getting up from the bed so you
won't have any dizziness from the period of bed rest. You will be able to eat or drink
once you are completely awake. Your arm may be in a sling for a day or so. How long
you will need to wear a sling will depend on your provider. Some people are asked
to wear it at night while they sleep after the first couple of days but can take it
off during the day.
The insertion site may be sore or painful. You may get pain medicine, if needed. After
the procedure, you may have a chest X-ray to check the lung and make sure the systems
Your doctor will visit with you in your room while you are recovering. The doctor
or healthcare team will give you specific instructions and answer any questions you
If the procedure is done as an outpatient, you may be able to leave after you have
completed the recovery process. But it's common to spend at least 1 night in the hospital
after ICD implantation for observation.
Arrange to have someone drive you home from the hospital after your release.
You should be able to return to your daily routine in a few days. Your doctor will
tell you if you need to take more time in returning to your normal activities. You
may be told to limit movement of the arm on the side that the ICD was placed, based
on your doctor's preferences.
You will most likely be able to resume your normal diet, unless your doctor tells
Keep the insertion site clean and dry. You will be given instructions about bathing
and showering. Your doctor will give you specific instructions about driving. You
won't be able to drive until your doctor says it's OK. These limitations will be explained
to you, if they apply to you.
You will be given specific instructions about what to do the first time your ICD delivers
a shock. For instance, you may be told to dial 911 or go to the nearest emergency room in the event of a shock from the ICD. Calming
yourself with slow deep breaths can be helpful if you are anxious after a shock.
Ask your healthcare team when you will be able to return to work. The nature of your
job, your overall health, and your progress will determine how soon you may return
After implantation, your ICD will need regular evaluation (interrogation). This is
done to assess its function and battery status. It is also to check for any significant
events stored by the device. Your doctor will tell you when and how this is done.
A home monitor may be provided to you that can communicate with your ICD wirelessly.
Information about ICD function can then be related to your doctor over the internet.
Tell your doctor right away if you have any of the following:
Fever or chills
Increased pain, redness, swelling, or bleeding or other drainage from the insertion
Chest pain or pressure, nausea or vomiting, profuse sweating, dizziness or fainting
If your device generator feels loose or like it is wiggling in the pocket under the
Your doctor may give you other instructions after the procedure, depending on your
Living with an ICD
Take the following precautions when you have an ICD implanted. Discuss the following
in detail with your doctor, or call the company that made your device:
Always carry an ID card that states you have an ICD. In addition, you may want to
wear a medical ID bracelet showing that you have an ICD.
If you travel by air, tell security screeners that you have an ICD before going through
the metal detector. (It may help to say you have a pacemaker. This is true because
pacemaker functions are built into most ICDs. Security may not know what an ICD is.)
In general, airport security detectors are safe for pacemakers and ICDs, but the small
amount of metal in the device and leads may trigger the alarm. If you are selected
for additional screening, politely remind the screener that the security wand contains
a magnet. The magnet may interfere with the programming or function of the ICD (pacemaker)
if it's held over the device for more than a few seconds.
Anti-theft systems or electronic article surveillance (EAS) used in department stores
may interact with an ICD. Don't lean on or stand in this equipment. But it is OK to
pass quickly through the detection system.
Stay away from large magnetic fields such as power generation sites and industrial
sites such as automobile junkyards that use large magnets.
If an MRI has been advised for you, contact your doctor. Newer ICDs are compatible
with MRI scanners with some restrictions.
Don't use diathermy. This is the use of heat in physical therapy to treat muscles.
Don't use a heating pad directly over your ICD.
Don't have transcutaneous electrical nerve stimulation (TENS) therapy. Talk with your
doctor if you are considering this treatment.
Turn off large motors, such as cars or boats, when working on them. They may create
a magnetic field.
Stay away from high-voltage and radar machinery. This includes radio and TV transmitters,
electric arc welders, high-tension wires, radar installations, and smelting furnaces.
If you are scheduled for surgery, let the surgeon know well ahead of the operation
that you have an ICD. Also talk with your cardiologist before the procedure to find
out if you need any special safety measures.
When involved in a physical, recreational, or sporting activity, protect yourself
from injury to the ICD. A blow to the chest near the ICD can affect its functioning.
If you are hit in that area, you may want to see your doctor.
Always see your doctor when you feel ill after an activity, or when you have questions
about beginning a new activity.
Always talk with your doctor if you have any questions about using equipment near
Your healthcare provider may give you a list of other devices and procedures to stay
Cell phones and other electronic devices
Be careful when you use a cell phone or other electronic devices. Follow these tips:
Keep them at least 6 inches away from your ICD.
It's safest to hold all cell phones to the ear farthest from your ICD or use the speaker
Don’t carry your phone or electronic device in your chest pocket, over the ICD. Instead,
carry your cell phone or other electronics in a pocket or bag below your waist.
Most cell phones and electronic devices don't interfere with ICDs. But some cell phones
and electronic devices such as smart watches use powerful magnets for wireless charging.
This may interfere with the normal function of your pacemaker or ICD.
The charging device itself and other magnet accessories can also interfere with the
normal function of your pacemaker or ICD. Store these devices at least 15 inches away
from your pacemaker or ICD.
Follow any other instructions given to you by your healthcare provider or from the
manufacturer of your pacemaker or ICD.
Before you agree to the test or the procedure make sure you know:
The name of the test or procedure
The reason you are having the test or procedure
What results to expect and what they mean
The risks and benefits of the test or procedure
What the possible side effects or complications are
When and where you are to have the test or procedure
Who will do the test or procedure and what that person’s qualifications are
What would happen if you did not have the test or procedure
Any alternative tests or procedures to think about
When and how will you get the results
Who to call after the test or procedure if you have questions or problems
How much will you have to pay for the test or procedure