An implantable cardioverter-defibrillator (ICD) is placed through a minor surgical procedure that typically takes one to two hours and does not require open-heart surgery in most cases. The most common approach involves a small incision near the collarbone, with thin wires threaded through a vein into the heart. Most people go home the same day or the next morning.
The Transvenous Approach: Step by Step
The transvenous method is the standard for ICD implantation. Here’s what happens during the procedure:
You’ll lie on a table in a procedure room that looks similar to an operating room. In most cases, you receive a local anesthetic injection to numb the skin near your collarbone rather than being put fully under. A large study of over 11,000 device implant procedures found that 76% used local anesthesia alone (sometimes with mild premedication), 16% involved sedation, and only 7% required general anesthesia. If you’re anxious or experiencing discomfort, the team can add sedation during the procedure.
Once the area is numb, the surgeon makes a small incision just below the collarbone, typically on the left side. Through this incision, they access a vein, most commonly the axillary vein or the cephalic vein, to thread one or more thin, flexible wires (called leads) into the heart. The surgeon uses real-time X-ray imaging (fluoroscopy) to guide the leads into the correct chambers. One lead typically sits in the lower right chamber of the heart, where it can detect dangerous rhythms and deliver a shock if needed.
Next, the surgeon creates a small pocket just under the skin below the collarbone to hold the pulse generator, which is roughly the size of a matchbox. The leads are connected to this generator, and the entire system is tested. The team may briefly trigger an abnormal heart rhythm to confirm the device detects it and responds correctly. Once everything checks out, the incision is closed with stitches or adhesive strips, and the system is tested one final time before you’re moved to recovery.
The Subcutaneous Alternative
A subcutaneous ICD (S-ICD) is a newer option that avoids threading any wires into the heart or veins. Instead, the pulse generator is placed on the left side of the chest, tucked between two layers of muscle along the ribcage (between the latissimus dorsi and serratus anterior muscles, roughly at armpit level near the fifth or sixth rib). A single lead runs just under the skin along the breastbone rather than inside the heart.
This approach eliminates the risks that come with placing leads inside blood vessels and the heart, such as vein blockage or lead-related heart damage. The tradeoff is that a subcutaneous ICD cannot provide pacing therapy for slow heart rhythms, so it isn’t suitable for everyone. Your cardiologist will determine which type fits your situation based on the specific rhythm problems you have.
What Anesthesia Feels Like
Since most transvenous implantations use local anesthesia, you’ll be awake but shouldn’t feel pain at the surgical site. You may feel pressure, tugging, or brief moments of discomfort as the leads are positioned. Some people feel a strange fluttering sensation when the leads enter the heart chambers. If the team tests the device by inducing a brief arrhythmia, you’ll typically be given a short-acting sedative so you’re not conscious for that moment. The experience is closer to a catheter procedure than a traditional surgery.
Recovery in the First Few Weeks
The incision area will be swollen and tender for a few days to a few weeks. Most people manage this with over-the-counter pain relievers. The key restrictions during recovery focus on protecting the leads while they settle into position inside the heart:
- First four weeks: Avoid heavy lifting and vigorous upper-body activity.
- First eight weeks: Do not make sudden movements that raise your left arm above your shoulder. Gentle, gradual arm movement is fine and encouraged to prevent stiffness.
You can usually walk, do light daily tasks, and shower within a day or two (once the incision is covered or cleared by your care team). Most people return to work within one to two weeks if their job doesn’t involve heavy physical labor.
Driving After Implantation
Driving rules vary by country and by the reason you received the ICD. In many jurisdictions, private drivers face a restriction of about two months after implantation. If the ICD fires an appropriate shock while you’re living with it, restrictions typically range from two to four months depending on whether the device was placed preventively or after a cardiac arrest. Professional or commercial drivers face significantly stricter, often permanent restrictions. Your care team will give you specific guidance based on local regulations.
Possible Complications
ICD implantation is considered a low-risk procedure, but complications do occur in a small percentage of cases. In one study tracking patients for a year after implantation, the overall complication rate was about 8.5%. Individual complications were each uncommon: pneumothorax (air leaking into the chest cavity), lead failure, infection, and heart perforation each occurred in roughly 1 to 3% of patients. Blood clots in the arm veins near the leads were the most frequently reported issue at about 2.8%.
Signs of a problem include fever, increasing redness or drainage at the incision site, swelling in the arm on the side of the device, or sudden shortness of breath. These warrant prompt contact with your care team.
How Long the Device Lasts
The leads inside the heart are designed to last many years and often do not need replacement. The pulse generator, however, runs on a battery that eventually depletes. Manufacturers generally project a lifespan of 5 to 9 years, but real-world data paints a more optimistic picture. A large prospective study found the median battery life was 10.8 years for single-chamber devices and 8.5 years for dual-chamber devices. After 7 years, 94% of single-chamber ICDs were still functioning.
When the battery runs low, your device will alert your care team during a routine check (most modern ICDs transmit data wirelessly from home). Replacing the generator is a simpler procedure than the original implantation: the surgeon reopens the chest pocket, disconnects the old generator, connects a new one to the existing leads, and closes the incision. The leads themselves are typically left in place.