Overview: Pacemakers and defibrillators are life-saving medical devices implanted in patients to regulate heart rhythms. They are essential in managing arrhythmias and preventing complications such as heart failure or sudden cardiac death. This is similar technology used in life-saving measures when a patient’s heart stops. These devices work by monitoring heart activity and delivering electrical impulses to maintain a normal heartbeat.

Pacemakers:

• What is a Pacemaker?
  • A pacemaker is a small device implanted under the skin, usually near the collarbone, to help control abnormal heart rhythms (arrhythmias). It sends electrical impulses to the heart to ensure it beats at a normal rate and rhythm.
• Types of Pacemakers:
  • Single-Chamber Pacemaker: Connected to one chamber of the heart, typically the right ventricle.
  • Dual-Chamber Pacemaker: Connected to both the right atrium and right ventricle, coordinating the timing between the two chambers.
  • Biventricular Pacemaker (Cardiac Resynchronization Therapy or CRT): Used in patients with congestive heart failure with up to three wires to ensure the ventricles contract together, improving the heart’s efficiency.
  • Leadless pacemakers: Small compact and wireless devices inserted directly into the right ventricle for direct pacing without requiring an incision to implant the device.
• How it Works:
  • The device consists of a pulse generator (battery and electronic circuitry) and wires called leads (except for leadless pacemakers) that deliver electrical impulses to the heart muscle.
  • It continuously monitors heart rhythms and activates, sending electrical impulses to ensure the heart beats normally. These electrical impulses are not specifically felt.
• Indications for Use:
  • Bradycardia (slow heart rate).
  • Heart block (delay or blockage of electrical signals).
  • Atrial fibrillation that recurs despite medications or ablation.
• Benefits:
  • Improves symptoms like fatigue, dizziness, and fainting.
  • Enhances quality of life and exercise capacity.
  • Reduces the risk of heart failure and other complications.

Defibrillators:

• What is a Defibrillator?
  • An implantable cardioverter defibrillator (ICD) is a device that monitors heart rhythms and delivers shocks to restore normal rhythm when it detects life-threatening arrhythmias, such as ventricular tachycardia or ventricular fibrillation.
• Types of Defibrillators:
  • Single-Chamber ICD: Monitors with one wire and can shock the heart for dangerous abnormal heart rhythms. It can also serve as a back-up pacemaker for the right ventricle.
  • Dual-Chamber ICD: Monitors with two wires and can shock the heart for dangerous abnormal heart rhythms. It can also act as a standard pacemaker with the ability to pace both the right atrium and right ventricle.
  • Biventricular ICD (CRT-D): Combines the functions of a biventricular pacemaker and an ICD, used for heart failure patients. It monitors the heart with up to three wires and can pace the heart to ensure the ventricles contract together and can also shock the heart for dangerous abnormal heart rhythms.
  • Subcutaneous ICD: Monitors the heart with one wire inserted underneath the skin over the left side of the chest and can shock the heart for dangerous abnormal heart rhythms without needing to be implanted inside the bloodstream or the heart directly.
• How it Works:
  • The ICD has a pulse generator and leads that are placed in the heart or on its surface.
  • It continuously monitors heart rhythms and can perform pacing, cardioversion (mild shocks), or defibrillation (strong shocks) to correct dangerous life-threatening arrhythmias.
• Indications for Use:
  • Severe congestive heart failure with risk of dangerous abnormal heart rhythms.
  • Prior treated ventricular tachycardia or ventricular fibrillation.
  • Other uncommon heart conditions with risk of dangerous abnormal heart rhythms.
• Benefits:
  • Can improve symptoms with pacing function, similar to pacemakers.
  • Provides life-saving measures from life-threatening arrhythmias.

Procedure Details:

• Preparation:
  • Comprehensive evaluation, including electrocardiogram (ECG), echocardiogram, and heart monitoring.
• During the Procedure:
  • Performed under sedation and use of local anesthesia.
  • Incision is made over the left chest and the wires are inserted into the heart through a vein that carries blood to the heart.
  • The wires are positioned in the heart and then connected to the generator.
  • The incision is closed.
• Recovery:
  • Patients are usually monitored overnight.
  • Full recovery typically takes a few weeks for the incision to heal and patients are instructed to restrict use of the left arm for about 4 weeks.
  • Patients are monitored closely in our device clinic to ensure recovery and normal device function.

Why Choose Us:

Our electrophysiology team at Cardiac Specialists with Drs. Winslow, Chiravuri, and Lawlor are experienced in performing these device implants with the latest technology and techniques. We offer comprehensive pre-procedure evaluation, thorough counseling and education, expert and timely implantation, and dedicated post-procedure care to ensure appropriate treatment and recovery for our patients.

For more information on pacemaker and defibrillator implants and to schedule a consultation, please contact us.