When the heart or lungs reach a point of "catastrophic exhaustion"—where medications, stents, and even standard surgeries can no longer keep the body's vital organs perfused—medicine turns to the heavy hitters. Mechanical Circulatory Support (MCS) represents the pinnacle of biomedical engineering. These devices don’t just "help" the heart; they can effectively take over its entire workload. Whether it’s an external machine breathing for you or an implanted pump acting as an "artificial heart," MCS is about buying time: time to heal, time to find a donor heart, or time to live a full life when the natural heart has given up.
1. What is it? Any common name for this procedure?
Mechanical Circulatory Support is a broad category of life-sustaining technologies. There are three primary "players" in this field:
- ECMO (Extracorporeal Membrane Oxygenation): This is essentially a high-intensity heart-lung bypass machine kept at the bedside. It draws blood out of the body, removes carbon dioxide, adds oxygen, and pumps it back in. It does the work of both the heart and the lungs.
- LVAD (Left Ventricular Assist Device): This is a mechanical pump that is surgically implanted inside the chest. It helps the weakened left ventricle (the heart's main pumping chamber) move blood to the rest of the body. A cable called a "driveline" exits the skin to connect to an external controller and batteries.
- RVAD (Right Ventricular Assist Device): Similar to the LVAD, but specifically designed to support the right side of the heart, which pumps blood to the lungs. It is often used temporarily after a major heart attack or surgery.
Common Names: Heart Pump, Artificial Heart, Life Support Machine, VAD, "The Bridge," or "The Bionic Heart."
2. Common Symptoms at which one must meet the doctor
Patients requiring MCS are typically in a state of Advanced Heart Failure or Cardiogenic Shock. You (or a loved one) must seek immediate specialist care if you experience:
- Persistent Shortness of Breath at Rest: Feeling as though you are suffocating even while sitting still or sleeping.
- Inability to Lie Flat: Needing to sit upright in a chair to breathe.
- Severe Confusion or Altered Mental State: A sign that the brain is not receiving enough oxygenated blood.
- Oliguria (Decreased Urination): A critical warning sign that the kidneys are failing due to low blood flow.
- Cyanosis: A bluish tint to the lips, fingers, or toes.
- Extreme Fatigue: The inability to walk across a room without stopping to rest.
3. List of Associated Diseases
These devices are the final line of defense for several life-threatening conditions:
- End-Stage Heart Failure: Where the heart muscle is too weak to sustain life.
- Severe Cardiomyopathy: Including dilated, hypertrophic, or restrictive types.
- Acute Myocarditis: Sudden inflammation of the heart muscle, often from a virus.
- Post-Cardiotomy Shock: When the heart fails to "restart" properly after an open-heart surgery.
- Severe Pulmonary Embolism: A massive blood clot in the lungs that causes the right heart to fail (requiring ECMO or RVAD).
- Refractory Cardiac Arrest: When standard CPR and shocks fail to restore a rhythm.
4. List of Screening Tests for this Procedure
Because these procedures are high-stakes, the evaluation is incredibly thorough:
- Right Heart Catheterization: To measure the exact pressures inside the heart chambers and lungs.
- Transthoracic and Transesophageal Echocardiogram: To visualize the heart's valves and determine which ventricle is failing.
- Cardiopulmonary Exercise Testing (CPET): To measure the maximum amount of oxygen the body can use.
- Arterial Blood Gas (ABG): To check the oxygen and CO2 levels in the blood (critical for ECMO).
- Organ Function Panel: Extensive blood tests to ensure the liver and kidneys are healthy enough to survive the surgery.
- Psychosocial Evaluation: (For LVAD) To ensure the patient and their family can manage the complex external equipment.
5. Am I eligible for this procedure?
Eligibility is usually categorized by the "goal" of the treatment:
- Bridge to Transplant (BTT): You are eligible if you are on the heart transplant waiting list but your heart is failing too fast to wait for a donor.
- Destination Therapy (DT): You are eligible for a permanent LVAD if you have end-stage heart failure but are not a candidate for a transplant (due to age or other health factors).
- Bridge to Recovery (BTR): You are eligible for temporary support (ECMO/RVAD) if your heart failure is reversible (like myocarditis).
- Ineligibility: Generally, patients with active systemic infections, advanced cancer, or severe irreversible brain damage are not considered eligible for long-term MCS.
6. Pre and Post Care for this Procedure
Pre-Procedure Care:
- Stabilization: Most patients are already in the ICU on IV "inotropes" (heart-strengthening meds) before the device is placed.
- Education: For LVAD, the patient and their "care partner" must learn how to change batteries, manage the controller, and handle "alarms."
- Nutrition: High-calorie, high-protein supplements are often given to build strength for the recovery.
Post-Procedure Care:
- Driveline Care: (For LVAD) The site where the cable exits the skin must be cleaned with sterile technique daily to prevent life-threatening infections.
- Anticoagulation: Because the blood is touching "plastic and metal" parts, you must take blood thinners (usually Warfarin) indefinitely to prevent clots.
- Power Management: You must always have two power sources (batteries or a wall outlet) connected to the device.
- Cardiac Rehab: A structured program to slowly rebuild the body's muscles, which often waste away during heart failure.
7. Days Required for Hospitalization
Mechanical circulatory support involves some of the longest hospital stays in medicine. For an ECMO patient, the stay is usually 14 to 30 days, often entirely in the ICU. For a permanent LVAD, the stay is typically 21 to 45 days, as the patient needs significant time for the surgical wound to heal and for intensive "equipment training."
Disclaimer: As per doctor’s advise the number of day’s may get modified based on the speed of organ recovery, the presence of any infections, and the patient’s ability to safely manage the device at home.
8. Benefits of this Procedure
- Immediate Survival: These devices are often the only reason a patient survives a "death-sentence" cardiac event.
- Improved Quality of Life: For many LVAD patients, they go from being unable to walk to being able to hike, travel, and return to work.
- Organ Recovery: By taking the "load" off the heart, MCS allows other organs like the kidneys and liver to recover from the effects of poor blood flow.
- The "Bridge": It provides a safety net for patients waiting for a transplant, ensuring they are healthy and strong enough for the transplant surgery when a donor heart becomes available.
Reversibility: In some cases, the heart gets so much "rest" from the device that it actually heals, and the device can eventually be removed.
