Transcatheter Surgery- Innovations

Introduction

Progress in diagnostics, devices, and technology has facilitated the development of innovative transcatheter techniques for treating heart conditions in patients unsuitable for surgery due to their advanced age and multiple comorbidities. These patients, often referred to as 'no option' patients, would otherwise be left to endure their conditions and face mortality. This has instilled fresh optimism in these patients.

What Is Transcatheter Aortic Valve Replacement?

Transcatheter aortic valve replacement (TAVR) is a medical treatment used to replace a constricted aortic valve that fails to fully open. The aortic valve is between the heart's left ventricle and the body's primary artery. Aortic valve stenosis refers to the constriction of the aortic valve. The valve issue obstructs or hinders blood circulation from the heart to the rest of the body.

TAVR is a procedure that involves smaller incisions compared to open-heart valve surgery, making it less invasive. Transcatheter aortic valve replacement (TAVR) may be a viable alternative for individuals who are not suitable candidates for traditional open-heart surgery to replace the aortic valve. Transcatheter aortic valve replacement (TAVR) can effectively alleviate angina, dyspnea, and other symptoms associated with aortic valve stenosis.

What Are the Various Techniques Used to Perform TAVR?

TAVR can be performed using various methods by the physician, depending on the health of blood vessels and overall health.

• The femoral artery, a blood vessel located in the groin or thigh, is the most frequently used for a TAVR. The physician directs a catheter containing the replacement valve through the femoral artery to the heart.

• If the femoral artery is either too narrow or damaged, the physician may use blood vessels in the chest to direct the tube to the heart. This method is known as transapical access.

• Suppose the leg arteries of a patient are too narrow or diseased to accommodate a more conventional approach; stomach area blood vessels may be employed for TAVR. This method, known as transcranial access, was devised by researchers to ensure that TAVR is accessible to high-risk patients. It is less prevalent. The doctor creates holes in the vena cava, a significant vein in the stomach region, and the adjacent aorta to facilitate the passage of the tube with the replacement valve through the vein and then through the aorta to the heart. The patient may be able to remain awake during this procedure. This TAVR approach may benefit women, as they frequently possess smaller blood vessels than their male counterparts.

• Accessing the heart through the vessel beneath the clavicle or collarbone may be an option if the patient has undergone previous heart surgery or has an additional condition that complicates reaching other areas of the thorax.

• Transcarotid access is a technique by which the carotid artery in the neck is utilized to deliver the conduit to the heart. This procedure is uncommon but may be implemented when other alternatives prove inadequate.

• An additional uncommon location is through the septum, the tissue wall that divides the right and left atria of the heart. The doctor who guides the catheter through a blood vessel from the thigh to the heart locates the damaged valve.

What Are the Various Innovations in Transcatheter Surgery?

1. Transcatheter Heart Valve Replacement: Transcatheter heart valve (THV) intervention has significantly improved the results of individuals with valvular heart disease who are not eligible for surgery. Due to technological developments and improved competence, the criteria for performing these treatments have changed from being limited to patients with a very high risk to now including individuals with moderate or low risk. The effective use of transcatheter heart valve (THV) intervention for treating aortic stenosis in native valves, as well as the unsuccessful attempt to use THV in patients with failed bioprosthetic surgical valves (known as valve-in-valve THV) in the aortic, mitral, and pulmonary positions. The graphic displays the presently accessible transcatheter heart valve (THV) devices for various valve locations.

2. The Transcatheter Leadless Pacemaker System: It is a medical device used for cardiac pacing without the need for leads. The Micra transcatheter pacing system (TPS) is the smallest pacemaker in the world. It is inserted into the right ventricle using a minimally invasive procedure and does not need leads. This improves the patient's experience by minimizing scarring and reducing limitations after the implant. It also eliminates problems associated with the pocket, such as hemorrhage, infection, erosion, and concerns related to the lead, such as fracture, venous thrombosis, and infections. MICRA, when used with TAVR, demonstrates excellent compatibility for patients with aortic stenosis and heart block, as evidenced by the successful completion of India's first case under supervision.

3. Excimer Coronary Laser Atherectomy: Excimer coronary laser atherectomy is a secure and efficient method that can enhance clinical results when utilized alongside traditional methods in the proper circumstances. Currently, its main use is treating lesions that cannot be crossed or dilated using traditional balloons. The depth of laser penetration is directly proportional to its wavelength, meaning that a UV(ultra-violet) laser (which has a shorter wavelength) will have a lower penetration depth. Consequently, it will generate less heat and cause less unintended damage to surrounding tissue.

4. Percutaneous Mechanical Circulatory Support: Percutaneous mechanical circulatory support refers to a medical procedure involving mechanical devices to assist and support the functioning of the circulatory system through a minimally invasive approach. This procedure relies on using an Impella device, a compact catheter-based apparatus designed to help the ventricles. The procedure involves inserting the device into the left ventricle through the aortic valve utilizing a retrograde femoral artery approach. The device aids in sustaining systemic circulation by propelling blood from the left ventricle into the ascending aorta at a velocity ranging from 2.5 to 5.0 L/min (liters per minute). This aids in preserving systemic circulation while relieving the workload of the left ventricle. The typical indications include cardiogenic shock and assisting in difficult angioplasty procedures. The following case, the first reported case in the Asia Pacific region, illustrates the effective restoration of heart function in a patient with post-COVID-19 myocarditis and cardiogenic shock.

5. Left Atrial Appendage Occluder: A left atrial appendage occluder (LAAO) is a medical device that blocks the left atrial appendage. LAAO is presented as a substitute for anticoagulation in atrial fibrillation patients for whom it is not recommended due to contraindications. The following instance exemplifies the role of technology and equipment in managing intricate heart problems during the COVID-19 pandemic.

Conclusion

The advancements in heart valve replacement are a remarkable breakthrough in medicine. By increasing their research and technology, healthcare experts may now support patients with less risk and difficulties associated with the treatment. Nevertheless, much research must be conducted before these technological developments are implemented as substitutes for traditional techniques. Therefore, it is crucial to guarantee ongoing developments in contemporary medicine and implement innovative therapies as necessary.