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Romano, L.R.; Spaccarotella, C.A.M.; Indolfi, C.; Curcio, A. Revascularization and Left Ventricular Dysfunction for ICD Eligibility. Encyclopedia. Available online: https://encyclopedia.pub/entry/50594 (accessed on 01 August 2024).
Romano LR, Spaccarotella CAM, Indolfi C, Curcio A. Revascularization and Left Ventricular Dysfunction for ICD Eligibility. Encyclopedia. Available at: https://encyclopedia.pub/entry/50594. Accessed August 01, 2024.
Romano, Letizia Rosa, Carmen Anna Maria Spaccarotella, Ciro Indolfi, Antonio Curcio. "Revascularization and Left Ventricular Dysfunction for ICD Eligibility" Encyclopedia, https://encyclopedia.pub/entry/50594 (accessed August 01, 2024).
Romano, L.R., Spaccarotella, C.A.M., Indolfi, C., & Curcio, A. (2023, October 20). Revascularization and Left Ventricular Dysfunction for ICD Eligibility. In Encyclopedia. https://encyclopedia.pub/entry/50594
Romano, Letizia Rosa, et al. "Revascularization and Left Ventricular Dysfunction for ICD Eligibility." Encyclopedia. Web. 20 October, 2023.
Revascularization and Left Ventricular Dysfunction for ICD Eligibility
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This entry is adapted from the peer-reviewed paper 10.3390/life13091940

Common triggers for sudden cardiac death (SCD) are transient ischemia, hemodynamic fluctuations, neurocardiovascular influences, and environmental factors. SCD occurs rapidly when sinus rhythm degenerates into ventricular tachycardia (VT) and/or ventricular fibrillation (VF), followed by asystole. Such progressive worsening of the cardiac rhythm is in most cases observed in the setting of ischemic heart disease and often associated with advanced left ventricular (LV) impairment. Revascularization prevents negative outcomes including SCD and heart failure (HF) due to LV dysfunction (LVD). The implantable cardioverter–defibrillator (ICD) on top of medical therapy is superior to antiarrhythmic drugs for patients with LVD and VT/VF. The beneficial effects of ICD have been demonstrated in primary prevention of SCD as well.

revascularization heart failure cardiac dysfunction implantable cardioverter–defibrillator ischemic cardiomyopathy

1. Introduction

Left ventricular dysfunction (LVD) is associated with considerable morbidity and mortality and currently represents the most common cause of heart failure (HF) in the developed world. While revascularization through either percutaneous coronary interventions (PCI) or coronary artery bypass graft (CABG) has reached notable advances in the treatment of patients with acute (ACS) and chronic coronary syndromes (CCS) by drastically reducing the acute mortality, an inevitable increase in the prevalence of LVD is observed daily. This has led to the identification of a clinical illness, named ischemic cardiomyopathy (ICM) that is characterized by severe coronary artery disease including at least one of the following features: prior revascularization or acute myocardial infarction (AMI); >75% stenosis in the left main stem or the left anterior descending artery; two or more coronary vessels with >75% luminal stenosis.
New devices in the cath lab, such as drug-eluting stents, have been proven superior to obsolete thrombolytic therapy, and more contemporary surgical techniques are associated with improved survival in ICM.
However, among AMI patients, 25–35% will die of sudden cardiac death (SCD) before receiving medical attention, most often from life-threatening tachyarrhythmias such as ventricular tachycardia (VT) and/or ventricular fibrillation (VF) [1][2][3]. While acute in-hospital management of ventricular tachycardia (VT)/ventricular fibrillation (VF) is obtained through electrical cardioversion and antiarrhythmic drugs [4][5][6][7], the need for an implantable cardioverter–defibrillator (ICD) in secondary prevention is recommended [8][9][10][11], as well as in primary prevention for patients at risk of malignant ventricular arrhythmias that occur late after discharge.
The evidence is conflicting regarding the association of revascularization and recurrent VT/VF in patients with ICM, with some trials [12] and guidelines [1][13] reporting beneficial association and others reporting no association [14][15][16]. In fact, some patients do not qualify for an ICD according to current guidelines, due to the results of two studies [15][17], which did not show any benefits of early (<40 days after a MI) ICD implantation [16][17][18][19]. New indications are available to guide implantation of an ICD through invasive electrophysiological study (PES) for patients with recent MI developing syncope or non-sustained VT, and for patients with indication for a permanent pacemaker due to bradyarrhythmias following MI, who also meet primary prevention criteria for SCD [13][14][15].
On the other hand, the DAPA trial demonstrated that ICD reduces the risk of all-cause mortality at 10 years after implant in patients who suffered a MI [20] and larger studies are ongoing [21].
In light of the above reported considerations, the main goal of treatment for patients dramatically experiencing either ACS or CCS is represented by revascularization, timely performed by PCI (or thrombolysis if PCI is unfeasible) or CABG in cases of symptoms refractory to medical therapy, hemodynamic instability, left main or triple vessel disease, complex coronary anatomy not suitable for PCI, ongoing ischemia despite attempts at PCI or failed PCI [22][23], followed by close clinical re-assessments for establishing ICD indication.

2. Pathophysiologic Benefits of Revascularization

The pathophysiologic substrate of ICM spans from metabolic to neurohumoral and inflammatory changes resulting in an adverse myocardial remodeling and contractile dysfunction in the context of significantly impaired myocardial blood flow and/or reduced coronary flow reserve. Following MI, the onset of myocardial ischemia triggers cellular injury and death, which activate an inflammatory response through inflammasomes, complement activation, and reactive oxygen species production.
Even in the context of successful mechanical revascularization and blood flow restoration in epicardial vessels after AMI, approximately 50% patients do not achieve optimal myocardial reperfusion. The so called no-reflow phenomenon is mainly attributed to coronary microvascular dysfunction that includes impaired vasomotor function, extensive microvascular injury with microvascular obstruction, inflammation and hemorrhage following AMI and reperfusion therapy. Furthermore, the ischemic myocardium undergoes structural and functional remodeling due to stunned and hibernating states [24]. Stunning is referred to the myocardium that is transiently ischemic and displays contractile dysfunction, which ultimately recovers early after restoration of normal resting blood flow. In the context of hibernating myocardium resting blood flow is severely reduced, while cardiac tissue remains viable by adaptively reducing contractility and cellular activity to decrease basal metabolic requests [25]. In contrast to stunned myocardium, hibernating myocardium usually recovers late after revascularization [26].
However, not all viable myocardium recovers after revascularization and the probability of recovery and reverse remodeling is affected by several factors including the timeliness, completeness, and long-term patency of revascularization. Prolonged myocardial hibernation may progress to necrosis, limiting functional recovery after revascularization. Extent of viability is also important, and several studies have shown that at least 25% to 30% of dysfunctional myocardium needs to be viable for improvement in LVEF after revascularization, with the except of extensively remodeled and dilated ventricles which could not recover after revascularization even in the presence of viable areas [24][25][26].
Indeed, in the environment of successful mechanical revascularization, previous studies have suggested that low operator and institutional procedures’ volume may be associated with a higher risk of adverse events regarding PCI [27]. The American guidelines and the Society for Cardiovascular Angiography and Intervention [28] recommend that at least 50 coronary interventions must be performed per year (an average of two years) to maintain competency (level of evidence C).
Once severe myocardial damage occurs, acute ischemia must be treated as early as possible, and optimal medical therapy (OMT) should significantly reduce morbidity and mortality. [29]. Recently, European guidelines have introduced important innovations on the topic. Specifically, in HF with reduced EF, OMT is based on four basic pillars: angiotensin-converting enzyme inhibitor/type 1—angiotensin II receptor blockers or Sacubitril/Valsartan; sodium-glucose cotransporter-2 inhibitors; beta-adrenergic receptor blockers and mineralocorticoid receptor antagonists. These drugs are strongly recommended to reduce the risk of hospitalization and death [15][30]. 

3. Percutaneous Revascularization and ICD Implantation

In the context of a German registry, the beneficial effects of revascularization, mainly percutaneous (74%), have been addressed by serial echocardiography aimed at LVEF quantification 441 ± 220 days following MI. Although a significant increase (more than 6%) was observed, the study shows that several echocardiographic assessments are required before establishing and indication to ICD, in part because of high interindividual as well as intraindividual variability, but mostly because recovery might be delayed by the extension of scar with variable response to therapies and interventions [31].
The REVIVED-BCIS2 prospective, multicenter, open-label, randomized controlled trial [22][32], was originally created for impacting on both revascularization and HF guidelines by demonstrating the role of PCI in the setting of ICM. While the study was designed to address optimal medical therapy alone or in combination with PCI in 700 patients with ICM and viable myocardium, it appeared that in a 3.4 years median of observation, quality of life and cardiac function improved similarly in both groups.
The final superiority data in terms of ICD discharges and lifesaving delivered electrical therapies came from an American registry [33], conducted in consecutive patients hospitalized for MI. More than 11,000 patients, mainly undergone PCI (86%) received in 10% cases an ICD in primary prevention of SCD within 1 year of revascularization. Surprisingly, compared with not implanted patients, those who received an ICD were younger males, and such approach was associated with significantly lower 2-year mortality among revascularized MI patients, mostly upon PCI.

4. Surgical Revascularization and ICD Implantation

Surgical revascularization has recently been shown to improve long-term outcomes, although the open-chest approach is associated with increased early hazard [34]. A network meta-analysis [35] of on-pump cardioplegic arrest, off-pump, and on-pump beating heart strategies, demonstrated a superiority of the last two approaches in terms of 30-day mortality; such conclusions indicated that critically ill subjects may benefit most from avoiding further myocardial injury associated with cardiopulmonary bypass and cardioplegic arrest. After excluding re-exploration for bleeding or tamponade, patients affected by ICM undergoing CABG surgery show continuous recovery from LVD in the first post-operative year [36][37]. The STICH trial [18] found the highest risk of SCD in the first and in the third months after surgical revascularization in HF patients. Notwithstanding such results, ICD after CABG remains a critical path for patients, physicians, and payers; in fact, yet need for prevention with ICD implantation remains debated due to mortality related to other factors which negatively influence Medicare centers and insurance companies for hospital reimbursement [38][39].

5. ICD Implantation in Ischemic Untreated LVD

Current evidence-based therapy for patients suffering from ICM aims to optimize cardiovascular function, prevent progressive remodeling, reduce HF symptoms and hospitalization, and improve survival. In addition to ICD, CRT and the use of percutaneous device for curing valvular abnormalities such as mitral regurgitation, are recommended treatments when quadruple therapy is already initiated and quintuple therapy by adding vericiguat is considered [40][41][42][43][44][45][46].
Takano and coworkers [47] investigated the impact of complete vs. partial revascularization on cardiac dimension and function. The authors studied 56 patients, with more than 80% of cases in which the incompletely revascularized arteries were affecting the LV performance. They observed that significantly greater LV end-diastolic diameter, lower LVEF, and higher prevalence of incomplete revascularization were independent predictors of recurrent VT/VF and appropriate intervention by the implanted ICD compared to other ICD recipients with coronary artery disease and complete revascularization.

6. Impact of COVID-19 Pandemic on Treatment Delay and ICD Implantation

The Coronavirus disease of 2019 (COVID-19), caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), was declared by the World Health Organization (WHO) on 11 March 2020, was declared a pandemic, and it resulted in a public health crisis of global proportions [48].
In this period, the access to medical care was strongly limited and resulted in a higher rate of medical discontinuation. Additionally, a decline in the emergency department visits and an increase in out-of-hospital CV mortality have been reported. Reorganization of hospitals, focused primarily on managing COVID, was necessary and may lead to neglect of other diseases. To preserve resources, including personal protective equipment and hospital beds to treat COVID-19 patients, the Centers for Disease Control and Prevention has recommended postponing elective cardiac procedures, including coronary angiography and percutaneous coronary intervention, in patients with stable coronary artery disease.
COVID-19 had also a significant influence on cardiac arrhythmia care, resulting in a greater than 50% decrease in all types of operations [49]. The time from symptoms to the first medical contact was shorter for arrhythmic emergencies requiring a device implant, but the time from the initial medical contact to the procedure was much longer. The number of elective pacemaker (PM), ICD, and CRT devices implantations decreased by 40% compared to 2019 and by 70% for ablations during the first wave. Subsequent waves typically saw a slow return to pre-pandemic levels for ablations. Recovery after the initial 10% reduction for emergency procedures (PM, ICD, CRT, and ablations) happened usually during the second wave, with some variation [50][51].

7. Emerging Technologies for Short- and Long-Term Management of SCD Risk in Ischemic Cardiomyopathy

The frontiers in SCD prevention are directed toward expanding indications while reducing risks, which both are related to the role of ICD in the young patients, as well as in the acute setting. Younger subjects are exposed to a potential risk over the longer follow-up compared to middle-aged patients, since they will undergo several generator replacements. The subcutaneous ICD (S-ICD), besides its wide adoption in the above-described setting [52], is a valid therapy also in ICM, since it does not enter the thorax or pleural space, and therefore limits the risk of bleeding that derives from vein access, and pocket hematoma. As S-ICD is highly reliable in detecting and treating VT/VF by using a shock-lead that is located subcutaneously above the sternum, the increased reliability of the surface leads is encountered also in the wearable cardioverter–defibrillator (WCD)
Currently, such technology is offered to patients at high risk for SCD not fulfilling criteria for ICD implantation, mainly because close temporal relationship with either MI or revascularization [53][54][55][56][57]. While the WEARIT and BIROAD studies [58][59] addressed the feasibility of VT/VF detection and treatment by using the WCD, the WEARIT II [60] and the recent VEST trials [61] provided conflicting results in terms of safely and effectively preventing SCD in the first period after MI in patients with LVD.

8. Conclusions

A full restoration of cardiac function back to the frame preceding the acute MI is improbable to obtain. Although complete revascularization is mandatory for positive ventricular remodeling and reduction in arrhythmic burden, the actual recovery is modest in patients with either severely reduced LVEF or with moderate reduction. Stunned and hibernated myocardium are the clinical scenarios that benefit the most from revascularization. On the other hand, recently introduced “pillars” of heart failure therapy, when initiated timely, contribute dramatically to the outcomes of HF patients.
While ICD has demonstrated a superiority in terms of lives saved [62][63], it is also important to assess whether revascularization, obtained either through PCI or CABG, is complete in order to achieve improved cardiac performances and outcome, similarly to reduction in fatal arrhythmias in the ischemic and post-ischemic settings. The role of revascularization yet remains controversial, mostly due to the selected approach based either on optimal medical therapy alone or in combination with routine angiography and revascularization [64][65].
Amelioration in LVEF due to medical therapy, revascularization, CRT, and transcatheter edge-to-edge repair of the mitral regurgitation could lead to improvement in prognosis and may modify the association of myocardial scar and ischemia-related outcomes [66][67].
Finally, remote monitoring has also shown a reduction in severe outcomes when applied to loop recorders inserted in ischemic patients [68], as well as in HF patients implanted with ICD for reducing inappropriate shocks [69].

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Subjects: Cardiac & Cardiovascular Systems
Contributors MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
Letizia Rosa Romano
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Carmen Anna Maria Spaccarotella
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Ciro Indolfi
,
Antonio Curcio
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Update Date: 23 Oct 2023
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