ALTERNATIVE METHODS OF TREATMENT IN REFRACTORY ANGINA PECTORIS

ALTERNATIVE METHODS OF TREATMENT IN REFRACTORY ANGINA PECTORIS

Mihaela Rugina, Mihaela Salagean, S. Bubenek-Turconi, E. Apetrei, Maria Dorobantu

 

 

  1. Introduction
  2. Effort-induced angina refractory       to treatment  –  Options      of treatment
  3. Myocardial revascularization with extracorporeal      cardiac shock wave  therapy (ESWT).      Physiology and mechanism of action of extracorporeal      shock waves (ESW).
  4. Angiogenesis induced      by ESWT.
  5. Indications of ESWT.
  6. Treatment protocol of myocardial revascularization therapy with      ESWT
  7. Conclusions.
  1. 1.      INTRODUCTION

 

Coronary artery disease (CAD) is recognized as a leading cause of morbidity and mortality worldwide.

Current therapies for the treatment of CAD  include  medical treatment, percutaneous coronary angioplasty (PCI), coronary artery bypass graft surgery (CABG), transmyocardial laser revascularization (RLM), sympathectomy, external counterpulsation, spinal cord stimulation and  gene therapy. But these approaches are invasive and sometimes are not indicated for the treatment of advanced  refractory angina (RA)  and cardiovascular complications associated with these procedures are high.

The prognosis for patients with end stage CAD, without indications for CABG or PCI, is SEVERE. Using RLM demonstrated benefits in patients with diffuse coronary lesions.

However, RLM is used as an adjunctive therapy for CABG, if CABG fails to achieve a complete revascularization.

Alternative approaches such as gene therapy or stem cell transplantation are promising,    but still in preclinical stages, and both methods are equally  invasive.
It is important to note that exist a large number of patients with RA and these patiens continue  to present  arisk of sudden death (over  20%  of patients in  Courage Study and NHLBI Dynamic Registry) (1, 2). This was a reason to  introduce  a new technique, non- invasive treatment in RA -therapy with ESW- that can relieve angina by promoting angiogenesis and thus improve myocardial perfusion  and quality of life of patients with RA.

Vasculogenesis, angiogenesis, and arteriogenesis are processes that are  responsible  for  development and maintenance of the circulatory system. New vessel growth occurs in post-embryonic stage and it is  called „angiogenesis.” Angiogenesis is very important, not only during normal growth, but also in pathological situations (3). Certain pathological conditions such as neoplastic diseases are aggravated by excessive vessel growth (excessive angiogenesis), while in others conditions such  as CAD, lack of  adequate blood supply contributes to increased morbidity and mortality.

  1. 2.      EFFORT- INDUCED ANGINA REFRACTORY TO TREATMENT –  OPTIONS OF TREATMENT

 

Despite significant advances in revascularization techniques and medical therapy, there remains a significant population of patients who continue to have intractable angina symptoms which is defined as angina pectoris refractory (RA) to maximal medical therapy and coronary  revascularization procedures standard.

CAD with no therapy solution is defined „END STAGE” or ischemia  unresponsive to  „classic”  treatment and can be characterized by several clinical entities: angina pectoris „refractory” to maximal treatment, dilated ischemic  cardiomyopathy  with systolic  dysfunction   (EF-LV <30% )  with multiple  revascularization  procedures ( PCI  and / or  CABG)  or severe  comorbidities  limiting  cardiac treatment.  Thus, this group include elderly patients with an  increased  EUROSCORE without viable myocardium, with an anatomy which is not suitable for revascularization: distal lesions, diabetic patients with serious injuries, the presence of  pulmonary hypertension > 60 mmHg or contraindications for heart transplantation – defines patients with no  myocardial therapeutic solution.

Anatomical and functional definition of  CAD „END STAGE” includes  inducible  myocardial ischemia, refractory multivessel CAD  (> 2 vessels), and diffuse  injury  affecting mainly small vessels,  closed grafts, coronary anatomy unfavorable  for  PCI or CABG.
The prevalence of CAD „END STAGE” in a descriptive Study estimated by the  Cleveland Clinic  revealed a rate of 11.6% (59 of 500 patients) with coronary anatomy which is  not  favorable  for  a repeat of revascularization procedures, functional angina  pectoris class  >2,  inducible myocardial ischemia (26). In theU.S., 13.2 million patients have CAD  and of these it is estimated that approximately 0.8-2.4 million  patients with CAD  are not eligible for  CABG or PCI. Their number increases  with the combination of obesity, palliative treatment failure and disease progression (27).

In Europe, the prevalence of angina pectoris is about 20 – 40%, meaning 20-40 000  angina  cases  per million inhabitants, more than in North and East. Refractory angina occurs in  5-10%  of patients with stable angina, which is 3-7‰ of the population 45-75 years (28).  Indirect 9.6% of patients with angina sent to CABG were rejected, despite severe  symptoms  (Sweden,1994) and 5-15% of patients  had angina refractory  angiography  (Sweden 1998),  concluding  that about 30-50000 patients /year in Europehave RA.  In Romania, the average incidence is about 20%  higher than the U.S. in 2000, the estimated prevalence of RA  in Romania is 40 – 80‰, with a tendency to  decrease (29, 39).

Coronary revascularization reduces mortality only if there is viable myocardium (30).

Detection of myocardial viability can be determined by performing single-photon emission computed tomography imaging using thallium-201 chloride and/or technetium-99m labeled, PET (positron emission tomography using F18-fluorodeoxyglucose), resting cine MRI magnetic detection for myocardial scars (end-diastolic wall thickness <5 to 6 mm is a marker of transmural MI and excludes viability), electro-mechanical mapping, pharmacologic and echocardiography stress  at rest and with dobutamine to detect regional contractile activity.

Pentru mai multe detalii depre articol puteti contacta autorul la adresa de mail rugina.mihaela@gmail.com

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