Early invasive strategy in elderly patients with non-ST elevation acute coronary syndrome: comparison with younger patients regarding 30 day and long term outcome.

OBJECTIVES: To evaluate an early invasive strategy in elderly patients with non-ST elevation acute coronary syndrome (ACS). METHODS: All consecutive patients admitted with a diagnosis of non-ST elevation ACS from June 2002 to February 2004 were enrolled in this registry. Clinical outcome was assessed at 30 days and in long term follow up. RESULTS: An early invasive strategy was followed for 439 patients, of whom 159 (36%) were elderly and had a higher clinical risk profile and greater extent of coronary artery disease (CAD) than the younger patients. Coronary revascularisation was conducted in 133 (83%) elderly patients and 239 (85%) younger patients (not significant). At a mean (SD) follow up time of 10.7 (5.2) months overall mortality, cardiac death, and death plus myocardial infarction were significantly higher among elderly patients than among younger patients (9.4% v 2.1%, p < 0.001; 6.8% v 1.8%, p < 0.01; 11.3% v 5%, p = 0.02, respectively). The significant difference in cardiac death between the two groups was related more to elderly patients being treated by coronary artery bypass grafting (19.3% v 4.9%, p = 0.05) than by percutaneous coronary intervention (PCI) (2.9% v 1.1%, p = 0.3). Cox regression analysis showed age, serum creatinine > 115 micromol/l, no previous history of CAD, left ventricular ejection fraction > 45%, and the absence of diabetes to be independent predictors of the occurrence of major adverse cardiac events. CONCLUSIONS: In unselected elderly patients presenting with non-ST elevation ACS an early invasive strategy is feasible and leads to coronary revascularisation in the majority of cases, resulting in encouraging immediate and long term clinical results, particularly among PCI treated patients.

Clinical and angiographic outcome of directional atherectomy followed by stent implantation in de novo lesions located at the ostium of the left anterior descending coronary artery.

BACKGROUND: Lesions located at the ostium of the left anterior descending coronary artery (LAD) are considered an ideal target for directional atherectomy (DCA), but few data are available about the value of using this strategy before stenting in comparison with stenting alone. OBJECTIVES: To investigate the immediate and mid term clinical and angiographic results of DCA followed by stent implantation for ostial LAD lesions. DESIGN: Retrospective comparison of the immediate and mid term angiographic and clinical results of a series of 117 consecutive patients with de novo lesions located at the ostium of the LAD. Of these, 46 underwent DCA before stenting and 71 were treated with stenting alone. RESULTS: Technical success in the two groups was similar at around 98%. DCA plus stenting provided a larger minimum lumen diameter at the end of the procedure than stenting alone (3.57 (0.59) mm v 3.33 (0.49) mm, p = 0.022). There were no differences for in-hospital major adverse events (MACE) (7.5% for atherectomy plus stenting, and 5.3% for stenting alone; p = 0.41). All patients had clinical follow up at a mean of 7.9 (2.7) months. Angiographic follow up was done in 89 patients (76%) at a mean of 5.9 (2.2) months. The atherectomy plus stenting group had a larger minimum lumen diameter than the stenting group (2.79 (0.64) mm v 2.26 (0.85) mm, p = 0.004) and a lower binary restenosis rate (13.8% v 33.3%, p = 0.031). Six month MACE were reduced in the atherectomy plus stenting group (8.7% v 23.9%, p = 0.048). CONCLUSIONS: Debulking before stenting in de novo lesions located at the ostium of the LAD is safe and is associated with a high rate of technical success. Follow up data show that DCA plus stenting results in a significantly larger minimum lumen diameter and a lower incidence of restenosis than stenting alone.

Carotid artery stenting in the first 100 consecutive patients: results and follow up.

BACKGROUND: Carotid artery stenting is now used as an alternative to surgical endarterectomy. The availability of cerebral protection systems has expanded the area of application of this procedure. OBJECTIVE: To assess the feasibility, safety, and immediate and late clinical outcome in patients undergoing percutaneous carotid interventions. METHODS: Between January 1999 and December 2000, 100 consecutive patients with 102 carotid artery stenoses were treated (71 men, 29 women, mean (SD) age 67 (8) years): 49 had coronary artery disease, 28 had previous stroke or transient ischaemic attack (TIA). On the basis of the Mayo Clinic carotid endarterectomy risk scale, 73 patients were grade III-IV and 13 grade VI. RESULTS: Baseline diameter stenosis was 78.8 (10)%, with a mean lesion length of 12.6 (5.8) mm. Angiographic success was obtained in 99 lesions (97.0%) with a final diameter stenosis of 2.4 (3.5)%. Procedural success was obtained in 96 patients (96%). Selective cannulation of three carotid arteries was impossible owing to severe vessel tortuosity. Carotid stenting was performed in 97 of the treated lesions, and protection devices were used in 67 lesions. In-hospital complications occurred in seven patients (six TIA, one (category 1) minor stroke). No major stroke or death occurred. All patients were discharged from the hospital after an average of 2.5 days. At 12 (6.2) months of follow up restenosis occurred in three patients (3.4%) (one patient with carotid occlusion had TIA). Six patients had died: two from cerebrovascular events (5 and 11 months after the procedure) and four from cardiovascular causes. CONCLUSIONS: Carotid stenting appears feasible and safe, with few major complications. Long term follow up is affected by a high incidence of cardiovascular mortality.

Late acute thrombosis after coronary brachytherapy: when is the risk over?

Late total occlusion (LTO) after simultaneous coronary stenting and brachytherapy has been described in recent randomized trials. We report a case of LTO presenting with an acute clinical event 15 months after the index procedure, suggesting that the risk is not confined to the first 6-month to 1-year period.

Late acute thrombosis after paclitaxel eluting stent implantation.

Late (more than six months) total occlusion after coronary stenting is a progressive phenomenon occurring in approximately 4% of patients, leading to acute myocardial infarction in less than 0.5%. The process must be related to severe and progressive intimal hyperplasia. In patients receiving coronary stenting with simultaneous brachytherapy, late total occlusion has been reported at a higher rate and to be related to stent thrombosis rather than intimal hyperplasia. Late total occlusion presenting with an acute clinical event seven months after the implantation of a paclitaxel drug eluting stent is reported. The occlusion developed soon after the interruption of ticlopidine treatment, suggesting that the event had a thrombotic genesis and that the risk is not confined to the first six month period.

Surgical and percutaneous myocardial angiogenesis induction. Part II--neoangiogenesis.

Coronary artery bypass surgery and angioplasty provide symptomatic relief in patients with ischemic heart disease, but despite advancement in technique and devices, these methods are not applicable to a subset of patients with angina refractory to medical treatment. Bypass surgery might not be feasible because of lack of suitable conduits, diffuse coronary disease or poor distal run-off, and coronary angioplasty is sometimes not applicable due to chronic total occlusion, diffuse disease or extreme tortuosity. We have previously reviewed the available experience with laser-induced direct myocardial revascularization, one of the new potential treatment modalities for this patient subset. One of the potential mechanisms of action for laser treatment is the induction of neoangiogenesis. In the second part of our article we review the available experience with the induction of myocardial angiogenesis using different growth factors or the genes encoding for them.

Coronary pressure measurement to assess the hemodynamic significance of serial stenoses within one coronary artery: validation in humans.

BACKGROUND: When several stenoses are present within 1 coronary artery, the hemodynamic significance of each stenosis is influenced by the presence of the other(s), and the calculation of coronary and fractional flow reserve (CFR and FFR) for each individual stenosis is confounded. Recently, we developed and experimentally validated a method to determine the true FFR of each stenosis as it would be after the removal of the other stenosis; the true FFR can be reliably predicted by coronary pressures measured before treatment at specific locations within the coronary artery using equations accounting for stenosis interaction. The aim of the present study was to test the validity of these equations in humans. METHODS AND RESULTS: In this study of 32 patients with 2 serial stenoses in 1 coronary artery, relevant pressures were measured before the intervention, after the treatment of 1 stenosis, and after the treatment of both stenoses. The true FFR of each stenosis (FFR(true)) was directly measured after the elimination of the other stenosis and compared with the value predicted (FFR(pred)) from the initial pressure measurements before treatment. Although the hyperemic gradient across 1 stenosis increased significantly (from 10+/-7 to 19+/-11 mm Hg after treatment of the other stenosis), FFR(pred) was close to FFR(true) in all patients (0.78+/-0.12 versus 0.78+/-0.11 mm Hg; r=0.92; Delta%=4+/-0%). Without accounting for stenosis interaction, the value of FFR for each stenosis would have been significantly overestimated (0.85+/-0.08; P:<0.01). CONCLUSIONS: Coronary pressure measurements made by a pressure wire at maximum hyperemia provide a simple, practical method for assessing the individual hemodynamic significance of multiple stenoses within the same artery.

[Anatomico-functional changes in the right ventricle of the athlete]. / Modificazioni anatomo-funzionali del ventricolo destro nell'atleta.

The aim of this study was to compare the morpho-functional modifications of the right cardiac sections of the athlete's heart, with those of sedentary healthy control subjects. We studied 24 endurance athletes (mean age 28.17 +/- 7.28 years), 21 power athletes (mean age 25.86 +/- 4.96 years), and 20 sedentary healthy control subjects (mean age 33.22 +/- 6.67 years). We examined the right cavities by standard echocardiographic projections and the following parameters were evaluated: right ventricular longitudinal diameter; under tricuspid valve and medium ventricular transversal diameter immediately under the tricuspid plane and at medium ventricular level; right atrial transversal and longitudinal diameters. All parameters were corrected for body surface area. Our data showed that the right ventricle presents morphological adaptations to endurance exercise; modification is represented mainly by an increase in the mean transversal ventricular diameter with a consequent reduction in the transversal/longitudinal diameter ratio accompanied by modification of the ventricular geometry. In addition the data showed an increase in longitudinal and transversal diameters of the right atrium. On the contrary, the power athletes did not show statistical modification of the right ventricle and atrium. The different modifications of the right heart side diameter are probably due to the different hemodynamic loading, which is involved in the endurance and power training respectively.