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1.
J Am Coll Cardiol ; 22(7): 1887-91, 1993 Dec.
Article in English | MEDLINE | ID: mdl-8245344

ABSTRACT

OBJECTIVES: The purpose of this study was to determine the immediate and long-term angiographic and clinical results of coronary stenting as a specific therapy for intracoronary dissection associated with acute or threatened closure complicating percutaneous transluminal coronary angioplasty. BACKGROUND: Published reports contain conflicting results with regard to the benefit of stent insertion for coronary dissection. In particular, there is a wide range in the reported rates of subacute occlusion. METHODS: Palmaz-Schatz stents were inserted in 56 patients who had significant dissections and acute or threatened closure complicating coronary angioplasty. An attempt was made to cover the entire site of the dissection with short or standard single or multiple Palmaz-Schatz stents. The use of the short stent allowed complete coverage of the dissection, specifically in situations such as marked vessel tortuosity or the need to place a stent distal to a deployed stent. RESULTS: A single stent was implanted in 24 patients and multiple stents were implanted in 32 patients. A total of 138 stents (78 standard, 60 short stents) were implanted. The primary clinical success rate was 88% (49 of 56 patients). Complications occurred in seven patients (12.5%): Three patients (5%) required urgent bypass surgery; two patients (4%) had a myocardial infarction; and two patients (4%) died. Subacute occlusion occurred in one patient (2%). Clinical follow-up was available in all patients at a mean of 10 +/- 4 months. Thirty-nine (80%) of 49 patients were clinically asymptomatic. Angiographic restenosis was found in 15 (36%) of 42 patients on angiographic follow-up performed a mean of 5 months (median 6) after the procedure in 86% of the eligible patients. Nine patients had successful repeat angioplasty, and two had elective bypass surgery. CONCLUSIONS: The strategy of coronary stenting to completely cover the lesion is an effective treatment for large coronary dissection complicating angioplasty. A total major complication rate of 12.5% may be acceptable for this high risk group.


Subject(s)
Angioplasty, Balloon, Coronary/adverse effects , Coronary Disease/therapy , Coronary Vessels/injuries , Stents , Coronary Angiography , Coronary Disease/diagnostic imaging , Coronary Disease/epidemiology , Female , Follow-Up Studies , Humans , Male , Middle Aged , Recurrence , Time Factors
2.
J Am Coll Cardiol ; 26(3): 713-9, 1995 Sep.
Article in English | MEDLINE | ID: mdl-7642864

ABSTRACT

OBJECTIVES: This retrospective analysis was performed to assess the medium-term effectiveness of implanting intracoronary stents into chronic total occlusions that are successfully opened by balloon angioplasty. BACKGROUND: The value of percutaneous transluminal coronary angioplasty of chronic total occlusions is limited by a very high restenosis rate of 50% to 68%. Intravascular stents have been shown to reduce restenosis in a subset of patients with subtotal stenoses. It has not been demonstrated that the placement of stents into successfully opened chronic total coronary artery occlusions leads to lower rates of restenosis. METHODS: A consecutive series of patients with chronic total coronary occlusions successfully opened by balloon angioplasty received Palmaz-Schatz stents. Patients underwent clinical and angiographic follow-up at a mean of 6 months after stent insertion. Angiographic and clinical results were retrospectively analyzed. RESULTS: Fifty-nine patients underwent stenting of 60 chronic total coronary occlusions, with a 98% rate of successful stent deployment. Complications occurred in 5% of cases, all with subacute thrombosis. Angiographic follow-up was obtained in 88% of patients at a mean of 6 months and demonstrated an angiographic restenosis rate of 20%, with only one reocclusion. Among several variables examined, only the presence of a procedure-related moderate to severe dissection was associated with higher follow-up percent diameter stenoses and clinical events. At a mean of 14 months after stent insertion, 77% of patients remained free of symptoms or clinical events. CONCLUSIONS: The implantation of intracoronary stents into vessels with opened chronic total coronary occlusions is associated with favorable rates of angiographic restenosis and relief of symptoms. A randomized clinical trial comparing balloon angioplasty with stent-assisted balloon angioplasty in the treatment of chronic total coronary occlusions is indicated.


Subject(s)
Angioplasty, Balloon, Coronary , Coronary Disease/therapy , Coronary Vessels , Stents , Aged , Analysis of Variance , Angioplasty, Balloon, Coronary/methods , Chronic Disease , Coronary Angiography , Coronary Disease/diagnostic imaging , Coronary Vessels/diagnostic imaging , Female , Follow-Up Studies , Humans , Linear Models , Logistic Models , Male , Middle Aged , Recurrence , Retrospective Studies , Stents/adverse effects , Stents/statistics & numerical data , Time Factors , Ultrasonography, Interventional
3.
J Am Coll Cardiol ; 24(4): 996-1003, 1994 Oct.
Article in English | MEDLINE | ID: mdl-7930236

ABSTRACT

OBJECTIVES: This study was designed to evaluate the changes in intrastent and angiographic dimensions when intravascular ultrasound imaging is used to direct the deployment of balloon-expandable Palmaz-Schatz stents in coronary arteries and saphenous vein grafts. BACKGROUND: Intravascular ultrasound provides more information than angiography in the imaging of intravascular structures. Previous studies have shown that obtaining a larger lumen (greater "acute gain") with coronary interventions such as stenting leads to less restenosis and subacute thrombosis. It is not clear whether the information obtained by intravascular ultrasound can be used to obtain a greater acute gain in lumen dimensions. METHODS: Forty consecutive patients undergoing Palmaz-Schatz stent implantation had intravascular ultrasound imaging performed after a good angiographic appearance was obtained. If the stent did not appear adequately expanded by intravascular ultrasound, or if the struts were poorly apposed to the arterial wall, further stent dilation with larger balloons or higher pressure inflations were performed. Twenty-nine patients had subsequent intravascular ultrasound imaging. Intrastent diameters and areas were compared from the initial to the final intravascular ultrasound studies. RESULTS: Of the 40 patients studied, only 5 (13%) had an adequate result by intravascular ultrasound despite an acceptable angiographic appearance in all patients. Six additional patients did not undergo subsequent intravascular ultrasound imaging. The other 29 patients all demonstrated a significant increase in intrastent minimal diameter (mean 19%), major diameter (11%) and cross-sectional area (34%) (p < 0.001 for all measurements). CONCLUSIONS: The use of intravascular ultrasound imaging in the deployment of balloon-expandable Palmaz-Schatz stents leads to a significant increase in intrastent dimensions (greater "acute gain").


Subject(s)
Coronary Vessels/diagnostic imaging , Stents , Ultrasonography, Interventional , Aged , Analysis of Variance , Catheterization , Constriction, Pathologic/diagnostic imaging , Constriction, Pathologic/therapy , Coronary Angiography , Coronary Disease/diagnostic imaging , Coronary Disease/therapy , Female , Humans , Male , Middle Aged , Retrospective Studies
4.
J Am Coll Cardiol ; 17(6 Suppl B): 160B-168B, 1991 May.
Article in English | MEDLINE | ID: mdl-2016474

ABSTRACT

Arterial wall perforation and chronic restenosis represent important factors limiting the clinical application of laser angioplasty. Discrimination of normal and atherosclerotic vessels by laser-excited fluorescence spectroscopy may offer a means of targeting plaque ablation, thereby reducing the frequency of restenosis and transmural perforation. In this study, with use of a 325 nm low power helium-cadmium laser, in vivo endogenous surface fluorescence was excited through a flexible 200 microns optical fiber within a 0.018 in. (0.046 cm) guide wire in contact with the intima of 268 vascular interrogation sites from 48 patients either during open heart surgery or during percutaneous catheterization procedures. Fluorescence spectra could be recorded in all patients in bloodless and blood-filled arteries. Endogenous surface fluorescence was analyzed measuring peak intensity, peak position and shape index of the spectra. Compared with normal wall, noncalcified and calcified coronary atheroma showed a 42% (p less than 0.001) and a 58% (p less than 0.001) decrease of peak intensity, and higher shape index (p less than 0.001 and p less than 0.01, respectively). In addition, peak position was shifted to longer wavelengths for noncalcified coronary atheroma (p less than 0.001). Compared with normal aorta sites, aortic plaques demonstrated a 46% decrease of peak intensity, longer peak position wavelengths (p less than 0.05) and a higher shape index (p less than 0.001). Using an atheroma detection algorithm, prospective analysis of aorta and coronary spectra showed a specificity of 100% for identifying normal sites and a sensitivity of 73% for recognizing atherosclerotic sites.(ABSTRACT TRUNCATED AT 250 WORDS)


Subject(s)
Arteriosclerosis/diagnosis , Lasers , Spectrometry, Fluorescence/methods , Adolescent , Adult , Aged , Algorithms , Evaluation Studies as Topic , Female , Humans , Male , Middle Aged , Prospective Studies , Spectrometry, Fluorescence/instrumentation
5.
J Am Coll Cardiol ; 16(5): 1310-4, 1990 Nov.
Article in English | MEDLINE | ID: mdl-2229780

ABSTRACT

Although valved conduits have been used successfully in severe forms of right ventricular-pulmonary artery discontinuity, progressive valved conduit stenosis is an important clinical problem. To determine the feasibility of reducing right heart valved conduit stenosis with a balloon expandable stent, a baboon model was used, in which the pulmonary artery was ligated and a right ventricular to pulmonary artery 14 mm bioprosthetic Dacron valved conduit implanted. In five baboons, at an average of 40 months after valved conduit implantation, fibrointimal stenosis at the valve site resulted in narrowing and a mean transconduit pressure gradient of 49 mm Hg (range 33 to 65). A tubular slotted steel stent (1.2 cm long) was deployed within the valved conduit after inflation of an 8 to 15 mm diameter balloon catheter that was introduced through the femoral vein. A stent was delivered to all valved conduits; however, in two baboons, balloon undersizing resulted in stent dislodgment. In the remaining three baboons, the transconduit gradient was reduced by 59% (49 to 20 mm Hg) and right ventricular systolic pressure decreased acutely by 35% (77 to 50 mm Hg). It is concluded that stent deployment is feasible in right ventricular to pulmonary artery stenotic valved conduits and may result in significant hemodynamic improvement. However, successful stent delivery is critically dependent on the proper selection of stent length and balloon diameter.


Subject(s)
Blood Vessel Prosthesis , Catheterization , Graft Occlusion, Vascular/therapy , Stents , Animals , Constriction, Pathologic/therapy , Heart Ventricles/surgery , Papio , Pulmonary Artery/surgery
6.
J Am Coll Cardiol ; 9(3): 608-14, 1987 Mar.
Article in English | MEDLINE | ID: mdl-2950155

ABSTRACT

Sixteen patients with acute myocardial infarction underwent treatment with streptokinase up to 3 hours after the onset of chest pain. Nine patients (group I) received streptokinase within 1 hour of the onset of pain, and seven patients (group II) received it within 2 to 3 hours. All underwent multigated radionuclide ventriculography after streptokinase therapy and 1 week later. Percutaneous transluminal coronary angioplasty of the infarct artery was performed within 24 hours in all patients. An effort-limited treadmill stress test was performed before discharge. There was no mortality or serious complication. Mean peak total creatine kinase was 521 +/- 289 mU/ml in group I, and 1,614 +/- 709 mU/ml in group II (p less than 0.05). The mean initial left ventricular ejection fraction was 47 +/- 11% in group I and 37 +/- 10% in group II. After early angioplasty (within 24 hours) and at 1 week recovery, left ventricular ejection fraction increased to 53 +/- 9% in group I (p less than 0.05) and to 40 +/- 7% in group II (p = NS). Seven of the nine patients in group I had normal radionuclide ventriculograms at discharge compared with none of the seven patients in group II. Thrombolytic therapy administered less than 1 hour after the onset of symptoms of acute myocardial infarction followed by angioplasty of the infarct artery results in preservation of left ventricular function, whereas therapy given after 2 hours has only a limited effect.


Subject(s)
Angioplasty, Balloon , Myocardial Infarction/drug therapy , Streptokinase/therapeutic use , Adult , Aged , Cardiac Catheterization , Electrocardiography , Exercise Test , Humans , Injections, Intravenous , Middle Aged , Myocardial Infarction/enzymology , Myocardial Infarction/physiopathology , Myocardial Infarction/surgery , Radionuclide Imaging , Time Factors
7.
J Am Coll Cardiol ; 30(4): 847-54, 1997 Oct.
Article in English | MEDLINE | ID: mdl-9316508

ABSTRACT

OBJECTIVES: The purpose of this study was to determine the feasibility, safety and efficacy of elective and urgent deployment of the new intravascular rigid-flex (NIR) stent in patients with coronary artery disease. BACKGROUND: Stent implantation has been shown to be effective in the treatment of focal, new coronary stenoses and in restoring coronary flow after coronary dissection and abrupt vessel closure. However, currently available stents either lack flexibility, hindering navigation through tortuous arteries, or lack axial strength, resulting in suboptimal scaffolding of the vessel. The unique transforming multicellular design of the NIR stent appears to provide both longitudinal flexibility and radial strength. METHODS: NIR stent implantation was attempted in 255 patients (341 lesions) enrolled prospectively in a multicenter international registry from December 1995 through March 1996. Nine-, 16- and 32-mm long NIR stents were manually crimped onto coronary balloons and deployed in native coronary (94%) and saphenous vein graft (6%) lesions. Seventy-four percent of patients underwent elective stenting for primary or restenotic lesions, 21% for a suboptimal angioplasty result and 5% for threatened or abrupt vessel closure. Fifty-two percent of patients presented with unstable angina, 48% had a previous myocardial infarction, and 45% had multivessel disease. Coronary lesions were frequently complex, occurring in relatively small arteries (mean [+/-SD] reference diameter 2.8 +/- 0.6 mm). Patients were followed up for 6 months for the occurrence of major adverse cardiovascular events. RESULTS: Stent deployment was accomplished in 98% of lesions. Mean minimal lumen diameter increased by 1.51 +/- 0.51 mm (from 1.09 +/- 0.43 mm before to 2.60 +/- 0.50 mm after the procedure). Mean percent diameter stenosis decreased from 61 +/- 13% before to 17 +/- 7% after intervention. A successful interventional procedure with < 50% diameter stenosis of all treatment site lesions and no major adverse cardiac events within 30 days occurred in 95% of patients. Event-free survival at 6 months was 82%. Ninety-four percent of surviving patients were either asymptomatic or had mild stable angina at 6 month follow-up. CONCLUSIONS: Despite unfavorable clinical and angiographic characteristics of the majority of patients enrolled, the acute angiographic results and early clinical outcome after NIR stent deployment were very promising. A prospective, randomized trial comparing the NIR stent with other currently available stents appears warranted.


Subject(s)
Angioplasty, Balloon, Coronary/instrumentation , Coronary Disease/therapy , Stents/standards , Aged , Coronary Angiography , Coronary Disease/diagnostic imaging , Disease-Free Survival , Elective Surgical Procedures , Emergencies , Equipment Design , Feasibility Studies , Female , Humans , Male , Middle Aged , Prospective Studies , Recurrence , Stents/adverse effects
8.
Chest ; 105(3): 733-40, 1994 Mar.
Article in English | MEDLINE | ID: mdl-8131534

ABSTRACT

To assess the effects of coronary angioplasty in patients with severe left ventricular dysfunction, the results of procedures, performed between 1987 and 1991, in 100 patients (90 male) with left ventricular function < or = 0.35 (range, 0.20 to 0.35) and anginal symptoms were analyzed. Mean age was 62 +/- 10 years (range, 38 to 85 years). Ninety-five patients had previous myocardial infarction and 27 patients had previous coronary artery bypass grafting. Unstable angina was present in 81 percent of patients. Single-vessel disease was present in 6 patients, double vessel was present in 31 patients, and triple-vessel disease was present in 63 patients. Percutaneous transluminal coronary angioplasty (PTCA) was attempted on 164 vessels, 27 of these with chronic total occlusion. The overall angiographic success rate was 84 percent. Myocardial infarction occurred in four patients, six patients underwent urgent coronary bypass surgery, and seven patients died of cardiac causes. There was a 9 percent incidence of total in hospital mortality. Major complications were significantly more frequent in patients with triple-vessel disease. Clinical success was achieved in 75 patients, 55 of these with incomplete revascularization. Long-term follow-up (mean, 19 +/- 7 months) was available in all patients with clinical success. Thirteen patients had repeated PTCA, 8 patients had coronary surgery, and 13 patients died. In conclusion, in patients with severe left ventricular dysfunction, acute complications and late mortality rate are high. Patients with triple-vessel disease are a higher risk subset and have no long-term benefits by PTCA.


Subject(s)
Angioplasty, Balloon, Coronary/mortality , Coronary Disease/therapy , Ventricular Function, Left/physiology , Coronary Angiography , Coronary Disease/mortality , Female , Follow-Up Studies , Hospital Mortality , Humans , Intra-Aortic Balloon Pumping , Male , Middle Aged , Retrospective Studies , Risk Factors , Stents , Survival Rate , Time Factors , Treatment Outcome
9.
Heart ; 79(3): 234-41, 1998 Mar.
Article in English | MEDLINE | ID: mdl-9602655

ABSTRACT

OBJECTIVE: To assess the clinical and angiographic results of the first clinical application of a new balloon expandable stent, the NIR stent, characterised by high longitudinal flexibility and low profile before expansion, and by high radial support and minimal recoil and shortening after expansion. DESIGN: Single centre survey of unselected lesions in consecutive patients. SETTING: Tertiary referral centre. PATIENTS AND LESIONS: 93 stents of various length (9, 16, and 32 mm) were implanted in 64 lesions in 41 patients. Twenty lesions (31%) were longer than 15 mm, and 17 lesions (27%) were located in vessels with a diameter smaller than 2.5 mm. Extreme tortuosity of the proximal vessel was present in 15 lesions (23%). All patients were treated with aspirin and ticlopidine. All lesions were evaluated before and after treatment by quantitative angiography, and in 47 lesions (75%) the stent expansion was also controlled by intracoronary ultrasound. Clinical follow up was available in all patients and angiographic follow up was performed in 53 lesions (84%), at a mean (SD) interval of 5.4 (1.7) months. RESULTS: Deployment of the stent failed in two lesions (3%). Minimum lumen diameter increased from 1.01 (0.54) mm to 2.94 (0.49) mm, and diameter stenosis decreased from 66(15)% to 7(11)%. There was one in-hospital non-Q wave myocardial infarction, one sudden death after 40 days, and 17 target lesion revascularisations (27%). Angiographic restenosis (> or = 50% diameter stenosis) was documented in 19 lesions (36% of all lesions with angiographic follow up), with an average residual diameter stenosis of 43(21)% and minimum lumen diameter of 1.63 (0.74) mm. Restenosis was more common in vessels with a reference diameter < 2.5 mm (45%) and for lesions longer than 15 mm (46%). CONCLUSIONS: The NIR stent could be used successfully in most lesions, achieving optimal angiographic results with very few in-hospital or subacute cardiac events. The angiographic restenosis rate and need for target lesion revascularisation remained high in this unfavourable lesion subset, especially in small vessels and long lesions.


Subject(s)
Coronary Disease/surgery , Stents , Catheterization , Coronary Angiography , Female , Follow-Up Studies , Humans , Male , Middle Aged , Treatment Outcome
10.
Am J Surg ; 158(2): 142-5, 1989 Aug.
Article in English | MEDLINE | ID: mdl-2667386

ABSTRACT

Increasingly complex vascular reconstructions and emerging endovascular therapeutic modalities have stimulated the need for improved vascular imaging. To determine the feasibility of in vivo intravascular ultrasound, a miniature probe 1 mm in diameter with a 25 MHz center frequency was used to obtain two-dimensional, 360-degree cross-sectional images. In sheep, 14 superficial femoral arteries were imaged at different sites, and a portion of each vessel was resected for immediate in vitro imaging and histologic examination. In vivo images clearly showed the intima, media, and adventitia of the vessel wall as well as the lumen-intima and media-adventitia interfaces. There was a significant correlation in measured lumen area between resected artery ultrasound images and histologic sections. We conclude that intravascular ultrasound can produce high-resolution dynamic images that demonstrate vessel wall architecture and allow precise calculation of lumen area.


Subject(s)
Femoral Artery/anatomy & histology , Ultrasonography , Animals , Feasibility Studies , Sheep
11.
J Invasive Cardiol ; 7 Suppl A: 12A-22A, 1995.
Article in English | MEDLINE | ID: mdl-10155111

ABSTRACT

Intracoronary stents can be implanted with a low incidence of stent thrombosis (< 1%) when the stent procedure is guided by intravascular ultrasound. The long-term clinical and angiographic effects, however, have not been reported. This study assesses the 6 month clinical and angiographic results of a consecutive series of patients with intravascular ultrasound guided Palmaz-Schatz stent deployment that were not treated with subsequent anticoagulation after a successful stent implantation procedure. From March, 1993 to April 1994, 411 patients underwent Palmaz-Schatz stent implantation. There were 26 patients that had uncomplicated Palmaz-Schatz stent implantation that were treated with a standard anticoagulation regimen that are not evaluated in this study. Thus, this study includes an assessment of 385 patients that had either a successful intravascular ultrasound guided stent implantation procedure and did not receive post procedure anticoagulation or had a procedural complication. Procedural success was achieved in 369 patients (96%). Clinical success (procedure success without early post procedure event) was achieved in 363 patients (94%). There were 2 acute stent thrombosis events (0.5%) and 1 subacute stent thrombosis (0.3%) in the group of 369 patients with 454 lesions treated without anticoagulation. At 6 month clinical follow-up the incidence of myocardial infarction was 4.9% and the rate of coronary bypass surgery was 6.2%. There was a 2.1% incidence of death. Emergency intervention (emergency angioplasty or bailout stent implantation was necessary in 3 patients (0.8%). The total incidence of repeat percutaneous intervention was 11.4%. By 6 months clinical follow-up, major events had occurred in 19.2% of patients. The angiographic lesion restenosis rate, according to 50% diameter stenosis criteria, was 19%. The incidence of restenosis per patient was 22%. In conclusion, intravascular ultrasound guided Palmaz-Schatz can be performed without subsequent anticoagulation with a low incidence of stent thrombosis and acceptable clinical and angiographic outcome at 6 month clinical follow-up.


Subject(s)
Coronary Disease/therapy , Stents , Ultrasonography, Interventional , Anticoagulants/therapeutic use , Coronary Angiography , Coronary Disease/diagnostic imaging , Coronary Disease/epidemiology , Coronary Thrombosis/epidemiology , Coronary Thrombosis/prevention & control , Equipment Design , Female , Follow-Up Studies , Humans , Male , Middle Aged , Platelet Aggregation Inhibitors/therapeutic use , Prospective Studies , Recurrence , Stents/adverse effects , Time Factors , Treatment Outcome
12.
Arch Cardiol Mex ; 71(4): 286-94, 2001.
Article in Spanish | MEDLINE | ID: mdl-11806031

ABSTRACT

Covering a stent with a membrane (stent graft) allows treatment of diverse coronary abnormalities such as aneurysms, rupture and fistulas (which, until recently, required surgical therapy). A stent graft could also reduce embolic complications associated with angioplasty of saphenous vein grafts. The objective of this study is to evaluate bovine pericardium as a graft for conventional stents. In vitro testing of the bovine pericardium disclosed an elasticity of 15% and a resistance to rupture of 0.22 kg/mm2, well above the pressure commonly used during stent deployment. In 18 pigs, 29 of 32 (90.63%) attempts to implant stent grafts were successful. Histology of acute porcine studies revealed correct apposition of the stent graft to the vessel wall, subacute and chronic (10 days and 1 month) samples showed adequate endothelization and exclusion of proliferative media. Twenty stents were placed in 15 patients with a 100% success rate. Seven patients had coronary aneurysms and in all a complete exclusion of the aneurysm was obtained without complications. Fourteen patients have a follow-up of 6 or more months with evidence of clinical restenosis in 2 (14.28%), whereas angiographic follow-up in 9 patients, which included the 2 cases with recurrent angina, evidenced restenosis in 3 of 14 stents (21.4%), two of which were overlapped in the LAD of one patient and one corresponded to a series of 9 stents (in 5 patients) placed in saphenous vein grafts. It is concluded that bovine pericardium is a suitable material for stent-grafts and its efficacy to seal coronary aneurysms was demonstrated. These results warrant a larger comparative study to better define its restenosis rate and further delineate its usefulness in the treatment of diseased saphenous vein grafts.


Subject(s)
Coated Materials, Biocompatible , Pericardium , Stents , Vascular Diseases/surgery , Animals , Cattle , Female , Humans , In Vitro Techniques , Male , Middle Aged , Swine
14.
Cathet Cardiovasc Diagn ; 24(4): 256-8, 1991 Dec.
Article in English | MEDLINE | ID: mdl-1756559

ABSTRACT

We describe a case of percutaneous transluminal coronary angioplasty in which we implanted a balloon expandable Palmaz-Schatz stent into a high-grade restenosed lesion at the origin of the left internal mammary graft.


Subject(s)
Mammary Arteries , Stents , Aged , Angioplasty, Balloon, Coronary , Coronary Angiography , Coronary Disease/diagnostic imaging , Coronary Disease/surgery , Coronary Disease/therapy , Graft Occlusion, Vascular/therapy , Humans , Male , Mammary Arteries/diagnostic imaging , Recurrence
15.
Cathet Cardiovasc Diagn ; 35(4): 355-7, 1995 Aug.
Article in English | MEDLINE | ID: mdl-7497510

ABSTRACT

A patient undergoing attempted angioplasty of a left internal mammary artery graft to left anterior descending coronary artery developed an iatrogenic dissection of the left subclavian artery, with symptoms of left arm claudication. A balloon expandable stent was inserted with an excellent angiographic result. The patient has remained free of symptoms or signs of decreased arm flow, with a patent subclavian artery demonstrated on angiography 8 months later. The excellent early-to-moderate term clinical and angiographic results support the efficacy of this technical approach.


Subject(s)
Angioplasty, Balloon/adverse effects , Stents , Subclavian Artery/injuries , Angioplasty, Balloon/instrumentation , Graft Occlusion, Vascular/therapy , Humans , Iatrogenic Disease , Male , Mammary Arteries , Middle Aged
16.
Cathet Cardiovasc Diagn ; 30(2): 131-7, 1993 Oct.
Article in English | MEDLINE | ID: mdl-8221865

ABSTRACT

High speed coronary rotational ablation followed by adjunctive low pressure coronary balloon angioplasty was used in 166 patients. Complex lesions were present in 63% of patients. Clinical success was achieved in 157 patients (95%). Angiographic success rate was 10% in A lesions, 95% in B1 lesions, 98% in B2 lesions, and 93% in C lesions. Mean vessel lumen diameter has increased from 0.4 mm to 1.4 mm after rotational ablation and to 2.3 mm following adjunctive balloon angioplasty. Left ventricular dysfunction, the presence of total occlusion, and the severity of stenosis before the procedure were predictive of clinical failure. There were three abrupt vessel closures (1.8%) with one Q wave myocardial infarction. Non-Q wave myocardial infarction occurred in 14 patients (8.4%) and three patients died during hospitalisation (1.8%). We conclude that rotational atherectomy followed by adjunctive low pressure balloon angioplasty gives comparable high success rates in different coronary lesions.


Subject(s)
Angioplasty, Balloon, Coronary , Atherectomy, Coronary , Coronary Disease/therapy , Angioplasty, Balloon, Coronary/adverse effects , Angioplasty, Balloon, Coronary/methods , Atherectomy, Coronary/adverse effects , Combined Modality Therapy , Coronary Angiography , Coronary Disease/diagnostic imaging , Female , Humans , Male , Middle Aged , Recurrence , Risk Factors
17.
Cathet Cardiovasc Diagn ; 40(4): 372-6, 1997 Apr.
Article in English | MEDLINE | ID: mdl-9096938

ABSTRACT

Spontaneous coronary artery dissection is an extremely rare cause of myocardial infarction. It has been reported mainly in young women during or after pregnancy. The prognosis and treatment of coronary dissection are not clear. We report three cases of spontaneous coronary artery dissection in young women. One of them was pregnant and one was 2 weeks after delivery. The dissection involved the left anterior descending artery (LAD) in two cases and the left main coronary artery in one case. There was no evidence of atherosclerosis on angiography or intracoronary ultrasound in any of the patients. Two of the women were treated by stent implantation with excellent results. This is the first known report of successful coronary stenting of spontaneous coronary artery dissection. The pregnant woman was not a candidate for stent implantation and underwent implantation of the left internal mammary to the LAD without cardiopulmonary bypass. She completed her pregnancy uneventfully.


Subject(s)
Aortic Dissection/therapy , Coronary Aneurysm/therapy , Myocardial Infarction/therapy , Pregnancy Complications, Cardiovascular/therapy , Puerperal Disorders/therapy , Adult , Aortic Dissection/complications , Aortic Dissection/diagnosis , Angioplasty, Balloon/instrumentation , Coronary Aneurysm/complications , Coronary Aneurysm/diagnosis , Coronary Angiography , Coronary Artery Bypass , Female , Humans , Myocardial Infarction/diagnosis , Myocardial Infarction/etiology , Pregnancy , Pregnancy Complications, Cardiovascular/diagnosis , Pregnancy Complications, Cardiovascular/etiology , Puerperal Disorders/diagnosis , Puerperal Disorders/etiology , Stents , Ultrasonography, Interventional
18.
Cathet Cardiovasc Diagn ; 25(4): 293-6, 1992 Apr.
Article in English | MEDLINE | ID: mdl-1571991

ABSTRACT

To diminish the restenosis rate after successful recanalization of chronic total coronary occlusion, we have implanted the Palmaz-Schatz stent in 6 patients. All procedures were successfully done without major complications. The angiographic follow-up at 6 months showed restenosis in one asymptomatic patient who had had 2 stents implanted. Five other patients had no evidence of restenosis.


Subject(s)
Angioplasty, Balloon, Coronary/instrumentation , Cardiac Catheterization/instrumentation , Coronary Disease/therapy , Stents , Adult , Aged , Anticoagulants/administration & dosage , Combined Modality Therapy , Coronary Angiography , Coronary Disease/diagnostic imaging , Follow-Up Studies , Humans , Male , Middle Aged , Recurrence
19.
Cathet Cardiovasc Diagn ; 25(4): 304-8, 1992 Apr.
Article in English | MEDLINE | ID: mdl-1571994

ABSTRACT

We developed an alternative method to stent suitable lesions located in anatomical settings considered to be too complex for regular Palmaz-Schatz stent placement. This method consists of using a disarticulated (one-half) Palmaz-Schatz stent. Eight patients underwent stenting utilizing this method. The left anterior descending was stented in five patients, the right coronary artery in one patient, the proximal and mid shaft of a vein graft in one patient, and a protected left main coronary artery in one patient. In all patients the stents were placed in addition to full stents. In four patients, 1 1/2 stents were placed; two patients had 2 1/2 stents; one patient had 3 1/2 stents and the last patient had a total of 5 stents placed (1 full stent and 8 half stents). One patient had 8 disarticulated stents placed. All half stents prepared for delivery were successfully deployed to the pre-designated angiographic site without complication.


Subject(s)
Angioplasty, Balloon, Coronary/instrumentation , Cardiac Catheterization/instrumentation , Coronary Disease/therapy , Stents , Coronary Angiography , Coronary Disease/diagnostic imaging , Equipment Design , Humans , Myocardial Infarction/diagnostic imaging , Myocardial Infarction/therapy
20.
Echocardiography ; 7(4): 389-95, 1990 Jul.
Article in English | MEDLINE | ID: mdl-10149202

ABSTRACT

Intravascular ultrasound provides cross-sectional images of arteries and enables accurate delineation of lumen dimensions and wall structure. Moreover, ultrasound characterization of atherosclerotic plaque subtypes may have important implications in determining the natural history and the clinical outcome of patients with coronary artery disease. The reliability of intravascular ultrasound to differentiate plaque morphology subtypes was studied in 60 coronary segments excised from 33 coronary arteries obtained from 17 patients at necropsy. Ultrasound was performed with a 25-MHz transducer mounted on the distal end of a rigid probe that was rotated manually inside the lumen artery. Plane film radiography was also performed to establish the presence of calcific deposits. A total of 82 histologic transverse sections corresponding to 82 ultrasound imaging sites were studied from the 60 coronary segments. Of the first 54 images, 36 were fibrous plaques and yielded dense homogenous echo reflections, 6 had discrete areas of lipid that were less echogenic and 12 had calcific deposits that cast echo-free shadows beyond areas of intense echo reflections. The predictive accuracy of evaluating plaque composition in the remaining 28 ultrasound imaging sites was 96%. Thus, anatomical structure of coronary arteries and composition of atherosclerotic lesions can be assessed accurately with intravascular ultrasound and may have potential for better understanding of the atherosclerotic process and provide guidance to interventional procedures.


Subject(s)
Coronary Artery Disease/diagnostic imaging , Coronary Vessels/pathology , Aged , Aged, 80 and over , Coronary Artery Disease/pathology , Coronary Vessels/diagnostic imaging , Female , Humans , Male , Middle Aged , Transducers , Ultrasonography/instrumentation , Ultrasonography/methods
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