Search results for "Balloon"
showing 10 items of 238 documents
High-speed rotational angioplasty-induced echo contrast in vivo and in vitro optical analysis
1992
High-speed rotational angioplasty is being evaluated as an alternative interventional device for the endovascular treatment of chronic coronary occlusions. It has been postulated that this type of angioplasty device may produce particulate debris or cavitations that induce myocardial ischemia. To determine the clinical presence of myocardial ischemia during rotational angioplasty, echocardiographic monitoring for wall motion abnormalities was performed in 9 patients undergoing rotational atheroablation using the Auth Rotablator for 10-sec intervals at 150,000 and 170,000 rpm. No wall motion abnormalities were detected in 5 patients evaluated with transesophageal echocardiography or in 4 pat…
Results of intracoronary stents for management of coronary dissection after balloon angioplasty.
1991
Dissections after coronary balloon angioplasty are risk factors for acute or subacute vessel closures. Intracoronary stenting was developed to avoid these complications by pressing the intimal and medial flaps against the vessel wall, thus reducing the risk of acute thrombosis. A total of 22 stents were implanted into the coronary arteries of 15 patients with dissections after balloon angioplasty causing angina pectoris or ischemic electrocardiographic changes. Stent delivery was successful in all cases. In 1 patient acute stent thrombosis was documented and treated successfully by thrombolytic therapy. Another patient underwent coronary artery bypass surgery 24 hours later because of persi…
Comparison of myocardial perfusion reserve before and after coronary balloon predilatation and after stent implantation in patients with postangiopla…
1996
Background Stents provide a scaffold for coronary arteries after angioplasty and inhibit elastic recoil. Methods and Results In 25 patients with postangioplasty restenosis of the left anterior descending artery, ECG-gated digital subtraction coronary angiograms were recorded at baseline and during hyperemia (12 mg papaverine IC) before and after balloon predilatation (PTCA), after implantation of a Palmaz-Schatz stent, and after 6 months. Densitometric evaluation revealed different time and density parameters to calculate two definitions of myocardial perfusion reserve (MPR1 and MPR2) and maximum flow ratio (MaxFR). Poststenotic MPR1 increased from 1.57±0.14 to 2.59±0.86 after PTCA and to …
Exercise echocardiography for the evaluation of patients after nonsurgical coronary artery revascularization.
1993
Objectives. The purpose of this study was to demonstrate the accuracy of stress echocardiography for detecting the progression of coronary artery disease after nonsurgical revascularization. Background. The expanding role of nonsurgical coronary revascularization procedures mandates the development of sensitive noninvasive techniques for tbe detection of recurrent ischemia. Methods. Bicycle stress echocardiography was performed in a series of 86 patients 6.5 ±1.3 months after a revascularization procedure. Seven patients were excluded from analysis because of poor echocardiographic image quality. Results. Digital analysis achieved a sensitivity of 83% for the entire group and a specificity …
Emergency angioplasty of totally occluded left main coronary artery in acute myocardial infarction and unstable angina pectoris--institutional experi…
1994
Acute occlusion of the left main coronary artery (LMCA) is a rare angiographic finding. We report five patients with acute myocardial infarction (AMI) and one patient with unstable angina, in whom reperfusion was achieved or attempted with percutaneous transluminal coronary angioplasty (PTCA). All patients had a long history of stable angina pectoris. The indication for emergency PTCA was cardiogenic shock in the five patients with MI. PTCA was successful in five of six patients. Three patients with reperfusion survived, three died. All survivors underwent coronary artery bypass grafting (CABG) and were still alive at 23 months, 3 and 8 years respectively in NYHA functional class II or III.…
Impact of endovascular treatment on clinical status and health-related quality of life.
2008
Background and Aims: Investigating the impact of percutaneous transluminal angioplasty (PTA) on clinical status and health related quality of life in patients with claudication and critical limb ischaemia (CLI). Material and Methods: 61 patients and 64 limbs underwent a primary PTA (30 claudication and 34 CLI cases). Clinical status was graded according to Ahn and Rutherford and ankle/brachial index (ABI). Quality of life was assessed using the Nottingham Health Profile (NHP) preoperatively, one month and one year after the procedure. Triplex scan evaluation of the treated arterial segment was carried out postoperatively and one year after the procedure. Results: Claudication: 24/27 patient…
Combined medical and mechanical recanalization in acute myocardial infarction
1985
A technique of combined medical and mechanical recanalization was employed in 96 patients with acute transmural myocardial infarction. The mean time between onset of symptoms and admission to hospital was 170 +/- 65 min (X +/- SD). After 10 +/- 16 min, 250,000 U streptokinase was administered intravenously for 20 min. Intracoronary thrombolysis was commenced within 38 +/- 14 min. First coronary angiograms demonstrated reperfusion, an open vessel in 25/96 patients (26%). In 15/71 patients (21%) reperfusion occurred during thrombolysis therapy, before mechanical recanalization could be performed. Recanalization was achieved mechanically in 37/71 patients (52%) with occluded coronary vessels. …
Long-term outcomes of percutaneous coronary interventions or coronary artery bypass grafting for left main coronary artery disease in octogenarians (…
2014
Percutaneous coronary intervention (PCI) with drug-eluting stents is an accepted alternative to surgery for the treatment of unprotected left main coronary artery (ULMCA) disease, but the long-term outcome in elderly patients is unclear. Aim of our study was to compare the clinical outcomes of octogenarians with ULMCA disease treated either with PCI with drug-eluting stents or coronary artery bypass grafting (CABG). The primary study end point was the composite of death, cerebrovascular accident, and myocardial infarction at follow-up. A total of 304 consecutive patients with ULMCA stenosis treated with PCI or CABG and aged 80 years were selected and analyzed in a large multinational regist…
Maximum forces acting on the abdominal wall: Experimental validation of a theoretical modeling in a human cadaver study
2011
Incisional hernias following median laparotomy have a high incidence and recurrence rate after repair, so that a better understanding of the linea alba biomechanics is desirable. The mechanical stress exerted on the linea alba in living humans is primarily generated by the musculature. In this human cadaver study, intraabdominal pressure was simulated by insertion of a balloon that was increasingly filled to maximal pressures of 200 mbar. The related forces acting transversely on the linea alba at maximum pressure were found to be between 41.6 and 52.2 N/cm (mean = 45.9 N/cm), which is in agreement with a recent modeling of the related forces.
Retrograde endoureterotomy as a treatment option for impacted calculus in the ureterointestinal junction
2021
Introduction: In patients with a history of radical cystectomy and with intestinal diversion, urolithiasis in the upper urinary tract is a frequent event. Material and methods: We describe for the first time a case of retrograde endoureterotomy used to treat a calculus proximal to the ureterointestinal junction. Results: This technique is of interest when antegrade access is not possible. In our example, after passing the guidewire percutaneously, and externalize it through the stoma, the left meatus was reached with a resectoscope inserted through the ileal duct. After the use of a balloon to prevent migration of the calculus, a retrograde endoureterotomy was performed with a Collins knife…