Publications by authors named "Stefano Pirrelli"

8 Publications

  • Page 1 of 1

Differences in hub and spoke vascular units practice during the novel Coronavirus-19 (COVID-19) outbreak in Lombardy, Italy.

J Cardiovasc Surg (Torino) 2021 Feb 23;62(1):71-78. Epub 2020 Sep 23.

Unit of Vascular Surgery, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy -

Background: To highlight differences in clinical practice among referral (hub, HH) or satellite (spoke, SH) hospital vascular surgery units (VSUs) in Lombardy, during the COVID-19 pandemic "phase 1" period (March 8 - May 3, 2020).

Methods: The Vascular Surgery Group of Regione Lombardia Register, a real-word, multicenter, retrospective register was interrogated. All patients admitted with vascular disease were included. Patients' data on demographics, COVID-19 positivity, comorbidities and outcomes were extrapolated. Two cohorts were obtained: patients admitted to HH or SH. Primary endpoint was 30-day mortality rate. Secondary outcomes were 30-day complications and amputation (in case of peripheral artery disease [PAD]) rates. Univariate and multivariate analysis were used to compare HH and SH groups and predictors of poor outcomes.

Results: During the study period, 659 vascular patients in 4 HH and 27 SH were analyzed. Among these, 321 (48.7%) were admitted to a HH. No difference in COVID-19 positive patients was described (21.7% in HH vs. 15.9% in SH; P=0.058). After 30 days from intervention, HH and SH experienced similar mortality and no-intervention-related complication rate (12.1% vs. 10.0%; P=0.427 and 10.3% vs. 8.3%; P=0.377, respectively). Conversely, in HH postoperative complications were higher (23.4% vs. 16.9%, P=0.038) and amputations in patients treated for PAD were lower (10.8% vs. 26.8%; P<0.001) than in SH. Multivariate analysis demonstrated in both cohorts COVID-19-related pneumonia as independent predictor of death and postoperative complications, while age only for death.

Conclusions: HH and SH ensured stackable results in patients with vascular disease during COVID-19 "phase 1." Despite this, poor outcomes were observed in both HH and SH cohorts, due to COVID-19 infection and its related pneumonia.
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February 2021

1-Month Results From a Prospective Experience on CAS Using CGuard Stent System: The IRONGUARD 2 Study.

JACC Cardiovasc Interv 2020 Sep 26;13(18):2170-2177. Epub 2020 Aug 26.

Vascular and Endovascular Surgery Unit, Department of Surgery Paride Stefanini, Sapienza University of Rome, Rome, Italy.

Objectives: This study sought to evaluate 30-day safety and efficacy of dual-layer mesh-covered carotid stent systems for carotid artery stenting (CAS) in the clinical practice.

Background: When compared with carotid endarterectomy, CAS has been associated with a higher rate of post procedural neurologic events; these could be related to plaque's debris prolapsing through stent's mesh. Consequently, the need for increased plaque coverage has resulted in the development of dual-layer mesh-covered carotid stent systems.

Methods: From January 2017 to June 2019, a physician-initiated, prospective, multispecialty registry enrolled 733 consecutive patients undergoing CAS using the CGuard embolic prevention system in 20 centers. The primary endpoint was stroke up to 30 days; secondary endpoints were technical and procedural success; external carotid artery occlusion; and in-hospital and 30-day transient ischemic attack (TIA), acute myocardial infarction (AMI), and death rates.

Results: Symptoms were present in 131 (17.87%) patients. An embolic protection device was used in 731 (99.72%) patients. Procedural success was 100%, technical success was obtained in all but 1 (99.86%) patient, who died in hospital due to a hemorrhagic stroke. Six TIAs, 2 minor strokes, and 1 AMI occurred during in-hospital stay, and external carotid artery occlusion was evident in 8 (1.09%) patients. Between hospital discharge and 30-day follow-up, 2 TIAs, 1 minor stroke, and 3 AMIs occurred. Therefore, the cumulative stroke rate was 0.54%.

Conclusions: This real-world registry suggests that use of CGuard embolic prevention system in clinical practice is safe and associated with a minimal occurrence of adverse neurological events up to 30-day follow-up.
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September 2020

Combined Transcatheter Treatment of Severe Aortic Valve Stenosis and Infrarenal Abdominal Aortic Aneurysm in Increased Surgical Risk Patients.

Ann Vasc Surg 2019 Oct 12;60:480.e1-480.e5. Epub 2019 Jun 12.

Cardiology Division, Foundation IRCCS Policlinico San Matteo, Pavia, Italy.

The prevalence of combined severe aortic stenosis and abdominal aortic aneurysm is increasing with the aging of the population. Both conditions are associated with adverse outcome if not adequately managed. The choice of the optimal treatment of these patients is challenging and no clear recommendations are available. We report 2 cases of patients with concomitant severe symptomatic aortic stenosis and infrarenal abdominal aortic aneurysm successfully treated with combined transfemoral transcatheter aortic valve implantation (TAVI) and endovascular aortic aneurysm repair (EVAR). The reported cases demonstrate the versatility of transcatheter techniques and suggest that, in carefully selected patients, the combined procedure of TAVI plus EVAR, if performed by multidisciplinary expert operators, is safe and effective.
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October 2019

Complete aortic arch remodeling after stent graft of acute type B dissection and Kommerell's diverticulum.

Ann Thorac Surg 2012 Feb;93(2):673

Division of Vascular Surgery, Foundation IRCCS Policlinico San Matteo, Pavia, Italy.

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February 2012

Impact of carotid stent cell design on vessel scaffolding: a case study comparing experimental investigation and numerical simulations.

J Endovasc Ther 2011 Jun;18(3):397-406

Department of Structural Mechanics, Università degli Studi di Pavia, Italy.

Purpose: To quantitatively evaluate the impact of carotid stent cell design on vessel scaffolding by using patient-specific finite element analysis of carotid artery stenting (CAS).

Methods: The study was organized in 2 parts: (1) validation of a patient-specific finite element analysis of CAS and (2) evaluation of vessel scaffolding. Micro-computed tomography (CT) images of an open-cell stent deployed in a patient-specific silicone mock artery were compared with the corresponding finite element analysis results. This simulation was repeated for the closed-cell counterpart. In the second part, the stent strut distribution, as reflected by the inter-strut angles, was evaluated for both cell types in different vessel cross sections as a measure of scaffolding.

Results: The results of the patient-specific finite element analysis of CAS matched well with experimental stent deployment both qualitatively and quantitatively, demonstrating the reliability of the numerical approach. The measured inter-strut angles suggested that the closed-cell design provided superior vessel scaffolding compared to the open-cell counterpart. However, the full strut interconnection of the closed-cell design reduced the stent's ability to accommodate to the irregular eccentric profile of the vessel cross section, leading to a gap between the stent surface and the vessel wall.

Conclusion: Even though this study was limited to a single stent design and one vascular anatomy, the study confirmed the capability of dedicated computer simulations to predict differences in scaffolding by open- and closed-cell carotid artery stents. These simulations have the potential to be used in the design of novel carotid stents or for procedure planning.
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June 2011

Iatrogenic pulmonary artery rupture due to chest-tube insertion.

Tex Heart Inst J 2010 ;37(6):732-3

Division of Vascular Surgery, Department of Anesthesiology & Critical Care Medicine, General Surgical Clinic, Foundation I.R.C.C.S. Policlinico San Matteo, 27100 Pavia, Italy.

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April 2011

Endovascular treatment of acute type B dissection and Kommerell's diverticulum.

Ann Thorac Surg 2007 Nov;84(5):1736-8

Division of Vascular Surgery, Foundation I.R.C.C.S. Policlinico San Matteo, Pavia, Italy.

A 59-year-old man presented with severe hypertension and resistant interscapular pain. Transesophageal echocardiography and computed tomographic angiogram demonstrated acute type B dissection associated with aberrant right subclavian artery with 3.5 cm Kommerell's diverticulum. Open repair was deemed to be high risk to elevate perioperative mortality and morbidity of this surgical technique. Therefore the patient was managed with an endovascular procedure after 14 days of medical therapy because of resistant thoracic pain. We did not observe intraoperative or perioperative mortality and right arm ischemia or symptomatic subclavian steal.
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November 2007

Deferment of objective assessment of deep vein thrombosis and pulmonary embolism without increased risk of thrombosis: a practical approach based on the pretest clinical model, D-dimer testing, and the use of low-molecular-weight heparins.

Arch Intern Med 2004 Dec 13-27;164(22):2477-82

Thrombosis and Hemostasis Unit, Division of Haematology, University of Palermo, Palermo, Italy.

Background: Treatment of patients with suspected deep vein thrombosis (DVT) or pulmonary embolism (PE) is problematic if diagnostic imaging is not immediately available. Pretest clinical probability (PCP) and D-dimer assessment can be used to identify patients for whom empirical protective anticoagulation is indicated. To evaluate whether PCP and D-dimer assessment, together with the use of low-molecular-weight heparins (LMWHs), allow objective appraisal of DVT and PE to be deferred for up to 72 hours, patients with suspected DVT and PE were prospectively examined.

Methods: Patients identified with a high PCP or a moderate PCP with positive D-dimer test results received a protective full-dose treatment of LMWH; the remaining patients were discharged without anticoagulant administration. However, all patients were scheduled to undergo objective tests for DVT or PE within 72 hours. Standard antithrombotic therapy was administered when deferred diagnostic tests confirmed venous thromboembolism.

Results: In total, 409 consecutive patients with suspected DVT and 124 with suspected PE were included in this study. A total of 23.8% (95% confidence interval [CI], 20.3%-27.3%) of patients had confirmed venous thromboembolism. At the short-term follow-up (72 hours), only a single thromboembolic event (0.2%; upper 95% CI, 0.6%) had occurred, whereas at the 3-month follow-up, 5 events (1.2%; 95% CI, 0.2%-2.1%) had occurred in patients in whom diagnosis of DVT or PE had previously been ruled out. None of the patients had major bleeding events. Ninety percent of patients were treated as outpatients.

Conclusion: Our study demonstrates that this approach allows the safe deferral of diagnostic procedures for DVT and PE for up to 72 hours.
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January 2005