Poster session 25: Peripheral arterial disease
Transcription
Poster session 25: Peripheral arterial disease
Poster session 25: Peripheral arterial disease P25.01 Outcomes of percutaneous transluminal angioplasty (PTA) in elderly with ischemic diabetic foot Cesare Miranda, Azienda Ospedaliera S.Maria Degli Angeli, Pordenone, Italy Matteo Cassin, Azienda Ospedaliera S.Maria Degli Angeli, Pordenone, Italy Riccardo Neri, Azienda Ospedaliera S.Maria Degli Angeli, Pordenone, Italy Roberto Da Ros, Hospital San Polo, Monfalcone, Italy Giorgio Zanette, Azienda Ospedaliera S.Maria Degli Angeli, Pordenone, Italy Background: Successful revascularization reduces the major amputation rate in diabetic patients presenting with critical limb ischemia (CLI) . AIM To evaluate the outcomes of percutaneous transluminal angioplasty ( PTA) in elderly with ischemic diabetic foot (DF). Materials and methods: We have retrospectively selected all elderly diabetic patients ( ≥65 years) admitted in our two foot centres in 2 consecutive years with diabetic foot and a diagnosis of critical limb ischemia (CLI), in according to the TransAtlantic Inter-Society Consensus (TASC 2007) and who underwent PTA. Treatment strategy was decided by a team of diabetologist, interventional cardiologists and vascular surgeon.From January 2012 to December 2013 a total of 46 patients were included. Mean (SD) age of the patients was 78.6, (6.37) years, and 31 patients (67.3%) were male. Results: PTA was performed in 67 limbs, the treated arteries were localized below the knee ( 56.7%), above the knee ( 28.3%), being the remaining (14.9%) treated at both levels, the limb salvage rate was 97% after a mean follow-up of 267.5 ±145.1 days, minor amputations rate was 41.3 %, target-vessel re-stenosis had occurred in 19 2% of non-amputated limb, two patients (4.34%) had died because conditions unrelated to PTA and nine patients ( 19.5%) did not heal . Conclusions: In our selected patient population with diabetic foot and critical limb ischemia a successful endovascular procedure led to a high percentage of limb salvage and confirms the positive role of PTA-First Approach for revascularization of elderly with CLI and DF. www.diabeticfoot.nl Page 1 of 11 P25.02 Crural percutaneous transluminal angioplasty in ischemic diabetic foot ulcera: a retrospective analysis René Scheer, Ziekenhuisgroep Twente, Almelo, Netherlands Jaap van Netten, Ziekenhuisgroep Twente, Almelo, Netherlands Robbert Meerwaldt, Medisch Spectrum Twente, Enschede, Netherlands J van Baal, Ziekenhuisgroep Twente, Almelo, Netherlands M. Kraai, Ziekenhuisgroep Twente, Almelo, Netherlands Aim: To evaluate the results of crural percutaneous transluminal angioplasty (PTA) in patients with ischemic diabetic foot ulcera in our dayly practice. ` Methods: A retrospective study was conducted at two general hospitals, between January 2012 and November 2014. Data was retrieved from patient records. All patients with a foot ulcer and diabetes, who underwent an infrapopliteonal PTA were included. Results: A number of 83 patients was included. Patients were mostly male (72%) with a mean age of 74.2 years (SD 11.1). Stage C (56.6%) and grade 2 (47%) ulcera were most common according to the Texas University wound classification. Mean toe pressure was 29 mmHg (SD 22). The mean interval between diagnosis and PTA was 1.3 months (SD 2.7). A number of 24 ulcera (30.1%) healed and 34 (41%) amputations were performed. The mean time of follow-up was 10.9 months (SD 10.4). Conclusion: The current series is one of the largest that is published by centers that are not specialised in either endovascular or bypass treatment. The results of this study are a useful addition to the ongoing debate on the most effective vascular treatment for ischemic diabetic foot ulcers. www.diabeticfoot.nl Page 2 of 11 P25.03 Posterior tibial artery recanalization by “pedal-plantar loop technique”: a case report in diabetic patient with infective necrosis foot Roberto De Giglio, Azienda Ospedaliera Legnano, Abbiategrasso, Italy Gianni De Angelis, Azienda Ospedaliera Legnano, Abbiategrasso, Italy Anna Socrate, Azienda Ospedaliera Legnano, Legnano, Italy Teresa Mondello, Azienda Ospedaliera Legnano, Abbiategrasso, Italy Ilaria Formenti, Azienda Ospedaliera Legnano, Abbiategrasso, Italy Sara Lodigiani, Azienda Ospedaliera Legnano, Abbiategrasso, Italy Giacoma Di Vieste, Azienda Ospedaliera Legnano, Abbiategrasso, Italy Gianmario Balduzzi, Azienda Ospedaliera Legnano, Abbiategrasso, Italy A male diabetic patient of 65 years is reported who presented with infective necrosis of second toe (III D according to TWC) and initial lesion of left hindfoot (I C). Transcutaneous oximetry (TcPO2) at the dorsum of the foot was TcPO2 = 37 mmHg in the presence of mild oedema. After amputation of the second toe necrotic, the wound was left open and underwent revascularization of the left lower. The first step was to have an anterograde approach through common artery by using a 11 cm long 5F introducer sheath. The angiographic study shown the patency of femoro-popliteal artery, while the tibio peroneal trunk, was steno-occluded, the, posterior and the peroneal arteries were occluded at ostium and the pedal-plantar loop and dorsal pedis artery were open. The hindfoot was not vascolarized. By using a light support straight, 0.14” wire and, as support, a compatible balloon, we fail in overcome the distal posterior tibial artery and enter the plantar common artery. To avoid dissection, we placed an other wire in lateral plantar artery through deep perforanting artery by using the “pedal-plantar loop technique”. The rendez-vous, in, lateral plantar artery guaranteed the intravascular position of the wire. So we made an anterograde revascularization of lateral plantar artery, posterior tibial artery and tibio- peroneal trunk. Final angiographic control documented the posterior circulation (posterior tibial artery and lateral plantar artery) and medial calcaneal branches patency. The initial lesion of left hindfoot healed spontaneously, while in the forefoot was removed all gangrenous tissue and was necessary the amputation of the second and the third toe with metatarsal head (patient refused transmetatarsal amputation). In this clinic case this technique of revascularization extreme allowed the limb salvage in the ischemic foot. www.diabeticfoot.nl Page 3 of 11 P25.04 Postoperative revascularization by percutaneous transluminal angioplasty after free flap reconstruction of diabetic foot ulcer Donghyeok Shin, Konkuk University Medical Center, Seoul, Korea, South Wonchul Choi, Konkuk University Medical Center, Seoul, Korea, South Aim: Approximately 50% of diabetic foot ulcer patients have peripheral arterial disease clinically and it is one of the major risk factors for free flap failure. Revascularization should be, essential, especially, when free flap surgery was planned in these patients. After successful re-establishment of circulation, what can we do when the active pumping from recipient vessel after identifying it and donor flap harvesting? Nobody could guarantee the flap survival with postoperative percutaneous transluminal angioplasty (PTA). We report two cases of successful free flap reconstruction of diabetic foot ulcer through postoperative revascularization despite of intraoperative arterial circulatory compromise. Methods: Case 1) A 74-year-old female patient had necrotic diabetic foot ulcer on her 3rd, 4th toe. We performed anterolateral thigh free flap and noticed circulatory compromise in dorsalis pedis artery. After completion of operation, we revascularized the vessel with PTA 13 hours after the operation(Fig. 1). Case 2) A 74-year-old male patient had chronic diabetic foot ulcer on his right big toe for over 5 months. We performed anterolateral free flap and noticed the abrupt loss of active pumping from, 1st metatarsal artery during the operation. We decided to revascularize the vessel via PTA immediately after the operation. Results: Both PTA were successful. The patient in case 1 showed partial necrosis, however, the defect could be covered with skin graft easily. The patient in case 2 showed complete flap survival. Conclusion: When diabetic foot ulcer patients present unexpected abrupt arterial insufficiency from recipient vessel during free flap surgery, postoperative revascularization with PTA can be helpful to reverse the circulatory compromise and boost the flap survival. Fig. 1. (A) Preoperative angiogram showing the patent dorsalis pedis artery. (B) Postoperative angiogram before percutaneous transluminal angioplasty (PTA) showing total occlusion of the dorsalis pedis artery (black arrows). (C) Postoperative angiogram after PTA showing the revascularized dorsalis pedis artery (black arrows) and excellent blood flow into the flap (white arrow). www.diabeticfoot.nl Page 4 of 11 P25.05 Angioplasty of peripheral arteries for diabetic and non-diabetic patients: Can we rely on balloon angioplasty with limited use of stents? Konstantinos Papazoglou, Aristotle's University of Thessaloniki, Thessaloniki, Greece Konstantinos Konstantinidis, "Kyanous Stavros" EUROMEDICA Clinic, Thessaloniki, Greece Maria Mitka, "Kyanous Stavros" EUROMEDICA Clinic, Thessaloniki, Greece Aim: To report our experience of the treatment of patients (diabetics and non-diabetics) using strictly endovascular techniques (simple balloon angioplasty with or without stenting) and the results of 6 to 30 month follow-up. Methods: During the period of April 2009 to April 2011, 175 patients (133 males and 42 females) underwent endovascular procedures for the treatment of various types of PAD. Patients were divided in two main groups regarding the presence (Group A) or not (Group B) of concomitant type-B Diabetes mellitus. Simple balloon angioplasty was the “first choice approach” for every patient using different type of balloons depending on vessel’s diameter and lesion’s length. Whenever there was a case of surgical debridement or amputation of any kind was needed, that was performed following revascularization based on clinical and angiographic condition. Patients are followed for at least 24 months and reoperations were performed whenever needed. Stenting was a “second option” only for cases of dissection or significant restenosis, reserved mainly for the cases of reoperation. Results: Rutherford clinical classification for both groups pre- and post-operatively are shown in the table where improvement in clinical condition following intervention is clearly demonstrated. During the 2 year follow up 24 patients required 33 re-interventions: 27 reinterventions for 17 (26.6%) of the diabetic patients (Group A) and 7 re-interventions for 6 (8.1%) of the non-diabetics (Group B). A total of 211 procedures were performed for both groups, 189 (89.57%) of which consisted of balloon angioplasty (BA) alone while 22 (10.43%) procedures required additional stenting (BAS). Conclusions: Endovascular treatment of PAD could be equally effective in diabetics and non-diabetics, even without the use of elaborate techniques. Consistent follow-up is necessary in order to obtain long-term results. Rutherford classification CLASS 0 CLASS 1 CLASS 2 CLASS 3 CLASS 4 CLASS 5 CLASS 6 Group A (Diabetics) Pre – op Post – op (n) (%) (n) (%) -------n=6, (8.3%) -------n=23 (32.0%) n=7, (9.4) n=19 (26.4%) n=21 (29.2%) n=23 (32.0%) n=13 (18.2%) n=1, (1.3%) n=10 (14.0%) -------n=21 (29.2%) -------- Group B (Non-Diabetics) Pre- op Post-op (n) (%) (n) (%) ------n=13 (12.63%) ------n=50 (48.54%) n=13 (12.63%) n=21 (20.38%) n=43 (41.74%) n=18 (17.48%) n=13 (12.63%) n=1, (0.9%) n=15 (14.56%) ------n=19 (18.44%) ------- www.diabeticfoot.nl Page 5 of 11 P25.06 Distal bypass surgery: An unused tool in the endovascular era? Arkeliana Tase, Watford Hospital, Hertfordshire, United Kingdom Mustafa Halawa, Watford Hospital, Hertfordshire, United Kingdom Raveena Ravikumar, Watford Hospital, Hertfordshire, United Kingdom Aims: Arterial bypass surgery remains the gold standard treatment in chronic limb ischaemia. Recently, there has been a trend towards, endovascular treatment for limb salvage, both as primary and as an adjunct for failing grafts. The aim of this study is to review the results of femoro-BK popliteal/distal bypass procedures carried out between Jan 2010 and Dec 2013 performed by a single surgeon. Method: Retrospective review study of prospectively collected data. All patients that underwent femoral –BK popliteal/distal bypass between Jan 2010 and Dec 2013 were included. Demographic data was collected. The primary outcomes were graft patency and limb salvage rates. The secondary outcome was 30 day mortality. Patients were followed up in the vascular clinic. Graft patency was assessed by dupplex scan as per protocol at 3, 6 and 12 months. All cases of stenosis or occlusion were recorded. Patients found to have graft stenosis were discussed at the vascular MDT meeting and considered for angioplasty. Rates of successful angioplasty were recorded. Also, major, limb amputation (BKA, AKA) rates and 30 day mortality were recorded. Results: During this time 25 patients (20 male, 5 female) underwent 29 femoral-distal bypass procedures. They had a median age of 76 yrs (47-90 yrs). 15 (60%) were diabetic and 18 (72%) had IHD. 24 (96%) patients had tissue loss as ulcers or gangrene. All Duplex scans were reviewed. In all cases where stenosis was found patients underwent angioplasty. Two (7%) grafts were found to be occluded at the first scan post op. At 3 6 and 12 months, these rates were 6 (21%), 7 (24%) and 8(28%) respectively. (Tab 1) 6 patients with graft stenosis underwent angioplasty 5 of which were successful in graft and limb salvage. 5 patients (17%) underwent amputations (2 BKA, 3 AKA): 1 following the failed angioplasty, and 4 following total graft occlusion. Graft patency rate was, 93%, 76% and 72% at 1, 6 and 12 months respectively. Limb salvage rate was 93% and 83% at 30 days and 1 year respectively. The 30 day mortality was 7% (2). Conclusions: Despite widespread use of angioplasty, distal bypass surgery still plays an important role in limb salvage in diabetic patients with PVD. Duplex surveillance is essential to save failing grafts. www.diabeticfoot.nl Page 6 of 11 P25.07 Improved foot salvage through pedal bypasses and pedal arch angioplasty Elias Khalil, King's College Hospital, London, United Kingdom Leslie Fiengo, King's College Hospital, London, United Kingdom Roberta Brambilla, King's College Hospital, London, United Kingdom Hani Slim, King's College Hospital, London, United Kingdom Hiren Mistry, King's College Hospital, London, United Kingdom Domenico Valenti, King's College Hospital, London, United Kingdom Raghvinder Gambhir, King's College Hospital, London, United Kingdom Michael Edmonds, King's College Hospital, London, United Kingdom Hisham Rashid, King's College Hospital, London, United Kingdom Introduction & aim: Both aggressive pedal arch angioplasty as well as pedal bypasses has been used as revascularization methods in the treatment of patients with ischemic diabetic foot. The aim of this research is to evaluate the outcomes of both modalities. Methods: A retrospective analysis was done of all revascularization procedures for ischemic diabetic foot patients at King’s College Hospital. Only patients who underwent pedal bypass (dorsalis pedis artery plantar artery) were included as were patients who underwent pedal arch angioplasty. Primary, primary assisted and secondary patency rates along with 30-day mortality, major amputation rate, amputation-free survival, and overall survival at 1 year were analyzed. Kaplan-Meier survival analysis, were used as appropriate. (Graphpad Prism 6.0) Results: 51 patients underwent pedal bypasses or pedal arch angioplasty in the study period. Median age was 72 years (range 46-90) and male to female ratio was 8:1. Comorbidities included diabetes mellitus (90%), hypertension (75%), end stage renal disease (30%) and ischemic heart disease (30%). Primary, primary assisted and secondary patency rates were 67%, 83% and 86% respectively. With no 30 day mortality, 1-year amputationfree survival was 85% and 1 year overall survival was 90%. Major amputation rate was 4%. Conclusion: This study showed that pedal bypasses and pedal arch angioplasty have excellent outcomes at 1 year. The two modalities complement each other and help prevent amputations and save lives. bypass to dorsalis pedis artery www.diabeticfoot.nl Page 7 of 11 P25.08 Role of spy angio in determining foot vascularity of diabetic patients -pre and post stenting of tibial vessels. Sandeep Raj Pandey, Medanta-The Medicity, Gurgaon, India Purpose: To, evaluate the prognostic and diagnostic, role of, spy angio in, preventing diabtic foot amputation in patients with tibial vessels disease. Methods: A 56-year old female with a 20-year history of DM2, presented at our ER with, painful ischemic, right foot . No ulcer or gangrene yet. Duplex revealed short segment tight stenosis of the right mid ATA .We advised her to undergo PAG and futher proceed to increase arterial flow to the her right foot .She underwent angioplasty and stenting of the left ATA .Spy angio was used to determine the perfusion to the foot, as well as the efficacy of the stenting in reintroducing blood flow .Previously patient had decreased vascularity to the foot. Once stenting, was impeded, all digits filled in the foot .TCPO2 and ABI was done as well pre and post op but didn’t give satisfactory results. Results: Following the stenting, while the patient did experience markedly improved waveform patterns and stent patency, the foot show increased vascularity. Finally, Spy angio, determined adequate perfusion was available to the foot. Patient relieved of ischemic pain. Conclusion: With spy angiography, surface tissue viability can be determined. It is an important prognostic, tool in preventing amputations from vascular deficiencies. It is superior in comparisons to the transcutaneous partial pressure of oxygen test as well as other noninvasive hemodynamic measurements. pre op spy angio www.diabeticfoot.nl Page 8 of 11 P25.09 Bifurcated surgical bypass as bailout procedure in patients with critical limb ischaemia (CLI) and diabetic foot ulcer (DFU) Daniele Adami, University of Pisa, Pisa, Italy Fabrizia Virgiliio, University of Pisa, Pisa, Italy Alberto Piaggesi, University of Pisa, Pisa, Italy Michele Marconi, University of Pisa, Pisa, Italy Raffaella Berchiolli, University of Pisa, Pisa, Italy Chiara Mattaliano, University of Pisa, Pisa, Italy Mauro Ferrari, University of Pisa, Pisa, Italy Aim: To test the safety and effectiveness of bifurcated surgical bypass to the tibial arteries at the ankle level as a bailout intervention in CLI patients candidated to lower extremity amputation (LEA) after previous failed revascularization procedures. Methods: We retrospectively analysed the data of, 116 consecutive, patients with CLI treated by open surgical approach Jan. 2011 - Apr. 2014. In 8 cases the indication of, LEA after previous failed endovascular revascularizations (2.25/pts) was given. All patients had DFU. Inclusion criteria for extreme lower limb revascularization were: no medical contraindication for major surgery, presence of autologous vein conduit, patency of at least one distal tibial artery directed to pedal vessels with another patent artery segment for secondary bypass branch to improve runoff. Surgical planning was set after ultrasound mapping (USM) and angiography. All patients were followed-up with USM at 1, 12 and, 24 months, respectively. Primary end point was, limb salvage rate, while secondary end points were primary and secondary bypass patency rates. Results: All patients (all type 2, aged 63.18±8.37 yrs, duration of diabetes 19.52±11.66 yrs; HbA1c 8.2±1.4%) were treated under general anesthesia. Perioperative mortality and morbidity rates were 0% and 37 8%, respectively; mean inhospital stay was 7.25±1.75 days. The main distal target vessel was the dorsalis pedis in 5 cases, the posterior tibial, at the ankle level in 2 patients and the plantar artery in 1 case. The secondary by-pass branch landed on peroneal artery (6 cases), tibio-peroneal trunk (1 case) and infragenicular popliteal artery (1 case), respectively. Minor amputations and surgical debridment were performed in 5 patients (62.2%), while no patient underwent to LEA. The 1-month primary patency rate was 100%. At 12 months the primary patency rate was 87.5%(7/8) with limb salvage rate of 100%. At 24 months both, primary patency and limb salvage rates were 75%. Mortality rate after 24 months was 25%. Conclusions: In our experience the bifurcated bypass may improve the outflow with, statisfactory limb salvage and mid-term patency rates. In these cases, accurate, preoperative USM and angiographic evaluations are essential to adequately plan the intervention. www.diabeticfoot.nl Page 9 of 11 P25.10 To study the effects of short-term impinging of diabetic foot ulcers with vacuum therapy on skin microcirculation to attain wound closure Rumneek Sodhi, Medanta-The medicity, Haryana, India Method: 19 diabetic foot ulcer patients with peripheral arterial disease (PAD) underwent vacuum therapy on the P6 or P7 preset mode of the VACUUMED therapy system for 40 minutes each.The number of therapy sessions per week and the total number of sessions for each patient was variable depending on the degree of PAD and the size and extent of the wound. Number of session per week varied between 1 to 3 times per patient and the total number of sessions ranged from about 3 to 10 sessions per patient. The leg was positioned in an air-tight plexiglass cylinder in which hypobaric (-110 mm Hg) and hyperbaric (70 mm Hg) pressure could be generated alternately, in order to improve peripheral circulation and also supposedly reduce infection in the wound. All the wounds were dressed daily with a non adhesive foam dressing. The effect on skin microcirculation was investigated using parameters of transcutaneous oxygen tension measurements (TcpO2) and serial photographs to observe wound healing at each therapy visit. Results: 3/19 patients experienced ischemic symptoms during VACUUMED therapy, probably because the leg was pinched off through the inflation of the cuff. Patient’s capillary microscopic parameters changed slightly at first vacuum. After several therapy sessions, TcpO2 improved significantly in most patients (from 3 to 19 mmHg) with progressive wound healing. In Conclusion:VACUUMED therapy significantly improves skin perfusion and oxygenation levels as evident with the increase in transcutaneous oxygen tension measurements (TcpO2) which in turns stimulates wound healing. We therefore conclude that this modality is a useful tool in the armamentarium of diabetic foot care professionals aiming for wound closure The study was not funded by anyone. VACUUMED FLOW REGENERATION SYSTEM www.diabeticfoot.nl Page 10 of 11 P25.11 Vascular calcifications in diabetic patients affected by ischemic foot ulcers: comparison between patients on dialysis and not Marco Meloni, University of Tor Vergata, Rome, Italy Valentina Izzo, University of Tor Vergata, Rome, RM, Italy Erika Vainieri, University of Tor Vergata, Rome, Italy Costantino Del Giudice, University of Tor Vergata, Rome, Italy Valerio Da Ros, University of Tor Vergata, Rome, Italy Laura Giurato, University of Tor Vergata, Rome, Italy Valeria Ruotolo, University of Tor Vergata, Rome, Italy Roberto Gandini, University of Tor Vergata, Rome, Italy Luigi Uccioli, University of Tor Vergata, Rome, Italy Aim: Dialysis is a strong risk factor for peripheral arterial disease (PAD) and vascular calcification (VC). This condition increases the severity of vascular disease in diabetic patients and the risk of both ulceration and amputation.(1 2) The aim of this study was to evaluate the differences in terms of VC among patients on dialysis and not in a population of diabetic subjects affected by critical limb ischemia (CLI) and foot ulcer (FU). Methods: Among 456 diabetic patients who performed ET because of a condition of CLI complicated by FU we have identified two groups in relation to dialysis therapy (D+)(n=60) and not (D-)(n=396). We have selected patients with more severe PAD that needed at least a new ET to reach limb salvage: n=18 (24.7%) from D+, n=61(14.7%) from D-. According to peripheral arterial calcium system score (PACSS), we evaluated the severity and the localization of VC in the vessels above the knee (ATK) and below the knee (BTK) (Tab.1). Results: D+ required re-ET in a major number of occasion (24.7 vs 18%, p<0.043). In relation to VC, D+ showed a more severe calcium disease (grade 4C PACSS) (56 5 vs 7 8%) (χ=0 001) and a higher rate of mixed calcifications BTK (59 vs 9 5%) (χ=0 0001) while D- showed a higher involvement of intimal alone both ATK (57 9 vs 4 3%) (χ=0 0001) and BTK (34 2 vs 9%) (χ=0 027). Conclusions: Dialysis treatment increases dramatically the severity of PAD in diabetic subjects.(3) Our data confirmed that ET failure is higher in D+ and they needed more procedures to treat their condition. We retained that the VC could play a key role in the worse outcomes of dialysed patients. In fact these results seem to be related to the severity of VC in the vessels BTK, mainly to the simultaneous involvement both of intimal and medial layers. References [1] Prompers L, Diabetologia 2008; 51(5): 747–755, [2] Gershater MA, Diabetologia 2009; 52(3): 398–407. [3] Lepantolo M, Diabetes Metab Res Rev 2012; 28(Suppl 1): 40-45 Table 1. Proposed Fluoroscopy/DSA based Peripheral Arterial Calcification Scoring System (PACCS): intimal and medial vessel wall calcification at the target lesion site as assessed by high intensity fluoroscopy and digital subtraction angiography (DSA) assessed in AP projection. Grade 0: No visible calcium at the target lesion site Grade 1: unilateral calcification < 5 cm; a) intimal calcification; b) medial calcification; c) mixed type Grade 2: : unilateral calcification ≥ 5 cm; a) intimal calcification; b) medial calcification; c) mixed type Grade 3: bilateral calcification < 5 cm; a) intimal calcification; b) medial calcification; c) mixed type Grade 4: bilateral calcification ≥ 5 cm; a) intimal calcification; b) medial calcification; c) mixed type www.diabeticfoot.nl Page 11 of 11