Comparison of venous and HePTFE tibial and peroneal bypasses in critical limb ischemia patients unsuitable for endovascular revascularization.

BACKGROUND: We examined short- and long-term outcomes of tibial and peroneal venous and heparin-bonded expanded polytetrafluoroethylene bypasses in patients with critical limb ischemia who were unsuitable for endovascular revascularization. METHODS: A retrospective analysis was done for all patients who underwent tibial and peroneal bypass surgery in our department between October 2007 and October 2012. Vein was the preferred graft material and used whenever possible. RESULTS: One hundred and ninety-eight crural grafts were included. Indications for the surgery were rest pain (30.3%) or ulcer or gangrene (69.7%). Autologous veins were used in 109 cases (vein group) and heparin-bonded expanded polytetrafluoroethylene grafts were used in 89 cases (heparin-bonded expanded polytetrafluoroethylene group). At three years, primary patency for the vein group was 68.2% versus 34.1% for the heparin-bonded expanded polytetrafluoroethylene group (P = .000) and secondary patency was 69.8% versus 35.5% (P = .001). Limb salvage was 81.8% for the vein group versus 56.5% for the heparin-bonded expanded polytetrafluoroethylene group (P = .000) and survival was 62.8% versus 46.7% (P = .019). CONCLUSIONS: The results of our study show that autologous vein grafts are still first choice for tibial and peroneal bypasses in patients with critical limb ischemia. If no adequate vein is available, heparin-bonded expanded polytetrafluoroethylene bypasses are an acceptable alternative to an otherwise impending major amputation.

Colorimetric examination of typical free flap donor sites and comparison to recipient sites in the extremities.

Results after free flap reconstruction in the extremities are often impaired by missing color match of the transferred flap and the recipient site. But pre-existing color match is the precondition for satisfying aesthetic results. To obtain suitable free flap donor sites in terms of color for extremity reconstruction and to understand frequent color mismatch, we performed a colorimetric study including 60 healthy volunteers. Ten free flap donor sites were compared with ten recipient sites in the extremities. The results of our study showed that lower extremity sites are markedly lighter than upper extremity sites with the exception of the palmar forearm. We encountered an excellent color match of the radial forearm flap to the back of the hand (4.10 ± 1.91) and the palm of the hand (5.62 ± 2.21), and significantly relevant color match to the palmar aspect of the forearm (2.52 ± 1.23). Additionally, the lateral arm flap showed a remarkable color match to the dorsal aspect of the forearm (3.13 ± 2.06). Furthermore we encountered significantly relevant color match of the fibula flap to the anterior aspect of the lower leg (2.01 ± 1.08) and excellent color match of the anterolateral thigh flap (ALT) to the palmar aspect of the forearm (3.66 ± 2.10). No further significantly relevant color differences between the other donor sites and recipient regions were found. Colorimetric measurements are a helpful tool in reconstructive surgery to compare skin color of different anatomic sites.

The efficacy of color duplex sonography in preoperative assessment of anterolateral thigh flap.

The anterolateral thigh (ALT) flap has become a workhorse in reconstructive surgery of the head and neck region and the extremities. However, its inconsistent vascular anatomy and frequent intramuscular course of perforators often cause difficulties during the dissection of this versatile flap. Hence, reliable preoperative perforator mapping and identification of vascular anomalies may render the raising of the flap easier and safer. The aim of this study was to evaluate the use of Color Duplex sonography and whether it allows the distinction between septocutaneous and musculocutaneous perforators. For this purpose, the thighs of 13 patients undergoing reconstruction with ALT flaps were examined preoperatively, and results were compared to intraoperative findings. A total of 30 perforators could be detected preoperatively, of which 29 were confirmed during flap dissection. Preoperative Color Duplex sonography correctly predicted the course of all perforators as either running through the vastus lateralis muscle or the intermuscular septum. In our investigations, Color Doppler sonography had a 96.7% positive predictive value and a 96.7% true positive rate in detecting perforators. Color Duplex sonography is a highly reliable tool in the preoperative assessment of ALT flaps. Localization and course of perforators can be determined accurately and vascular anomalies can be identified.

Alert for increased long-term follow-up after carotid artery stenting: results of a prospective, randomized, single-center trial of carotid artery stenting vs carotid endarterectomy.

BACKGROUND: Carotid endarterectomy (CEA) has been shown to be effective in stroke prevention for patients with symptomatic or asymptomatic carotid artery stenosis. Although several prospective randomized trials indicate that carotid artery stenting (CAS) is an alternative but not superior treatment modality, there is still a significant lack of long-term data comparing CAS with CEA. This study presents long-term results of a prospective, randomized, single-center trial. METHODS: Between August 1999 and April 2002, 87 patients with a symptomatic high-grade internal carotid artery stenosis (>70%) were randomized to CAS or CEA. After a median observation time of 66 +/- 14.2 months (CAS) and 64 +/- 12.1 months (CEA), 42 patients in each group were re-evaluated retrospectively by clinical examination and documentation of neurologic events. Duplex ultrasound imaging was performed in 61 patients (32 CAS, 29 CEA), and patients with restenosis >70% were re-evaluated by angiography. RESULTS: During the observation period, 23 patients (25.2%) died (10 CAS, 13 CEA), and three were lost to follow up. The incidence of strokes was higher after CAS, with four strokes in 42 CAS patients vs none in 42 CEA patients. One transient ischemic attack occurred in each group. A significantly higher rate of restenosis >70% (6 of 32 vs 0 of 29) occurred after CAS compared with CEA. Five of 32 CAS patients (15.6%) presented with high-grade (>70%) restenosis as an indication for secondary intervention or surgical stent removal, and three presented with neurologic symptoms. No CEA patients required reintervention (P < .05 vs CAS). A medium-grade (<70%) restenosis was detected in eight of 32 CAS patients (25%) and in one of 29 CEA patients (3.4%). In five of 32 CAS (15.6%) and three of 29 CEA patients (10.3%), a high-grade stenosis of the contralateral carotid artery was observed and treated during the observation period. CONCLUSION: The long-term results of this prospective, randomized, single-center study revealed a high incidence of relevant restenosis and neurologic symptoms after CAS. CEA seems to be superior to CAS concerning the development of restenosis and significant prevention of stroke. However, the long-term results of the ongoing multicenter trials have to be awaited for a final conclusion.