A preoperative nomogram predicts prognosis of up front resectable patients with pancreatic head cancer and suspected venous invasion

BACKGROUND

Pancreatic head adenocarcinoma is commonly diagnosed at an advanced stage when adjacent vascular invasion is present. This study aimed to establish a preoperative prognostic nomogram for patients who underwent attempted curative resectional surgery for pancreatic head cancer with suspected peripancreatic venous invasion.

METHODS

Data on all consecutive patients were retrospectively collected from 2012 to 2016 at four academic institutions. The demographic and radiological parameters were analyzed using univariate and multivariate Cox regression analyses. The final nomogram was established using the concordance Harrell's C-indices and calibration curves from data obtained in three institutions and validated in the cohort of patients coming from the fourth institution.

RESULTS

The nomogram was constructed using data from 178 patients while the validation cohort consisted of 61 patients. Age, length of tumor contact, peripancreatic venous abnormalities and lymph node staging were independent factors of overall survival. The nomogram showed good probabilities of survival on calibration curves. The C-index of the model in predicting overall survival (OS) was 0.824 for the validation cohort.

CONCLUSIONS

The nomogram accurately predicted OS in patients with pancreatic head cancer with suspected peripancreatic venous invasion after attempted curative pancreatic resectional surgery.

Restoration of wall shear stress in the cephalic vein during extreme hemodynamics

The surgical creation of an artery-vein connection via a Brachicephalic fistula (BCF) in patients with end stage renal disease (ESRD) provides a unique opportunity to study blood vessel response mechanisms to extreme hemodynamic conditions in relatively short timeframes. After BCF creation, the flow rate in the vein increases by an order of magnitude leading to separated flows and corresponding abnormally low, or negative, wall shear stress (WSS) in the curved arch segment of the cephalic vein. Locations of abnormally low WSS are shown to correlate with development of neointimal hyperplasia (NH) and subsequent stenosis. It is found that the stenosis, prior to a surgical intervention, restores the normal physiological WSS in the vein. As a result, this investigation provides evidence that the adaptation principle, known to apply in the arterial system, is also valid in the venous system. A novel graphical method is developed that combines clinical and computational data to assist in interpreting these physiological mechanisms including adaptation that lead to changes in vein geometry over time.

Postoperative Ultrasound, Unassisted Maturation, and Subsequent Primary Patency of Arteriovenous Fistulas

BACKGROUND AND OBJECTIVES

Postoperative ultrasound is commonly used to assess arteriovenous fistula (AVF) maturation for hemodialysis, but its utility for predicting unassisted AVF maturation or primary AVF patency for hemodialysis has not been well defined. This study assessed the predictive value of postoperative AVF ultrasound measurements for these clinical AVF outcomes.

DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS

We queried a prospective vascular access database to identify 246 patients on catheter-dependent hemodialysis who underwent AVF creation between 2010 and 2016 and obtained a postoperative ultrasound within 90 days. Multivariable logistic regression was used to evaluate the association of clinical characteristics and postoperative ultrasound measurements with unassisted AVF maturation. A receiver operating characteristic curve estimated the predictive value of these factors for unassisted AVF maturation. Finally, multivariable survival analysis was used to identify factors associated with primary AVF patency in patients with unassisted AVF maturation.

RESULTS

Unassisted AVF maturation occurred in 121 out of 246 patients (49%), assisted maturation in 55 patients (22%), and failure to mature in 70 patients (28%). Using multivariable logistic regression, unassisted AVF maturation was associated with AVF blood flow (odds ratio [OR], 1.30; 95% confidence interval [95% CI], 1.18 to 1.45 per 100 ml/min increase; P<0.001), forearm location (OR, 0.37; 95% CI, 0.08 to 1.78; P=0.21), presence of stenosis (OR, 0.45; 95% CI, 0.23 to 0.88; P=0.02); AVF depth (OR, 0.88; 95% CI, 0.77 to 1.00 per 1 mm increase; P=0.05), and AVF location interaction with depth (OR, 0.50; 95% CI, 0.28 to 0.84; P=0.02). The area under the receiver operating characteristic curve, using all these factors, was 0.84 (95% CI, 0.79 to 0.89; P<0.001). Primary AVF patency in patients with unassisted maturation was associated only with AVF diameter (hazard ratio, 0.84; 95% CI, 0.76 to 0.94 per 1 mm increase; P=0.002).

CONCLUSIONS

Unassisted AVF maturation is predicted by AVF blood flow, location, depth, and stenosis. AVF patency after unassisted maturation is predicted only by the postoperative AVF diameter.

Factors Contributing to Morbidity after Combined Arterial and Venous Lower Extremity Trauma

The purpose of this study was to evaluate the impact of management of venous injury on clinical outcomes in patients with combined lower extremity arterial and venous trauma. Patients with common and external iliac, common and superficial femoral, and popliteal artery injuries were identified. Patients who underwent vein repair and those who received vein ligation were compared. The analysis was repeated for those patients who required secondary intervention for their arterial injury and those who did not require secondary intervention. Seventy patients were identified with both arterial and venous injuries: 40 underwent vein ligation and 30 received vein repair. There was no difference in ischemic time between patients undergoing vein repair compared with ligation. Vein ligation did not produce a higher incidence of muscle debridement (10% vs 15%, P = 0.72), necessity for secondary intervention (10% vs 7.5%, P = 0.99), or amputation (3.3% vs 7.5%, P = 0.63). Patients who required secondary intervention had a greater degree of shock on presentation (packed red blood cells (PRBC), 13 units vs 6 units, P = 0.02) and were more likely to require muscle debridement (50% vs 9%, P = 0.02) and amputation (33% vs 3%, P = 0.03). Vein ligation did not impact muscle ischemia or success of arterial repair in patients with combined venous and arterial trauma in the lower extremities. Patient morbidity after extremity vascular trauma is most related to degree of shock.

Endovascular Treatment for Venous Diseases: Where are the Venous Stents?

There is a growing need for dedicated endovascular devices to treat pathologies affecting the venous system. However, because of a lack of research into venous diseases and treatments, the optimal design, material, and mechanical properties of venous stents remain unknown. Development of the ideal venous stent should be based on a thorough understanding of the underlying venous pathology. There are multiple venous diseases that differ from each other depending on their location (iliocaval, superior vena cava), mechanism (thrombotic versus nonthrombotic lesions), and chronicity. Thus, it is likely that stent material, design, and features should differ according to each underlying disease. From a mechanical point of view, the success of a venous stent hinges on its ability to resist crushing (which requires high global and local radial rigidity) and to match with the compliant implant environment (which requires high flexibility). Device oversizing, textile coverage, and drug coating are additional features that should be considered in the context of venous diseases rather than directly translated from the arterial world. This review examines the unique forces affecting venous stents, the problems with using arterial devices to treat venous pathologies, preliminary results of a study comparing crush resistance of commercially available laser-cut stents with a novel braided stent design, and its applicability to venous interventions.

[Surgical treatment for lymphoedema]

Lymphoedema is a frequent condition after surgical treatment for breast cancer. Lymphoedema causes great discomfort for the patients and is primarily treated conservatively with compression garments and physical therapy. Recently, surgical interventions have gained popularity in the form of lympho-lymphatic anastomoses, lympho-venous anastomoses and autologous lymph node transplantation, either as stand-alone treatment or in combination with secondary breast reconstruction. In Denmark, lympho-venous anastomoses is currently the primary surgical treatment for lymphoedema.

Usefulness of venous catheter as an intraluminal stent for end-to-end venous anastomosis

BACKGROUND

Venous anastomosis is one of the most difficult techniques in vascular neurosurgery.

METHOD

We present a simple technique of end-to-end venous anastomosis for reconstruction of accidentally injured vein. A venous catheter was used for the stent during the end-to-end anastomosis.

RESULTS

The venous catheter as the stent facilitated confirmation of the ostium of the vein. The venous end-to-end anastomosis was successfully performed.

CONCLUSIONS

Accidental venous injury can be reconstructed with the present simple technique.

The Use of Lympho-Venous Anastomoses to Prevent Complications from Ilio-Inguinal Dissection

Lympho-venous anastomoses (LVA) were performed in 30 patients, immediately after the completion of ilio-inguinal dissection for metastatic nodal involvement. This surgical procedure, originally devised to treat post-mastectomy lymphedema from radical mastectomy, was intended in this series of cases to prevent complications from ilio-inguinal nodal dissection. Actually, when compared to another group of 84 patients previously operated on by ilioinguinal nodal dissection without lympho-venous anastomoses, the series showed a lower rate of local-regional complications (38% vs 65.9%). The mean duration of hospital stay was also reduced (18.5 vs 34.7 days). Distant lymphedema of the lower limb was observed in 7 of 23 patients who had received LVA, whereas in the control group, lymphedema was recorded in 39 of 52 patients who were regularly followed-up (30% vs 75%). LVA should be routinely used, as a useful surgical procedure, to prevent or reduce the occurrence of local-regional complications following ilio-inguinal nodal dissections.

Assessment of veins in T2*-weighted MR angiography predicts infarct growth in hyperacute ischemic stroke

BACKGROUND AND PURPOSE

T2*-weighted magnetic resonance angiography (SWAN) detects hemodynamic insufficiency as hypointense areas in medullary or cortical veins. We therefore investigated whether SWAN can help predict ischemic penumbra-like lesions in patients with acute ischemic stroke (AIS).

MATERIALS AND METHODS

Magnetic resonance imaging (MRI) records-including SWAN, diffusion-weighted imaging (DWI), and magnetic resonance angiography (MRA)-of consecutive patients with major vessel occlusion within 6 h from AIS onset were analyzed. Acute recanalization was defined as an arterial occlusive lesion score of 2-3. A modified Alberta Stroke Program Early CT Score (mASPECTS) was used to evaluate ischemic areas revealed by SWAN and DWI. SWAN- and DWI-based mASPECTSs were calculated, and correlations between DWI-SWAN mismatches with final infarct lesions or clinical outcomes were evaluated.

RESULTS

Among the 35 patients included in this study, we confirmed cardioembolic stroke in 26, atherothrombotic stroke in 4, and unknown stroke etiology in 5. Overall, recanalization was achieved in 23 patients, who showed a higher follow-up DWI-based mASPECTS and lower modified Rankin Scale (mRS) score at 90 days than patients without recanalization. Initial SWAN- and follow-up DWI-based mASPECTSs were significantly higher for atherothrombotic stroke than for cardioembolic stroke. Of 12 patients without recanalization, DWI-SWAN mismatch was significantly correlated with infarct growth. Patients with recanalization showed no such correlation. In the assessment of clinical outcome, follow-up DWI-based mASPECTS and patient's age were significantly correlated with mRS at 90 days after stroke. A multivariate logistic regression analysis revealed that the follow-up DWI-based mASPECTS was independently associated with a favorable outcome 90 days after stroke.

CONCLUSIONS

For patients with AIS, DWI-SWAN mismatch might show penumbra-like lesions that would predict infarct growth without acute recanalization. Assessment of ischemic lesions from the venous side appears to be useful for considering the etiology and revascularization therapy.

[Microsurgical subinguinal varicocelectomy with delivery of the testis and ligation of gubernacular veins: Evaluation of clinical effects]

OBJECTIVE

To compare the clinical effects and postoperative complications of microsurgical subinguinal varicocelectomy (MSV) with or without delivery of the testis and ligation of gubernacular veins in the treatment of varicocele.

METHODS

We retrospectively analyzed the clinical data about 163 varicocele patients treated by MSV, 40 with (group A) and the other 123 without delivery of the testis and ligation of gubernacular veins (group B). We compared the operation time, postoperative complications, rate of recurrence, and semen parameters before and at 3 months after surgery between the two groups of patients.

RESULTS

The operation time was significantly longer in group A than in B (［81.1 ± 20.0］ vs ［62.3 ± 9.6］ min, P = 0.041). Sperm concentration, total sperm count per ejaculate, sperm viability, and the percentage of progressively motile sperm were significantly improved in both groups at 3 months after MSV as compared with the baseline (P < 0.05). There were no statistically significant differences in the above semen parameters between the two groups of patients with grade Ⅲ varicocele before and after surgery (P < 0.05). Scrotal edema developed in 5 cases in group A and wound infection in 2 cases in group B after MSV, but no postoperative testicular atrophy or recurrence was observed in either of the two groups.

CONCLUSIONS

MSV with delivery of the testis and ligation of gubernacular veins showed no advantages over that without in reducing varicocele recurrence and improving semen parameters, but rather involved longer operation time and a higher incidence rate of postoperative complications.

Modified Inguinal Microscope-Assisted Varicocelectomy under Local Anesthesia: A Non-randomised Controlled Study of 3565 Cases

Varicocele is a common abnormality, but the conventional microsurgical subinguinal varicocelectomy (CMSV) has some disadvantages. We invented Modified Inguinal Microscope-Assisted Varicocelectomy (MIMV) under local anesthesia. This study aims to evaluate MIMV by comparing it to CMSV in operating duration, time to return to normal activity, postoperative complications, achievement of natural pregnancy and improvement of semen quality for patients with infertility, pain score for those with scrotal pain, and so on. We enrolled 3089 patients who underwent MIMV and 476 who underwent CMSV in our hospital. Both the operating duration and the time to return to normal activity of MIMV was shorter than that of CMSV (P < 0.001). The recurrence rate (P < 0.001) and injury rate of vas deferens (P = 0.011) after MIMV were lower than that after CMSV. Moreover, patients with MIMV showed higher degree of satisfaction with the surgery experience and outcome than those with CMSV (P < 0.001). However, no statistical difference was found between the two groups in scores of pain due to surgery, postoperative varicose veins diameters, reflux duration, and the postoperative complications of wound infection, hydrocele, atrophy of testis, epididymitis, and scrotal hematoma. In summary, MIMV is a promising varicocelectomy and could be applied more in clinical practice.

Lymphedema: Pathogenesis and Novel Therapies

Lymphedema affects up to 1 in 6 patients who undergo treatment for a solid tumor in the United States. Its prevalence has increased as more effective oncologic therapies have improved patient survival, but there remains no definitive cure. Recent research has elucidated new details in the pathogenesis of the disease and has demonstrated that it is fundamentally an immunologic process that ultimately results in inflammation, fibroadipose deposition, impaired lymphangiogenesis, and dysfunctional lymphatic pumping. These findings have allowed for the development of novel medical and surgical therapies that may potentially alter the standard of care for a disease that has largely been treated by compression. This review seeks to provide an overview of the emerging therapies and how they can be utilized for effective management of lymphedema.

The brachio-brachial arteriovenous fistula: a new method in patients without a superficial venous system in the upper limb

Purpose

This study aimed to report our experience in the creation of brachio-brachial arteriovenous fistulas (AVFs) in patients without adequate superficial venous circulation at the upper limb.

Methods

A retrospective study of 33 patients, operated on between 2004–2005, in whom we created a brachio-brachial fistula between the brachial artery and the brachial vein. After dissection and adequate mobilization, the brachial vein was anastomized to the brachial artery in an end-to-side fashion. After the maturation period (1 month) the brachial vein was transposed into the subcutaneous tissue.

Results

Thirty-three patients underwent 33 brachio-brachial fistula constructions. Primary patency was achieved in all patients. After 1 month, 27 fistulas (81.8%) were functional. Six patients developed fistula occlusion. The 27 remaining patients had subsequently good fistulas for hemodialysis (HD) afterwards. Discrete edema of the forearm was noted in 12 patients (36%); in one of these patients the edema was extended to the entire arm. No other complications were noted. A follow-up study, extended from 3–26 months (mean 14 ± 6.6 months), was performed. The overall patency rate of the brachio-brachial fistula at the end of the follow-up was 85.2%.

Conclusions

The brachio-brachial fistula can represent a viable choice in patients with an inadequate superficial venous system in the upper limb.

Impact of pre-operative venography on the planning and outcome of vascular access for hemodialysis patients

Objective

Pre-operative venous mapping has increased dramatically in most dialysis units since the Dialysis Outcome Quality Initiative (DOQI) guidelines recommended a native arteriovenous venous fistula (AVF) rather than a graft for hemodialysis (HD) access procedures. However, there are conflicting consequences as a result of this policy. Some studies have showed that routine mapping has resulted in a marked increase in maturation rate while others have observed the reverse. This study aimed to evaluate the impact of pre-operative venography on the planning and outcome of AVF for our HD patients.

Patients and methods

A prospective study was performed on all patients with end-stage renal disease (ESRD) who had HD access procedures and pre-operative venography between October 2003 and November 2005. Upper limb venography was done for all patients except those that required primary access and had visible veins. All patients had HD immediately after the venography. Access procedure selection was based on the result of the venography. The complications of venography, the surgical procedure and the outcome were recorded.

Results

One hundred and twenty-nine patients with ESRD who had pre-operative venography were included in this study. They were mostly middle age (mean age ± SD = 41 ± 15.5 yrs) with a high rate of diabetes mellitus (53%). No single complication was reported. A graft was placed in six patients (5%) only. Unsuccessful surgical exploration was 0%. Early failure was in 10 patients (8%).

Conclusion

Pre-operative venography resulted in an increase in the number of AVFs. It can improve the results of HD access procedures by selecting the most suitable veins.

A new technique for autogenous brachiobasilic upper arm transposition for vascular access for hemodialysis

Purpose

Conventional brachiobasilic fistula creation consists of the mobilization and preparation of the brachial part of the basilic vein along its whole length, the vein transposition on the anterior surface of the arm and anastomosis using the brachial artery. In case of late thrombosis, the reparation of such a fistula is almost impossible.

Methods

To avoid total vein clotting in the case of thrombosis we decided to prepare only a short part of the vein in our method and not to mobilize the other part of the vein. The brachiobasilic fistula with our modification was performed as a two-stage procedure in 18 patients (8 females and 10 males), aged from 37–78 yrs (60 ± 13.6 yrs).

Results

In two patients early thrombosis occurred. The reparation procedure was not performed in two patients (the first patient died due to pneumonia; the second patient did not give his permission for further intervention). In 16 patients brachiobasilic fistula creation was successful. Late thrombotic complications occurred in three patients (in the 3rd, 8th and 12th months). A new successful fistula, a few centimeters proximally to the original one, was performed in 2 patients 24hr and in 1 patient 48hr after fistula clotting. On the following day after the procedure the fistula was ready to be used. The primary, assisted primary and cumulative secondary patency rates after 12 months of follow-up were 74, 89 and 100%, respectively.

Conclusion

In comparison with standard brachiobasilic techniques our method offers the possibility of a reparation procedure in the case of late thrombosis, which could improve the long-term patency of brachiobasilic fistulas. However, a prospective controlled study is necessary to establish if this new technique is superior to the traditional surgical procedure.

Decreasing and preventing lymphatic-injury-related complications in patients undergoing venous surgery: A new diagnostic and therapeutic protocol

Lymphatic complications following great and small saphenous vein surgery show a varying and non-negligible incidence in the literature. We undertook this study to investigate a new protocol to reduce lymphatic injuries in patients undergoing venous surgery. Eighty-six patients with lower limb venous insufficiency and varices were treated. Lymphoscintigraphy was performed preoperatively in 65 of them and postoperatively in 19. Blue dye was used in all patients and blue lymph nodes and lymphatics were identified intra-operatively and preserved or used to perform multiple lymphatic-venous anastomoses (MLVA). Patients were followed up fora period varying from 3 months to 6 years. Sixty-six patients were treated by greater saphenectomy and varicectomy, 12 patients had crossectomy and varicectomy, 4 patients underwent greater saphenectomy and varicectomy associated with MLVA, and 4 patients were treated by small saphenous vein stripping and varicectomy. No lymphatic complications occurred in any of the patients. A decrease of over 75% of excess volume was observed in 4 patients treated by MLVA. Lymphoscintigraphy showed normalization in the Transport Index in 4 patients treated with MLVA. Our results demonstrate that accurate diagnostic investigation and proper surgical technique is of paramount importance in the effort to avoid lymphatic complications during venous surgery.

[Microscopic spermatic vein ligation for the treatment of varicocele]

OBJECTIVE

To explore the effect of spermatic vein ligation under the microscope in the treatment of varicocele (VC).

METHODS

A total of 120 VC patients received in our department from September 2011 to February 2015 were randomly divided into an experimental and a control group of equal number, the former treated by microscopic spermatic vein ligation and the latter by conventional open high ligation. Comparisons were made between the two groups of patients in the internal diameters of the spermatic vein during eupnea and Valsalva maneuver, the reflux time of the spermatic vein, blood flow parameters of the testicular artery, and semen quality before and at 3 months after surgery.

RESULTS

At 3 months after surgery, the experimental group, as compared with the control, showed significantly decreased reflux time of the spermatic vein (［0.41 ± 0.10］ vs ［1.08 ± 0.10］ s, P <0.05) and peak systolic velocity (9.26 ± 1.35 vs 10.64 ± 1.28, P <0.05) and resistance index (0.52 ± 0.03 vs 0.61 ± 0.03, P <0.05) of the testicular artery but markedly increased internal diameters of the spermatic vein during eupnea (［1.63 ± 0.07］ vs ［1.59 ± 0.06］ mm, P <0.05) and Valsalva maneuver (［1.72 ± 0.05］ vs ［1.68 ± 0.07］ mm, P <0.05), sperm concentration (［46.84 ± 5.24］ vs ［35.35 ± 4.26］ ×10⁶/ml, P <0.05), sperm motility (［63.75 ± 7.73］ vs ［53.87 ± 6.46］ %, P <0.05), and total sperm count (［89.54 ± 7.95］ vs ［75.24 ± 8.43］ ×10⁶/ml, P <0.05).

CONCLUSIONS

Microscopic spermatic vein ligation has a definite effect in the treatment of varicocele, which can significantly improve the testicular blood flow and semen quality of the patient.

[Laparoscopic extraperitoneal high ligation of the spermatic vein for the treatment of varicocele]

OBJECTIVE

To investigate the effect of laparoscopic extraperitoneal (LSEP) high ligation of the spermatic vein in the treatment of varicocele.

METHODS

We retrospectively analyzed the clinical data about 80 cases of varieocele, 48 treated by LSEP and the other 32 by laparoscopic transabdominal retroperitoneal (LSTR) high ligation of the spermatic vein. We recorded the semen parameters before and at 1, 3 and 6 months after surgery, intraoperative blood loss, operation time, postoperative complications, time of gastrointestinal function recovery and rate of pregnancy, followed by comparison of the data obtained between the two groups of patients.

RESULTS

Semen parameters were remarkably improved in both the LSEP and LSTR groups of patients postoperatively as compared with the baseline (P <0.05), but with no statistically significant difference at different postoperative months (P >0.05). The intraoperative blood loss was less in the LSEP than in the LSTR group (［8.3 ± 5.2］ vs ［9.1 ± 6.1］ ml, P >0.05), the operation time was shorter in the former than in the latter (［38.27 ± 9.23］ vs ［43.46 ± 11.72］ min, P >0.05), and so was the time of gastrointestinal function recovery (［1.27 ± 0.26］ vs ［2.43 ± 0.41］ d, P <0.05). No statistically significant differences were observed between the two groups during the 6- to 18-month follow-up in the rates of postoperative subcutaneous hematoma, scrotal and subcutaneous emphysema, recurrence, or pregnancy (P >0.05).

CONCLUSIONS

Laparoscopic extraperitoneal high ligation of the spermatic vein is safe and effective and has the advantage of quick recovery in the treatment of varicocele.

A randomised controlled trial comparing venous stenting with conservative treatment in patients with deep venous obstruction: research protocol

INTRODUCTION

Deep venous obstruction (DVO) has a great impact on quality of life (QoL) comparable to angina pectoris or chronic pulmonary disease. Post-thrombotic scar formation and May-Thurner syndrome (MTS) are the most common causes of DVO. Conventional treatment of DVO focuses on reducing pain or leg swelling by use of (pain) medication and therapeutic elastic stockings. In the past, a venous bypass was offered in severe post-thrombotic cases, but this procedure showed bad clinical and patency outcomes. With the introduction of percutaneous angioplasty and dedicated venous stents new opportunities were created. Deep venous stenting has been shown to be effective in retrospective case series. However, there is no prior research in which QoL after interventional treatment is compared with QoL after conventional treatment. Currently, there is a debate about the true additional value of interventional treatment. We investigate whether those patients who are treated with stenting experience a change in short form 36 (SF-36) and the Veines-QoL/Sym questionnaires compared with conventionally treated patients.

METHODS AND ANALYSIS

This is a randomised trial comparing conservative deep venous management to interventional treatment. A total of 130 patients with post-thrombotic syndrome (PTS) or MTS, eligible for interventional percutaneous treatment, who did not have previous deep venous intervention will be included. Patients will be randomised to conservative treatment or venous stenting and stratified for the PTS or MTS subgroup. Conservative treatment consists of either one or a combination of pain medications, manual lymphatic drainage, compression stockings and regular post-thrombotic anticoagulant therapy.The primary outcome is the QoL change after 12 months compared with baseline QoL. Secondary outcomes are QoL changes at 6 weeks, clinical assessment of DVO, recurrence rate of deep venous thrombosis at 6 weeks and 12 months, and the total amount of working days lost. Intervention-specific outcomes include complications and patency.

ETHICS AND DISSEMINATION

The protocol is approved by the Medical Ethics Committee of Academisch ziekenhuis Maastricht/Universiteit Maastricht, The Netherlands (protocol number NLNL55641.068.15 / METC 161008).We aim to publish the results of this study in a peer reviewed journal and present our findings at national or international conferences.

TRIAL REGISTRATION NUMBER

The study protocol was registered at www.clinicaltrials.gov (registration number: NCT03026049) on 17 January 2017.

[Redo Off-pump Coronary Artery Bypass for Postoperative Vein Graft Stenosis of Anomalous Origin of the Left Coronary Artery from the Pulmonary Artery;Report of a Case]

Bland-White-Garland (BWG) syndrome (anomalous origin of the left coronary artery from the pulmonary artery) is a rare disease which may result in myocardial infarction, congestive heart failure or sometimes death during the early infantile period. We present a 57-year-old female with BWG syndrome. At the age of 20, she was diagnosed with BWG syndrome and underwent coronary artery bypass grafting of a saphenous vein to the proximal portion of the anterior descending branch of the left coronary artery and ligation of the anomalous artery. Thirty-seven years later, she presented with symptoms of angina pectoris and congestive heart failure. Coronary angiography (CAG) revealed stenosis of the saphenous vein graft. Bare metal stent implantation for the saphenous vein graft was performed, but at the 6 months' follow-up CAG revealed restenosis. Drug-eluting stent was then implanted, but in-stent restenosis recurred 4 months later. We performed off-pump coronary artery bypass grafting to the left anterior descending artery using the left internal thoracic artery. The postoperative course was uneventful.

[Microsurgical bypass for varicocele with nutcracker syndrome]

OBJECTIVE

To investigate the clinical effect and feasibility of internal spermatic vein-inferior epigastric vein (ISV-IEV) bypass surgery in the treatment of varicocele complicated by left renal vein nutcracker syndrome (NCS).

METHODS

We retrospectively analyzed the clinical data about 30 cases of varicocele with left renal vein NCS treated by ISV-IEV bypass surgery in our hospital from June 2014 to February 2017. We reviewed the follow-up data and results of ultrasonography, routine urianlysis and semen routine examination.

RESULTS

All the operations were successfully accomplished and postoperative color Doppler ultrasonography showed that varicocele was cured in all the cases. At 6 months after surgery, sperm concentration and the percentage of grade a+b sperm were significantly improved (［34.47 ± 8.60］ ×10⁶/ml and ［63.54% ± 9.58］ %) as compared with the baseline (［19.90 ± 8.97］ ×10⁶/ml and ［37.93 ± 8.73］ %) (P <0.05). Hematuria was cured in 23 and alleviated in 1 of the 24 cases. Proteinuria disappeared in all the 14 cases, with neither scrotal pain symptoms nor obvious complications.

CONCLUSIONS

ISV-IEV bypass surgery, with its advantages of safety, effectiveness, minimal invasiveness, and simple operation, deserves wide clinical application in the treatment of varicocele with left renal vein NCS.

[Microscopic spermatic vein ligation for nutcracker phenomenon complicated with left varicocele]

OBJECTIVE

To investigate the clinical effect of microscopic spermatic vein ligation in the treatment of nutcracker phenomenon (NCP) complicated with left varicocele (VC).

METHODS

This retrospective study included 31 cases of NCP complicated with left VC treated in our hospital by subinguinal microscopic ligation of the left spermatic vein (group A, n = 11), open retroperitoneal high ligation of the left spermatic vein (group B, n = 11), or conservative therapy (group C, n = 9). The patients were followed up for 6－24 (15.3 ± 5.4) months. We compared the semen parameters, spermatic vein diameter, left testis volume, and recurrence rate among the three groups of patients before and after treatment.

RESULTS

Compared with the baseline, the semen quality parameters were significantly improved in both groups A and B at 6 months after treatment (P<0.05) but reduced in group C (P<0.05); the spermatic vein diameter at rest and that at Valsalva maneuver were markedly decreased in groups A (［2.53 ± 0.27］ vs ［1.84 ± 0.22］ and ［3.53 ± 0.19］ vs ［2.16 ± 0.25］ mm, P<0.05) and B (［2.62 ± 0.33］ vs ［2.15 ± 0.43］ and ［3.36 ± 0.25］ vs ［2.44 ± 0.27］ mm, P<0.05) but increased in group C (［2.56 ± 0.28］ vs ［2.94 ± 0.24］ and ［3.33 ± 0.21］ vs ［3.77 ± 0.26］ mm, P<0.05). No statistically significant differences were found in the left testis volume at 6 months after treatment in group A (［9.85 ± 1.86］ vs ［10.27 ± 1.18］ ml, P>0.05), B (［9.77 ± 2.03］ vs ［9.96 ± 1.72］ ml, P>0.05), or C (［9.83 ± 1.59］ vs ［10.48 ± 2.05］ ml, P>0.05), nor in the recurrence rate between groups A and B (P>0.05).

CONCLUSIONS

Hematuria, proteinuria and other mild symptoms of nutcracker phenomenon complicated with left VC can be treated palliatively by microscopic ligation of the spermatic vein, which can relieve the clinical symptoms, improve the semen quality, and protect the testicular function of the patient.

[Establishment of a penile transplantation model in beagle dogs]

OBJECTIVE

To investigate the feasibility of establishing a model of allograft penile transplantation in adult beagle dogs and explore the conditions for constructing a stable animal model of penis transplant.

METHODS

Following the principles of similarity, repeatability, feasibility, applicability, and controllability in the construction of experimental animal models, we compared the major anatomic features of the penis of 20 adult beagle dogs with those of 10 adult men. Using microsurgical techniques, we performed cross-transplantation of the penis in the 20 (10 pairs) beagle dogs and observed the survival rate of the transplanted penises by FK506+MMF+MP immune induction. We compared the relevant indexes with those of the 10 cases of microsurgical replantation of the amputated penis.

RESULTS

High similarities but no statistically significant differences were observed in penile anatomic features between the 20 beagle dogs and 10 men. All the 10 cases of cross-transplantation of the penis were successfully completed in the 20 beagle dogs, of which the transplanted glans survived with normal micturition in 12 but developed necrosis in the other 8; the success rate of one-time venous anastomosis was 95.0% (38/40) and that of one-time arterial anastomosis was 87.5% (35/40), with an average vascular anastomosis time of (71.0±9.0) minutes, a mean operation time of (133.0±10.3) minutes, and a mean blood loss of (135.8±41.4) ml. In the 10 cases of penile replantation, the success rate of one-time venous anastomosis was 100% (20/20) and that of one-time arterial anastomosis was 90.0% (18/20), with an average vascular anastomosis time of (65.0±7.9) minutes, a mean operation time of (117.4±10.0) minutes, and a mean blood loss of (85.0±10.8) ml. In the 12 cases of replantation of the amputated penis, the success rate of one-time venous anastomosis was 100% (24/24) and that of one-time arterial anastomosis was 95.8% (23/24), with an average vascular anastomosis time of (79.0±17.6) minutes, a mean operation time of (125.0±20.6) minutes, and a mean blood loss of (140.0±44.3) ml. No statistically significant differences were found in the relevant indexes among the three groups.

CONCLUSIONS

The anatomic structure of the corpus cavernosum penis of beagle dogs is highly similar to that of men, almost the same in cross-section anatomy. Microsurgical replantation and allograft transplantation of the penis were both successfully performed in beagle dogs, which showed similar operative indexes to those of human penile replantation. The construction of the allograft penile transplantation model in adult beagle dogs is feasible clinically, with the advantages of operability and repeatability.