Intrathoracic Inferior Vena Cava Research Articles

En-Bloc Resection of Renal Cell Carcinoma With Tumor Thrombus Propagating Into the Intrapericardial Inferior Vena Cava: Efficacy and Safety of Transabdominal Approach.

Renal cell carcinoma (RCC) is the most common primary kidney cancer. In up to 4-10% of patients, the tumor is complicated with a malignant thrombus extending to the inferior vena cava (IVC). Complete surgical excision of the RCC and the neoplastic thrombus can be curative. We aim to present a safe and feasible alternative transabdominal operative technique with the omission of thoracotomy, as applied in six patients diagnosed with RCC and IVC thrombus extending over the diaphragm. This case series study was conducted in a tertiary university hospital in Athens, Greece. All six patients, who were operated on for RCC and a malignant thrombus exceeding in the intrapericardial IVC in our department from January 2009 until March 2020, were screened. Intraoperatively, the infrarenal and intrapericardial IVC were clamped simultaneously with the renal and liver blood inflow. Access to the intrapericardial IVC was obtained via the central tendon of the diaphragm. Intrathoracic extension of the tumor was confirmed by transesophageal or intraoperative ultrasonography. The intrathoracic IVC was exposed to direct vision and two finger palpation was applied to secure the clamping of the IVC above the tip of the thrombus. The tumor was resected through a longitudinal venotomy and the operation was completed on a standard radical nephrectomy. During the study period six patients presented with RCC and intrapericardial IVC thrombus. All patients, five female and one male, underwent radical nephrectomy combined with IVC thrombectomy, without the need for a thoracotomy. The mean age was 66 years old and the mean operative time was 122.5 minutes. Mean blood loss was 338 ml and only four of the patients were transfused with two units of RBC. Operative and hospital mortality was 0%. The hospital stay was seven (six to nine) days. Only one patient required readmission and reoperation 30 days later, due to intrapericardial herniation. The proposed surgical technique may be curative in patients with advanced intracaval thrombus and helps reduce the associated morbidity, mortality, and the overall cost of more extended operations.

Blood Circuit Reconstruction in an Abdominal Mouse Heart Transplantation Model.

The surgical technique of heterotopic abdominal heart transplantation in mice is a standard model for research in transplantation immunology. Here, the established technique for a modified blood circuit reconstruction in a heterotopic abdominal heart transplantation model is presented. This method uses the intrathoracic inferior vena cava (IIVC) instead of the pulmonary artery of the donor heart for the anastomosis to the inferior vena cava of the recipient. It is facilitating and improving success rates for abdominal heart transplantation in mice.

Tissue‐engineered Vascular Grafts for Congenital Heart Surgery

ObjectiveWe developed a tissue engineered vascular graft (TEVG) formed by seeding autologous bone marrow‐derived mononuclear cells onto a biodegradable tubular scaffold fabricated from a knitted polyglycolic acid core and coated with a 50:50 copolymer of poly lactic acid and polycaprolactone. Once implanted, the scaffold degrades and neotissue forms giving rise to neovessel which is structurally and functionally similar to the native vessel into which it was implanted. Herein we will describe the natural history of the evolution of the mechanical properties of the TEVG after implantation and evaluate the impact of the mechanical properties of the TEVG on graft performance.MethodsWe utilized an ovine intrathoracic inferior vena cava model in order to evaluate the evolving mechanical properties of the TEVG and determine their impact on graft performance. We implanted TEVG into 24 juvenile lambs and serially assessed graft morphometry and function using serial angiography and intravascular ultrasound (IVUS) over a 6 ‐month to 1‐year period. We serially measured changes in graft size using both angiography and IVUS. We also assessed the graft hemodynamics at angiography. We measured graft displacement over both the cardiac and respiratory cycle. Finally, a subset of TEVGs were harvested and underwent biaxial mechanical testing.ResultsThe TEVG undergoes significant remodeling when after implantation. As the scaffold degrades, the TEVG transforms from a relatively stiff conduit to a highly compliant neovessel with growth capacity.ConclusionsThe transformation of the TEVG from a relatively stiff vascular conduit to a more compliant neovessel enables the graft to function as a capacitance vessel improving its performance when used in the venous circulation.Support or Funding InformationNIH R01HL139796

Management of Bullet Emboli to the Heart and Great Vessels.

Firearm-related injuries account for 20% of all injury-related deaths and are responsible for 105,000 injuries annually. The occurrence of bullet emboli to the heart is exceedingly rare. Given the rarity of emboli, controversy exists over management. The primary endpoint of this study is to establish a management algorithm for venous bullet emboli to the heart. A literature search was performed using PubMed and Google Scholar with the following search terms: cardiac bullet embolus, cardiac missile embolus, and bullet embolus. Any discoverable case report(s) or series after 1960 were included in the review. The following data points were collected: age, sex, presentation, imaging, foreign body entry site, foreign body destination site, management, and outcomes. Fifty-four articles met our search criteria. A total of 62 patients with thoracic venous bullet emboli were identified with the following distributions: right atrium (9.7%), right ventricle (54.8%), pulmonary arterial tree (32.3%), and intra-thoracic inferior vena cava (3.2%). Only 11.3% of patients had symptoms directly related to the cardiac venous emboli; however, all patients with acute symptoms underwent immediate intervention. Of those patients with bullet emboli to the pulmonary arterial tree, 45% were observed; whereas, only 20% with emboli to the right heart were observed. Those without signs or symptoms usually underwent an intervention (72.7%). Endovascular retrieval was successful in 53% of attempts. Of the endovascular attempts that failed, 28.6% were observed and 71.4% underwent open retrieval. Those who were asymptomatic and observed had no reported adverse sequelae during the follow-up. No mortalities were discovered in this review. Bullet emboli can prove to be a clinical challenge. Adjuncts such as X-ray, computed tomography, transthoracic, and/or transesophageal echocardiography help establish the emboli location. While observation in the asymptomatic patient is reasonable in some circumstances, most patients undergo removal. Removal of bullet cardiac emboli is safe with the availability of modern techniques.

Outcomes of surgery for hepatocellular carcinoma with tumor thrombus in the inferior vena cava or right atrium.

The prognosis of hepatocellular carcinoma (HCC) patients with tumor thrombus (TT) in the inferior vena cava (IVC) or right atrium (RA) is extremely poor. We reviewed the recent surgical treatments and outcomes of this form of advanced HCC. TT is classified into three types according to its anatomic location relative to the heart: the inferior hepatic type (type I), where the TT is in the IVC below the diaphragm; the superior hepatic type (type II), where the TT is in the IVC above the diaphragm, but still outside the RA; and the intracardiac type (type III), where the TT is above the diaphragm and has entered the RA. Type I can be treated relatively easily by standard radical hepatectomy. For type II, the intrathoracic IVC is approached via the abdominal cavity and an incision in the diaphragm with total hepatic vascular exclusion (THVE). For type III, hepatectomy plus thrombectomy is generally performed under cardiopulmonary bypass. If the TT is only just inside the RA, THVE can be performed by mobilizing the liver caudally. The median overall survival of HCC patients with TT in the IVC or RA, who undergo curative resection, is 19.0-30.8months. As postoperative recurrence is likely to develop, even after curative surgery, effective postoperative adjuvant chemotherapy is required.

An approach to the intra-thoracic inferior vena cava through the abdominal cavity preparing for total hepatic vascular exclusion by sagittal diaphragmotomy.

For resection of advanced liver tumors with tumor thrombus/invasion extending into the intra-thoracic inferior vena cava (IVC) above the diaphragm as well as huge liver tumors located at the root of hepatic vein, an appropriate approach to the intra-thoracic IVC through the abdominal cavity is the key to control the intraoperative massive bleeding. The pericardium and diaphragm are separated by using fingers without injury of the pericardium. From just below the xiphoid process to the IVC, the diaphragm is vertically dissected without cutting the pericardium and doing median sternotomy. Then the intra-thoracic IVC is exposed easily and encircled with an umbilical tape. This technique was applied in four patients (hepatocellular carcinoma: n = 3, cholangiocellular carcinoma: n = 1). The mean patient's age was 69 (59-81) year old, and three were male. The median duration of surgery and blood loss was 490 min and 3600 mL, respectively. The median peaked aspartate aminotransferase and total bilirubin was 428 IU/mL and 2.75 mg/dL, respectively. The median duration of hospital stay was 22 days. This approach to intra-thoracic IVC through the abdominal cavity is very beneficial and helpful for many liver surgeons.

EphB4 Activates Endothelial Nitric Oxide Synthase in An Akt-dependent Mechanism to Regulate Vein Graft Adaptation

Introduction: EphB4, a receptor tyrosine kinase, is a marker of venous identity in adult veins that also controls wall thickness during vein graft adaptation to the arterial environment. Since the role of endothelial nitric oxide synthase (eNOS) in vein graft adaptation is not well understood, we evaluated whether eNOS is a downstream effector of EphB4 mediated signaling that controls vein graft thickness. Methods: Intrathoracic inferior vena cava was harvested from wild-type (WT) or eNOS knockout (KO) mice and placed as an interposition vein graft into the infrarenal aorta of WT mice.

EphB4 activates endothelial nitric oxide synthase to limit vein graft thickening

METHODS: Intrathoracic inferior vena cava was harvested from wild-type (WT) or eNOS knockout (KO) mice and placed as an interposition vein graft into the infrarenal aorta of WT mice. Vein grafts were harvested and analyzed after 3 weeks. EphB4 was activated in mouse lung endothelial cells (EC) in vitro using the bivalent ligand Ephrin-B2/Fc. In some experiments EphB4 was clustered by pretreatment with anti-Fc. eNOS activation was assessed by eNOS phosphorylation on Western blot analysis.

Total vascular hepatic exclusion for tumor resection: a new approach to the intrathoracic inferior vena cava through the abdominal cavity by cutting the diaphragm vertically without cutting the pericardium

For the resection of advanced liver tumors in which the tumor thrombus extends into the intrathoracic inferior vena cava (IVC) above the diaphragm, surgeons need very skillful techniques and much experience. However, after detachment of the line of fusion of the pericardium to the diaphragm (LFPD), the intrathoracic IVC can be exposed easily. We herein present this novel surgical method, an approach to the intrathoracic IVC through the abdominal cavity. A 66 year-old man was referred to our hospital because of high-grade fever. Computed tomography revealed a large tumor of the left hepatic lobe with tumor thrombus extending into the intrathoracic IVC through the left hepatic vein. Laboratory data showed elevated levels of alpha-fetoprotein (AFP) (726 ng/ml) and protein induced by vitamin K absence (114 AU/ml). The patient was diagnosed with hepatocellular carcinoma (HCC) of the left hepatic lobe with tumor thrombus extending into the IVC. He underwent left hepatectomy with partial resection of the IVC and intravascular tumor thrombectomy under total hepatic vascular exclusion (THVE) without the use of cardiopulmonary bypass (CPB). Before THVE, we approached the IVC through the abdominal cavity with vertical dissection of the diaphragm after detachment of the LFPD without cutting the pericardium or performing median sternotomy. This procedure could be very beneficial and helpful for many liver surgeons.

A rare case of complex vascular reconstruction in liver transplantation

Abnormalities of recipient or donor vascular structures are associated with reconstructive difficulties in liver transplantation. A patient with thrombosis of the right hepatic vein and associated stricture of the inferior vena cava (IVC), portal vein thrombosis and multiple aberrant arteries underwent orthotopic liver transplantation. The donor's suprahepatic IVC was anastomosed to the recipient's intrathoracic IVC. The portal vein flow was restored by venous graft interposition, while the arterial flow was ensured by interposing an iliac arterial graft anastomosed to the infrarenal aorta. In conclusion, graft function remains excellent more than 5 years postoperatively.

Effects of respiration and vasodilation on venous volume in animals and man, as measured with an impedance catheter

Venous return determines cardiac preload and is in turn affected by respiration and vasodilation. The purpose of the present study was to examine the dynamics of venous return and venous volume, using impedance volume measurements in the venous system. In order to develop a methodology for the assessment of venous volume and venous return in man, we first studied 17 endotracheally intubated and ventilated anesthetized closed-chest dogs. We measured central venous and inferior vena cava (IVC) pressure (micromanometer) and volume (impedance catheter). Studies were done above and below the diaphragm with normal ventilation, with positive end-expiratory pressure (PEEP), and with beta-adrenergic blockade and i.v. nitroglycerin. Intrathoracic IVC volume fell and extrathoracic IVC volume rose with lung inflation, while PEEP raised extrathoracic IVC volume and lowered intrathoracic IVC volume. Nitroglycerin lowered intrathoracic IVC volume. Beta blockade did not affect IVC volume, ventilatory variation, or response to PEEP and nitroglycerin. We performed similar studies in 14 human subjects during normal quiet respiration, with measurements above and below the diaphragm, and with interventions including Valsalva maneuver and i.v. nitroglycerin. Intrathoracic IVC volume fell and extrathoracic IVC volume rose with expiration and Valsalva maneuver. Nitroglycerin again lowered intrathoracic IVC volume. We conclude that venous volume and the dynamics of venous return can be assessed in animals and man with an impedance catheter. Specifically, we show the divergent effects of respiration, ventilation, PEEP, and nitroglycerin on IVC volumes above and below the diaphragm. Beta-adrenergic blockage does not appear to play a role in altering any of these effects.(ABSTRACT TRUNCATED AT 250 WORDS)

Computed tomographic demonstration of mediastinal venous anomalies.

Computed tomographic demonstration of mediastinal venous anomaliesWR Webb, G Gamsu, JM Speckman, JA Kaiser, MP Federle and MJ LiptonAudio Available | Share