Caval Vein Clamping
Caval Vein Clamping - Related Videos
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We present a laparoscopic technique for anatomic S7+S8d resection with right hepatic vein transection, preserving the inferior right hepatic vein and segment S6. Relying on meticulous anatomical landmarks without intraoperative ultrasound, this approach offers a precise and parenchyma-sparing option for dorsally located right-liver tumors, particularly in settings with limited advanced navigation resources.
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Cited by 5 •
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Auxiliary liver transplantation provides a temporary support in acute hepatic failure, until regeneration of the failing liver. The heterotopic auxiliary liver transplantation (HALT) with portal vein arterialization (PVA) renders sufficient liver function. We developed an analogous technique in the rat, to examine the influence of the portal vein arterialization on the morphology and function of the graft.
11:12
Hyperinsulinemic-Euglycemic Clamp in the Conscious Rat
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Cited by 34 •
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The hyperinsulinemic-euglycemic clamp is the "gold standard" for the assessment of insulin action. Insulin is infused at a constant rate stimulating glucose uptake. The amount of exogenous glucose infused to counter this drop is indicative of insulin sensitivity. Here the procedure is performed on a conscious, unrestrained rat.
15:21
Training a Sophisticated Microsurgical Technique: Interposition of External Jugular Vein Graft in the Common Carotid Artery in Rats
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Cited by 9 •
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09:43
Patch Clamp Electrophysiology
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Neuron cell membranes are populated with ion channels that control the movement of charge into and out of the cell, thereby regulating neuron firing. One extremely useful technique for investigating the biophysical properties of these channels is called patch clamp recording. In this method, neuroscientists place a polished glass micropipette against a cell and apply suction to form a high resistance seal. This process isolates a small “patch” of membrane that contains one or more ion channels.
FAQs
Occluding the vena cava reduces venous return to the heart, which lowers cardiac preload, the volume filling the heart before contraction. This change can produce hypotension during the operation, so the clamp must be applied strategically and released or adjusted as needed. Continuous attention to hemodynamic status helps maintain adequate circulation while the surgical field remains controlled.
Collateral pathways provide alternative routes for venous blood flow when the vena cava is temporarily blocked. Their adequacy can influence how well circulation is maintained during clamping and whether additional support is necessary. If collateral flow is insufficient, a temporary bypass may help preserve circulation while surgeons perform vascular repair, tumor resection, transplantation, or other major procedures.
The selected vessel depends on where blood-flow control is required during the operation. Clamping the inferior vena cava addresses flow through the lower major venous pathway, whereas clamping the superior vena cava addresses the upper pathway. This choice allows surgeons to isolate the relevant operative region while considering the effects on venous return and overall hemodynamic stability.
Hemodynamic monitoring guides the timing and extent of caval occlusion. Because clamping can reduce cardiac preload and cause hypotension, surgeons assess circulation while controlling the large-vessel flow needed for the procedure. Strategic clamp placement, attention to collateral circulation, and temporary bypass when needed help balance operative exposure with preservation of adequate systemic circulation.
Caval vein clamping is relevant when surgeons need precise control of large-vessel blood flow during major abdominal or vascular procedures. It may also support liver transplantation and tumor resection, particularly when managing venous structures is essential to the operative field. The technique is selected when temporary flow control can improve hemorrhage management or enable vascular repair.
The principal benefit is a more controlled operative field with reduced blood flow through the clamped vessel, which can support hemorrhage control and precise vascular work. The main physiologic concern is impaired venous return, potentially causing hypotension. Successful use therefore depends on balancing blood-flow control against circulation, using collateral pathways or temporary bypass when required.