28 y.o. female with a history of HbSS sickle cell disease (vaso-occlusive crises), Moya Moya with prior stroke (2014), and chronic SVC occlusion presented on 8/27/25 for planned exchange transfusion and management related to central venous access/central venous outflow. She was taken to Interventional Radiology on 8/29 for central line placement and SVC recanalization. Prior to the procedure, documentation reflects she was clinically stable and alert/oriented with baseline mentation intact, and the case was performed under general anesthesia.
During the procedure ***see attached procedure note***, the operator performed SVC recanalization of a short-segment occlusion using advanced crossing techniques, followed by balloon venoplasty. After balloon dilation, an SVC tear occurred with contrast extravasation noted on venography. The balloon was reinflated for temporary control, and a covered stent was deployed across the treated/injured segment. Post-deployment imaging documented no obvious ongoing active extravasation.
Despite this, the patient became profoundly hypotensive, and bedside ultrasound identified a large pericardial effusion concerning for tamponade physiology. She progressed to pulseless electrical activity (PEA) arrest and underwent resuscitation. Emergent pericardiocentesis was performed with placement of a pericardial drain and evacuation of ~300 mL of blood, after which return of spontaneous circulation (ROSC) was achieved. She required vasopressor support; surgical and ECMO-capable teams were consulted during the event; and she was transferred to a higher-acuity ICU setting in critical condition.
Post-event, her inpatient course was dominated by critical care needs and neurologic assessment after the reported downtime. When sedation was reduced the following day, she was not following commands with concerning neurologic findings, and subsequent neuroimaging was described as consistent with anoxic/hypoxic brain injury (MRI later noting scattered diffusion restriction). The remainder of the hospitalization reflected significant functional decline from baseline with prolonged ventilatory/ICU-level support and progression toward long-term supportive planning.
Questions for review
Was the decision-making and technical approach to SVC recanalization/venoplasty—including crossing method, balloon sizing/pressure, and covered stent selection/deployment—within the standard of care, or were there avoidable technical errors that likely caused the SVC tear?
Once hypotension began, was recognition of tamponade and the sequence/timing of actions (bedside US/echo, escalation, CPR, pericardiocentesis/drain placement) timely and appropriate, or was there delay/mismanagement that likely worsened low-flow time and neurologic outcome?
Assuming the tear and tamponade occurred, is it more likely than not that tamponade-related PEA arrest/low-flow time was the primary driver of the anoxic brain injury and long-term decline, and if there was any deviation, would alternative management more likely than not have prevented the arrest or reduced neurologic injury?
Thank you in advance. Questions are welcome.
MAT# 18367170
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Q: I am happy to assist with medical record review and imaging review of this case if needed.
A: —
Q: any updates with this case?
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Do you believe there might have been medical error?
Based on review of the interventional radiology operative report, the complication described (SVC tear with pericardial tamponade and PEA arrest) is a known and recognized risk of chronic SVC recanalization, particularly in patients with prior central venous instrumentation and fibrotic occlusions. The documentation shows appropriate patient selection, informed consent, and a technically reasonable approach. The complication was promptly recognized and appropriately managed with covered stent deployment and emergent ultrasound-guided pericardiocentesis, resulting in return of spontaneous circulation. There is no clear evidence of a deviation from the standard of care based on the records reviewed.
Do you believe there might have been causation (i.e. the medical error resulted in an injury)?
Based on the records reviewed, there is no clear underlying medical error identified in the performance of the procedure. The adverse event (pericardial tamponade with PEA arrest) represents a recognized procedural complication, not a deviation from the standard of care. The complication was promptly identified and appropriately treated, resulting in return of spontaneous circulation and stabilization. Because there is no demonstrable medical error, there is no clear causal link between negligence and injury, making causation extremely unlikely based on the available documentation.
What makes you a good expert for this case?
I am a board-certified diagnostic and interventional radiologist with extensive experience in complex central venous access, chronic venous occlusion recanalization, and management of intraprocedural complications. I routinely perform high-risk venous interventions and have direct clinical experience recognizing and managing complications such as vascular injury and hemodynamic collapse. In addition, I regularly serve as a medical expert reviewer, providing standard-of-care and causation opinions grounded in current practice standards and real-world procedural experience, allowing me to offer an objective and well-supported assessment in this case.
How often do you encounter cases similar to this one in your practice?
I encounter cases involving complex central venous access issues and management of procedural complications on a regular basis in my interventional radiology practice. While catastrophic complications such as SVC rupture with tamponade are uncommon, they are well-recognized risks in chronic central venous occlusion recanalization and are situations I am familiar with both clinically and through case review.
Do you believe there might have been medical error?
Based on the materials described, superior vena cava recanalization and venoplasty in a young patient with chronic central venous occlusion and multiple comorbid conditions is generally considered a recognized but inherently higher risk interventional radiology procedure, and the use of advanced crossing techniques, balloon venoplasty, and covered stent placement to address an intraprocedural vessel injury fall within commonly described endovascular treatment options; superior vena cava rupture is an acknowledged but infrequent complication even when customary sizing and pressure considerations are used, particularly in long standing occlusions with fibrotic change, and the occurrence of a tear alone does not by itself establish or exclude technical error without more granular procedural detail regarding device selection, measurements, and technique. With respect to the intraprocedural hemodynamic deterioration, the reported sequence of identifying hypotension, performing bedside ultrasound that demonstrated pericardial effusion, initiating resuscitative measures, performing pericardiocentesis with drain placement, consulting surgical and extracorporeal support teams, and transferring the patient to a higher acuity care setting is generally consistent with recognized management pathways for suspected cardiac tamponade in an angiography environment, although precise assessment of timeliness and adequacy depends on exact time intervals and contemporaneous documentation. From a causation perspective, acute cardiac tamponade with subsequent pulseless electrical activity and a period of reduced or absent cerebral perfusion represents a medically plausible and commonly cited mechanism for later hypoxic or anoxic brain injury and neurologic decline; however, neurologic outcome in such scenarios is multifactorial and may be influenced by total low flow duration, baseline cerebrovascular status, underlying hematologic and vascular conditions, and other peri arrest variables, such that determining the relative contribution of specific technical or response factors, or whether alternative approaches would have meaningfully altered outcome, typically requires comprehensive review of complete records, imaging, and precise event chronology.
Do you believe there might have been causation (i.e. the medical error resulted in an injury)?
Based on the materials described, superior vena cava recanalization and venoplasty in a young patient with chronic central venous occlusion and multiple comorbid conditions is generally considered a recognized but inherently higher risk interventional radiology procedure, and the use of advanced crossing techniques, balloon venoplasty, and covered stent placement to address an intraprocedural vessel injury fall within commonly described endovascular treatment options; superior vena cava rupture is an acknowledged but infrequent complication even when customary sizing and pressure considerations are used, particularly in long standing occlusions with fibrotic change, and the occurrence of a tear alone does not by itself establish or exclude technical error without more granular procedural detail regarding device selection, measurements, and technique. With respect to the intraprocedural hemodynamic deterioration, the reported sequence of identifying hypotension, performing bedside ultrasound that demonstrated pericardial effusion, initiating resuscitative measures, performing pericardiocentesis with drain placement, consulting surgical and extracorporeal support teams, and transferring the patient to a higher acuity care setting is generally consistent with recognized management pathways for suspected cardiac tamponade in an angiography environment, although precise assessment of timeliness and adequacy depends on exact time intervals and contemporaneous documentation. From a causation perspective, acute cardiac tamponade with subsequent pulseless electrical activity and a period of reduced or absent cerebral perfusion represents a medically plausible and commonly cited mechanism for later hypoxic or anoxic brain injury and neurologic decline; however, neurologic outcome in such scenarios is multifactorial and may be influenced by total low flow duration, baseline cerebrovascular status, underlying hematologic and vascular conditions, and other peri arrest variables, such that determining the relative contribution of specific technical or response factors, or whether alternative approaches would have meaningfully altered outcome, typically requires comprehensive review of complete records, imaging, and precise event chronology.
What makes you a good expert for this case?
My clinic and research expertise is superior vena cava recanalization and stent reconstruction. I am happy to assist with this case if needed.
How often do you encounter cases similar to this one in your practice?
I have performed >200 superior vena cava stent reconstructions and have had such cases in my practice. I am happy to assist with this case if needed.
Do you believe there might have been medical error?
This is an unfortunate, however known complication of this type of procedure. The patient's SVC occlusion and need for ongoing central venous access left her with little choice but to undergo the procedure. This high-risk procedure has pitfalls for which the operator was prepared. This included: doing the procedure under general anesthesia, having appropriate supplies on hand (ie. covered stent), and recognizing and reacting appropriately to the complication with temporary balloon tamponade, covered stent placement, CPR, pericardial drainage, and activation of additional support (ie. CT Surgery, ECMO team, etc). An unexperienced or negligent operator would not have been as prepared. One would have to examine the procedural images to further assess if an error was committed. However, the procedure report demonstrates that the operator knew what he was doing. The procedure report does not indicate the timing of events and whether the operator's reactions were timely. One would have to examine the procedure log in greater detail.
Do you believe there might have been causation (i.e. the medical error resulted in an injury)?
It is clear that the complication and resulting cardiac arrest and cerebral hypoperfusion caused the patient's neurologic outcome, however, we must examine the procedure log to ascertain whether or not there was unnecessary delay in the steps taken to mitigate the complication.
What makes you a good expert for this case?
I am a seasoned operator with strong expert witness experience.
How often do you encounter cases similar to this one in your practice?
I do many procedures similar to this. I have not personally performed this exact procedure as it is rare and relatively uncommon in any practice. I have, however, published a case series pertaining to this exact type of procedure, published in JVIR in 2018.
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