Biomedical subjects
Publications and source records attributed to J Tisnado.
Pulmonary embolism is an uncommon cause of a massive unilateral lung scan perfusion defect; other causes may mimic PE clinically. Angiography may, therefore, be essential for accurate diagnosis.
Over the past 7 years, eight patients with splanchnic artery aneurysms and pseudoaneurysms were studied and treated. Transcatheter embolization resulted in occlusion of the lesions in all eight patients. Potentially risky and difficult surgery was avoided completely in four patients. Three patients had elective surgery at a later date when their condition was more stable. The remaining patient had definitive surgery after embolization. Transcatheter embolization should be the initial treatment of choice in splanchnic artery aneurysms and pseudoaneurysms.
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We report a patient who sustained a single gunshot wound in the left supraclavicular fossa followed by retrograde venous bullet embolization from the left subclavian or innominate veins to a tributary of the right popliteal vein. We briefly discuss the clinical importance of this occurrence and emphasize the value of venography in the diagnosis of this rare form of missile migration.
Local infection at the puncture site following percutaneous angiography has been reported as exceedingly rare. We describe the first patient with documented septic arthritis of the hip following percutaneous transfemoral arteriography. Radiologists should be aware of this potentially serious complication.
We report a patient with a cervical aortic arch diagnosed by thoracic aortography and restudied 12 years later. We also briefly discuss the clinical significance of this rare anomaly of development of the aortic arch.
A renal transplant recipient developed acute renal transplant vein thrombosis following surgery for a total hip replacement. As an alternative to standard surgical therapy, the patient was treated with selective intravenous low-dose infusion of streptokinase at doses of 5,000-20,000 units/h. The infusion was continued for 120 h with constant monitoring of PT, PTT, and fibrinogen levels. Therapy resulted in excellent preservation of renal function without complications. Low-dose selective infusion of streptokinase should be considered a potential alternative therapy for acute transplant renal vein thrombosis.
This extensive study of thoracic sarcoidosis calls attention to a number of unusual manifestations of the disease including airway compression, venous obstruction and direct pericardial and myocardial involvement.
A technique is described for angioplasty of the renal arteries using two catheters in a patient with two renal arteries to the left kidney. Injury to the nonstenotic supplemental artery during balloon dilatation of the stenotic main artery was avoided with the use of this technique.
Persistence of the sciatic artery (SA) is a rare vascular anomaly, resulting from lack of regression of an embryonal artery to the lower extremity. Forty-nine cases have been published in the world literature since 1832. The persistent sciatic artery (PSA) is particularly prone to undergo aneurysm formation or atherosclerosis. It originates from the internal iliac artery, courses in close proximity to the sciatic nerve, and provides the main supply to the popliteal artery because a hypoplastic superficial femoral artery (SFA), contributing only collaterals to the knees, is usually associated with a PSA. This anomaly should be kept in mind in the clinical assessment of a pulsatile gluteal mass. It also presents a potential hazard during hip and renal transplant surgery.
Small aortic injuries are difficult to detect by computed tomography. We report a patient with a traumatic aortic injury that was not demonstrated on two high-resolution computed tomography scans 1 month apart despite prior angiographic demonstration of the lesion.
We describe a patient with a chronic urinary cutaneous fistula following partial nephrectomy of a previously separated horseshoe kidney, who was treated successfully by stainless steel coil embolization of the renal artery. Thus, a major reoperation was avoided.
We report a severely traumatized patient who developed massive bleeding through surgical drains in the postoperative period. Superselective dorsal pancreatic arteriography demonstrated extravasation of contrast material in the pancreatic bed. Embolization with Gel-foam particles successfully controlled this severe bleeding. Transcatheter embolization is the procedure of choice for controlling pancreatic bleeding in acutely traumatized patients.
Adrenal carcinomas are rare. We present four surgically and pathologically proved large right adrenal carcinomas studied by computed tomography, angiography, and other imaging modalities. Computed tomography demonstrated large nonhomogeneous right upper quadrant masses in all four cases, but the adrenal origin of the mass could not be ascertained by computed tomography in three patients due to the transverse display of the anatomy. Ultrasonography provided important additional information in these cases. Arteriography was diagnostic in each case by demonstrating minimal to marked tumor vascularity supplied by adrenal arteries. We also present, for differential diagnostic purposes, a proved benign adrenal hemorrhagic cyst with computed tomography and angiography findings indistinguishable from those of adrenal carcinomas. Computed tomography does not eliminate the need for angiography in patients with large right upper quadrant masses suspected of being an adrenal carcinoma.
Intra-arterial, low-dose streptokinase therapy was administered to five patients with acute hand ischemia (2 to 48 hours' duration) and one patient with chronic hand ischemia (3 months' duration). In the five patients with acute ischemia excellent restoration of patency of occluded hand arteries was obtained, with complete recovery of hand function and avoidance of tissue loss despite the severity of these cases. In the remaining patient with an iatrogenic chronic occlusion, ischemia could not be relieved and bypass surgery was performed with satisfactory results noted at the 3-month follow-up examination. No complications were encountered during or after any of these procedures. The catastrophic consequences of hand ischemia, i.e., loss of limbs or digits, were avoided.
Recurrent occlusive disease was found by noninvasive methods and confirmed arteriographically in 7 patients who had undergone endarterectomy for stenosis of one [5] or both iliac arteries [1] or the subclavian artery [1]. Three patients with iliac artery stenosis had percutaneous transluminal angioplasty (PTA) 1 to 5 years after endarterectomy. One patient with stenosis of the external iliac artery had PTA 4 years after endarterectomy, and dilatation was repeated 7 months later because of recurrence. One patient had 2 endarterectomies and 2 PTAs within 8 years for stenosis of the right common iliac artery. One patient had recanalization of the left common iliac artery 6 years after endarterectomy with low-dose streptokinase followed by PTA. Another patient underwent endarterectomy of the left subclavian artery 3 months after PTA and required further dilatation at 5 and 10 months because of recurrence. The authors conclude that endarterectomy does not preclude PTA (or vice versa) in patients with recurrent arterial occlusive disease.
We describe a simple technique to straighten the curved tip of a "J" guidewire when the plastic introducer is not readily available. This technique may expedite angiographic procedures.