Arrhythmogenic RV dysplasia.
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Arrhythmias, Cardiac↗
Biomedical subjects
O Topaz
Publications and source records attributed to O Topaz.
Aneurysm of the fossa ovalis in infants: a pathologic study.
An aneurysm of the fossa ovalis was identified at autopsy in 17 infants. In each case the aneurysm of the fossa ovalis was considered to have resulted from excessive elevation of pressure in that atrium contralateral to the side into which the aneurysm bulged. The aneurysms were divided into two types: intrinsic (three cases) and extrinsic (14 cases). The intrinsic types of aneurysms of the fossa ovalis were considered to have started in fetal life and were consequences of abnormally narrow states of interatrial ostium II. Each intrinsic aneurysm bulged toward the left. Among the extrinsic types of aneurysm of the fossa ovalis, each was considered to have resulted from the hemodynamic consequences of a congenital anomaly in one side of the heart or other. Six aneurysms of extrinsic type bulged toward the left and eight toward the right. Aneurysm of the fossa ovalis should be included in the differential diagnosis of space-occupying conditions within the atria.
Female↗
Pathologic features of sudden death in children, adolescents, and young adults.
Pathologic investigation of 50 children, adolescents, and young adults who died suddenly and unexpectedly revealed that the most frequently encountered cardiovascular diseases were mitral valve prolapse (12 cases), myocarditis (12 cases), hypertrophic cardiomyopathy (six cases), and anomalous origin of a coronary artery from the aorta (two cases). Five subjects had no evidence of cardiac abnormalities. A striking family history of sudden death was encountered among eight subjects, of whom three had mitral valve prolapse and three had normal hearts. Assessing the circumstances surrounding sudden death, it was found that at the time of collapse, 32 subjects were engaged in regular activity, eight subjects were engaged in active athletics, and ten were found dead in bed. A relationship of the terminal event to emotional stress was reported in three subjects.
Adolescent↗
In vivo effect of coronary laser angioplasty on atherosclerotic plaques: histopathologic analysis.
Information from histopathologic examination of coronary arterial atherosclerotic plaques treated with in vivo laser energy is sparse. Directional atherectomy provides biopsies for study of tissue changes (injury) due to coronary arterial debulking devices, including laser. Sixteen patients who presented with acute ischemic coronary syndromes underwent debulking of a total of 17 obstructive intracoronary lesions with pulsed-wave holmium:YAG laser (2.1 microm wavelength). Laser was performed with the "pulse and retreat" technique which incorporates slow catheter advancement (0.5-1 mm/s) with controlled emission of energy. Immediately postlasing, directional atherectomy was utilized to obtain irradiated plaque tissue for pathologic examination. Extent of laser-induced tissue injury to plaques was graded as 0 (no tissue damage), 1 (small foci or charring and vacuoles), 2 (large amount of charring, edge disruption and vacuoles) and 3 (extensive tissue damage). Angiographically and clinically, all 17 lesions were successfully debulked with the laser energy (mean 47+/-25 pulses), with a reduction of target lesion percent diameter stenosis from 92+/-6% to 47+/-25%. Adjunct balloon dilations further reduced the target lesions to a final of 10+/-10% stenosis. The histopathologic examination of the lased specimens demonstrated that 13 lesions (76%) had no evidence of laser-induced injury (Grade 0). Four lesions had low-level injury (Grade 1), and none had evidence of Grade 2 or 3 laser-induced trauma. Therefore, a laser debulking technique, which incorporates slow catheter advancement with controlled emission of pulses, does not cause significant injurious effects to the irradiated plaque.
Aged↗
Plaque removal and thrombus dissolution with the photoacoustic energy of pulsed-wave lasers-biotissue interactions and their clinical manifestations.
Pulsed-wave lasers ablate atherosclerotic plaque and dissolve coronary thrombus by emission of photoacoustic energy initiating photomechanical, photochemical and photothermal transformation. The newly discovered process of 'inertially confined ablation' ascribes to pressure generation and plaque vaporization during lasing. Tremendous pressure within the lased plaque and gas bubble formation account for adverse clinical manifestations such as perforations, acute vessel closure and dissections. Pulsed-wave lasers can be applied for selected patients with lesions considered 'nonideal' for balloon angioplasty who present with acute ischemic syndromes. Due to strong optical absorption by thrombi in the ultraviolet (excimer), visible (dye), and mid-infrared (holmium) wavelengths, these lasers can also dissolve clots and therefore serve as an emerging option in patients with complicated acute myocardial infarction who fail to respond to thrombolytic drugs and exhibit thrombotic lesions deemed unsuitable for standard balloon angioplasty.
Acoustics↗