No abstract available.
Brugada Syndrome* ; Bundle-Branch Block* ; Death, Sudden, Cardiac*

OBJECTIVES: To investigate the role of ATP-sensitive potassium channel (KATP) during sustained ventricular fibrillation (VF), the effects of gliburide, a specific blocker of KATP channel and PCO400, an KATP opener, were studied in isolated and perfused swine right ventricular free walls (n=). METHODS: Recording of single cell transmembrane potentials was performed and constructed action potential duration restitution (APDR) curve by plotting APD 90%(APD90) versus preceding diastolic interval (DI). RESULTS: All isolated tissues fibrillated spontaneously. In this preparation, stable VF could persist over a 4-hour period if it was allowed to continue undisturbed (n=). Gliburide (1-5 uM) increased DI without significant changes in APD90 during VF, resulting in more regularization of VF. Higher concentration (10-20 uM) increased both APD90 and DI, and converted to monomorphic ventricular tachycardia (MVT) through the transitional period characterized by APD alternans. PCO400 (1-2.5 uM) caused a significant shortening of APD during MVT and a period of APD alternans became more evident before conversion from MVT to VF. Gliburide eliminated profibrillatory effect of PCO400. This antifibrillatory action of gliburide was accompanied by gradual decrease in the maximum slope of APDR curve during VF. CONCLUSION: KATP channel blockade causes a transition from VF to MVT via lengthening of DI and APD alternans, concomitantly with a reduction of the slope of APD restitution curve.
Action Potentials ; Membrane Potentials ; Potassium Channels ; Swine ; Tachycardia, Ventricular ; Ventricular Fibrillation*

Chondroid syringoma is a sweat gland tumor that is composed of a mixture of epithelial cells and mesenchymal tissue. It is most frequently located on the head and neck. Chondroid syringoma is a firm intradermal or subcutaneous nodule. Histologically, the epithelial component consists of tubulocystic structures and aggregates of epithelial cells as well as single scattered epithelial cells throughout the stroma. It rarely contains osteoid stroma, and there are only a few reports of cases associated with ossification. We describe here an unusual chondroid syringoma associated with marked ossification.
Adenoma, Pleomorphic* ; Epithelial Cells ; Head ; Neck ; Sweat Glands

BACKGROUND: Arterial stiffening may affect regional myocardial function in hypertensive patients with normal ejection fraction (EF). METHODS: Brachial-ankle pulse wave velocity (PWV) was measured in 70 patients, of mean age 48 +/- 14 years, with untreated hypertension and EF > 55%. Using two-dimensional-speckle tracking echocardiography, we measured longitudinal and circumferential strain (epsilon) and strain rate (SR). Basal and apical rotations were measured using short axis views. RESULTS: The mean systolic and diastolic blood pressure in these patients was 152 +/- 15 mmHg and 92 +/- 11 mmHg, respectively. The mean value of PWV was 1578 +/- 274 cm/s. PWV significantly correlated with age (r = 0.682, p < 0.001), body mass index (r = -0.330, p = 0.005), systolic blood pressure (r = 0.386, p = 0.001) and pulse pressure (r = 0.509, p < 0.001). PWV also significantly correlated with septal E' velocity (r = -0.570, p < 0.001), E/A ratio (r = -0.414, p < 0.001), E/E' ratio (r = 0.589, p < 0.001), systolic global longitudinal epsilon (r = 0.300, p = 0.012) and early diastolic SR (SRE) (r = -0.479, p < 0.001) suggesting impaired abnormal relaxation. PWV was also correlated with basal rotation (r = -0.301, p = 0.011) and basal-to-apical twist (r = -0.256, p = 0.032). The increases in apical rotation and basal-to-apical twist were attenuated in patients with PWV > 1700 cm/s compared to those with PWV < or = 1400 cm/s or those with PWV 1400-1700 cm/s. CONCLUSION: In hypertensive patients with normal ejection fraction, arterial stiffening contributes to impaired systolic and diastolic function of the regional myocardium. Compensatory increases in ventricular twist were diminished in patients with advanced stage of vascular stiffening.
Axis, Cervical Vertebra ; Blood Pressure ; Body Mass Index ; Echocardiography ; Humans ; Hypertension ; Myocardium ; Pulse Wave Analysis ; Relaxation ; Sprains and Strains ; Track and Field ; Vascular Stiffness

A 34-year-old man, who had been treated with an endoscopic injection of a mixture of n-butyl-2-cyanoacrylate (Histoacryl) and Lipiodol for control of variceal bleeding 6 months previously, presented with an intracardiac mass in the right atrium (RA). Two-dimensional echocardiography revealed an intracardiac mass in the RA that appeared to extend from the inferior vena cava. The origin of the sclerosant was traced by computed tomography (CT). This is a very rare case in which the sclerosant migration route was demonstrated by CT scan. The findings of this case suggest that the systemic migration of sclerosant into an intracardiac chamber should be considered in patients with an intracardiac mass, especially with a history of previous sclerotherapy for variceal bleeding.
Adult ; Echocardiography ; Embolism ; Enbucrilate ; Esophageal and Gastric Varices ; Esophagus ; Ethiodized Oil ; Heart Atria ; Hemorrhage ; Humans ; Sclerotherapy ; Vena Cava, Inferior

Neurogenic pulmonary edema (NPE) leading to cardiopulmonary dysfunction is a potentially life-threatening complication in patients with central nervous system lesions. This case report describes a 28-yr woman with life-threatening fulminant NPE, which was refractory to conventional respiratory treatment, following the rupture of an aneurysm. She was treated successfully with extracorporeal membrane oxygenation (ECMO), although ECMO therapy is generally contraindicated in neurological injuries such as brain trauma and diseases that are likely to require surgical intervention. The success of this treatment suggests that ECMO therapy should not be withheld from patients with life-threatening fulminant NPE after subarachnoid hemorrhage.
Adult ; Brain/radiography ; Decompressive Craniectomy ; Extracorporeal Membrane Oxygenation ; Female ; Humans ; Intracranial Aneurysm/complications/*diagnosis ; Pulmonary Edema/*diagnosis/etiology/therapy ; Subarachnoid Hemorrhage/etiology ; Tomography, X-Ray Computed

BACKGROUND: In acute myocardial infarction, left ventricular remodeling, which was influenced by infarct size, location, and patency of infarct related artery(IRA), is a important prognostic factor for chronic heart failure and survival. Recently, several reports suggested that patent IRA does not always mean true myocardial reperfusion, and myocardial contrast echocardiography(MCE) may be a useful tool for assessing infarct size and viability of infarcted myocardium. So, we investigated the association between the degree of myocardial reperfusion assessed by MCE and long term change of left ventricular volume in acute anterior wall myocardial infarction patients who had patent IRA. METHODS: The study population was consisted of 17 patients with first acute anterior wall myocardial infarction patients who had patent left anterior descending artery by thrombolytic therapy or rescue PTCA. MCE was done immediately after coronary angiography within two weeks of myocardial infarction onset and analyzed by semiquantitative method to get opacification index. For analysis of left ventricular ejection fraction, wall motion abnormality and left ventricular volume, echocardiogram was taken within 2 weeks of myocardial infarction oneset and 9 months later in each case. Wall motion abnormality was quantified as wall motion index. According to serial changes of left ventricular volume, patients were divided into two groups ; group 1(less than 10% increase of LV volume at follow-up compared to intial echocardiographic exam) and group 2(more than 10% increase of left ventricular volume). We compared the opacification index of infarcted myocardium, wall motion abnormality, and ejection fraction between the two groups. RESULTS: Initial left ventricular volume and ejection fraction were not different between group 1 and group 2, but the opacification index was lower and initial wall motion index higher in group 2 than group 1. Opacification index, wall motion index, ejection fraction and left ventricular volume were closely correlated in the whole cases. By multivariate ananlysis, opacification index was the only significant factor predicting left ventricular volume increment. CONCLUSION: Myocardial reperfusion, which is closely correlated with ejection fraction and wall motion abnormality, acts as a independent predictor of left ventricular dilatation after acute anterior wall myocardial infarction. This result suggests that assessment of microvascular integrity with myocardial contrast echocardiography may be a valuable indicator to predict long-term change of left ventricular volume, although this is suggestive result in a limited number of patients.
Anterior Wall Myocardial Infarction* ; Arteries ; Coronary Angiography ; Dilatation ; Echocardiography ; Follow-Up Studies ; Heart Failure ; Humans ; Myocardial Infarction ; Myocardial Reperfusion* ; Myocardium ; Stroke Volume ; Thrombolytic Therapy ; Ventricular Remodeling

BACKGROUND AND OBJECTIVES: It has been shown that the coronary flow reserve (CFR) of an infarct related artery can predict left ventricular functional recovery following acute myocardial infarction (AMI). However, the prognostic value of CFR on the long-term clinical outcome of patients with an AMI has not been studied. SUBJECTS AND METHODS: Using a Doppler guide wire, we measured the CFR in 130 patients with an AMI following successful intervention (6+/-3 days after onset of the AMI). Two-year follow-up was conducted with regard to end points, including : cardiac death, non-fatal AMI, and severe congestive heart failure (CHF; > or = NYHA III). RESULTS: During the follow-ups, cardiac events occurred in 17 patients (5 deaths, 3 non-fatal AMIs and 9 severe CHFs). After analysis of the receiver operating characteristic curves, the best cut-off value for CFR in predicting cardiac events was 1.4 (sensitivity 76.5%, specificity 73.5%, accuracy 82.0%). With cardiac events as an end point, a 2-year Kaplan-Meier event survival analysis revealed that the patients with a CFR < or = 1.4 had a worse prognosis than those with a CFR >1.4 (Event free survival rates were 69.8% vs. 95.4%, respectively, p<0.001). Using Cox proportional hazard analyses, as an independent predictor, age, heart rate, CFR and left ventricular end systolic volume index, were also found to be significantly associated with cardiac events (hazard ratios 1.1224, 1.0404, 0.1887, and 1.0588, respectively). CONCLUSION: The coronary flow reserve, of infarct related arteries, measured during the early recovery phase can be used as an independent predictor for the prognosis of patients with an acute myocardial infarction following successful intervention.
Arteries ; Coronary Circulation ; Death ; Follow-Up Studies ; Heart Failure ; Heart Rate ; Humans ; Myocardial Infarction* ; Prognosis ; ROC Curve ; Sensitivity and Specificity ; Stroke Volume ; Survival Rate

Proinflammatory cytokines and their receptors are increased in the peripheral blood of patients with heart failure. We measured cytokines and their receptors in systemic artery (SA), coronary sinus (CS) and infra-renal inferior vena cava (IVC), in order to investigate their origin and influential factors. Thirty patients with idiopathic dilated cardiomyopathy were performed echocardiography at admission, and right heart catheterization after stabilization. Blood was drawn from 3 sites for measurement of tumor necrosis factor-alpha (TNF-alpha), interleukin-6 (IL-6) and soluble tumor necrosis factor- receptor (sTNFR) I, II. TNF-alpha at CS (3.25+/-0.34 pg/mL) was higher than those of SA (1.81+/-0.39 pg/mL) and IVC (1.88+/-0.38 pg/mL, p<0.05). IL-6 at CS (18.3+/-3.8 pg/mL) was higher than that of SA (5.8+/-1.2 pg/mL, p<0.01). The levels of sTNFR I, II showed increasing tendency in sequence of SA, IVC and CS. TNF-alpha and sTNFR I, II from all sites were proportional to worsening of functional classes at admission (p<0.05). E/Ea by Doppler study at admission, which reflects left ventricular end-diastolic pressure (LVEDP) was positively correlated with TNF-alpha from SA (R=0.71, p<0.01), CS (R=0.52, p<0.05) and IVC (R=0.46, p<0.05). Thus, elevated LVEDP during decompensation might cause cytokine release from myocardium in patients with idiopathic dilated cardiomyopathy.
Adult ; Aged ; Cardiomyopathy, Congestive/*blood/*immunology ; Female ; Heart/anatomy & histology ; Hemodynamic Processes ; Human ; Interleukin-6/*blood ; Male ; Middle Aged ; Receptors, Tumor Necrosis Factor/*blood ; Statistics ; Tumor Necrosis Factor/*metabolism

BACKGROUND: Atrial fibrillation (AF) has a tendency to become persistent over time and is known to induce atrial electrical, mechanical and ionic remodeling. However, the underlying mechanisms by which AF persists were not fully determined. The present study was carried out to assess alterations in the gene expression, including the oxidative stress-related genes of atrial myocardial cells in patients with persistent AF, and ultrastructural remodeling, as assessed by electron microscopy (EM) in pacing-induced sustained AF canine models. METHODS: cDNA microarray technique and Western blot studies were performed, with tissue samples (right atrial appendage) from 10 patients, 4 with persistent AF and 6 used as controls, which had undergone coronary artery bypass surgery. Four dogs were subjected to continuous left atrial pacing at 400 bpm for at least 12 weeks to induce AF. One dog in sinus rhythm was used as a control sham operation. Tissue samples (1 mm3) were obtained from 4 sites of both atria for EM examination. RESULTS: Thirty up-regulated and 25 down-regulated gene expressions were observed in the patients with AF. Eight of the up-regulated and 6 of the down-regulated genes were oxidative stress-related, which were confirmed by Western blot analyses. The characteristics of ultrastructural remodeling by persistent AF were: 1) an increased number of minimitochondria, 2) disarrayed myofilaments, 3) rarefaction of myofilaments, 4) disintegrated cristae and alignment in mitochondria and 5) vacuolization. CONCLUSIONS: Persistent AF leads to alterations in the gene expression related to oxidative stress in the atrium, and also results in ultrastructural changes similar to those of an ischemia-reperfusion injury.
Animals ; Atrial Fibrillation* ; Blotting, Western ; Coronary Artery Bypass ; Dogs ; Gene Expression* ; Humans ; Microscopy, Electron ; Mitochondria ; Muscle Cells ; Myofibrils ; Oligonucleotide Array Sequence Analysis ; Oxidative Stress ; Reperfusion Injury