BACKGROUND AND OBJECTIVES: In acute myocardial ischemia, the conduction velocity of action potential is decreased by several electrophysiological and physical factors. The ventricular activation time(VAT) is a time duration of electrical impulse propagating from endocardium to epicardium. The goal of this study is to determine whether the reduction in conduction velocity in acute myocardial ischemia can lead a change in VAT. MATERIALS AND METHOD: Thirty patient, 18 males and 12 females, who had received percutaneous balloon coronary angioplasty(PTCA) were enrolled. The mean age was 59 years old. A twelve lead surface electrocardiogram(ECG) were obtained before, during, 1 minute, 5 minutes, and 10 minutes after the PTCA as digitized data by using Cardiolab EP 4.1 program. The magnitude of the QRS wave was amplified 3 to 4 folds and the speed was increased to 200mm/sec in order to get the VAT easily and accurately. The data was the mean of three consecutive VATs. The number of vessel treated with PTCA included left anterior descending artery(12), left circumflex artery(9), and right coronary artery(9). Among twelve chronic stable angina, sixteen unstable angina, and two acute myocardial infarction patients, twenty six had single and four had two vessel diseases. RESULTS: The significant increase in VAT during PTCA compared to that before PTCA was observed in eight of 12 leads. In addition, the significant decrease in VAT of 1, 5, and 10 minutes after PTCA compared to that during PTCA were noted. Furthermore, 10 minutes after PTCA, VAT decreased significantly compared to that before PTCA. The leads did not show a significant change of VAT depending on target vessels. The ECG of 16 patients showed changes of the ST segment during PTCA. The changes of VAT were not related to the ST segment change. CONCLUSION: The conduction delay from endocardium to epicardium in acute myocardial ischemia was presented as a prolongation of VAT in surface ECG. In addition, the conduction delay was recovered within 5 minutes after relief of ischemia. Therefore, the changes of VAT can possibly be used as one of the noninvasive parameters of myocardial ischemia.
Action Potentials ; Angina, Stable ; Angina, Unstable ; Electrocardiography ; Endocardium ; Female ; Humans ; Ischemia ; Male ; Middle Aged ; Myocardial Infarction ; Myocardial Ischemia* ; Pericardium ; Thoracic Surgery, Video-Assisted

BACKGROUND: Exercise testing is an importnat diagnostic and prognostic procedure in the assessment of patients with ischemic heart disease. But standard ST-segment depression criteria was not high enough to estimate coronary srtery disease. Recently, the heart rate adjustment of ST segment depression, ST segment/heart rate slope and index, have been proposed as a more accurate criteria for diagnosing significant coronary artery disease. The objective of this study was to compare the discriminating power of proposed ST segment/heart rate slope and index with that of a standard method of assessing exercise-induced ST segment depression for estimating coronary artery disease. METHODS: Sixty nine patients with ischemic heart disease were studied with exercise treadmill testing and coronary angiography. Computer-measured ST-segment amplitudes were obtained and analysis of the heart rate-adjusted ST segment depression(ST/HR slope and big up tri, Delta ST/HR index) was done. The sensitivity, specificity, and extent of coronary artery disease on each criteria were compared. RESULTS: 1) The sensitivity of big up tri, Delta ST/HR index partition of 1.6uV/beats/min was slightly higher(83%) and the specificity of ST/HR slope partition of 2.4uV/beats/min was higher(87%) than the standard exercise electrocardiographic criteria. 2) Early onset of ischemic ST-segment depression, profound ST-segment depression(> or =2mm), and downsloping ST-segment were associated with more extensive coronary artery disease. 3) On ST/HR slope, no CAD was 1.7+/-0.26uV/beats/min, one vessel disease was 2.6+/-0.34 uV/beats/min, two vessel disease was 2.7+/-1.36uV/beats/min, one vessel disease was 2.8+/-0.35uV/beats/min, and on big up tri, Delta ST/HR index, no CAD was 1.8+/-0.38uV/beats/min, one vessel disease was 2.8+/-1.36uV/beats/min, two vessel disease 3.4+/-1.44uV/beats/min, and three vessel disease was 3.7+/-2.95uV/beats/min. The increment of ST/HR slope and big up tri, Delta ST/HR index were associated with the coronary artery disease and its severity, but the correlations were not high enough. CONCLUSION: The heart rate adjustment of ST segment depression was not high enough for improved detection of coronary artery disease, compared with standard ST-segment depression criteria. But these indexes can be improved the clinical usefulness of the treadmill exercise test for coronary aretry disease.
Coronary Angiography ; Coronary Artery Disease* ; Coronary Vessels* ; Depression* ; Electrocardiography ; Exercise Test ; Heart Rate* ; Heart* ; Humans ; Myocardial Ischemia* ; Sensitivity and Specificity

PURPOSE: To investigate the relationship between the greenstick laminar fractures and the dural tear in low lumbar burst fractures and their optimal treatment. MATERIALS AND METHODS: We enrolled 51 patients (52 cases) who had been diagnosed with low lumbar burst fracture from June 2003 to May 2007. The average age was 39 years (range, 22 to 58), 30 male patients (58.8%), and 21 female patients (41.2%). Average follow-up periods was 19 months (range, 11 to 45). Lumbar CT scan were taken 1 mm slices in precision for all patients. We judged it incomplete fracture if lumbar CT scans show loss of cortical continuity over 3 slices if there is an aggrement of two among one radiologist and two orthopaedic surgeons reached a consensus. Dural tear and entrapment of nerve root were confirmed intraoperatively by the senior surgeon. RESULTS: In 52 burst fractures, complete lamina fractures occurred in 21 cases and there were green stick laminar fractures in 14 cases. Neurologic defect has been found in 12 cases, 5 (63%) from complete laminar fractures and 3 (37%) from green stick laminar fractures. Dural tears has been detected in 9 cases (26%), 4 (19%) from complete laminar fractures and 5 (36%) from green stick laminar fractures. CONCLUSION: Dural tear and nerve root entrapment can be accompanied in patients with green stick fracture. There is necessary to consider the possibility of dural tear and nerve root entrapment before operation and to indentify carefully to the presence of nerve root entrapment during operation.
Consensus ; Female ; Follow-Up Studies ; Humans ; Male

The kidney and the brain play a major role in maintaining normal homeostasis of the extracellular fluid by neuroendocrine regulation of sodium and water balance. Therefore, disturbances of sodium balance are common in patients with central nervous system (CNS) disorders and clinicians should focus not only on the CNS lesion, but also on the potentially deleterious complications. Hyponatremia is the most common and important electrolyte disorder affecting patients with critical neurologic diseases. In these patients, the maladaptation to hyponatremia by impaired osmoregulation in pathologic lesions of brain may cause more aggressive cerebral edema and increased intracranial pressure due to hypoosmolality induced by hyponatremia. Furthermore, hyponatremia accompanied by CNS disorders has shown to increase delayed cerebral ischemia and mortality rates. Two main pathophysiologies of hyponatremia, excluding iatrogenic causes, are inappropriate secretion of antidiuretic hormone (SIADH) and cerebral salt wasting (CSW) syndrome. Differential diagnosis between these two entities can be difficult due to considerable overlap in the laboratory findings and clinical situations. SIADH is in a volume expanded status due to inappropriately secreted arginine vasopressin (AVP) and requires water restriction. However, CSW syndrome is characterized by renal sodium wasting mainly due to increased natriuretic peptides resulting in volume depletion and follows appropriate secretion of AVP. Therefore, maintenance of volume status and sodium replacement is the mainstay of treatment in CSW syndrome. In this review, we aimed to describe the regulation of sodium and water balance, and pathophysiology, diagnosis and treatment of hyponatremia in neurologic patients, especially focusing on SIADH and CSW syndrome.
Arginine Vasopressin ; Brain ; Brain Edema ; Brain Ischemia ; Central Nervous System ; Diagnosis, Differential ; Extracellular Fluid ; Homeostasis ; Humans ; Hyponatremia ; Inappropriate ADH Syndrome ; Intracranial Pressure ; Kidney ; Natriuretic Peptides ; Nervous System Diseases ; Sodium ; Water-Electrolyte Balance

PURPOSE: To introduce and assess the results of punctoplasty using a radiofrequency surgical unit for punctal stenosis. METHODS: Patients who complained of epiphora, had an intact lacrimal pathway below puncti, and underwent punctoplasty with the Ellman Surgitron F.F.P.F were evaluated in the present study. RESULTS: A total of 19 patients (31 eyes) were included in the study. The average age was 55 years (+/-15.7 years). At the last follow-up visit, 27 eyes (87%) had patent puncti, 1 eye became stenotic again, and 3 eyes were completely obstructed. Twenty-two eyes (71%) showed almost complete disappearance of dye on the fluorescein dye-disappearance test (FDDT). Twenty-five eyes (81%) had symptomatic improvement. No significant complication was reported postoperatively. CONCLUSIONS: Punctoplasty with a radiofrequency surgical unit is a simple and effective method for punctal stenosis.
Constriction, Pathologic ; Eye ; Fluorescein ; Follow-Up Studies ; Humans ; Lacrimal Apparatus Diseases

BACKGROUND: Vascular lesions can be diagnosed by biopsy, simple x-ray, ultrasound, CT, MRI, venography and MR angiography. These diagnostic tools can identify the detailed structure and abnormalities in the peri-lesional area of vascular lesions. Color Doppler ultrasound (CDU) can demonstrate the hemodynamic features, distribution of veins and arteries, shunts and structures of vascular lesions. Authors have tried to categorize vascular lesions with CDU and also applied this to the selection of treatment methods. MATERIALS AND METHODS: Forty-seven vascular lesions were evaluated by means of CDU. All patients underwent a complete clinical evaluation as well as peak systolic velocity (PSV), peak diastolic velocity (PDV), resistive index (RI) of feeding arteries. In particular, we evaluated the hemodynamic features and structures of vascular lesions. We categorized the vascular lesions and then treated them with systemic steroid, compression, SPTL1 Dye laser, steroid intralesional injection and sclerotherapy. We evaluated the clinical improvement and objective effects of treatments by CDU. RESULTS: There were 37 hemangiomas and 10 vascular malformations. Vascular lesions were classified by the hemodynamic features and structures: category Ia (infantile hemangioma, regressed infantile hemangioma), Ib (RICH), Ic (deep hemangioma, mixed hemangioma), II (arteriovenous malformation), III (venous malformation, verrucous hemangioma). The clinical improvement after treatment was associated with the decrease of PSV and RI values. The clinical improvement above 50% resolution of the lesion showed 70.9% in category Ia, 50% in Ib, 66.6% in Ic, 83.3% in II and 50% in III. CONCLUSIONS: The analysis of hemodynamic feature and structures by CDU can be helpful in the study of vascular lesions. These processes suggest CDU be a useful modality in differential diagnosis of vascular lesions and a more advantageous tool in the decision of treatment policy than the conventional modalities. And it is also useful for the evaluation of treatment effects.
Angiography ; Arteries ; Biopsy ; Diagnosis, Differential ; Hemangioma ; Hemodynamics ; Humans ; Injections, Intralesional ; Lasers, Dye ; Magnetic Resonance Imaging ; Phlebography ; Sclerotherapy ; Ultrasonography* ; Vascular Malformations ; Veins

PURPOSE: To report the outcomes of clinical analysis on the negative culture rate of normal ocular surface flora and the anterior chamber penetration after the preoperative prophylactic use of 0.3% tosufloxacin ophthalmic solution. METHODS: From July 2010 to June 2012, 38 eyes of 38 patients who were scheduled to receive intravitreal injection or cataract surgery were examined for bacterial culture positive rate using conjunctival scraping. The patients were treated with 0.3% tosufloxacin eyedrops preoperatively 5 times a day for 2 days before surgery. After the treatment, the bacterial culture negative rate based on conjunctival scraping was assessed to evaluate the drug efficacy. Of the 38 patients, 19 had cataract surgery. The concentration of tosufloxacin at anterior chamber was assessed in the 19 patients. Additionally, any side effects from the drug were monitored during the treatment. RESULTS: Among the 38 eyes, 21 eyes showed a bacterial culture positive rate before treatment. After the drug treatment, the bacterial culture negative rate was 57.1% (12/21). Coagulase-negative staphylococci were most frequently cultured in 15 (39%) of the 38 eyes before treatment and the negative rate of bacterial culture was 86.7% (13/15) after treatment. Average antibiotic residue concentrations in aqueous humor was 0.050 +/- 0.038 microg/mL. No side effects from the drug were reported during the experimental period. CONCLUSIONS: Although the 0.3% tosufloxacin eyedrops were not effective in all bacterial strains and showed relatively low penetration rate into the anterior chamber, they were effective in some gram positive organisms, particularly in coagulase-negative staphylococci of normal ocular surface flora.
Anterior Chamber ; Antibiotic Prophylaxis ; Aqueous Humor ; Cataract ; Humans ; Intravitreal Injections ; Ophthalmic Solutions

Acute kidney injury (AKI) is a common clinical syndrome that carries a poor prognosis even in cases with seemingly mild or reversible renal dysfunction. Although this potentially devastating disease is associated with increased mortality, early detection and timely intervention may improve clinical outcomes. In this regard, a standardized definition and classification of AKI, reflecting prognosis on the basis of evidence, may allow early recognition and stage-based management of the disease. Nevertheless, there has been considerable variability and inconsistency in the definition and classification of AKI, resulting in failure to bridge the gap between research and clinical practice. The definition of AKI has evolved, with the introduction of the "Risk, Injury, Failure, Loss, and End-stage renal disease" (RIFLE), and "AKI Network" (AKIN) criteria. The recent "Kidney Disease Improving Global Outcomes" (KDIGO) guidelines proposed a uniform definition of AKI, essentially merging the RIFLE and AKIN criteria. This review will focus on the definition and classification of AKI, as proposed by KDIGO in 2012, and their use in clinical practice for clinicians.
Acute Kidney Injury* ; Classification ; Mortality ; Prognosis

Respiratory syncytial virus (RSV) is the major cause of lower respiratory tract infection in infants. Life-threatening RSV infection is often reported in young children and immunocompromised hosts. Since there is no report on ribavirin therapy for RSV pneumonia in pediatric cancer patients in Korea, we report one case of RSV pneumonia that developed in an infant with acute lymphoblastic leukemia (ALL). Despite administration of oral ribavirin and intravenous immunoglobulin, the patient's respiratory distress worsened and admission to an intensive care unit was necessary. Chest x-ray showed multifocal consolidation, pneumothorax, and pneumomediastinum. Treatment with aerosolized ribavirin led to significant clinical improvement. The role of aerosolized ribavirin is still controversial, but it might have a therapeutic potential for severe RSV pneumonia in children with leukemia.
Child ; Humans ; Immunocompromised Host ; Immunoglobulins ; Infant ; Intensive Care Units ; Korea ; Leukemia ; Mediastinal Emphysema ; Pneumonia ; Pneumothorax ; Precursor Cell Lymphoblastic Leukemia-Lymphoma ; Respiratory Syncytial Viruses ; Respiratory Tract Infections ; Ribavirin ; Thorax

BACKGROUND: In aerometabolic process, the human heart mainly utilizes free acid as fuel. During anaerobic process, lactate production by the myocardium is increased and accumulates in the myocardium. Thus it decreases the contractility of myocadium. Therefore in patients with ischemic heart disease, lactate prodution must be increased by the myocardium during myocardial ischemia. During paroxysmal supraventricular tachycardia, patients frequently experience chest pain and ST segment depression suggesting acute myocardial ischemia. However it occurs on a physiologic basis independent of ischemia. The purpose of this study was to assess whether tachycardia induced by artial pacing produces myocardial ischemia in patients without evidence of ischemic heart disease. METHODS: Between May 28, 1996 and August 13, 1996, at the University of Keimyung, Dong-San Medical center, 15 patients(male 9, female 6, mean age of 38 years) with palpititation underwent electrophysiologic testing and had radiofrequency cather ablation. There were no evidence of ischemic heart disease. Right artrial pacing was done with lengths of 500msec, 400msec and 350msec in each 5 patients. A 12 lead electrdcardiogram, left ventricular enddiastolic pressure, blood from femoral artery and coronary sinus for lactate determinations and blood gas analysis were dbtained simultaneously. They were obtained at baseline, at 1, 5, 10 and 15 minute of atrial pacing and at 1, 5, 10 minute after cessation of pacing. RESULT: Significant changes were not observed in , , concentration of , pH and saturation. In all patients, mean percent lactate extraction was above 10% and not significantly changed during atrial pacing. However ST segment depression was significantly progressive during atrial pacing and according to decrease the cycle length(p<0.05), also left ventricular end-diastolic pressure was significantly decreased during atrial pacing(p<0.05). Conclusion: Therefore tachycardia induced by atrial pacing for 15 minutes did not produce myocardial ischemia in patients without evidence of ischemic heart disease. Depression of STsegment during supraventricular tachycardia or atrial pacing, in patient without underlying heart disease is necessary to inveestigate what makes this phenomenon.
Blood Gas Analysis ; Blood Pressure ; Chest Pain ; Coronary Sinus ; Depression ; Female ; Femoral Artery ; Heart ; Heart Diseases ; Humans ; Hydrogen-Ion Concentration ; Ischemia ; Lactic Acid ; Metabolism* ; Myocardial Ischemia ; Myocardium ; Tachycardia ; Tachycardia, Supraventricular