Mid-Term Outcomes in Patients Implanted with Cardiac Resynchronization Therapy

We applied cardiac resynchronization therapy (CRT) for desynchronized heart failure patients. We evaluated clinical outcomes including morbidity, mortality, and echocardiographic parameters in 47 patients with implanted CRT in Korea from October 2005 to May 2013. The combined outcomes of hospitalization from heart failure, heart transplantation and death were the primary end point. Median follow-up period was 17.5 months. The primary outcomes listed above occurred in 10 (21.3%) patients. Two patients (4.3%) died after CRT and 8 (17%) patients were hospitalized for recurrent heart failure. Among patients hospitalized for heart failure, 2 (4.3%) patients underwent heart transplantation. The overall free rate of heart failure requiring hospitalization was 90.1% (95% CI, 0.81-0.99) over one year and 69.4% (95% CI, 0.47-0.91) over 3 yr. We observed improvement of the New York Heart Association classification (3.1+/-0.5 to 1.7+/-0.4), decreases in QRS duration (169.1 to 146.9 ms), decreases in left ventricular (LV) end-diastolic (255.0 to 220.1 mL) and end-systolic (194.4 to 159.4 mL) volume and increases in LV ejection fraction (22.5% to 31.1%) at 6 months after CRT. CRT improved symptoms and echocardiographic parameters in a relatively short period, resulting in low mortality and a decrease in hospitalization due to heart failure.

A Case of Postprandial Hypotension in the Intensive Care Unit Treated With Acarbose

Postprandial hypotension (PPH) has not been described as a cause of hypotension after the return of spontaneous circulation (ROSC) in the intensive care unit (ICU). A 74 year old man underwent cardiopulmonary resuscitation (CPR) due to monomorphic ventricular tachycardia. After the ROSC, inotropic agents were not reduced but increased. PPH had occurred, according to the flow sheet, so a provocation test was performed. We noted hypotension but no serum hypoglycemia or tachycardia. The hypotension was diagnosed as PPH. We chose acarbose for treatment; thus, the inotropic agents were discontinued. This is the first case in which hypotension occurred in a patient recovering after CPR in the ICU and that the PPH was treated with acarbose. PPH should be considered and treated to manage hypotension in elderly patients in the ICU.

Percutaneous Cardiopulmonary Support for Emergency In-Hospital Cardiac Arrest or Cardiogenic Shock

BACKGROUND AND OBJECTIVES: Percutaneous cardiopulmonary support (PCPS) provides hemodynamic stability for the treatment of patients suffering with cardiogenic shock or cardiac arrest, and it can be used in a wide variety of clinical settings without the need for chest exploration. In this study, we summarize a single center's experience with performing PCPS in the patients who suffered with severe cardiopulmonary failure. SUBJECTS AND METHODS: We retrospectively reviewed 30 consecutive patients with cardiac arrest or severe cardiogenic shock who received PCPS for cardiac resuscitation from November 2003 to July 2005. The self-priming, heparin-coated circuit of the Emergency Bypass System(R) was used in all the patients. Cannulation was performed via the femoral artery and vein with using an arterial (17 to 21 French) and venous cannula (21 to 28 French), percutaneously or with a small incision. RESULTS: The Indications for PCPS were: ischemic heart disease before coronary revascularization, myocardial disease, PCI-associated complications and post-operative hemodynamic collapse. Of the 30 patients we evaluated, 19 patients (63%) were successfully weaned off of the PCPS; 14 of these patients (47%) were later discharged from the hospital. For the survivors, the time interval from cardiac arrest or severe cardiogenic shock to the onset of PCPS was significantly shorter (p=0.01), and the urine output for the initial 24 hours was significantly higher (p=0.04). CONCLUSION: This retrospective analysis demonstrates the effectiveness of using PCPS for the treatment of critically unstable patients with cardiac arrest or cardiogenic shock. Larger scale studies of PCPS are now needed to confirm these findings.

The Changes of Pacing Lead Impedance Over Time: Differences in the Atrial and Ventricular Leads

BACKGROUND AND OBJECTIVES: It has been suggested that lead impedance measurements with using real-time telemetry may offer a good estimation of the lead system integrity, and the serial measurement of the pacing lead impedance over time is a useful tool to monitor the pacing lead performance. However, there has been no consistent data about the changes of lead impedance over time. Therefore, we investigated the correlation of the direct lead impedance and the telemetered lead impedance, and the changes of lead impedance over time in both the atrial and ventricular leads. SUBJECTS AND METHODS: The direct and telemetered lead impedances were measured at the time of the initial implantation. One-hundred and five patients (mean age: 62.5+/-13.5 years, 47 males, 47 atrial leads and 105 ventricular leads) who were without lead failure for more than 4 years since the initial implantation were included in the study. Afterwards, the telemetered lead impedance was examined at 2-month and at 12-month after implantation and then annually for 4 years in all the patients at a pacemaker clinic. RESULTS: At the initial implantation, the direct lead impedance and the telemetered lead impedance were 470.2+/-12.2omega and 540.9+/-11.6omega, respectively, in the atrial leads (r=0.72, p<0.01) and 623.7+/-14.6omega and 717.1+/-17.3omega, respectively, in the ventricular leads (r=0.82, p<0.01). In the atrial leads, the mean telemetered lead impedance rose to 583.0+/-14.0omega (p<0.01 vs baseline) at 2 months and it stabilized thereafter (p=NS). In contrast, the mean lead impedance was decreased to 653.6+/-15.6omega (p<0.01 vs baseline) at the 2-month follow-up, and then it stabilized in the ventricular leads (p=NS). CONCLUSION: There was a good correlation between the direct and telemetered lead impedance, and there was a different tendency for the change of lead impedance during the lead maturation between the atrial and ventricular leads. The telemetered lead impedance was substantially stable since the 2 months after the implantation.

Risk Factors and Predictors for the Progression of Carotid Atherosclerotic Stenosis in Korean Adults

BACKGROUND AND OBJECTIVES: The goals of this study were to investigate the prevalence and risk factors of carotid atherosclerotic stenosis and also the predictors for the progression of carotid atheroslcerotic stenosis in Korean adults. SUBJECTS AND METHODS: Carotid ultrasonography was performed for 22,782 adults who volunteered for a routine health check-up. Carotid atheroslcerotic stenosis was defined as a finding of at least one lesion of an intima-media thickness greater than 1.2 mm with atherosclerotic plaque. Among the 22,782 people, 4,077 persons underwent follow-up carotid ultrasonography at an average interval of 27.6 months. The past medical history and information on the cardiovascular risk factors were obtained from standardized questionnaires and the subjects' blood chemistry. RESULTS: Carotid atheroslcerotic stenosis was detected in 1,875 adults (8.2%) and it was significantly associated with a history of stroke, hypertension, heart disease, hyperlipidemia, higher HbA1C, older age, a wider pulse pressure, lower HDL-cholesterol and a large amount of smoking (p<0.05). In the subjects without history of stroke (22,444 persons), those with more than 5 risk factors showed a higher prevalence (36.8%) of carotid atherosclerotic stenosis than those with a history of stroke (29.0%). The independent predictors of stenosis progression were older age, male gender, hypertension, a large amount of smoking, a high LDL cholesterol level, a low HDL-cholesterol level and a high fibrinogen level (p<0.05). CONCLUSION: Carotid ultrasonographic screening for a population with these risk factors will lead to a more efficient screening process and our identification of the predictors of disease progression may help to design therapeutic trials for preventing the progression of carotid atherosclerotic stenosis.

Analysis of Underlying Diseases in Elderly Patients with Atrial

BACKGROUND: Atrial fibrillation(AF) is the common and importand arrhythmia in the eldery. Because the distribution of cardiovascular disease changes according to age group and era, the distribution of underlying diseases in patients with AF also tends to change. The purpose of this study is to identify the difference between the eldery(> or = 65yr) and the young adult(<65yr) patients with AF in distribution of underlying disease. METHODS: 218 patients with AF diagnosed by routine EKG and Holter minitoring from Jan. 1996 to Dec 1998 in National Medical Center was evaluated. Their medical records were reviewed retrospectively in aspect of age, sex, developmental form & underlying disease of AF. In detail. last two subjects were investigated in two separate age group and at the same time, relation between them studied. RESULTS: The majority of age group with AF was 65~74yr(40.4%) and the eldery patient was 59.7%. Acute paroxysmal form and chronic persistent form was 21.1% and 78.9% respectively. There was no significant difference in development form of AF between the eldery and young adult group(chi2=1.45, p=0.227) The common underlying disease were hypertension(33.4%), congestive heart failure(32.1%), rheumatic valvular heart diseas(20.2%). ischemic heart disease(14.2%), hyperthyroidism(6.9%), COPD(4.1%), and lone AF(10.1%). In the eldery patients. hypertension is the most common underlying disease(42.3%) and congestive heart failure, ischemic heart disease, rheumatic valvular heart disease, and COPD were 36.2%, 21.5%, 10.8%, 6.9% respectively. In the young adult group-, rheumatic valvular heart disease was the most common(34%), and congestive heart failure, hypertension, ischemic heart disease, and hyperthyroidism were 26.1%, 20,5%, 3.4%, 10.2% respectively(chi2 = 62.71, p = 0.000). wheares ischemic heart disease, COPD, hyperthyroidism, stress, trauma, acute alcohol intoxication and lone AF were more common in acute paroxysmal AF, but hypertension, congestive heart failure, reumatic valvular heart disease were more common in chronic persistent AF(chi2 = 93.75, p = 0.000). CONCLUSION: Among underlying disease of AF. hypertension, congestive heart failure, ischemic heart disease were markedly increased and rheumatic valvular heart disease was decreased than previous reports in Korea. Hypertension, congestive heart failure, ischemic heart disease, COPD were more common in the eldely and as to rheumatic valvular heart disease, hyperthyroidism, and lone AF were in the young adult. Thus it showed significant difference in underlying desease between the eldery & the young adult as well as acute paroxysmal & chronic persistent form.

Effects of Dialyzer Reuse on Clearances of Blood Urea Nitrogen and beta2-Microglobulin in the Three Different Membranes / 대한신장학회잡지

BACKGROUND: We performed the study on the changes of beta2-microglobulin(beta2M) clearance and urea reduction ratio after reuse of dialyzers with three different membranes. METHODS: 9 patients who had received regular hemodialysis more than five years were enrolled. Three kinds of dialyzer membrane were used; i.e. : Two of them were high-flux and the other was low-flux. Dialyzer reprocessing was performed by an automated machine using glutaraldehyde and bleach. Each dialyzer was reused 10 times. Solute clearance was determined for each dialyzer after the 1st, 5th, 8th and 10th reuse. RESULTS: Urea clearance was well maintained after reuse with both high-flux and low-flux membrane but beta2M clearance was significantly greater with high-flux dialyzers than low-flux dialyzer. Effects of each dialyzer reuse on beta2M clearance showed no significant decrease until the 10th reuse and no significant difference in beta2M clearance between the two high-flux dialyzers(polyamide vs PEPA membrane, p= 0.197). CONCLUSION: Reuse of dialyzers was cost-effective. After reuse of dialyzer, clearance of solute was maintained in both small and large solutes until the 10 th reuse. Further study is needed regarding the maintenance of solute clearance with increased number of reuses.

Age-related trend of diseases distribution in the elderly aged 60 years and older / 대한내과학회지

With increasing life expectance and improvement of the overall health of the elderly, the understanding of geriatric disease becomes an important aspect of medical services. In the elderly, the frequencies of hypertension, DM, & anemia are increased according to aging and renal function is decreased progressively. As screening test for cervical cancer Papanicolaou smear is recommended due to its cost-effective benefits in females. In age-adjusted elderly male and female study populations, authors investigated the alterations of the above diseases, hypercholesterolemia, liver disease, obesity, & proteinuria distributions. METHODS: This study included 1,181 aged 40 years (600 males, 581 females) visitors between January 1, 1997 and December 31, 1997 in National Medical Center, Seoul, South Korea. Authors divided these populations into two large groups such as group A and B. Group A was composed of 40-59 years, group B 60 years and older. Group A and B were subdivided into 4 subgroups each other, such as A-1, A-2, A-3 and A-4, B-1, B-2, B-3 and B-4 by means of age-adjusted dividing scale. We used our inclusion criteria to define each disease. RESULTS: Hypertension was the most common disease in males of group B, but obesity was in females. The age-adjusted frequencies of hypertension, anemia, obesity & proteinuria were increased according to aging in the elderly aged 60 years and older. Though hypercholesterolemia revealed non-specific distribution in each group, increased frequency was observed in females compared to males in group B. With increasing their age, abnormal findings of Papanicolaou smear were found in females of group B. CONCLUSIONS: As the frequencies of hypertension, anemia, obestiy, proteinuria & abnormal findings of Papanicolaou smear were increased in the elderly aged 60 years and older as increasing their age. Much more attentions and follow up plans for these disease should be needed in the elderly.

Two Cases of Respiratory Failure After Recovery of Cholinergic Crisis in Organophosphate Poisoning: The Intermediate Syndrome / 결핵

Respiratory failure is the most serious manifestation and usual cause of death in acute organophosphate poisoning, and is common in acute cholinergic crisis. But the respiratory failure may appear suddenly in a patient who is recovering from the cholinergic crisis, even while receiving conventional therapy. These are case report of 37 years old male and 24 years old female with intermediate syndrome in organophosphate poisoning. The two patients ingested organophosphate(fenthion and mixture of DDVP with chlorpyrifos respectively) incidentally and in a sucide attempt respectively. After apparent recovery from the cholinergic crisis with a conventional therapy but before the expected onset of delayed polyneuropathy , the respiratory failure appeared suddenly with a muscular weakness, affecting predominantly the proximal limb muscles, neck flexors, territories of several motor cranial nerves. The two patients needed mechanical ventilatory support and recovery from the intermediate syndrome was complete in both patients, although one subsequently developed hypoxic encephalopathy. The clinical manifestation and electrophysiologic study support the clinical diagnosis of intermediate syndrome. The syndrome carries a risk of death, because of respiratory paralysis, if not recognized early and treated adequatedly. Prompt endotrachial intubation and mechanical ventilatory support is the cornerstone of treatment of the intermediate syndrome. Therefore, all patient should be observed in a hospital for up to 5 days after poisoning.