Effect of Peritoneal Dialysis Modality on the 1-Year Rate of Decline of Residual Renal Function

PURPOSE: The effect of different peritoneal dialysis (PD) modalities on the decline in residual renal function (RRF) is unclear due to inconsistencies among studies. In particular, the effect of automated peritoneal dialysis (APD) modalities [continuous cyclic peritoneal dialysis (CCPD) and nightly intermittent peritoneal dialysis (NIPD)] on RRF has not been examined in a large cohort. MATERIALS AND METHODS: We conducted a single-center retrospective study to investigate the association between PD modalities and decline in RRF in 142 incident PD patients [34 on CCPD, 36 on NIPD, and 72 on continuous ambulatory peritoneal dialysis (CAPD)]. RRF was measured within 2 months from PD start and at 1 year after PD initiation. RESULTS: The RRF at 1 year after PD initiation was 1.98+/-2.20 mL/min/1.73 m2 in CCPD patients and 3.63+/-3.67 mL/min/1.73 m2 in NIPD patients, which were moderately lower than 4.23+/-3.51 mL/min/1.73 m2 in CAPD patients (p=0.064). Moreover, there was no significant difference in the 1-year rate of decline of RRF between CCPD and NIPD patients, although APD patients had a faster 1-year RRF decline rate than CAPD patients (CCPD and NIPD vs. CAPD: -45.68 and -36.69 vs. 1.17%/year, p=0.045). APD was associated with a more rapid decline in RRF in patients with end-stage renal disease undergoing PD, although multivariate analysis attenuated the significance of this finding (beta=-31.50; 95% CI, -63.61 to 0.62; p=0.052). CONCLUSION: Our results suggest that CAPD might be more helpful than APD for preserving RRF during the first year of dialysis therapy, although there was no significant difference in the 1-year rate of decline of RRF between the two APD modalities.

Clinical Features of Non-alcoholic Fatty Liver Disease in Cryptogenic Hepatocellular Carcinoma / 대한소화기학회지

BACKGROUND/AIMS: Nonalcoholic fatty liver disease (NAFLD) may be one of the important causes of cryptogenic hepatocellular carcinoma (HCC). The aim of this study was to evaluate whether patients with cryptogenic HCC share clinical features similar to that of NAFLD. METHODS: Cryptogenic HCC was defined as HCC that occurs in patients with the following conditions: HBsAg(-), anti-HCV(-), and alcohol ingestion of less than 20 g/day. All patients diagnosed with cryptogenic HCC from 2005 to 2012 (cryptogenic HCC group), and all patients diagnosed with HBV associated HCC between 2008 and 2012 (HBV-HCC group) were enrolled in the present study. Clinical features, BMI, lipid profiles, presence of diabetes mellitus, hypertension, and metabolic syndrome were compared between the two groups. RESULTS: Cryptogenic HCC group was composed of 35 patients (19 males and 16 females) with a mean age of 70+/-11 years. HBV-HCC group was composed of 406 patients (318 males and 88 females) with a mean age of 56+/-7 years. Patients in the cryptogenic HCC group were older (p=0.001) and female dominant (p=0.042) than those in the HBV-HCC group. There were no differences in the laboratory test results including lipid profiles and Child-Turcotte-Pugh class between the two groups. Patients in the cryptogenic HCC group had higher prevalence of diabetes (37% vs. 17%, p=0.015), hypertension (49% vs. 27%, p=0.051), metabolic syndrome (37% vs. 16%, p=0.001), and higher BMI (25.3 kg/m2 vs. 24.1 kg/m2, p=0.042) than those in the HBV-HCC group. The tumor stage was more advanced (stage III and IV) at diagnosis in the cryptogenic HCC group than in the HBV-HCC group (60% vs. 37%, p=0.007). CONCLUSIONS: Cryptogenic HCC has clinical features similar to that of NAFLD and is diagnosed at a more advanced tumor stage.

Membranous glomerulonephritis in a patient with myelodysplastic syndrome-refractory cytopenia with multilineage dysplasia

A 74-year-old woman presented with edema in the lower extremities. Laboratory tests revealed anemia, thrombocytopenia, hypoalbuminemia, hypercholesterolemia, and nephrotic-range proteinuria. Myelodysplastic syndrome-refractory cytopenia with multilineage dysplasia (MDS-RCMD) was confirmed by bone marrow biopsy. Renal biopsy demonstrated membranous glomerulonephritis (MGN), stage I. Based on these clinicopathologic results, she was diagnosed as having MGN with MDS-RCMD. This is a rare case report of MGN in a parient with MDS-RCMD featuring nephrotic syndrome.

Comparison of Rifabutin- and Levofloxacin-based Third-line Rescue Therapies for Helicobacter pylori / 대한소화기학회지

BACKGROUND/AIMS: There is increasing need for third-line therapy of Helicobacter pylori due to increasing level of antibiotics resistance. The aim of this study was to compare rifabutin and levofloxacin rescue regimens in patients with first- and second-line Helicobacter pylori eradication failures. METHODS: Patients, in whom a first treatment with proton pump inhibitor-clarithromycin-amoxicillin and a second trial with proton pump inhibitor-bismuth-tetracycline-metronidazole had failed, received treatment with either rifabutin or levofloxacin, plus amoxicillin (1 g twice daily) and standard dose proton pump inhibitor. Eradication rates were confirmed with 13C-urea breath test or rapid urease test 4 weeks after the cessation of therapy. RESULTS: Eradication rates were 71.4% in the rifabutin group, and 57.1% in the levofloxacin group, respectively. Although there was no significant difference in Helicobacter pylori eradication rates between two groups (p=0.656), rifabutin based regimen showed relatively higher eradication rate. CONCLUSIONS: Helicobacter pylori eradication rates of rifabutin- or levofloxacin-based triple therapy could not achieve enough eradication rate. Further studies would be needed on combination of levofloxacin and rifabutin-based regimen or culture based treatment.

A Case of the Minimal Change Nephropathy Associated with Small Cell Lung Cancer / 결핵및호흡기질환

Nephrotic syndrome is a relatively rare complication of malignancy. A few cases of nephrotic syndrome accompanying Hodgkin's disease, non-Hodgkin lymphoma, leukemia and other malignancies have been reported since the first case of the nephrotic syndrome associated with extrarenal malignancy was reported in 1922. Hodgkin's disease and solid tumors are known to be the most common malignancies accompanying nephrotic syndrome. The pathologic findings of kidney in patients with Hodgkin's disease commonly show minimal change nephropathy. Membranous glomerulonephropathy is the most common pathologic feature in patients with solid tumors. Although membranous glomerulonephropathy related to small cell lung cancer has rarely been reported in Korea, minimal change nephropathy accompanying small cell lung cancer has never been reported. We present here a case of a 70 year-old male with minimal change nephropathy that was related to small cell lung cancer. We detected small cell lung cancer during the diagnosis work-up of nephrotic syndrome. We suggest that nephrotic syndrome can be a manifestation of underlying malignancy.

Comparison of Various Methods for Estimating Glomerular Filtration Rate in Patients with Chronic Kidney Disease / 대한신장학회지

PURPOSE: Several methods are used to estimate glomerular filtration rate (GFR), but there are limitations in each method. We investigated the variation in GFR measured by different methods in patients with chronic kidney disease (CKD). METHODS: 549 patients with CKD stages 2-5, who underwent creatinine clearance (Ccr) and (99m)Tc-DTPA renal scan, were enrolled. GFR was calculated by using Cockcroft-Gault equation (CG-GFR) and MDRD equation (MDRD-GFR). The correlations between MDRD-GFR and GFR estimated by other methods were analyzed according to CKD stages and age groups ( or = 60 years). RESULTS: The mean age of patients was 55+/-19 year (male 60%). CG-GFR, Ccr, and estimated GFR by (99m)Tc-DTPA renal scan (DTPA-GFR) correlated significantly with MDRD-GFR in all CKD stages and all age groups (p<0.01). Compared to patients with stages 2-4 CKD, however, the possibilities of CGGFR, Ccr, and DTPA-GFR to be within 30% of MDRD-GFR were significantly lower in stage 5 CKD patients (p<0.05). In addition, the ratio of DTPA-GFR/MDRD-GFR in stage 5 CKD patients was 2.24+/-1.40, indicating overestimation of DTPA-GFR in these patients. On the other hand, the accuracy of various GFR-estimating methods was higher in patients aged more than 60 years compared to the others. CONCLUSION: CG-GFR, Ccr, and DTPA-GFR correlated significantly with MDRD-GFR, but there was a wide variation in GFR estimated by various methods. Therefore, a careful interpretation of estimation in GFR is needed according to the stage of CKD and the age of patients.

Changes in Skin Color in Hemodialysis Patients According to Dialysis Modality / 대한신장학회지

PURPOSE: Skin hyperpigmentation in end stage renal disease patients is known to be attributed to the accumulation of middle molecular weight (MMW) substances such as urochromic pigments and carotenoids. Therefore, there is a possibility that hyperpigmentation may be improved by high-flux hemodialysis (HF-HD) and online hemodiafiltration (HDF). This prospective study was undertaken to investigate the quantitative changes in skin color in HD patients according to dialysis modality. METHODS: Eighty-two stable ESRD patients undergoing HD were enrolled and divided into three groups according to their dialysis modality. Melanin index and erythema index of forearm and abdomen (nonsun exposed area), and forehead (sun exposed area) were measured by narrow-band reflectance spectrophotometer at baseline and after 12 months. RESULTS: There were no significant differences in the baseline values of melanin and erythema indices among the three groups. But the changes in forehead melanin index were significantly lower in HDF patients (-1.0+/-2.4%) compared to the LF-HD group (0.3+/-1.6%) (p<0.05), and forehead erythema index was significantly decreased in patients treated by HDF (-1.6+/-2.5%) relative to the lowflux hemodialysis group (-0.1+/-2.5%) (p<0.05). CONCLUSION: The changes in skin color of sun exposed area were reduced by HDF, suggesting that enhanced removal of MMW substances by convective therapy may be of advantage to skin hyperpigmentation in ESRD patients.

A comparison study between mycophenolate mofetil and cyclophosphamide for treatment of proliferative lupus nephritis / 대한내과학회지

BACKGROUND/AIMS: Our study aimed to evaluate the efficacy of MMF as compared with intravenous cyclophosphamide as induction therapy for proliferative lupus nephritis in Koreans. METHODS: Forty-three patients who were diagnosed with proliferative lupus nephritis (WHO Class III and IV) between Jan 2000 and Dec 2006 were included in this study. Nineteen patients were treated with oral MMF (initial dose: 1.0 g/day and then it was increased to 2.0 g/day) and 24 patients were treated with 0.75-1.0 g/m2 of monthly intravenous cyclophosphamide (CP) followed by subsequent treatment with oral corticosteroid (initial dose 1 mg/kg/day and then it was slowly tapered down) for 6 months. The demographic and laboratory findings, the response rate and the adverse events were reviewed retrospectively and these were compared between the two groups. RESULTS: A complete response occurred in 7 out of the 19 patients (36.8%) treated with MMF and in 8 out of the 24 patients (33.3%) treated with CP, and the difference was not significantly different between the two groups (p=0.66). A partial response was achieved in 52.6% and 45.8%, respectively. There were no significant differences of the laboratory findings such as serum albumin, C3, C4, the urine protein/creatinine ratio and serum creatinine after treatment for 6 months. In addition, both groups had similar rates of adverse events. CONCLUSIONS: Our study showed that for the treatment of lupus nephritis, MMF was as effective as IV cyclophosphamide with similar adverse events. This finding suggests that MMF could be an alternative treatment for active lupus nephritis as induction therapy.

A case of emphysematous pyelonephritis in a non-diabetic patient / 대한내과학회지

Emphysematous pyelonephritis is characterized by acute necrotizing renal parenchymal infection with gas formation. It is a serious, life-threatening infection that tends to occur in patients with diabetes mellitus and/or urinary tract obstruction. Early diagnosis and prompt intervention combined with surgical and medical treatment are required for survival. In Korea, there have been a number of cases of emphysematous pyelonephritis reported in patients with diabetes mellitus or urinary tract obstruction. We describe a case of emphysematous pyelonephritis in a patient without diabetes mellitus or urinary tract obstruction.

A Case of Surgical Treatment of Tuberculous Cholangitis and Lymphadenitis with Obstructive Jaundice due to Progressive Stricture of Bile Duct / 대한소화기내시경학회지

Obstructive jaundice is most commonly attributed to a malignancy or stones affecting the common bile duct. Biliary tuberculosis and lymphadenitis around the periportal area have also been implicated but cases are quite rare. A 24 year old man presented with jaundice and abdominal pain for 3 days. Abdominal CT and ERCP revealed a stricture of the extrahepatic bile duct with multiple enlarged lymph nodes showing necrotic foci located at the periportal area. The colonoscopic biopsy showed evidence of M. tuberculosis. The patient was treated with ERBD insertion and oral anti-tuberculosis therapy. However, the abdominal pain recurred and there was progressive stenosis of the common bile duct. A bile duct resection with choledochojejunostomy was subsequently performed. Frozen sections revealed granulomatous inflammation with caseation necrosis, which was consistent with tuberculosis. We report a case of tuberculous cholangitis and lymphadenitis with obstructive jaundice that was managed surgically due to the progressive stricture of the bile duct.

A Case of Adult Hemorrhagic Varicella with Pneumonia / 감염과화학요법

Chickenpox is a common benign childhood disease caused by varicella-zoster virus, typically associated with fever and a characteristic exanthematous vesicular rash. The clinical manifestations in adults are more severe and more commonly complicated with varicella pneumonia. Hemorrhagic varicella, also called malignant chickenpox, is very rare and potentially fatal. Bleeding can occur in the form of hemorrhages within the rash and surrounding skin or within the mucous membrane. We report a case of hemorrhagic varicella complicated with pneumonia in a immunocompromised host. We emphasize on the successful treatment with continuous acyclovir infusion.

A Case of Spondylodiskitis Caused by Injection Site Infection with Methicillin-Resistant Staphylococcus aureus / 감염과화학요법

Infections of the intervertebral disc and adjacent vertebrae may present with spondylitis, discitis and spondylodiscitis and are hematogenous origin in most cases. Potential sources of hematogenous infection are skin and soft tissue infection, genitourinary tract infection, infective endocarditis, intravenous drug abuse, respiratory tract infection and infected intravenous injection site. We have experienced a case of pyogenic spondylitis caused by methicillin-resistant Staphylococcus aureus (MRSA) bacteremia with peripheral injection site infection. He was successfully treated with surgical debridement and antibiotics.

A Case of Adult Hemorrhagic Varicella with Pneumonia / 감염과화학요법

Chickenpox is a common benign childhood disease caused by varicella-zoster virus, typically associated with fever and a characteristic exanthematous vesicular rash. The clinical manifestations in adults are more severe and more commonly complicated with varicella pneumonia. Hemorrhagic varicella, also called malignant chickenpox, is very rare and potentially fatal. Bleeding can occur in the form of hemorrhages within the rash and surrounding skin or within the mucous membrane. We report a case of hemorrhagic varicella complicated with pneumonia in a immunocompromised host. We emphasize on the successful treatment with continuous acyclovir infusion.

A Case of Spondylodiskitis Caused by Injection Site Infection with Methicillin-Resistant Staphylococcus aureus / 감염과화학요법

Infections of the intervertebral disc and adjacent vertebrae may present with spondylitis, discitis and spondylodiscitis and are hematogenous origin in most cases. Potential sources of hematogenous infection are skin and soft tissue infection, genitourinary tract infection, infective endocarditis, intravenous drug abuse, respiratory tract infection and infected intravenous injection site. We have experienced a case of pyogenic spondylitis caused by methicillin-resistant Staphylococcus aureus (MRSA) bacteremia with peripheral injection site infection. He was successfully treated with surgical debridement and antibiotics.

A Comparative Cross-sectional Study of the Development of Hepatocellular Carcinoma in Patients with Liver Cirrhosis Caused by Hepatitis B Virus, Alcohol, or Combination of Hepatitis B Virus and Alcohol / 대한소화기학회지

BACKGROUND/AIMS: Alcohol may be a cocarcinogen in patients with chronic viral hepatitis. We investigated the effect of alcohol on the development of hepatocellular carcinoma (HCC) in liver cirrhosis (LC) caused by hepatitis B virus (HBV). METHODS: All patients with LC or HCC associated with HBV or alcohol, admitted between March 2001 and June 2005, were included. Patients were divided into three groups according to the etiology of LC: Alcohol (AL), HBV, or HBV+alcohol (HBV+AL). Age and laboratory data at the enrollment of study were analyzed. The logistic regression coefficiency for the prevalence of HCC was calculated by using variables such as age, gender, serologic markers, and etiology of LC. RESULTS: In LC patients (n=342), the proportions of AL, HBV, and HBV+AL groups were 44%, 39%, and 17%, respectively. The proportions of HCC in AL, HBV and HBV+AL groups were 17%, 55%, and 76%, respectively. Age at the diagnosis of HCC was younger in HBV+AL than in AL group (p=0.036). In logistic regression analysis for the risk factor of HCC, odds ratio of age was 1.056 (p<0.001). Odds ratios of HBV and HBV+AL group comparing AL were 8.449 (p<0.001) and 17.609 (p<0.001), respectively. Therefore, old age and chronic alcohol intake in patients with HBsAg were the risk factors of HCC. CONCLUSIONS: Chronic alcohol intake may be an additive factor for the development of HCC in patient with LC caused by HBV. However, a prospective cohort study is needed to confirm these findings.

A Pilot Study of Cisplatin, Irinotecan, Leucovorin and 5-fluorouracil (PILF) Combination Chemotherapy for Advanced Gastric Cancer / Journal of the Korean Cancer Association, 대한암학회지

PURPOSE: Irinotecan, in combination with leucovorin/ 5-fluorouracil (FU) or with cisplatin, is known to be active for treating advanced gastric cancer (AGC). This pilot study evaluated a novel three-drug combination of irinotecan, leucovorin/FU and cisplatin as a first-line treatment of AGC. The primary endpoint was to assess the feasibility in anticipation of conducting a larger phase II study. MATERIALS AND METHODS: Chemotherapy-naive AGC patients received irinotecan 150 mg/m2 on day 1, and leucovorin 200 mg/m2 and a 22-h infusion of FU 1000 mg/m2 on days 1 and 2. Cisplatin 30 mg/m2 was administered on day 2. Treatment was repeated every 2 weeks until disease progression or unacceptable toxicity. RESULTS: Of the 17 eligible patients, two patients had an ECOG performance status of 2 and their median age was 48 years (range: 31 to 69). A total of 117 chemotherapy cycles were delivered (median: 6, range: 1 to 12). The causes of treatment discontinuation were disease progression in 9 patients (53%), refusal (35%) and toxicity (12%). Although grade 3 or 4 neutropenia (41% of patients) was the major toxicity that required dose adjustments, only one episode of febrile neutropenia occurred. Grade 3 or 4 nausea and vomiting, diarrhea and fatigue were observed in 35%, 35% and 29% of patients, respectively. None of the patients died of toxicity during treatment. Of the 16 patients who were evaluable for response, 7 (44%) experienced a partial response. CONCLUSION: This novel multi-drug combination was tolerated well in patients with AGC. Based on the encouraging efficacy and tolerability, a randomized phase II study is ongoing in this disease setting.

Usefulness of the Carotid Ultrasonography to Predict the Severity of Coronary Artery Stenosis

BACKGROUND: High-resolution carotid ultrasonography is considered a fundamental technique for the investigation of the vascular system. However, it is still very unclear whether ultrasonographic studies of carotid arteries are useful for the prediction of cardiovascular events in patients with coronary heart disease. We have tried to assess the usefulness of carotid ultrasonography to predict the severity of coronary artery stenosis in the patients with ischemic heart disease. METHODS: We studied in 80 patients(53 men, 27 women) with acute chest pain, mean ages 63.1 10.8 yr(35 to 84 yrs), who underwent both coronary angiography and carotid ultrasonography with 10 MHz transducer. The patients who had received revascularization procedure were excluded. We classified the patients into two groups, the control group without significant coronary stenosis(23 patients) and the coronary artery disease(CAD) group(57 patients) with significant stenosis(>50%). The intima-media thickness (IMT) was measured in the far wall of CCA at 10 mm proximal to carotid bulb and the abnormal IMT was defined when the measurement was greater than mean IMT+2 SD of control group(>0.99 mm). Serum total cholesterolQlC), low density lipoprotein(LDL), high density lipoprotein(HDL), triglyceride(TG) and lipoprotein (a) (LP(a)) were measured and history of hypertension, diabetes mellitus, and smoking were investigated. RESULTS: A significant difference in IMT of the CCA was found between control and CAD group(0.75+/-0.12mm vs. 1.02+/-0.34 mm; p<0.001). Also a significant difference in the existence of plaque(control; 26.1% vs. CAD; 73.7%, p<0.00l) and the number of plaque(control; 0.39+/-0.94 vs. CAD; 2.20+/-1.87 p<0.001) was found. The existence and number of carotid plaque were more conelated with coronary artery stenosis severity than carotid IMT. The sensitivity of IMT for prediction of significant CAD was 42.1%, the specificity 95.7%, the positive predictive value 96%, and the negative predictive value 40%. The sensitivity of plaque presence on the carotid artery for prediction of CAD was 73.7%, the specificity 73.9%, the positive predictive value 87.5% and the negative predictive value 53.1%. Among the risk factors, age and LP(a) were correlated with IMT of CCA, and diabetes, hypertension, age were correlated with the presence of plaque. Smoking and hypertension were correlated with coronary artery disease. CONCLUSION: Carotid atherosclerosis was significantly correlated with severity of coronary atherosclerosis. We therefore suggest that carotid ultrasonography is useful to predict the severity of coronary artery stenosis and that the best index of coronary artery stenosis severity may be carotid plaque rather than carotid intima-media thickness.

Arotic Atherosclerotic Plaques as a Potential Embolic Sources in Patients with Cryptogenic Stoke

BACKGROUND: The atherosclerotic plaque in the thoracic aorta has been considered as a potential source of cerebral or peripheral embolization. Especially, complex type of atherosclerotic plaques in the thoracic aorta have strongly been associated with cerebral embolism in ischemic stroke and transesophageal echocardiography(TEE) is a useful diagnostic tool for evaluation of thoracic aorta atherosclerosis. The aim of this study was to evaluate the prevalence and significance of complex type of thoracic atherosclerotic plaques in the patients with cryptogenic stroke who have neither cardiac source nor significant carotid atherosclerosis. METHOD: From 1993 to 1998, TEE and carotid Doppler sonography were performed in 58 consecutive patients with ischemic stroke and in 30 control patients without ischemic stroke. We divided the former into two groups. One is known-cause stroke(n=37) group and the other is Cryptogenic stroke group(n=21). We evaluated cardiogenic source of embolism, thoracic aorta atherosclerotic plaques as well as carotid atherosclerosis by carotid Doppler sonography and TEE. Aortic atherosclerosis was classified as grade 1: normal-appearing aortic intima, grade 2: extensive intimal thickening, grade 3: sessile atheroma protruding 5mm, and grade 5: mobile atheroma. Carotid atherosclerosis was categorized as significant if luminal stenosis of either common carotid artery or internal carotid artery is greater than 50%. RESULTS: 1) There was no statistically significant difference among the three groups in age, gender, diabetes mellitus, hyperlipidemia and smoking. 2) Hypertension was more common in the cryptogenic stroke group(p<0.05). Atrial fibrillation was more common in the known-cause and control group than in the cryptogenic group(p<0.005). 3) The carotid atherosclerosis was found in 7(12%) out of 58 consecutive patients with ischemic stroke. 4) The thoracic aortic atherosclerotic plaque was located primarily on descending aorta. The complex type of plaque was found in 8(38%) out of 21 patients with cryptogenic stroke. The complex type of plaque was found in 10(27%) out of 37 patients with known-cause stroke. The complex type of plaque was found in 3(10%) out of 30 patients with known-cause stroke. CONCLUSION: These results suggest that complex type of thoracic atherosclerotic plaques in cryptogenic stoke can be considered as potential source of ischemic stroke and we suggest that a patient with cerebral embolism without a source identified by the routine transthoracic echocardiograpy or carotid sonography shoud undergo transesophageal echocardiography to evaluate the thoracic aorta atheroma.

A Case of Descending Thoracic Aortic Pseudoaneurysm Associated with Thoracolumbar Pedicle Screw Removal

Vascular injuries after spine surgery may result in acute life-threatening hemorrhage, chronic arteriovenous fistula, or pseudoaneurysm formation. The interval between injury and rupture may range from seconds to years, and accordingly, a high index of suspicion is needed to make the diagnosis. Although acute and delayed vascular injury caused by placement of posterior pedicle screw fixation has been reported, the potential for large vessel disruption during posterior pedicle screw removal has been rarely reported. This case report concerns a 50-year-old man who developed an descending thoracic aortic pseudoaneurysm after posterior pedicle screw removal, diagnosed by chest computed tomography(CT) scan and transesophageal echocardiography(TEE).

Usefulness of Dobutamine Stress Echocardiography for Identification of Viable Myocardium in Acute Myocardial Infarction

BACKGROUND: In patients with acute myocardial infarction(MI), dysfunctional myocardium at rest after successful reperfusion may represent either necrotic or viable myocardium. And the latter can be recovered contractility after revascularization or medication. OBJECTIVE: To evaluate the efFectiveness of the dobutamine stress echocardiography(DSE) for identifying viable but dysfunctional myocardium in acute MI before revascularization. METHOD: Twelve patients with acute MI after thrombolytic therapy underwent Tc-99m-tetrofosmin dipyridamole myocardial SPECT(Single Photon Emission Computed Tomography) and DSE before coronary angiography in 7~12 hospital days, and they were followed up for recovery of contractile reserve by two-dimensional echocardiography after revascularization procedure or medication. Regional wall motion abnorrnality was scored from l(normal) to 4(dyskinesia). Dobutamine responsiveness was defined as irnprovement or aggravation of regional wall motion in dyssynergic segment during any stage of dobutamine infusion. Reversible ischemia by SPECT was defined as increased perfusion defect after dipyridamole and interpreted by radiologist. Dobutamine responsiveness on DSE and reversible ischemia on myocardial SPECT were matched and compared each other. RESULTS: Of 69 dyssynergic segments, 38(55%) recovered contractility during follow up echocardiography after revascularization or medication. In 30(79%, sensitivity) of these latter segments, regional wall motion had changed during dobutamine. However, 31(45%) did not recovered contractility and 25(81%, specificity) of thern had not changed during dobutamine. Of 36 dobutamine responsive dyssynergic segments, 30(83%, positive predictive accuracy) had recorved contractility. In 25(76%, negative predictive accuracy) of 33 dobutamine non-responsive segments had not recovered contractility. Reversible ischemia on myocardial SPECT showed less sensitive(67%) and specific(56%) for detection of potentially recoverable myocardium than DSE. And positive(68%) and negative predictive accuracy(56%) also showed significantly lower than DSE. CONCLUSION: DSE can identify dyssynergic but recoverable myocardial segement for risk stratification before intervention in acute MI. Dobutamine responsiveness of dyssynergic segment is superior to reversible ischemia on myocardial SPECT for prediction of wall motion improvement after MI irrespective of intervention or medical therapy.