Gadolinium-enhanced Three-dimensional Magnetic Resonance Angiography in the Evaluation of Potential Renal Donors for Laparoscopic Donor Nephrectomy: Is it Alternative or Supplementary Tools to Intraarterial Digital Subtraction Angiography? / 대한신장학회잡지

BACKGOUND: The assessment of renal vasculature should be performed by an appropriate imaging technique before kidney transplantation. The current standard technique is intra-arterial digital subtraction angiography. Digital subtraction renal angiography (DSA) is associated with multiple problems. Three dimensional (3D) gadolinium enhanced magnetic resonance angiography (Gd-enhanced MRA) has been suggested as a potential technique due to its noninvasive nature. The aim of this study was to evaluate the accuracy of Gd-enhanced MRA of potential live donors before renal transplantation. METHODS: From September 2002 to September 2004, forty potential live kidney donors were evaluated using Gd-enhanced MRA and intraarterial DSA. Concordance rate and kappa were calculated in 38 transplantations except 2 patients who could not be operated after preoperative evaluation. Gd-enhanced MRA findings were compared with conventional DSA and surgical findings as the reference method respectively. RESULTS: In five donors, the findings at surgery were discrepant with Gd-enhanced MRA findings (concordance rate=86.8%) and conventional DSA findings (concordance rate=86.8%). Two accessory arteries initially were missed by Gd-enhanced MRA. They were depicted retrospectively by discussion with a radiologist, which was radiologic reporting error. There were no adverse events during the Gd-enhanced MRA procedure. None of the findings missed by Gd-enhanced MRA resulted in deleterious consequences at laparoscopic nephrectomy for the donor and graft. CONCLUSION: We demonstrated that Gd-enhanced MRA is an accurate, minimally invasive technique for assessing the live donors before renal transplantation. Clinical feedback and optimization of imaging techniques should be continued to improve accuracy rate in preoperative assessment of potential live donors who are candidates for laparoscopic nephrectomy.

Clinical factors affecting long-term patency after percutaneous transluminal angioplasty of insufficient hemodialytic arteriovenous fistula / 대한내과학회지

BACKGROUND: The aim of this study is to evaluate success rate and patency rate after percutaneous transluminal angioplasty (PTA) and to determine the factors affecting patency rate afterPTA in the management of insufficient arteriovenous fistula of hemodialysis patients. METHODS: Ninety-two cases of insufficient arteriovenous fistulae in 73 hemodialysis patients underwent angiography of the fistula and were treatedby PTA (native AVF: 67 cases, AV graft: 10 cases, central vein: 15 cases). The initial success rate and complications of PTA were evaluated. All patients were divided into two groups according to the age, sex, the duration of hemodialysis, a history of diabetes mellitus, the numbers of AVF operation, and the presence or absenceof thrombus. The patency rate was compared with the Kaplan-Meier method with log-rank test. To determine the clinical factors that affect vascular access failure rate, Cox regression method was used. RESULTS: The initial success rate of PTA was 78.2% (72/92). The patency rate after successful PTA was 80.0% at 6 months, and 73.2% at 12 months. The patency rate after successful PTA was significantly lower in cases which had two or more AVF operation (62.3% and 48.5% at 6 and 12 months) than just one (87.8% and 80.5% at 6 and 12 months). The most common PTA related complications were vessel spasm (3.9%) and hematoma (3.9%). CONCLUSIONS: The numbers of AVF operation was the only risk factor which affected the patency rate.

Crystal-induced Acute Renal Failure due to Acyclovir in a Renal Transplant Patient / 대한이식학회지

Several medications are associated with the production of crystals that are insoluble in human urine. Intratubular precipitations of these crystals can lead to acute renal insufficiency. Many patients who require treatment with these medications have additional risk factors, such as volume depletion, underlying renal insufficiency and immunocompromised state that increase the risk of drug induced intrarenal crystal deposition. We experienced a case of crystal-induced acute renal failure due to acyclovir in a 44 year-old male renal allograft recipient. He was diagnosed as Varicella Zoster at 12 days after transplantation, and treated with intravenous (IV) acyclovir (IV infusion of acyclovir 250 mg mixed with normal saline 100 mL within several minutes three times a day, total seven times). Two days after initiation of IV acyclovir, serum BUN was increased up to 160 mg/dL, serum creatinine was increased up to 9.9 mg/dL and urine output was decreased to anuria. With discontinuation of acyclovir, hemodialysis was started as treatment of renal insufficiency. Renal function was restored after discontinuation of acyclovir.

A Case of Cytomegalovirus (CMV) Panniculitis after Renal Transplantation / 대한이식학회지

Cytomegalovirus (CMV) remains an important pathogen in organ transplant patients. However, cutaneous lesions are rare manifestation of systemic CMV infection. We report a case of CMV panniculitis in a 47-year-old renal transplant recipient. She admitted due to fever, local pain in the left pelvic area, and erythematous tender palpable mass for 2 weeks. Twenty years ago, she underwent renal transplantation and had taken azathioprin 100 mg and prednisone 10 mg daily. Serum creatinine had been preserved between 2.5 and 3.5 mg/dL. Bacterial, fungal, and AFB cultures of skin lesion and drained pus were negative. CMV antigenemia was noted. Skin biopsy revealed multinucleated dermal histiocytes and positive for CMV antibody by immunohistochemical staining. Polymerase chain reaction testing of skin tissue and drained pus revealed CMV DNA. She was treated with ganciclovir for four weeks and skin lesion was completely resolved without recurrence.

The Early Result of Primary NIR Stenting in Acute Myocardial Infarction

BACKGROUND AND OBJECTIVES: The intracoronary stent may be useful in the preventing of abrupt closure and coronary restenosis after coronary angioplasty, and recently primary stenting has been one of therapeutic modalities. We assessed the clinical and angiographic results of primary NIR stenting in patients with acute myocardial infarction (AMI). MATERIALS AND METHODS: Between November 1997 to January 1999, 55 stentings with NIR stents were done in 51 patients with acute myocardial infarction. Angiographic follow-up was available at 7+/-2.3 days in 35 patients. RESULTS: 1) Among 51 patients (M/F: 37/14), 44 patients had Q-wave MI (86%), 7 patients had non-Q-wave MI (14%). 2) The mean age was 61+/-12.4 years (range: 26 to 82 years). 3) The mean time from the onset of chest pain to the arrival at emergency room was 4.6 +/- 4.2 hours. The mean door-to-balloon time was 93+/-46 minutes 4) Treated vessels were as follows: 28 in LAD, 17 in RCA, 10 in LCX. 5) The indications for stent implantation were suboptimal angiographic results after PTCA in 38 lesions (69%), dissection in 9 lesions (16%), abrupt vessel closure in 1 lesion and elective in 7 lesions (13%). 6) Single stent implantation was done in 47 patients. Overlapping stents were done in 4 patients. 7) A procedure related complication occurred in one patient, peri-stent dissection without flow limitation. 8) Full expansion of the stent failed in three lesions with coronary calcifications and the residual stenosis was 35, 40, 50% in each case. In these cases, in-stent thrombus was not demonstrated in follow up angiography. 9) The minimal lumen diameter increased from 0.11+/-0.39 to 2.96+/-0.40 mm. 10) Angiographic follow-up on 38 stents in 35 patients demonstrated in-stent thrombus in 3 stents, in-stent restenosis in 1 stent. But in-stent flow limitations were not found in these 4 cases and TIMI III flow were maintained. Patients with Q-wave MI and coronary thrombus on initial angiography were more prone to subacute thrombosis. CONCLUSION: The NIR stent could be used successfully in primary coronary stenting in acute myocardial infarction. The present study shows relatively low risk of subacute stent thrombosis. The rate of restenosis needs to be confirmed by long term study.

Immediate Coronary Angiographic Findings in Patients with Acute Myocardial Infarction

BACKGROUND AND OBJECTIVES: Most reports about coronary angiographic findings in acute myocardial infarction were done after thrombolytic therapy or several days after onset of symptom. The aim of this study is to evaluate coronary angiographic findings in patients with AMI within 24 hours after onset of symptoms and without thrombolytic therapy. Also we evaluated the correlation between the risk factors and severity of coronary artery disease. MATERIALS AND METHODS: We studied 70 patients with acute myocardial infarction admitted to Kyungpook National University Hospital (KNUH) from November 1997 to January 1999, and evaluated the clincial and coronary angiographic findings. We analyzed risk factors of coronary artery disease: age, total cholesterol, tiglyceride, high density lipoprotein (HDL)-cholesterol, low density lipoprotein (LDL)-cholesterol, hypertension, smoking, diabetes and family history of CAD. Coronary angiography was done immediately after the arrival at emergency room (door-to- angiography time). Exclusion criteria were delayed arrival (more than 24 hours after symptom onset), previous history of anticoagulation or medication of antiplatelet agents. RESULTS: 1) Among 70 patients (M/F: 53/17), 59 patients had Q wave myocardial infarction (QMI) (84%), 11 patients had non-Q wave-MI (NQMI) (16%). 2) The mean age was 61+/-12.2 years (range: 26 to 82 years). 3) The mean time from the onset of chest pain to angiography was 6.2+/-4.7 hours. 4) Twenty eight patients (40%) had one-vessel disease, 25 (36%) had two-vessel disease and 17 (24%) had three-vessel disease. 5) The location of infarct related arteries were as follows: LAD in 33 (47%), LCX in 13 (19%) and RCA in 24 (34%). 6) The mean diameter stenosis of infarct related artery (IRA) was 95+/-10.9%. According to the American College of Cardiology/American Heart Association (ACC/AHA) classification of IRA, type B lesion occurred most commonly in 56 patients (80%). 7) Thrombus was observed in 44 patients (63%) with QMI versus 3 patients (27%) with NQMI (p=0.006). 8) Calcifications of the wall of coronary arteries were observed in 28 patients (40%) and correlated with ages of patients. 9) History of cigarette smoking was present in 73%, hypertension in 31% and hypercholesterolemia in 15% of patients. The mean number of risk factor for each patient was 1.3. 10) Multivessel disease was significantly more frequent in patients who had two more risk factors. 11) The frequency of cigarette smoking was greater and the level of plasma triglyceride were higher in patients under 50 years of age. 12) One patient died during coronary angiography and another 2 patients died at 5 and 8 days after coronary angiography due to cardigenic shock. CONCLUSION: In immediate coronary angiographic findings in patients with AMI, multivessel disease and thrombus, and severe stenosis of IRA were observed more frequently than other studies after thrombolytic therapy or after several days of delay. Multivessel disease was significantly more frequent in the patients who had two or more risk factors of atherosclerosis.

Short-term prognostic value of CRP in the patients with acute coronary syndrome

BACKGROUND AND OBJECTIVES: Acute coronary syndrome occurs most commonly in the setting of atherosclerotic coronary artery disease, but there is little information concerning the mechanism responsible for the transition from stable to unstable coronary atherosclerotic plaque. Hypothetically, several microorganism(Chlamydia pneumonia, Cytomegalovirus and Helicobacter pylori) and their inflammatory reaction have been suggested as a causative motive in progression of acute coronary syndrome. Although it is unclear whether the serum level of CRP as a inflammatory parameter is concerned with previous inflammatory change or myocardial necrosis, CRP apper to be predictive of higher risk for cardiac event in the patients with acute coronary syndrome. Our objective was to evaluate whether the inflammatory parameters(CRP, ESR and WBC count) is useful in predicting the short-term cardiac risk within 30 days. MATERIALS AND METHOD: One hundred and ten patients with acute coronary syndrome were enrolled from April 1998 through August 1998. Blood samples were collected at 1st hour, 24th hour, 48th hour and 7th day and tested for CRP, ESR, WBC count and CK-MB level. Values of 323 normal were used as control. All patients were followed up for 30 days and assessed for the presence of cardiac complications. RESULTS: Peak CRP value of the patients with acute myocardial infarction(3.4+/-3.85 mg/dL, n=2) was higher than that of the patients with unstable angina(0.7+/-0.93 mg/dL, n=8, p2 mg/dL, n=0), the cardiac complication rate was higher than the low-CRP group(< or =2 mg/dL, n=0) (43.3% vs 2.5%, p<0.05). Peak CRP value was correlated with age(r=.191, p=.045), pulse rate(r=.186, p=.008), left ventricular ejection fraction(r=0.384, p<0.001), peak ESR(r=.383, p<0.001) and peak WBC count(r=.307, p=.001), but not with peak CK-MB level. CONCLUSION: Elevated CRP level in patients with acute coronary syndrome seems to be a valuable prognostic factor for the development of cardiac complications within 1 month after admission.

Clinical Characterization of Reverse Redistribution Pattern in 99mTC-Sestamibi Myocardial Perfusion Scan

BACKGROUND AND OBJECTIVES: Reverse redistribution pattern (RRP), that is defined as the worsening of the perfusion defect at rest image, can be observed in 99mTC-sestamibi (methoxy isobutyl isonitrile) myocardial scan with standard stress-rest protocol. This study was prepared to evaluate the prevalence and clinical characteristics of RRP in stress 99mTc-sestamibi myocardial scan. MATERIALS AND METHODS: We retrospectively reviewed 1304 images of 99mTC-sestamibi myocardial perfusion scan performed between January 1995 and June 1997, and scintigraphic findings were compared with clinical and angiographic data. RESULTS: The prevalence of RRP was 5.2%(68 of 1,304). RRP was noted in 6.0% (41 of 679) of the adenosine study and 4.3% (27 of 625) of the exercise study. The mean coronary artery stenosis at RRP territory was 51.5+/-38.9%. However, normal coronary artery at RRP territory was noted in 45.8% (11 of 24). There was no significant differences in luminal narrowing of coronary arteries, TIMI flow grade and LV wall motion between the patient with RRP positive and RRP negative at the infarct related artery territory. CONCLUSION: Reverse redistribution pattern on 99mTC-sestamibi myocardial SPECT does not seem to indicate the presence of significant coronary artery disease or patency of the infarct related arteries in the patients with acute MI.