101
|
Lai CL, Tai CT, Liu CK, Lin RT, Howng SL. A longitudinal study of central and peripheral nerve conduction in hypothyroid rats. J Neurol Sci 1997; 148:139-45. [PMID: 9129109 DOI: 10.1016/s0022-510x(96)05348-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
In order to detect the dysfunction of central and peripheral nervous systems among rats with varied duration of hypothyroidism and to elucidate the pattern of recovery after thyroxine replacement, a series of BAEP and PNCS (Peripheral Nerve Conduction Study) were conducted and compared with age-matched controls. BAEP and PNCS were performed in three groups of hypothyroid animals 1, 3 and 5 months after thyroidectomy, respectively. Following initial electrophysiological assessment, thyroxine replacement was administered to each group of hypothyroid rats, and BAEP and PNCS were performed at two month intervals, up to two successive normal studies, or six months after the initiation of therapy, whichever came first. For BAEP, prolonged I-V interpeak latency was the most consistent abnormal finding in all groups of hypothyroid rats, and longer hypothyroid states correlated well with more severe central conduction disorder. Nevertheless, these abnormalities usually returned to normal after thyroxine replacement if the duration of hypothyroidism was less than 5 months. Regarding PNCS, all groups of thyroidectomized rats showed normal conduction before and after thyroxine therapy. The present study indicates that, in rats: (1) the peripheral nervous system seems to be more resistant to hypothyroidism than the central nervous system, or (2) the pathogenesis of central and peripheral nerve dysfunction in hypothyroid rats may occur through different mechanisms.
Collapse
|
102
|
Dorjee S, Lai CL, Lee A, Lee CY. Monoclonal antibodies as direct probes for human sperm acrosome reaction. Am J Reprod Immunol 1997; 37:283-90. [PMID: 9161634 DOI: 10.1111/j.1600-0897.1997.tb00231.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
PROBLEM To develop simple and rapid assay procedures for determining human sperm acrosome reaction under various experimental conditions. METHODS Specific monoclonal antibodies against human sperm acrosome were generated and utilized as probes for acrosome reaction assays by direct labelling of antibodies with fluorescein-isothiocyanate (FITC). RESULTS Among the generated monoclonal antibodies, HS-63 was shown to react with antigens in the acrosome content of permeabilized acrosome-intact human sperm, but not with those of the live ones. HSA-10 was found to recognize antigens on the surface of sperm inner acrosome and to react with acrosome-reacted human sperm in suspension. Following a swim-up procedure, highly motile sperm were recovered and incubated in BWW medium at 37 degrees C for 18 h. The percentages of acrosome-reacted sperm were determined at various incubation times by using FITC-labeled HS-63 or HSA-10 as the indicators in 10 min direct immunofluorescent assay. With the FITC-labeled HS-63 probe, the percentage of positively stained human sperm fixed in methanol decreased significantly after 18 h of incubation from > 90 to 70-80%. In contrast, positively stained live human sperm by HSA-10 increased significantly from < 1% to 15-30%. A high correlation was obtained between the use of monoclonal antibodies and PSA (Pissum sativum agglutinin) for direct assessment of human sperm acrosome reaction. CONCLUSION In view of the simplicity in assay procedures and evaluations, these FITC-labeled monoclonal antibodies are reliable probes for direct assessment of acrosomal status of human sperm.
Collapse
|
103
|
Lai CL, Lau YN, Wu PC. An update on hepatocarcinogenesis. Hong Kong Med J 1997; 3:69-78. [PMID: 11847358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023] Open
Abstract
Hepatocellular carcinoma is the most common cancer occurring in males in the world and has an annual incidence worldwide of 1 million. There are variations in its geographical distribution. It is the second most common cancer in Southeast Asia, including Hong Kong and ranks third among males in China.
Collapse
|
104
|
Yin SJ, Liao CS, Wu CW, Li TT, Chen LL, Lai CL, Tsao TY. Human stomach alcohol and aldehyde dehydrogenases: comparison of expression pattern and activities in alimentary tract. Gastroenterology 1997; 112:766-75. [PMID: 9041238 DOI: 10.1053/gast.1997.v112.pm9041238] [Citation(s) in RCA: 76] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
BACKGROUND & AIMS Alcohol dehydrogenase (ADH) and aldehyde dehydrogenase (ALDH) are the major enzymes responsible for ethanol metabolism in humans. The human stomach has been documented to be involved in the metabolism of first-passed alcohol. The aim of this study was to determine ethanol-metabolizing activities in the stomach with regard to sex, age, enzyme pattern, and polymorphism. METHODS A total of 209 surgical gastric mucosal specimens were investigated. The expression patterns of ADH and ALDH were identified by isoelectric focusing, and the activities were assayed spectrophotometrically. RESULTS At 33 or 500 mmol/L ethanol, pH 7.5, the activities in the ADH3 1-1 phenotypic and mu-ADH-expressing mucosal specimens were significantly greater than that in the ADH3 1-2 phenotypic and mu-ADH absent mucosal specimens, respectively. The activities of the ALDH2-inactive phenotypes were significantly lower than that of the ALDH2-active phenotypes at 200 micromol/L acetaldehyde. The gastric ADH and ALDH activities were not significantly different between men and women with respect to age and genetic polymorphism. CONCLUSIONS The stomach may contribute only a small portion of the alcohol metabolism observed in humans, and the liver may be the major site for first-pass metabolism. Differential expression patterns of ADH and ALDH in the alimentary tract suggest that different vulnerabilities to ethanol-induced mucosal injury may exist.
Collapse
|
105
|
Prescott LE, Simmonds P, Lai CL, Chan NK, Pike I, Yap PL, Lin CK. Detection and clinical features of hepatitis C virus type 6 infections in blood donors from Hong Kong. J Med Virol 1997. [PMID: 8915883 DOI: 10.1002/(sici)1096-9071(199610)50: 2<168: : aid-jmv10>3.0.co; 2-i] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The genotype distribution of hepatitis C virus (HCV) was investigated in 212 viraemic blood donors from Hong Kong. A subset of the samples was investigated using three different genotyping assays to establish the accuracy of each in this population. These assays were restriction fragment length polymorphism (RFLP) of amplified 5' noncoding region (5'NCR) sequences, RFLP of the core region, and a serotyping assay using peptides from two antigenic regions of NS4. Genotypes detected in Hong Kong blood donors were 1a (6.2%), 1b (58.8%), 2a (1.4%), 2b (1.4%), 3a (1.9%), and 6a (27.0%). All genotyping assays produced concordant results. No evidence was obtained for the presence of type 6 group variants recently identified in Southeast Asia, other than type 6a. A serotyping assay based upon the detection of type-specific antibody to epitopes in NS4 produced similar results to the genotyping assays (98% concordance), but a reduced sensitivity (75%) compared with genotyping methods. Sequence variation in NS4 was not the cause of the reduced rate of detection of type 6 antibody in this population. Eighty-four percent donors infected with type 6a were male, compared to 75% donors infected with type 1b. The median alanine transaminase (ALT) level in type 6 infected donors was lower than in type 1b, (43.8 and 51.1 U/l, respectively) although these values were not statistically significant (P = 0.094). There was no significant difference between the ages of donors infected with types 1b and 6a. Risk factors for HCV infection in the blood donors included blood transfusion, intravenous drug abuse, and tattooing. A significantly greater number of donors infected with HCV-6a reported a history of drug abuse (66%) than donors infected with HCV-1b (7%).
Collapse
|
106
|
Lai CL, Ching CK, Tung AK, Li E, Young J, Hill A, Wong BC, Dent J, Wu PC. Lamivudine is effective in suppressing hepatitis B virus DNA in Chinese hepatitis B surface antigen carriers: a placebo-controlled trial. Hepatology 1997; 25:241-4. [PMID: 8985298 DOI: 10.1002/hep.510250144] [Citation(s) in RCA: 180] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Lamivudine is a novel 2',3'-dideoxy cytosine analogue that has potent inhibitory effects on hepatitis B virus replication in vitro and in vivo. We performed a single-blind, placebo-controlled study to assess its effectiveness and safety in Chinese hepatitis B surface antigen (HBsAg) carriers. Forty-two Chinese HBsAg carriers were randomized to receive placebo (6 patients) or lamivudine orally in dosages of 25 mg, 100 mg, or 300 mg daily (12 patients for each dosage). The drug was given for 4 weeks. The patients were closely monitored clinically, biochemically, and serologically up to 4 weeks after drug treatment. All 36 patients receiving lamivudine had a decrease in hepatitis B virus (HBV) DNA values of >90% (P < .001 compared with placebo). Although 25 mg of lamivudine was slightly less effective than 100 mg (P = .011) and 300 mg (P = .005), it still induced 94% suppression of HBV DNA after the fourth week of therapy. HBV DNA values returned to pretreatment levels within 4 weeks of cessation of therapy. There was no change in the hepatitis B e antigen status or in aminotransferase levels. No serious adverse events were observed. In conclusion, a 4-week course of lamivudine was safe and effective in suppression of HBV DNA in Chinese HBsAg carriers. The suppression was >90% but reversible. Studies with long-term lamivudine administration should be performed to determine if prolonged suppression of HBV DNA can be achieved.
Collapse
|
107
|
Wu PC, Fang JW, Lau VK, Lai CL, Lo CK, Lau JY. Classification of hepatocellular carcinoma according to hepatocellular and biliary differentiation markers. Clinical and biological implications. THE AMERICAN JOURNAL OF PATHOLOGY 1996; 149:1167-75. [PMID: 8863666 PMCID: PMC1865193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Hepatocellular carcinoma (HCC) is a heterogeneous disease. HCC derived from different stages of cellular differentiation may have different clinical and pathobiological behavior. To test the hypothesis that HCC can be classified into two types based on its phenotypic markers (hepatocellular and biliary differentiation), liver tissues from 290 Chinese patients with HCC were studied. Expression of hepatocytic differentiation marker (HEP-PAR-reactive antigen), biliary differentiation markers (AE1-AE3, cytokeratin-19), proliferation markers (Ki-67, proliferating cell nuclear antigen), alpha-fetoprotein, p53, and transforming growth factor-alpha in the tumor tissue were assessed by immunohistochemistry. Hepatocytic differentiation marker was detected in 99.7% and biliary differentiation markers were detected in 29.3% of these tumors. Clinically, no patient with HCC with biliary markers survived for more than 27 weeks compared with a 22.6% survival rate in patients with HCC negative for biliary markers. HCCs positive for the biliary differentiation markers showed features of more aggressive disease in terms of poorer cellular differentiation (P < 0.001) and high-level expression of proliferation markers (Ki-67, P < 0.001; proliferating cell nuclear antigen, P = 0.0114) compared with HCCs without biliary markers. HCCs with biliary markers also had a higher level of expression of alpha-fetoprotein (P < 0.001) and p53 (P = 0.0077). Classification of HCCs based on its phenotypic (differentiation) markers has both clinical and pathobiological implications.
Collapse
|
108
|
Prescott LE, Simmonds P, Lai CL, Chan NK, Pike I, Yap PL, Lin CK. Detection and clinical features of hepatitis C virus type 6 infections in blood donors from Hong Kong. J Med Virol 1996; 50:168-75. [PMID: 8915883 DOI: 10.1002/(sici)1096-9071(199610)50:2<168::aid-jmv10>3.0.co;2-i] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The genotype distribution of hepatitis C virus (HCV) was investigated in 212 viraemic blood donors from Hong Kong. A subset of the samples was investigated using three different genotyping assays to establish the accuracy of each in this population. These assays were restriction fragment length polymorphism (RFLP) of amplified 5' noncoding region (5'NCR) sequences, RFLP of the core region, and a serotyping assay using peptides from two antigenic regions of NS4. Genotypes detected in Hong Kong blood donors were 1a (6.2%), 1b (58.8%), 2a (1.4%), 2b (1.4%), 3a (1.9%), and 6a (27.0%). All genotyping assays produced concordant results. No evidence was obtained for the presence of type 6 group variants recently identified in Southeast Asia, other than type 6a. A serotyping assay based upon the detection of type-specific antibody to epitopes in NS4 produced similar results to the genotyping assays (98% concordance), but a reduced sensitivity (75%) compared with genotyping methods. Sequence variation in NS4 was not the cause of the reduced rate of detection of type 6 antibody in this population. Eighty-four percent donors infected with type 6a were male, compared to 75% donors infected with type 1b. The median alanine transaminase (ALT) level in type 6 infected donors was lower than in type 1b, (43.8 and 51.1 U/l, respectively) although these values were not statistically significant (P = 0.094). There was no significant difference between the ages of donors infected with types 1b and 6a. Risk factors for HCV infection in the blood donors included blood transfusion, intravenous drug abuse, and tattooing. A significantly greater number of donors infected with HCV-6a reported a history of drug abuse (66%) than donors infected with HCV-1b (7%).
Collapse
|
109
|
Lo CM, Fan ST, Chan JK, Wei W, Lo RJ, Lai CL. Minimum graft volume for successful adult-to-adult living donor liver transplantation for fulminant hepatic failure. Transplantation 1996; 62:696-8. [PMID: 8830841 DOI: 10.1097/00007890-199609150-00029] [Citation(s) in RCA: 129] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The major limitation of adult-to-adult living donor liver transplantation is the adequacy of the size of the graft that can be safely harvested from the donor. The present report describes a 22-year-old woman with stage 4 hepatic coma due to fulminant hepatic failure who was successfully treated using a small-for-size left lobe graft from her father. The graft weight was 0.6% of the recipient's body weight, or 25% of her ideal liver weight. Avoidance of warm ischemia, short cold ischemic time, and early treatment of rejection are important elements in optimizing small-for-size graft function. Since the left lobe represents 23-36% of the total liver volume of an adult, it is possible, in most cases, to harvest a left lobe graft of adequate size from a donor of similar size as the recipient.
Collapse
|
110
|
Lo CM, Chan KL, Fan ST, Saing H, Lo RJ, Tsoi NS, Wei W, Lai CL. Living donor liver transplantation: the Hong Kong experience. Transplant Proc 1996; 28:2390-2. [PMID: 8769263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
|
111
|
Fan ST, Lo CM, Chan KL, Lo R, Saing H, Wei W, Lai CL, Tsoi NS, Ng I, Chan JK, Chau MT, Tso WK, Wong J. Liver transplantation--perspective from Hong Kong. HEPATO-GASTROENTEROLOGY 1996; 43:893-7. [PMID: 8884310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
BACKGROUND/AIMS We report our experience of 27 orthotopic liver transplantations in 26 patients performed at Queen Mary Hospital, Hong Kong during the period of October 1991 to October 1995. PATIENTS AND METHODS There were 19 adults and 7 pediatric patients with a mean age of 29 years (range 8 months to 62 years). The underlying liver diseases of the 26 patients were biliary atresia (n = 6), Alagille syndrome (n = 1), primary biliary cirrhosis (n = 2) cryptogenic cirrhosis (n = 2), alcoholic cirrhosis (n = 5), Wilson's disease (n = 1), fulminant hepatic failure (n = 3), polycystic liver (n = 2), secondary biliary cirrhosis (n = 1), HBV cirrhosis (n = 2) and autoimmune hepatitis with hepatocellular carcinoma (n = 1). The pathology leading to re-transplantation in a pediatric patient was post-transplant hepatitis of unknown etiology. The liver grafts were obtained from 19 brainstem dead and 8 living donors. The pediatric patient requiring re-transplantation received a left lateral segment graft from her mother. Two adults received left lobe grafts from their family members. RESULTS The overall graft survival is 88% and patient survival is 92%. There were only 2 deaths: one patient developed primary graft nonfunction and died from intracerebral bleeding 39 days after transplantation and the other died from graft rejection resistant to salvage by steroid pulse and OKT3. The other patients are well with functioning grafts. CONCLUSIONS We hope that the current success rate can convince people in our locality in cadaveric organ donation so that living donors do not run the risk of dying from the operation, although the risk is estimated to be very small.
Collapse
|
112
|
Lo CM, Lo RJ, Lai CL, Fan ST, Wong J. Liver transplantation from cadaveric and living donors. Transplant Proc 1996; 28:1659-60. [PMID: 8658826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
|
113
|
Cheng IK, Ho SK, Fang GX, Chan DT, Lai CL. Usefulness of measurement of serum viral DNA using dot-blot hybridization and polymerase chain reaction in renal transplant patients with hepatitis B-positive viral infection. Transplant Proc 1996; 28:1493-4. [PMID: 8658756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
|
114
|
Ching CK, Leung KP, Yung RW, Lam SK, Wong BC, Lai KC, Lai CL. Prevalence of metronidazole resistant Helicobacter pylori strains among Chinese peptic ulcer disease patients and normal controls in Hong Kong. Gut 1996; 38:675-8. [PMID: 8707111 PMCID: PMC1383147 DOI: 10.1136/gut.38.5.675] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
BACKGROUND A study was conducted to evaluate the prevalence of metronidazole resistant Helicobacter pylori strains among the Chinese in Hong Kong. The efficacy of the triple therapy that contains metronidazole as one of the anti-microbial agents in eradication of the metronidazole susceptible and the metronidazole resistant strains was also assessed. METHODS Culture for H pylori was attempted from antral biopsy specimens of 70 peptic ulcer and 51 control subjects. Successfully cultured H pylori strains were tested for metronidazole susceptibility. Twenty six peptic ulcer disease subjects who had received a course of triple therapy were also reassessed four to six weeks later for successful eradication of H pylori infection. RESULTS AND CONCLUSIONS H pylori was successfully cultured from antral biopsy specimens in 69 of 80 (86%) of the infected subjects. The overall metronidazole resistance rate was 53.5% (37 of 69). There was a significantly higher metronidazole resistance rate among H pylori isolates from the asymptomatic controls (20 of 25) than the peptic ulcer disease subjects (17 of 44) (p = 0.0007). Twenty three of 32 (73%) women and 14 of 37 (38%) men harboured the metronidazole resistant strains. There was no sex or age difference as far as the prevalence of metronidazole resistant strains were concerned within each study group. Pre-treatment metronidazole susceptible H pylori were significantly more likely to respond to the triple therapy used than those with the metronidazole resistant ones (14 of 15 v five of 10) (p = 0.021).
Collapse
|
115
|
Ko YY, Chen CH, Lai CL, Perng RP. Recurrent infection of Legionella pneumonia: a case report. ZHONGHUA YI XUE ZA ZHI = CHINESE MEDICAL JOURNAL; FREE CHINA ED 1996; 57:365-9. [PMID: 8768386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A 75-year-old male veteran presented with bilateral pneumonia upon admission. He had an episode of Legionnaires' disease in 1991 with complete treatment of erythromycin 500 mg orally every six hours for three weeks. After admission, recurrence of Legionnaires' disease was suspected due to increased serum Legionella antibody (1:128) and strong positive sputum Legionella antigen. Erythromycin and other parental antibiotics were administered, but respiratory failure developed promptly, followed by multiple organ failure syndrome that involved the liver, lung, bone marrow and kidney. He died 42 days after admission. We reviewed seven cases that had been reported and found recurrence of Legionella pneumonia possible after a successful treatment, especially for immunocompromised hosts. Early empirical therapy with erythromycin is recommended.
Collapse
|
116
|
Ngan H, Lai CL, Fan ST, Lai EC, Yuen WK, Tso WK. Transcatheter arterial chemoembolization in inoperable hepatocellular carcinoma: four-year follow-up. J Vasc Interv Radiol 1996; 7:419-25. [PMID: 8761824 DOI: 10.1016/s1051-0443(96)72881-6] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
PURPOSE To evaluate the efficacy of repeated chemoembolization in patients with inoperable hepatocellular carcinoma (HCC). PATIENTS AND METHODS One hundred thirty-two patients with HCC underwent transcatheter arterial chemoembolization with an emulsion of iodized oil and cisplatin. In 104 patients, "light" gelatin sponge embolization was also used. Chemoembolization was repeated every 1.5-3.0 months in most patients (range, one to 18 chemoembolization sessions). RESULTS In 74 patients, the HCCs became smaller or disappeared after chemoembolization. Decreases in size were seen in 55 of 76 HCCs 9 cm or smaller, 17 of 42 HCCs between 9 and 18 cm, and two of 14 HCCs larger than 18 cm. Use of gelatin sponge pledgets enhanced the response in tumors larger than 9 cm. Seven of 74 HCCs that responded to chemoembolization increased in size later. New daughter nodules that appeared at other sites responded to chemoembolization in 24 of 40 patients. Further new nodules appeared in 14 of 24 patients, and in six patients they responded to therapy. Median survival was 26 months for patients with responsive HCCs and 5 months for those with unresponsive lesions. CONCLUSION Tumor size at the start of chemoembolization influenced the response to treatment and survival. The addition of gelatin sponge improved results only in tumors larger than 9 cm. Recurrence after an initial response was due more to the appearance of new daughter nodules in new locations rather than recrudescence of the presenting tumor.
Collapse
|
117
|
Tse HF, Lau CP, Lau YK, Lai CL. Transesophageal echocardiography in the detection of inferior vena cava and cardiac metastasis in hepatocellular carcinoma. Clin Cardiol 1996; 19:211-3. [PMID: 8674258 DOI: 10.1002/clc.4960190314] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Antemortem diagnosis of inferior vena cava (IVC) and cardiac metastasis of hepatocellular carcinoma (HCC) is difficult but important before consideration of curative resection. There are only a few cases of cardiac metastasis of HCC which have been diagnosed antemortem by echocardiography. Accordingly, 18 consecutive patients with HCC who were potential candidates for curative resection were studied by transthoracic (TTE) and transesophageal echocardiography (TEE). One (6%) and two (11%) patients had cardiac and IVC metastasis of HCC, respectively, which was detected by two-dimensional TTE. In contrast, by using TEE, four patients (22%) showed tumor invasion of the IVC, of whom two (11%) had tumor mass extending into the right atrium (RA). There was no significant difference in age, serum level of alpha-fetoprotein, and percentage of right liver lobar involvement between those with and without cardiac metastasis. Patients without cardiac metastasis detected on TTE or TEE had significantly longer mean duration of survival (5.0 +/- 2.1 vs. 2.1 +/- 1.0 months; p < 0.05). In summary, TEE may be more useful than TTE in the detection of cardiac metastasis of HCC, which occurred in 22% of patients whose primary tumor was considered to be surgically resectable in our series. This can be safely performed in patients with HCC and can provide optimal visualization of the IVC and RA. The high prevalence of subclinical cardiac metastasis in HCC mandates the use of TEE in all patients with HCC prior to surgical intervention.
Collapse
|
118
|
Lai CL, Chiu MH, Chen CH, Li WY, Perng RP. Malignant lymphoma presenting as tracheal tumor: a case report. ZHONGHUA YI XUE ZA ZHI = CHINESE MEDICAL JOURNAL; FREE CHINA ED 1996; 57:236-9. [PMID: 8935233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
A 66-year-old male presented with dyspnea and cough for 1 month. Fiberoptic bronchoscopy disclosed a huge tumor over the posterior wall of the trachea 1 cm below the vocal cord and biopsy pathology was diffuse, small cleaved lymphoma. Primary malignant lymphoma of the trachea is extremely rare. Its clinical course varies widely, and has no accepted standard of management. We describe herein the whole clinical course of this patient, which is not similar to previous reports. The relation of primary tracheal lymphoma to mucosa-associated lymphoid tissue (MALT) is also discussed.
Collapse
|
119
|
Wu PC, Fang JW, Lai CL, Lau SS, Lo CK, Lai A, Lau JY. Hepatic expression of hepatitis B virus genome in chronic hepatitis B virus infection. Am J Clin Pathol 1996; 105:87-95. [PMID: 8561093 DOI: 10.1093/ajcp/105.1.87] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
The expression of hepatitis B virus (HBV) DNA in the liver was studied by nonisotopic in situ hybridization and correlated with liver histology, different phases in the natural evolution of chronic hepatitis B, and hepatic expression of HBV antigens in 251 Chinese patients with chronic HBV infection. A good correlation was found between the detection of HBV-DNA by in situ hybridization and serum HBV-DNA (P < .01). Chronic active hepatitis had the highest HBV-DNA detected in cytoplasm and nuclei, compared with livers showing minimal change, chronic persistent hepatitis, cirrhosis, and hepatocellular carcinoma. HBV-DNA in cytoplasm exceeded HBV-DNA in nucleus in all patients except in livers with hepatocellular carcinoma. Hepatic HBV-DNA correlated with disease activity (P < .02) and the correlation was highly significant with intralobular activity (P < .001). Patients in the early viral replicative phase of infection had higher levels of cytoplasmic and nuclear HBV-DNA compared with the late viral nonreplicative phase. Cytoplasmic and nuclear HBV-DNA correlated with hepatic expression of HBcAg and HBsAg (P < .05 in both cases), but not with HBeAg. These data indicate that hepatic expression of HBV-DNA follows the natural history of chronic HBV infection and is associated with active liver disease.
Collapse
|
120
|
Chen CH, Lai CL, Chiu MH, Liu RD, Shih JF, Lee YC, Perng RP. [Diagnostic value of ultrasonically guided lung aspiration in pneumonia]. J Formos Med Assoc 1995; 94 Suppl 2:S137-43. [PMID: 8672942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
To determine the diagnostic value of ultrasonic lung aspiration for patients with pneumonia, 60 patients with a tentative diagnosis of pneumonia were included in this study. After recording ultrasonographic findings, lung aspiration was done with a spinal needle and aspirated specimens were sent for Papanicolaou, May-Giemsa, acid fast, and Gram stains. The remaining specimens were sent for bacterial, mycobacterial and fungal culture. Twelve patients were excluded from the study because of the final diagnosis of non-infectious pulmonary diseases. In 28 cases of bacterial pneumonia, the diagnostic sensitivity of smear was 50% and culture 61%. The overall sensitivity of needle aspiration and culture was 71%. In 11 cases of bacterial pneumonia with a negative bacterial culture result, 7 cases were afebrile at the time of examination. To increase the diagnostic yield, needle aspiration should be performed at the acute stage of bacterial pneumonia. In 15 cases of pulmonary tuberculosis, the diagnostic rate of acid-fast smear was 47% and mycobacterial culture was 46%. The overall sensitivity of smear and culture was 60%. The diagnostic rate of needle biopsy was 75% and cytologic examination was 77%. Needle biopsy and cytologic examination enhanced the diagnostic rate of sputum-negative pulmonary tuberculosis. Cryptococcosis was documented by smear and needle biopsy in all of the five cases of cryptococcosis. Cryptococcosis is not easily detected by routine cytologic examination, and clinical information is still necessary to enhance the diagnostic rate. Our results show that ultrasonically guided lung aspiration is a technique with a high diagnostic yield and a low complication rate for various types of pneumonia. It is especially useful for patients without satisfactory clinical responses or without accurate microbiologic diagnosis.
Collapse
|
121
|
Lai CL, Lin RT, Liu CK, Tai CT, Howng SL. [The changes of central and peripheral nerve conduction and the effect of thyroxine replacement in thyroidectomized rats]. GAOXIONG YI XUE KE XUE ZA ZHI = THE KAOHSIUNG JOURNAL OF MEDICAL SCIENCES 1995; 11:589-98. [PMID: 7494241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The aim of this study is to make serial BAEPs and PNCS in hypothyroid rats in order to provide objective and quantitative methods of detecting dysfunction of the central and peripheral nervous system in hypothyroid status and elucidating the relationship between the recovery potential and the duration of hypothyroid status. Thyroidectomy was performed in eighteen naive 5-month-old Sprague-Dawley rats in order to induce hypothyroid status, which was confirmed by RIA study 1-2 months after the surgery. Initial BAEP and PNCS were performed in two groups of the hypothyroid animals 1 and 3 months after thyroidectomy. Following the initial examination, thyroxin replacement therapy was given to each hypothyroid group, and then followed by BAEPs and PNCS at two month intervals, up to twice normal studies or six months after the initiation of therapy. In the BAEP study, the prolonged I-V inter-peak latency was the most consistent abnormal finding in all hypothyroid rats. Delayed peak latencies as well as prolonged I-III and III-V inter-peak intervals occurred when the hypothyroid status was longer than one month. We noted that the longer the hypothyroid status, the more severe the central conduction dysfunction. Nonetheless, these abnormalities always returned to normal after the replacement therapy if the hypothyroid state was shorter than 3 months in duration. For the PNCS study, all groups of thyroidectomized rats showed the normal results. We think the peripheral nervous system of rats may be more resistant to damage by hypothyroidism than the central nervous system.
Collapse
|
122
|
Chung HT, Lai CL, Lok AS. Pathogenic role of hepatitis B virus in hepatitis B surface antigen-negative decompensated cirrhosis. Hepatology 1995; 22:25-9. [PMID: 7601418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/06/2022]
Abstract
This study was conducted to determine the rate of detection of serum hepatitis B virus (HBV) DNA in hepatitis B surface antigen (HBsAg)-negative decompensated cirrhotic patients who had hepatitis B core and/or surface antibodies (anti-HBc and/or anti-HBs), and to compare the outcome of HBsAg-positive cirrhotic patients who did or did not clear HBsAg during follow-up. Six (5%) of 121 HBsAg-positive cirrhotic patients lost HBsAg after 0.2 to 17.1 years (mean, 9.1 +/- 6.2 yr) of follow-up. The cumulative rates of loss of HBsAg at 1, 5, 10, and 15 years were, respectively, 1.3%, 1.3%, 7.4%, and 44.5%. Compared with the patients who remained HBsAg-positive, those who lost HBsAg had milder disease at presentation and significantly longer survival. Of the patients who lost HBsAg, 83% had improvement in liver function after the loss of HBsAg, and all were alive at the time of writing (0.8 to 5.7 years after loss of HBsAg), whereas 27% of those who remained HBsAg-positive had died and 29% had deterioration in liver function. The rate of detection of serum HBV DNA by polymerase chain reaction (PCR) assay was higher in HBsAg-positive cirrhotic patients who lost HBsAg:67% versus cirrhotic patients who had no previous history of chronic HBV infection; 16% (cryptogenic) and 29% (hepatitis C virus and/or alcohol-induced liver disease). In summary, we found that using PCR, serum HBV DNA can be detected in 28% of HBsAg-negative cirrhotic patients who were studied, but the pathogenic significance of such small amounts of virus is not clear.(ABSTRACT TRUNCATED AT 250 WORDS)
Collapse
|
123
|
Chan TM, Wu PC, Lok AS, Lai CL, Cheng IK. Clinicopathological features of hepatitis C virus antibody negative fatal chronic hepatitis C after renal transplantation. Nephron Clin Pract 1995; 71:213-7. [PMID: 8569957 DOI: 10.1159/000188715] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Clinical course and serial liver histology of a patient who developed fatal chronic active hepatitis C after renal transplantation are presented. This patient developed persistently deranged liver biochemistry 3 months after transplantation, despite normal liver enzyme values during the preceding 3 years on hemodialysis. In addition to increased parenchymal enzyme concentrations, the levels of ductal enzymes were also markedly elevated, with peak levels of alanine aminotransferase and gamma-glutamyl transpeptidase 7 and 100 times, respectively, the normal upper limit. The patient was persistently seronegative for hepatitis C virus (HCV) antibodies, but positive for HCV RNA. Treatment with alpha-interferon for 6 months, initiated after the development of early cirrhosis, resulted in no improvement, and the patient died from liver failure 36 months after renal transplantation. Serial liver histology, examined four times from 11 months to 36 months after transplantation, showed progressive deterioration from chronic active hepatitis to cirrhosis. This patient illustrates the uncommon complication of rapidly progressive and ultimately fatal liver disease due to HCV infection after renal transplantation. Early recognition with anti-HCV and HCV RNA assays as well as histologic assessment are crucial for the identification of patients with a poor prognosis who might benefit from therapeutic intervention before irreversible liver damage.
Collapse
|
124
|
Chan TM, Wu PC, Lau JY, Lai CL, Lok AS, Cheng IK. Clinicopathologic features of hepatitis C virus infection in renal allograft recipients. Transplantation 1994; 58:996-1000. [PMID: 7974739 DOI: 10.1097/00007890-199411150-00004] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The clinicopathologic features, the natural history, and the prognostic indicators of hepatitis C virus (HCV)-related liver disease in renal allograft recipients have not been well defined. Among 220 renal allograft recipients, 21 were seropositive for HCV RNA, which persisted on prospective follow-up for 40 months. Elevations in alanine aminotransferase and alkaline phosphatase were noted after renal transplantation in 15 (71.4%) and 9 (42.9%) patients, respectively, with 11 (52.4%) showing recurrent or persistent abnormalities. Mortality from liver failure was noted in 1 patient. Persistence of abnormal liver biochemistry was associated with an early onset of biochemical derangement after transplantation, and a longer dialysis duration (P < 0.05). HCV-related liver pathology was assessed in 13 patients by histologic scoring with respect to "hepatitic activity," "bile duct damage," and "architectural abnormality," adding up to a "total" score. Six (46.2%) of 13 initial liver biopsies showed significant chronic liver disease. Liver histology correlated with mean alanine aminotransferase and alkaline phosphatase levels after renal transplantation, and was more severe in patients with persistent biochemical abnormalities. Early onset of abnormal liver biochemistry after transplantation and persistently abnormal biochemistry were independent predictors of worse total and activity scores (P < 0.05). Renal transplant recipients demonstrated lower activity scores when compared with nonimmunosuppressed subjects with chronic hepatitis C (P = 0.03). HCV RNA was detectable in all 23 liver specimens tested. We conclude that significant, potentially life-threatening liver pathology manifests in about half of renal transplant recipients with chronic HCV infection. Liver histology correlates with the longitudinal biochemical profile. Patients with early onset of biochemical abnormalities and persistently deranged liver biochemistry are at risk of developing severe liver disease.
Collapse
|
125
|
Fang JW, Wu PC, Lai CL, Lo CK, Meager A, Lau JY. Hepatic expression of interferon-alpha in chronic hepatitis B virus infection. Dig Dis Sci 1994; 39:2014-21. [PMID: 8082512 DOI: 10.1007/bf02088140] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Hepatic expression of interferon-alpha (IFN-alpha) was examined by immunohistochemistry in 90 Chinese patients (M/F 67:23, age: 14-69) with a spectrum of hepatitis B virus (HBV)-related chronic liver diseases. Immunoreactive IFN-alpha was detected in sinusoidal cells in 79 patients (88%) and in mononuclear cells in 59 patients (65.6%). Patients with active liver diseases (chronic active hepatitis, active cirrhosis, N = 55) had a higher level of IFN-alpha expression compared to patients with inactive histology (N = 35; sinusoidal cells, P < 0.01; mononuclear cells, P < 0.01). Cytoplasmic HBsAg, nuclear HBcAg, and cytoplasmic HBcAg were detected in 79 (88%), 42 (47%), and 23 (27%) patients respectively. Expression of IFN-alpha in mononuclear cells correlated with the expression of cytoplasmic HBcAg (P < 0.05) but not with nuclear HBcAg or cytoplasmic HBsAg. When the patients were divided into four different phases according to the natural history of chronic HBV infection, patients in the active liver disease phase had higher IFN-alpha expression compared to the immunotolerant and late phase patients (P < 0.01). Using double immunohistochemical staining, both IFN-alpha and cytoplasmic HBcAg were frequently detected near inflammatory infiltrates but no correlation existed between the hepatic expression of HBsAg and IFN-alpha. These data indicate that IFN-alpha is expressed in the liver in HBV-related active liver diseases and that the reported suboptimal production of IFN-alpha by PBMC in HBV-related chronic active liver diseases may be due to a redistribution of the IFN-alpha-producing mononuclear cells into the liver, the site of inflammation.
Collapse
|