R K Vasistha

Postgraduate Institute of Medical Education and Research, Chandigarh, Chandīgarh, India

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Publications (6)8.57 Total impact

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    ABSTRACT: Various histological and immunological methods have been used to detect the mechanoreceptors and nerve fibers on the intact ACLs as well as on the remnant stumps. However, some of these methods lack standardization, and the variable thickness of slices used often leads to misinterpretation. The study was based on the hypothesis that immunohistological methods are easier and more reliable means to demonstrate mechanoreceptors in the remnant ACL stumps as compared with the conventional methods. We also attempted to validate the methodology of immunohistology as a means of characterizing functional mechanoreceptors in the residual stump of an injured ACL. The remnants of the ruptured ACL in 95 patients were harvested during arthroscopic ACL reconstruction and evaluated immunohistologically using hematoxylin and eosin (H&E), and monoclonal antibodies to S-100 and NFP. Multiple sections from each specimen were serially examined by two histologists. The positivity of monoclonal antibody against NFP showed a statistically significant relationship with the presence of morphologically normal mechanoreceptors, whereas the positivity of monoclonal antibody against S-100 showed a statistically significant relationship with the presence of free nerve ending in the residual stump of an injured ACL. Immunological methods are more reliable and easier to use as compared with the conventional methods of histological staining for identifying remnant stumps likely to be of some proprioceptive benefit after an ACL injury. Such an identification might help us preserve certain remnant stumps during ACL reconstruction which might in turn improve the postoperative functional outcomes.
    No preview · Article · May 2011 · Knee Surgery Sports Traumatology Arthroscopy
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    Mandeep S Dhillon · Kamal Bali · R K Vasistha
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    ABSTRACT: To evaluate proprioceptive potential in residual remnants, tissue harvested from ruptured ACLs in 63 consecutive patients was examined for evidence of residual proprioceptive fibres using H&E, and monoclonal antibodies to S-100 and NFP (neurofilament protein). Histological examination showed good subsynovial and intra-fascicular vascularity with free nerve endings in the majority. Morphologically normal mechanoreceptors (H&E) and proprioceptive fibres (positivity with monoclonal antibody for NFP) were found in 46% and 52.4% of stumps, respectively. A statistically significant correlation between injury duration and persistence of mechanoreceptors and proprioceptive fibres was noted. More fibres were seen where ACL remnant was adherent to PCL. Our study has shown that persistent residual proprioceptive fibres in injured ACLs (especially early cases with PCL adherence) are significant; not shaving ACL remnants may be of potential benefit during ACL reconstruction, as some re-innervation and recovery of proprioceptive potential may be possible, thus improving clinical outcomes.
    Full-text · Article · Feb 2010 · International Orthopaedics
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    ABSTRACT: Synovial sarcoma (SS) is characterized by the t(X; 18) (p11.2; q11.2) translocation resulting in the SYT-SSX fusion transcript, detectable by reverse transcriptase polymerase chain reaction (RT-PCR). Fine-needle aspiration (FNA) cytology diagnosis of SS is challenging. We evaluated the applicability of RT-PCR on FNAs and to perform a detailed cytomorphological analysis in unequivocal cases of SS. A prospective and retrospective analysis was performed over 4 years (2003-2007). Prospectively, FNAs positive for the SYT-SSX fusion transcript by RT-PCR (n = 6) and, retrospectively, cases proven on histopathology and immunohistochemistry (ICC; positivity for vimentin and epithelial membrane antigen [EMA]/cytokeratin) as SS (n = 10) were included in the study. A detailed cytomorphological analysis was carried out. There were 9 biphasic and 7 monophasic tumors. The aspirates from both biphasic and monophasic tumors were richly cellular in all cases with micro tissue fragments. Pericapillary arrangement of tumor cells was present in most cases. Attempted gland formation was seen in 7 of 9 biphasic tumors. The individual tumor cells were round, ovoid, or spindle shaped. Pleomorphism was mild; monophasic tumors displayed lesser pleomorphism as compared with the biphasic ones. Nuclear chromatin was bland in all cases except 1 and nucleolar prominence was seen in just 3 biphasic tumors. Mast cells were seen in 3 biphasic and 2 monophasic tumors. Scanty to moderate extracellular matrix material was seen in 5 cases. FNA cytology of SS shows a spectrum of cytomorphological features; the diagnosis is confirmed by RT-PCR on the aspirated material for the SYT-SSX fusion transcript. Cancer (Cancer Cytopathol) 2009.
    Preview · Article · Apr 2009 · Cancer Cytopathology
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    ABSTRACT: The branchial cleft cyst also known as lateral cervical cyst is usually present in the lateral part of neck deep to sternocleidomastoid muscle at the junction of its upper third and lower two thirds. Branchial cysts are known for repeated infection with sudden increase in size and pain and for its recurrence. Thrombosis of major vessels of neck secondary to recurrent infection and inflammation of branchial cyst is extremely rare. Here we present the first case of internal jugular vein thrombosis; a rare complication seen with branchial cyst in a 54-year-old male. The patient was treated initially with antibiotics followed by excision of cyst and ligation of internal jugular vein without any complication.
    Full-text · Article · Sep 2007 · Indian Journal of Otolaryngology and Head & Neck Surgery
  • R R Sharma · R K Dhiman · Y Chawla · R K Vasistha
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    ABSTRACT: Hepatitis B virus infection constitutes a significant proportion of patients presenting with chronic hepatitis. Chronic hepatitis is said to be due to HBV if HBsAg is demonstrated in the serum with or without replication as determined by the presence of HBeAg in the serum. Immunohistochemical staining for HBsAg and HBcAg in liver tissue has been reported to improve the detection rate of HBV. To study positivity of immunohistochemical staining of liver tissue for HBsAg and HBcAg in patients of chronic hepatitis and correlate it with histological activity index. One hundred consecutive patients of chronic hepatitis were selected for this study. Histological scoring of liver biopsies was done using Knodell's numerical scoring system. Immunohistochemical staining was done by the Indirect immunoperoxidase technique using goat polyclonal anti-HBsAg and rabbit polyclonal anti-HBsAg. ELISA was used to detect HBsAg in the serum. Serum HBsAg was positive in only 40 patients whereas tissue HBsAg was positive in 48 patients. Thirteen of these forty-eight tissue positive HBsAg patients also showed HBcAg on immunohistochemical staining of liver tissue. Patients with higher grades of histological activity index (HAI) score had higher values of serum bilirubin and prothrombin time as compared to the patients with a low HAI score. Significantly higher levels of serum transaminases (AST/ALT) were observed in patients who were positive for both HBsAg and HBcAg when compared with patients positive for HBsAg or HBsAg negative patients. A mixed pattern (diffuse/focal cytoplasmic and membranous) of surface antigen expression was seen in 83.3% patients, whereas expression of core antigen was predominantly nuclear (77%). There was no significant correlation between the pattern of antigen expression and HAI score.
    No preview · Article · Jan 2002 · Tropical gastroenterology: official journal of the Digestive Diseases Foundation
  • G Makharia · R K Dhiman · Y K Chawla · R K Vasistha
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    ABSTRACT: A 53-year-old man suffering from rheumatoid arthritis for 15 years presented with bleeding esophageal varices, hepatosplenomegaly and normal splenoportal venous axis. Liver biopsy revealed mild fibrosis, suggestive of non-cirrhotic portal fibrosis (NCPF). There are reports of the association of idiopathic portal hypertension, a condition similar to NCPF, with progressive systemic sclerosis, Hashimoto's thyroiditis and systemic lupus erythematosus.
    No preview · Article · Sep 2001 · Indian Journal of Gastroenterology