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Biomedical subjects

S A Samad

Publications and source records attributed to S A Samad.

At least 19 recordsLinked to original sources
PubMed1999

The use of an in-house modified double antibody sandwich ELISA to detect Aspergillus antigens in sera of immunosuppressed patients.

AIM: The purpose of this study was to retrospectively detect Aspergillus antigens in sera obtained from immunocompromised host using an in-house modified double antibody sandwich ELISA. MATERIALS AND METHODS: The ELISA employed the use of polyclonal antibodies raised against a water-soluble (WS) mycelial component of a clinical isolate of Aspergillus fumigatus. Rabbit and guinea-pig anti-WS antibodies were used as the capture and detector antibodies respectively. This was followed by the addition of anti-guinea pig antibodies conjugated to horse radish peroxidase and orthophenylenediamine. RESULTS: Of 143 specimens obtained from 140 patients, only 5 (3.5%) specimens demonstrated the presence of antigen. The 5 antigen-positive sera were from three patients. One was a confirmed case of paranasal aspergillosis and the other two were probable cases of invasive aspergillosis. CONCLUSION: The clinical validity of the ELISA should be determined by prospective detection of Aspergillus antigens in multiple serum samples collected from proven cases of invasive aspergillosis.

Adolescent↗
PubMed1998

Huge adrenal haemangioma.

Adrenal tumours are either functioning or non-functioning. Non-functioning adrenal tumours are generally asymptomatic and usually of enormous proportions at the time of presentation. A case is presented here of a patient with a huge right adrenal haemangioma which was successfully treated surgically. This unusual tumour was 25 cm in diameter, was well encapsulated and weighed 4 kg. The literature pertaining to this interesting case is reviewed.

Adrenal Gland Neoplasms↗
PubMed1998

Tumoral cystitis in children.

Three children aged 3-11 years had ultrasonography of the urinary tract for the investigation of dysuria and haematuria. A bladder mass was seen in these 3 children. One child had computed tomography scan, cystoscopy and bladder biopsy because rhabdomyosarcoma was considered. The biopsy revealed an inflammatory process. The urine culture of the other 2 children revealed E. coli. On ultrasonography, the inflammatory mass may appear homogeneously hypoechoic or may contain moderate level echoes. The mucosal surface of the mass may be smooth or lobulated. It is important to consider an infective cause for a bladder mass in children because computed tomography, cystoscopy and biopsy may be avoided.

Anti-Infective Agents, Urinary↗
PubMed1997

Primary repair with in-situ interposition graft for infrarenal mycotic aortic pseudoaneurysm.

This is a case report of a pseudoaneurysm due to Salmonella aortitis in a 52 year old man. The condition is rare and represents one of the few cases reported in Malaysia. The diagnosis was made preoperatively by ultrasonography and computed tomography. This was confirmed at surgery where there was a 3 cm defect at the posterior wall of the aorta at L2/3 level. The aneurysmal sac extended to the retrocrural space at the 12th vertebra level cranially on the right side to the lower border of the 3rd lumbar vertebra caudally. It had a smooth fibrous wall and contained a mixture of organised haematoma and pus. At operation the aneurysm was excised, the affected region was carefully debrided and the aorta grafted with an in-situ in-lay graft. Antibiotic therapy was instituted until clinical response was evident, leukocytosis was reduced and blood culture was negative. However 4 months after surgery, the patient returned in irreversible shock and succumbed to disseminated intravascular coagulation secondary to massive upper gastrointestinal haemorrhage from an aortoduodenal fistula.

Aneurysm, False↗
PubMed1996

Brain calcification in patients with cerebral lupus.

Cerebral lupus (CL) is a common cause of morbidity and mortality in patients with SLE. The brain CTs of 27 consecutive adult patients with SLE and various neurological presentations were reviewed. The median age and duration of neurological symptoms at the time of the brain CT were 30 years (range = 14-51 years) and six days (range = 1 day-22 years), respectively. Eleven patients (41%) had normal CTs. The abnormalities in the remaining patients could be divided into six categories: (a) cerebral atrophy alone (two patients); (b) calcification alone (three patients); (c) infarct(s) alone (five patients); (d) cerebral atrophy and calcification (three patients); (e) cerebral atrophy and infarct(s) (one patient) and (f) cerebral atrophy, calcification and infarct(s) (two patients). Altogether eight patients (30%) (age range = 17-47 years) had intracerebral calcification: the globus pallidus was involved in all, putamen in two, head of the caudate nucleus in one, thalamus in one, centrum semiovale in two and cerebellum in three patients. Two patients had extensive calcifications of most of the basal ganglia, centrum semiovale and cerebellum. There was no relationship between the presence/degree of calcification and age of patients/duration or type of neurological presentation. The pathogenesis of cerebral calcification in CL is unknown. Cerebral lupus must now be included in the differential diagnosis of intracerebral calcification.

Adolescent↗
PubMed1996

A report of the first three cases of diffuse panbronchiolitis in Malaysia.

Three cases of diffuse panbronchiolitis (DPB) occurring in two Malaysian Chinese patients and one Malay patient are reported. They had similar clinical, radiological and physiological features which are characteristic of DPB. The diagnosis in one of the cases was confirmed histologically by transbronchial lung biopsy. These could be the first three cases identified in Malaysia.

Adult↗
PubMed1996

Spinal dural arteriovenous malformation: a cause of myelopathy.

Spinal vascular malformation is an uncommon but potentially treatable cause of myelopathy. We describe two cases of angiographically proven spinal vascular malformation in Malaysia. The first case is a 47-year-old man who had a progressive myelopathy and the second a 60-year-old man with intermittent attacks of transient paraparesis leading to paraplegia. As the clinical presentation of spinal vascular malformation is variable, it should be considered as a cause of patients with myelopathy.

Angiography↗
PubMed1996

The role of ductography in patients with nipple discharge.

The main objective of this study is to illustrate the role of ductography in the management of nipple discharge. Thirty-six patients had ductography for the investigation of blood-stained or serous nipple discharge. The ductogram findings were reviewed. Ductography showed an intraductal lesion in 13 patients, duct ectasia in 16 and normal ducts in 7. Fourteen patients had surgery. Eight had preoperative ductography using a mixture of methylene blue and contrast media. Histology revealed 5 cases of duct papilloma, 2 cases of epithelial hyperplasia, 4 cases of fibrocystic change and 3 cases of duct ectasia. Twenty had follow-up without surgery and of these, the nipple discharge ceased in 11 patients. Two patients did not come for follow-up. Ductography has a significant role in the management of nipple discharge. Firstly, surgery might be averted in patients with normal ducts or duct ectasia on ductography. Secondly, intraductal methylene blue will demonstrate the abnormal ductal system to the surgeon and allow for a less radical surgery.

Breast Diseases↗
PubMed1995

Chronic nephrotoxicity of anti-inflammatory drugs used in the treatment of arthritis.

We determined the consumption of non-steroidal anti-inflammatory drugs (NSAIDs) and the prevalence of chronic renal impairment and renal papillary necrosis (RPN) in patients with various types of arthritis. Ninety-four patients with chronic arthritis who had consumed more than 1000 capsules and/or tablets of NSAIDs were studied. Renal profiles and radiological investigations such as intravenous urogram (IVU), ultrasonography (US) and computed tomography (CT) were performed to look for evidence of RPN. Twelve patients did not complete the study. Ten of the 82 patients who had completed the study (12.2%) had radiologic evidence of RPN. Five out of 53 patients (9.4%) with rheumatoid arthritis, three out of 11 patients (27.3%) with gouty arthritis and two out of seven patients (28.6%) with osteoarthritis had RPN. Renal impairment (serum creatinine levels of 125-451 mumol/l) was found in 20 patients (24.4%). The patients had consumed 1000-26,300 capsules and/or tablets over a period ranging from 1 yr to more than 30 yr. Patients with chronic arthritis who consume excessive amount of NSAIDs are at risk of developing RPN and chronic renal impairment.

Adult↗
PubMed1995

Ultrasound (US) and computed tomographic (CT) appearances of large (giant) hepatic cavernous hemangiomas.

The sonographic and CT appearances of 9 large cavernous hemangiomas of the liver were studied. On sonography, 6 masses (67%) exhibit heterogenous echo pattern; where in 2 patients the echotexture was a mixture of hypoechoic and isoechoic areas and in 4 patients there are varying amounts of bright hyperreflective areas similar to the texture typical of small hemangiomas. The masses were predominantly hypoechoic in the remaining 3 patients (33%). Incremental bolus or bolus-infusion dynamic CT showed peripheral contrast enhancement of varying intensities and thickness in all patients. The lesions were incorrectly diagnosed as hepatomas in 4 patients, suspected as hemangiomas with a differential diagnosis of hepatomas in 4 patients and an early liver abscess in 1 patient. It is concluded that large cavernous hemangiomas of the liver do not exhibit the typical homogenous hyperreflective echotexture as exhibited by small lesions and they mimic primary and secondary hepatic neoplasms. However, the diagnosis of hemangioma should be entertained when such a mass contains bright hyperechoic areas within its heterogenous echo pattern and exhibit peripheral enhancement on contrast enhanced CT. In addition to correlation with appropriate clinical information, confirmation of diagnosis include delayed scanning during a routine incremental bolus dynamic CT, single-slice dynamic contrast enhanced CT, angiography or isotope scintigraphy and magnetic resonance imaging depending on the availability of facility.

Adult↗
PubMed1994

Chronic renal disease and papillary necrosis associated with the long-term use of nonsteroidal anti-inflammatory drugs as the sole or predominant analgesic.

The risk of renal papillary necrosis and renal dysfunction due to the chronic use of nonsteroidal anti-inflammatory drugs (NSAIDs) is unknown. In a prospective study of 259 heavy analgesic users seen in a general medical hospital over an 11-year-period beginning in January 1982, 69 new cases of analgesic nephropathy with renal papillary necrosis were confirmed by intravenous urogram (26.6%), ultrasonography (30.4%), and/or computed tomography (43%). Twenty-nine of these patients (42%) had consumed excessive quantities of NSAIDs alone; an additional nine patients (13%) had consumed NSAIDs predominantly in combinations with paracetamol, aspirin, phenacetin, caffeine, and/or traditional herbal medications. Of those patients who consumed NSAIDs alone, 17 had consumed only a single type of NSAID and the remaining 12 had consumed multiple types of NSAIDs. The amount of NSAIDs administered ranged from 1,000 to 26,600 capsules or tablets over a 2- to 25-year period. Renal impairment (serum creatinine, 126 to 778 mumol/L) was noted in 26 of these 38 patients (64.8%). The reasons given for consuming NSAIDs include gouty arthritis (18 patients), osteoarthritis (seven patients), rheumatoid arthritis (six patients), chronic headache (three patients), gouty arthritis plus chronic headache (three patients), and chronic backache (one patient). All patients were prescribed these drugs and were followed medically. The occurrence of analgesic nephropathy was predominantly in males (male to female ratio, 1.9:1). Most of the patients did not have the characteristic psychological profile attributed previously to analgesic abuse nephropathy. Associated addictive habits, such as the use of psychotropic drugs and sleeping tablets, purgative abuse, and alcoholism, were absent.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1994

Polycystic liver disease treated by fenestration and segmental liver resection.

A case of symptomatic polycystic liver disease treated by fenestration and segmental liver resection is reported. The intraoperative use of ultrasound to define the plane of liver resection is emphasised. No significant post-operative complication was encountered. The clinical presentation, management and treatment are discussed.

Cysts↗
PubMed1994

Superselective mesenteric arterial branch cannulation for intraoperative identification of bleeding intestinal mucosal lesions.

The intraoperative localisation of small intestinal bleeding lesions identified at pre-operative angiography has always been difficult, resulting in extensive resections in doubtful cases. We report two patients in whom, at angiography, a small intestinal lesion was noted to be the cause of gastrointestinal haemorrhage. They then underwent superselective mesenteric arterial cannulation at a second angiographic procedure and were operated upon with the angiographic catheter left within the branch responsible for the bleeding. This superselective catheter placement facilitates precise localisation of the bleeding site intraoperatively, enabling limited segmental resection of bowel. Both patients have had no recurrent bleeding episodes.

Adult↗
PubMed1993

Analgesic use and chronic renal disease in patients with headache.

The pattern of analgesic use, abuse and incidence of analgesic-associated nephropathy in 79 patients with chronic headache was studied. Sixty-eight of these patients had migraine. Most patients had consumed a combination of analgesics (81%) while 19% had taken single analgesics for their headache. Nonsteroidal anti-inflammatory drugs were the most commonly used analgesics (96.2%) followed by paracetamol (70.9%) and aspirin, phenacetin and caffeine compounds (5.1%). Mefenamic acid was the commonest nonsteroidal anti-inflammatory drug consumed (97.4%). Analgesic abuse which was defined as a minimum total of 1 kg of analgesics such as paracetamol or aspirin, phenacetin and caffeine compounds or 400 capsules/tablets of nonsteroidal anti-inflammatory drugs was noted in 65 patients. Nonsteroidal anti-inflammatory drugs were the most commonly abused analgesics (89.2%) followed by paracetamol (38.5%). Forty-five of the 65 analgesic abusers had an intravenous urogram or ultrasound performed and renal papillary necrosis was documented in one patient. Three (4.6%) of the analgesic abusers had mildly raised serum creatinine levels. Mild proteinuria of less than 1 gm/litre was present in 27.7% of abusers. In conclusion, although analgesic use and abuse is common in patients with chronic headache, the short term incidence of analgesic-associated nephropathy (2.2%) and renal impairment (4.6%) was low. Prolonged observations will be necessary to ascertain the safety of these drugs for long term use.

Analgesics↗
PubMed1993

Ultrasound guided percutaneous biopsies of suspected mediastinal lesions.

Realtime ultrasonography with general purpose sector transducer was used to guide 87 percutaneous biopsies on 82 patients with lesions suspected to be mediastinal masses on plain chest radiographs. In seven patients who had dyspnea the biopsies were done in erect or semi-erect sitting positions. Definitive diagnosis was obtained from 66 lesions (80.5%) where 46 (70.0%) were mediastinal and the remaining 20 lesions (30.0%) arising from the lung. Of the 46 mediastinal lesions where specific diagnosis were made, 42 (91.0%) were anterior and four (0.9%) posterior mediastinal lesions. The majority of these anterior mediastinal masses were lymphomatous nodes followed by germ cell tumours whereas all four posterior mediastinal masses were neurogenic. Of the lung lesions, 19 were primary malignancies. The remaining lung lesion which was located posteriorly was cryptococcus infection. One patient developed massive hemothorax, but subsequently recovered. No significant complications were encountered in the remaining patients. Surgery was carried on 11 patients. There is correlation between definitive diagnosis from percutaneous biopsy and final diagnosis after surgery in 80% of patients. It is proposed that all percutaneous biopsies for thoracic masses which abut the chest wall and cause mediastinal widening on a plain chest radiograph be guided by ultrasound. It can be effectively accomplished with ease and safety even without the use of dedicated biopsy ultrasound probes or biopsy attachments, and on patients in erect or semi-erect positions.

Adolescent↗
PubMed1993

Gas-containing liver abscesses: assessment by ultrasound (US) and computed tomography (CT).

Single gas-containing pyogenic liver abscesses in 11 patients were studied by ultrasound and computed tomography (CT). On ultrasound, all abscesses were predominantly echogenic compared to the normal liver parenchyma. The gas collections appeared as hyperreflective areas arranged in clusters associated with acoustic shadowing and ring-down artifacts. Ten abscesses (90%) had ill-defined margins on ultrasound, causing underestimation of their sizes in these patients. All abscesses were shown to be multiloculated and had clearly defined borders on CT, not appreciated or mistaken for multiplicity of abscesses on ultrasound. Ultrasound may be inadequate in the evaluation of gas-containing liver abscesses, as they have complex echotexture in addition to ring-down artifacts, acoustic shadows and poorly-defined margins; leading to underestimation of abscess size, difficulty in identifying loculations and erroneous interpretation of multiplicity of abscess cavities.

Adult↗
PubMed1991

X-ray inactivation, Weigle reactivation, and Weigle mutagenesis of the lysogenic Vibrio kappa phage.

Vibrio cholerae lysogenic kappa phage was inactivated by X-ray (60 kV) in a dose-dependent manner, the inactivation dose leading to 37% survival (D37) in phosphate-buffered saline (PBS), pH 7.4, being 0.36 kGy. The phages were significantly protected against X-ray irradiation when histidine or cysteine or both were present in PBS or when phages were irradiated in nutrient broth. Maximum protection was offered when both histidine (10.0 mM) and cysteine (10.0 mM) were present in PBS (dose enhancement factor being 4.17). The X-irradiated kappa phages also underwent a small but significant Weigle reactivation and also Weigle mutagenesis in the UV-irradiated V. cholerae host H218Smr. The Weigle factor or the frequency of clear-plaque mutants increased with increasing UV dose, attained a maximum at a UV dose of 2.4 J m-2, and thereafter decreased gradually with a further increase of the UV dose. The X-ray dose (D)--survival (S) curves could be empirically described by the equation S = exp[-(aD + bD2)], where a and b are constants depending on the irradiation conditions, and a good agreement between the theoretical curves and experimental data was obtained.

Bacteriophages↗