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Biomedical subjects

F Saidi

Publications and source records attributed to F Saidi.

At least 37 records · Page 2Linked to original sources
PubMed1991

Endothoracic endoesophageal pull-through operation. A new approach to cancers of the esophagus and proximal stomach.

Many thoracic surgeons have expressed concern about the complications inherent in transhiatal esophagectomy without thoracotomy. The technique of endothoracic endoesophageal pull-through uses a mucosal coring of normal esophagus beyond the tumor and leaves a muscular tube through which the substitute organ is passed. Mediastinal hemorrhage, tracheal injury, and chylothorax are eliminated.

Aged↗
PubMed1990

Intraoperative bronchial aspiration of ruptured pulmonary hydatid cysts.

Ruptured pulmonary hydatid cysts are seen clinically and radiologically as persistent cavitary lesions of the lung. Bronchi opening into the pericyst cavity allow for discharge of fluid matter but not the escape of solid remnants of the collapsed parasite. Operative manipulation of the involved lung in the course of surgical management of chronic ruptured pulmonary hydatids can force fragments of the laminated membrane or small daughter cysts into the bronchial tree. Such extruded solid fragments lodge in bronchi of the same or opposite lung with resulting acute obstruction of airways. Intraoperative bronchial aspiration of hydatid material was seen in 7 patients with ruptured hydatid cysts of the lung, either primary or secondary to transdiaphragmatic extension of liver hydatids. The first clinical sign can be unexplained difficulty in ventilation. Effective management consists of prompt exposure of the stem bronchus on the operative side, with bronchotomy for suction retrieval of escaped solid fragments of the parasite.

Adult↗
PubMed1988

Endoesophageal pull through. A technique for the treatment of cancers of the cardia and lower esophagus.

Transthoracic and extrathoracic approaches to cancers of the lower esophagus and cardia each have advantages and drawbacks; the trauma of thoracotomy must be balanced against that of blunt mediastinal extraction of the esophagus. A different surgical approach is proposed in this paper, avoiding both thoracotomy and encroachment upon thoracic mediastinal structures. This technique is based on the removal of the tumor and the esophageal mucosa above it as a distinct anatomic layer by blunt dissection through separate abdominal and neck incisions. This is followed by pulling upward a segment of stomach (or colon) through the esophageal muscular tunnel into the neck for a cervical anastomosis. This endoesophageal pull through (EEPT) approach has been used in the surgical treatment of a total of ten patients, six with adenocarcinomas of the cardia and four with squamous cell carcinomas of the lower esophagus. In nine patients the stomach, and in one patient the left colon, was brought to the neck to reestablish gastrointestinal (GI) continuity. The operation was well tolerated. There was no excessive intraoperative or postoperative bleeding, and there was no in-hospital mortality up to 30 days. The major postoperative complication was cervical anastomotic leakage seen in four patients. The EEPT technique is a palliative approach for cancers of the lower esophagus and cardia, comparing favorably with the standard extrathoracic or transthoracic transhiatal procedures.

Anastomosis, Surgical↗
PubMed1983

Development and characteristics of an oestrogen sulphotransferase in placenta and uterus of the pregnant mouse. Comparison between mouse and rat.

The mouse placenta possesses a soluble oestrogen sulphotransferase activity which increases markedly from at least 12 days of gestation until term. At about 16 days of gestation, a similar activity is found in the uterus. This activity also increases until term and disappears rapidly post partum. The uterine enzyme activity appears to require the presence of the foetal unit for its onset, since unoccupied horns, whether their endometrial stromal cells are differentiated to decidual cells or not, are essentially devoid of it. Uterine cytosols from non-pregnant mice are also inactive in this respect. In late gestation, the uterine sulphotransferase is confined to the decidua basalis, the areas to which the placentas are attached. The sulphotransferase(s) of placenta and uterus has an absolute requirement for 3'-phosphoadenosine 5'-phosphosulphate, and possesses little activity in the absence of exogenous thiol groups. Stimulation is also seen in the presence of Mn2+, Mg2+ or Ca2+. Oestrone and oestradiol, and to a lesser degree oestriol, are substrates for the enzyme(s), whereas testosterone, cortisol and dehydroepiandrosterone are not. Oestrone and oestradiol at higher concentrations (1.0-1.5 microM) completely inhibit the enzyme(s). These enzymes could play a role in altering tissue concentrations of active oestrogens during gestation in the mouse. Oestrogen sulphotransferase activity is low or absent in reproductive tissues of the pregnant rat.

Animals↗
PubMed1983

Estrogen sulfotransferase activity in guinea pig uterus and chorion.

An estrogen sulfotransferase (ST) is detectable in high speed supernatants of pregnant guinea-pig uterus and shows maximum activity between about 47 and 55 days of gestation, with a decrease toward term. No appreciable activity was apparent in the non-pregnant state or before at least 43 days of pregnancy. A considerably higher ST activity is present in chorion as early as 30 days of gestation, and this also decreases toward term. The two ST's exhibit similar KM (0.1-0.13 microM with estrone as substrate) and pI (5.8) values, as well as similar specificities. Estradiol-17 beta and estriol are sulfurylated 82 and 6% that of estrone at equimolar concn. Neither p-nitrophenol nor several neutral steroids are substrates for the enzymes. Enzyme activity is poorly expressed in the absence of thiol groups, the presence of monothioglycerol stimulating uterine and chorion enzymes by 5- and 15-fold, respectively. Stimulation is also observed in the presence of Mg2+, Ca2+ or Mn2+. Chromatofocusing on a poly buffer ion-exchanger from pH 7.4 to 4.0 resulted in elution of a sharp peak of enzyme activity, at pH = 5.8, from both tissues provided that the eluting buffer contained thiol groups and 0.25 M sucrose. This single step resulted in at least a 35- to 100-fold increase in specific activity. The partially purified enzyme from chorion exhibited a KM for estrone of 0.13 microM.

Animals↗
PubMed1982

Estrone sulfatase activity in guinea pig tissues.

Estrone sulfatase activity is widespread in guinea pig tissues. Whole homogenates of adult testis, uterus, lung, adrenal, amnion, ovary, chorion, small intestine, placenta, spleen, kidney and liver exhibit approximately descending order of specific activity. Certain properties, including pH requirement, lack of inhibition by inorganic sulfate and magnitude of estimated Km values, are similar to that for arylsulfatase C of rat liver. Of the subcellular fractions prepared from guinea pig tissues, microsomes exhibit the highest specific activity although considerable enzyme activity remains associated with large cellular fragments sedimenting at 750 g. The sulfatase activity is readily inhibited by inorganic phosphate even when substrate concentration satisfied zero order kinetics. Rat liver arylsulfatase C is not inhibited under these conditions. Sensitivity of the guinea pig enzyme activity to inhibition by a variety of steroids and related compounds, is markedly less than for rat liver. Diethylstilbestrol(DES) strongly inhibits the rat liver enzyme but has little effect on the guinea pig liver system. Guinea pig testicular activity is suppressed to a degree intermediate between these extremes by increasing DES concentration. In guinea pig lung, kidney, and possibly liver, elevated fetal enzyme activities decrease from neonatal to adult life. Testicular activity appears to follow the opposite trend. Uterine enzyme activity is not markedly affected by pregnancy.

Age Factors↗
PubMed1978

Postoperative recurrence of hydatid disease.

Since larval scolices of the parasite Echinococcus granulosus are capable of developing in vivo into mature hydatid cysts in the human intermediate host, operative spillage of cyst contents can lead to local regrowth of hydatid cysts after a suitable interval. The overall rate of postoperative recurrence of hydatid cysts of soft tissue organs in 106 patients, followed-up from 6 months to 3 years, was 11.3 per cent. Both host and parasite factors determine recurrence. Serosal and surgical wound surfaces, unlike mucosal surfaces, provide fertile ground for the development of implanted scolices into hydatid cysts. No correlation was found between the size of removed cysts and postoperative recurrence. The risk of recurrence and associated morbidity was highest in patients with multiple intra-abdominal cysts. Certain technical problems increase the chance of inadvertent operative rupture and spillage of cyst contents, with subsequent regrowth of cysts. Routine measures against operative spillage of hydatid fluid are mandatory, but the actual method of surgical treatment must be individualized for every case.

Adolescent↗
PubMed1977

A new approach to the surgical treatment of hydatid cyst.

Hydatid cysts of soft-tissue organs occur in five forms: univesicular, multivesicular, calcified (aborted), ruptured (into adjacent body cavities or host organ ducts), and infected. Each of these distinct forms requires an appropriate surgical approach. For uni- or multivesicular cysts uncontrolled spillage of fertile elements of the parasite is a major hazard. A new method using local freezing of the cyst's outer layer and 0.5% silver nitrate as a scolicidal agent effectively overcomes this problem. Calcified cysts can be left alone. Suppuration or rupture into adjacent body cavities or internal organ channels must be handled according to basic surgical principles and all of the parasitic material removed.

Cryosurgery↗