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Antiestrogen therapy is active in selected ovarian cancer cases: the use of letrozole in estrogen receptor-positive patients weight loss 800 calories per day discount xenical on line. Although primarily an adult cohort weight loss pills europe purchase xenical 120mg amex, germ cell tumours may require surgical intervention in young children weight loss pills zi xiu tang order xenical 120 mg fast delivery. Procedures range from day cases to prolonged open pelvic surgery weight loss ky effective xenical 60 mg, and raise significant anaesthetic and critical care issues. Several risk indices have been developed attempting to correlate clinical characteristics with peri-operative cardiac mortality and morbidity. The Lee index, a modification of the original Goldman index (1977), is considered by many clinicians to be the best currently available cardiac risk prediction index in non-cardiac surgery. The Lee index contains five independent clinical determinants of major peri-operative cardiac events in patients having high-risk types of surgery: a history of ischaemic heart disease, a history of cerebrovascular disease, heart failure, insulin-dependent diabetes mellitus and impaired renal function. All factors contribute equally to the index (a point each), and the incidence of major cardiac complications is estimated at 0. A peri-operative plan of management, further investigation if necessary and a plan for medication in the lead up to surgery, need to be carefully considered. In general, medications are taken as normal on the day of surgery, but for angiotensin-converting enzyme inhibitors only after anaesthetic consultation. Anticoagulant therapy demands risk-benefit analysis and is only discontinued when haemostasis is an anticipated problem. Pre-Operative Anaesthetic Considerations Information from pre-operative assessment aids anticipation of potential peri-operative problems, helps predict any requirement for postoperative critical care management and permits optimisation of patient care. Patient assessment must evaluate: Pre-existing co-morbidity and limitations on physiological reserve. Ongoing disease process and respiratory/cardiovascular/ gastrointestinal compromise as a result of, for example, a pelvic mass, neoplastic metastases or paraneoplastic syndromes. Cardiac, gastrointestinal, haematological and hepatic toxicity have been associated with various chemotherapeutic agents, in particular, platinum-based agents and anthracyclines. Investigations frequently required include blood biochemistry, blood counts and coagulation. Special aspects of pre-operative assessment in this patient group concern (i) cardiovascular disease (ii) respiratory disease (iii) endocrine disease and (iv) obesity. Asthmatic patients can be at risk during anaesthesia due to the increased irritability of the bronchial smooth muscle and it is important to ascertain precipitating factors, recent hospital admissions, the necessity for previous steroid control, current exercise tolerance and peak expiratory flow rate. Smoking may complicate the effects of asthma and patients should be encouraged to stop smoking for at least 48 hours before surgery. They may then recommence medication with a normal diet after more minor operations. Patients with established thyroid disease should have recent normal thyroid function tests and be clinically euthyroid prior to proceeding with elective surgery. A raised index of suspicion of undiagnosed thyroid disease must be maintained for those noted to be symptomatic, in particular, a new arrhythmia or change in weight. Gynaecological procedures such as dilatation and curettage, colposcopy, hysteroscopy and laparoscopy lend themselves well to the day surgical setting. Conditions such as obesity and diabetes offer contention over management and institutions running day case units should have guidelines outlining policy. Patients who are morbidly obese (body mass index >35 kg/m2) are high risk for anaesthesia as well as surgery. Problems include difficult airway management, poor venous access, an increased incidence of cardio-respiratory complications and an increased risk of regurgitation and aspiration. Sleep apnoea and postoperative hypoxaemia are common, and the patient may require a period of mechanical ventilation postoperatively and should be managed on the intensive care or high-dependency unit. Patients who have had gastric banding to manage obesity may have a reduced rate of gastric emptying and a potentially raised risk of regurgitation. Laparoscopic Procedures Respiratory and cardiovascular compromise as a consequence of the pneumoperitoneum raises significant anaesthetic concerns. Bradycardia after peritoneal insufflation is common, rarely progressing to asystole, so rapid deflation may be required if there is inadequate response to treatment with vagolytic agents such as glycopyrrolate or atropine. The increased intra-abdominal pressure may reduce systemic blood pressure by reducing venous return. Often however, no change in systolic blood pressure is observed as it is maintained by a compensatory increase in systemic vascular resistance. Surgical emphysema as a result of an inadequately advanced Veress needle may be an additional cause of rising blood carbon dioxide level, requiring management with a period of prolonged ventilation under anaesthesia. In offering the option of remote precise control of surgical instruments and reduced hospital stay, the process also presents new anaesthetic challenges. Pre-assessment should occur at a time pre-operatively that allows sufficient time to arrange for further investigation or medical management. Major Operations these include abdominal hysterectomy, radical trachelectomy, lymph node dissection and major vulval surgery. In addition, major operations may be undertaken in stages or involve redo processes with incumbent surgical, anaesthetic and critical care implications. Day Case/Minor Operations Day case surgery continues to expand to include more complex patients and surgical procedures.
If the circumcision is made at the correct level the rectovaginal space is opened up immediately and the rectum can be stripped from the vagina quite easily with the finger weight loss virtual model xenical 60mg discount. Anteriorly weight loss pills mexico order xenical 60mg on-line, if the circumcision lies below the neck of the bladder weight loss workout plan for women generic 120 mg xenical fast delivery, as it should weight loss lipozene safe 60 mg xenical, the vagina Urogenital diaphragm Cut edge of levator ani muscle Fat of ischiorectal fossa Rectum covered by its fascia 304. The skin of the perineum is incised on one side of the midline extending deeply to expose the rectum covered by its fascia, the levator ani muscle and the fat of the ischiorectal fossa. Uterus and Cervix Cancer vaginal cuff posteriorly and the surgeon cutting through the loose tissue contained in the space with dissecting scissors. On each side of the vesicovaginal space is the downward prolongation of the bladder pillar. This tissue passes from the vesical fascia downwards and is attached to the vaginal fascia; posteriorly it passes into the medical aspect of the cardinal ligament. In the midline, between the bladder pillar on each side, lies the vesicocervical ligament which limits the vesicovaginal space superiorly. Unless the growth has infiltrated anteriorly there should be no difficulty in dividing the vesicocervical ligament. A retractor is placed below the bladder and the bladder drawn up by an assistant to stretch the vesicocervical ligament; this is cut through with scissors and great care must be taken to avoid injury to the bladder when the subjacent growth has produced an inflammatory reaction between the vagina and the bladder. If the growth is advanced, difficulty may be experienced in separating the bladder from this part of the cervix. Identification of the Ureter: this is the most difficult and important part of the operation. For the right ureter to be dissected clear, using a deep vaginal retractor, one assistant draws the bladder upwards and retracts the right side of the vagina away from the operation site with a second retractor: the second assistant, standing on the left side of the patient, draws the traction Opened vesicocervical space 16. The attachments of the medial and lateral surfaces of the vesico-uterine ligament are exposed and can be divided without injury to the bladder. A Schuchardt incision has been made, the vagina circumcised and the upper cuff of the vagina closed with clamps. The black line indicates the position through which the tissues are divided to separate the ureter and the bladder from the uterus and vagina. If made too close to the bladder and ureter there is a risk of damage to these structures, while if placed too near the cervix and the vagina some of the tumour may be left behind. In the Figures, four clamps are shown as vaginal tractors but strong sutures are as effective and less in the way of the surgeon. Passing from the midline laterally the incision should pass mainly horizontally and a little upwards. Some haemorrhage is nearly always encountered and bleeding vessels must be picked up and ligated or diathermied. The ureter, together with the ureteric canal, lies relatively high up, and the ureter and bladder are drawn up by the assistant. After the bladder pillar has been divided, fatty tissue appears surrounding the ureter as it lies in the ureteric canal. The ureteric canal can now be felt quite easily with the finger, and its lateral wall should be carefully cut through. As soon as the ureter can be identified by sight, the major difficulty of the operation is overcome. The more the vaginal cuff is drawn downwards, the more easily can the ureter be dissected clear. A small curved vaginal retractor is placed laterally to expose the uterine vessels and to draw the ureter laterally. It is recommended at this stage of the operation that the ureter should be retracted laterally as far as possible, and the uterine vessels cut on the medial side of a ligature introduced with an aneurysm needle. The more laterally the uterine vessels are divided the more parametrium will be removed. The inexperienced tend to cut through the bladder pillar too far away from the bladder and are apt to be worried by haemorrhage and oozing from the cut bladder pillar. At this stage of the operation the urethra, the bladder and the ureters have been dissected clear but the uterovesical pouch of the peritoneum has not been opened. Opening of the Pouch of Douglas: the next step in the operation consists of the identification of the peritoneum of the pouch of Douglas. It will be remembered that the rectovaginal space can be identified quite easily and that the rectum can be pushed backwards by means of a finger introduced into the space. At the upper part of the space fatty tissue and the fascia of Denonvilliers lie below the peritoneum of the pouch of Douglas, and this tissue helps in the identification of the position of the peritoneum. The peritoneum is now divided and opened in the midline with curved scissors and the peritoneum cut through on each side as far as the uterosacral ligaments. The assistants draw the vaginal cuff upwards and also, by introducing a speculum into the pouch of Douglas, draw upwards the posterior surface of the vagina and uterus. On the two sides lie the uterosacral ligaments, together with their downward prolongations. These must now be divided, preferably distal to clamps appropriately placed, but if this is found impossible they can be cut through with scissors close to the rectum and the bleeding points picked up subsequently with artery forceps. Haemorrhage is not necessarily troublesome at this stage of the operation, although in some cases large vessels Lateral wall of the ureteric canal 16. The bladder is retracted away and the uterovesical pouch of peritoneum can be seen. The right ureter has been separated from its anterior attachments to the vesico-uterine ligament. To overcome difficulties such as controlling haemorrhage and obtaining satisfactory exposure much depends on the skill of the assistant using a retractor. Fat of the paravesical fossa Division of Cardinal Ligaments: On each side the cardinal ligament must now be divided as far laterally as possible.
Similarly weight loss pills houston tx buy discount xenical 120mg line, sub-diaphragmatic peritoneum may be excised by mobilising the liver and transecting the falciform ligament in order to facilitate access weight loss pills khloe took buy xenical 60 mg with mastercard. It is therefore possible to predict sub-optimal cytoreductive surgery17 and to use a predictive index score based on radiographic criteria and performance status weight loss blogs cheap 60mg xenical. The aim for all patients having primary surgery is cure weight loss pills natural cheap xenical line, or at least optimal resection of tumour to allow a good response to chemotherapy. For some patients with advanced disease surgical resection may give palliative relief in situations such as obstruction, haemorrhage, perforation, or acute pain. The surgeon involved needs to be clear about the purpose of surgery and to explain this to the patient and her relatives. Whilst a diagnostic assessment may be achieved successfully in the majority of cases by laparoscopy, resection of large bulky tumours safely is not always possible. Rupture resulting in tumour spillage19 or possible port site metastases can occur. Laparotomy and traditional open surgery is always necessary for this type of disease. Early studies showed that patients in whom intestinal resection was necessary in order to achieve maximal possible cytoreduction did not fare as well as those patients in whom bowel resection was unnecessary. Their study demonstrated that it was possible to carry out maximal cytoreductive surgery and achieve optimal resection by employing techniques including posterior exenteration with anterior resection of the rectum, resection of the small bowel, stripping of the diaphragm, retroperitoneal node dissection and ablation of remaining peritoneal implants. A good overall median survival could be achieved (48 months) with a 47% 5-year survival. This was the first study to show by multivariate analysis that the most significant factor for survival was whether cytoreductive surgery led to zero residual disease. Other significant factors include age, the volume of ascites present if any, stage of disease, i. More recent studies have confirmed that optimal, complete tumour surgical resection has a beneficial effect on survival and also response to chemotherapy. This indicated that interval debulking as a planned second surgical procedure after three courses of neoadjuvant chemotherapy and sub-optimal primary surgery had a major impact on survival. Secondary debulking after an initial sub-optimal procedure significantly lengthened the progression free and overall survival rate, reducing the risk of death by 1/3. The intention therefore is to increase the possibility of carrying out maximal tumour reduction, to make the surgery easier thereby reducing operative morbidity. Initially, primary chemotherapy was used in the treatment of elderly patients in relatively poor medical condition rather than submitting them to an aggressive surgical procedure. A later and larger series has shown that neoadjuvant chemotherapy followed by delayed primary surgery is not inferior to primary surgery followed by adjuvant chemotherapy. If the disease has spread through into the diaphragmatic muscle, on occasion this may also be resected. The diaphragm may be closed with interrupted number 1 vicryl sutures having inserted a drain and ensuring adequate re-expansion of the lung. This approach allows an accurate staging even if blind biopsies have been necessary with no obvious involvement of tumour outside the ovaries. Thorough and extensive resection will have an impact on the success of adjuvant chemotherapy and determine whether early stage tumours require further treatment or not. If patients are symptomatic with progressive intestinal obstruction or acute pain then surgical re-exploration is clearly indicated. Most patients with progressive disease will develop some form of intestinal obstruction. The majority will have incomplete intestinal obstruction with diffuse serosal disease. If this is unremitting and not responding to conservative medical management and dietary control, surgery should be considered, as substantial palliation may be achieved. Criteria for selection are difficult to define but progressive obstructive symptoms with a risk of perforation clearly warrant surgical intervention. A single site of obstruction may be resected but on some occasions a stoma may be necessary for faecal diversion. The most frequent sites for obstruction to occur are the distal small intestine, i. Such intervention will allow a significant number of patients to resume a normal or low-residue diet. Most patients will present with advanced disease and a considered decision has to be taken as to how they should be treated, whether by neoadjuvant chemotherapy or primary surgery. When surgery is contemplated, careful assessment and pre-operative preparation is essential to minimise morbidity and indeed mortality. Age as well as performance status play a significant role in determining prognosis and survival. Death prior to hospital discharge and within 60 days of surgery has a higher incidence than in younger patients, and many do not fulfil planned treatment with adjunctive chemotherapy. When surgery is decided upon, the intention and aims of surgery must be carefully defined and planned by an experienced surgeon and anaesthetist, so that the shortest, safest and most appropriate procedure can be performed. Postoperatively, careful monitoring and supervision on a critical care ward will be necessary. The planned surgical procedure will depend not only on the frailty of the patient but also the extent of the disease and the operability of the tumour.
The edges of adjacent type I pneumocytes are tightly bound together weight loss vegan diet cheap 120 mg xenical amex, providing an intact epithelial barrier weight loss pills comparison buy xenical discount. The cytoplasm of type I pneumocytes contains a few mitochondria weight loss with yoga cheap 60mg xenical with amex, a small amount of smooth endoplasmic reticulum weight loss pills hypothyroidism xenical 60 mg cheap, and an occasional lysozyme. Micropinocytic vesicles (caveoli), which probably play a major role in transport of solutes through the cell, are seen in the plasmalemma. This tight barrier helps Acini and alveoli Terminal bronchioles constitute the most distal part of the conducting portion of the respiratory tract. The acinus lies beyond the terminal bronchiole and comprises respiratory bronchioles, alveolar ducts, alveolar sacs, and alveoli, which are all involved in gas exchange. The respiratory bronchiole is the first order of bronchiole to bear alveoli, the number of which progressively increases with subsequent branches. The respiratory bronchioles are lined by ciliated cuboidal cells and non-ciliated Club cells, although the number of ciliated cells progressively diminishes distally. Each alveolus is lined by an epithelium, which is inconspicuous by light microscopy in a normal lung (Figure 37). It is 24 Chapter 1: the normal lung: histology, embryology, development, aging and function (a) (b) Figure 38. At the top there is the thin attenuated cytoplasm of a type I cell with basement membrane beneath. Type I cell deep cytoplasmic extensions pass through the alveolar wall interstitium between capillaries to reach and cover parts of the opposing alveolar surface. The major function of type I pneumocytes is to allow gas exchange and fluid transport. Lung epithelium has enormous flexibility to alter the magnitude of salt and water transport. These cuboidal cells, with a diameter of 8:10 mm, have large, central, round nuclei with dispersed chromatin, prominent nucleoli and plentiful eosinophilic, vacuolated cytoplasm. The cytoplasm contains numerous mitochondria, rough endoplasmic reticulum, and many lysosomes. The characteristic feature is the presence of osmiophilic lamellar bodies, responsible for surfactant production. The lamellar bodies are membrane-bound structures and the lamellae are mainly composed of phospholipids (Figure 39). They also proliferate to restore the epithelium after lung injury and differentiate into type I pneumocytes. Surfactant reduces 25 Chapter 1: the normal lung: histology, embryology, development, aging and function Figure 39. It acts in a similar way to a patch of oil on a road, so water aggregates into globules which are removed by lymphatics. Surfactant also has the important function of keeping airways open by maintaining bronchiolar patency during normal and forced respiration. When surfactant is absent, as in bronchopulmonary dysplasia, or lost, as in acute respiratory distress syndrome, small airways and alveolar walls collapse (see Chapter 3). Obstructed bronchial segment(s), an increase in lung volume, increased surface tension, hypocapnia, decreased pulmonary blood flow, and pulmonary edema may affect collateral pathways. The interstitial space is formed by extracellular matrix and a variable number of cells. Pulmonary gas exchange critically depends upon the hydration state and the thinness of the interstitial tissue layer within the alveolar-capillary barrier. The entire lung is invested with a continuous connective tissue framework from the hilum to the visceral pleura and involves the interstitial space, which contains mainly collagen and elastin fibers. This means that any force exerted on the parenchyma is distributed throughout the organ. Where the alveolar epithelium covers capillaries, the two basement membranes fuse to form a homogeneous structure. The portion of each membrane subjacent to both the alveolar and capillary endothelium is less dense and is termed the lamina lucida. In the interstitium, fluid freely moving within the fibrous extracellular matrix equilibrates with water interacting with hyaluronic acid and proteoglycans. The interstitium establishes and maintains adequate interstitial tissue fluid volume by providing a stiff three-dimensional fibrous scaffold. It functions as an efficient safety factor to oppose fluid filtration into the tissue and prevent tissue fluid accumulation. Disturbances of the deposition and/or turnover of the matrix and/or of its three-dimensional architecture and composition may evolve into pulmonary fibrosis. In pulmonary edema and lung injury, this space becomes thicker, thus impeding gaseous exchange. In acute lung injury, if edema does not resolve, interstitial pulmonary fibrosis follows. Alveolar macrophages, derived from blood monocytes, are an important component of the lung defense mechanism against inhaled particulate materials, microorganisms, and environmental toxins which escape the upper airway defense system. Alveolar macrophages vary in size from 12 to 40 mm in diameter and have a lobulated nucleus. The cytoplasm usually contains abundant particulate matter, a large proportion of which is black, due to carbon, often called anthracotic pigment. Macrophages containing phagocytosed material from cigarette smoke are often seen in the alveoli of smokers. Macrophages sequestered in the interstitium are removed by lymphatics to the draining lymph nodes. Those in alveoli mostly migrate into the upper airways, where they are removed by the mucociliary system.
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