By O. Kurt. Point Park University. 2018.
Inflammatory conditions of the lung may involve the pleura and cause pleuritic chest pain duetact 16 mg low cost, which characteristically worsens on breathing in and out cheap duetact 17 mg with visa. Cyanosis: this is the presence of more than 5g/dL of deoxygenated haemoglobin in the blood purchase duetact 17 mg without prescription. Central cyanosis can be caused by any lung Evaluating respiratory disease 81 Handbook of Critical Care Medicine condition which causes severe hypoxia, or by cardiac right to left shunts. Peripheral cyanosis is caused by conditions which slow the peripheral circulation resulting in increased extraction of oxygen from haemoglobin – vasoconstriction, low cardiac output states. Clubbing: clubbing is seen in squamous cell bronchial carcinoma, suppurative lung disease (bronchiectasis, lung abscess, empyema), fibrosing alveolitis, and congenital or acquired cyanotic heart diseases (where a right- to-left shunt is present). Examination of the chest: The standard examination of the chest will reveal conditions such as pleural effusions, pneumothorax, localised consolidation, basal fibrosis, bronchiectasis etc. Investigations Chest radiograph An essential investigation in diagnosing respiratory disease. Because of this, it is prudent to be careful when interpreting subtle and minor radiological appearances which could be artefactual. It is mandatory that the person who did the procedure checks the chest radiograph. Always look carefully at the margins of the lung fields for air in the pleural space. PaO2 The partial pressure of oxygen determines the degree of oxygen saturation of haemoglobin (SaO ). The arterial oxygen content is dependent on the2 oxygen saturation and the haemoglobin. Thus the arterial oxygen content is determined by the following formula: Arterial O content = (SaO x Hb x 1. A small2 2 fall in PaO will not drop the SaO much, and hence, will not affect arterial2 2 oxygen content. Oxygen delivery to the tissues is dependent on the arterial oxygen content and the cardiac output. If the blood pressure is low, even though the arterial oxygen content is adequate, tissue oxygen delivery will be low. If oxygen utilisation in the tissues exceeds oxygen delivery, the cells revert to anaerobic metabolism, leading to lactic acidosis. The pulse oxymeter measures phasic changes in the intensity of transmitted light – hence, it works only with pulsating arteries, thus eliminating possible errors created by light reflection from other tissues. Pulse oxymetry can be affected by low perfusion states, skin pigmentation, nail polish, and its accuracy is poor when the saturation drops below 83%. Much information can be2 determined by analysis of the capnograph curve, which is beyond the scope of this book. Ultrasound scanning of the chest This is used mainly for chest tube placement, and to look at pleural pathologies. It is sometimes useful to identify tumours or masses within a collection of fluid in the chest. Ventilation-perfusion scans Used primarily to diagnose or exclude pulmonary embolism. Bronchoscopy Used to visual the tracheobronchial tree, and also to obtain specimens for cytology and culture. Airway Management The first step in resuscitation is management of the airway, x Airway patency- remove any obstructions and clear secretions. Most of the time, neck extension alone will open the airway – sometimes the triple airway manoeuvre is necessary – head tilt, chin lift and jaw thrust. If airway patency cannot be quickly established, an emergency tracheostomy must be performed. Once the airway has been established, an oropharyngeal airway should be used to keep the airway open. The oropharyngeal airway should be inserted with the convex side towards the tongue and then rotated through 180 Evaluating respiratory disease 85 Handbook of Critical Care Medicine degrees. If the patient is not breathing adequately spontaneously, bag and mask ventilation must be performed. Evaluating respiratory disease 86 Handbook of Critical Care Medicine Preparation The following equipment is essential x Laryngoscopes – several sizes. Pre-oxygenation the patient with 100% oxygen for at least 5 minutes Sedation and paralysis Administer an intravenous induction agent. It can cause hyperkalaemia, and the patient’s serum potassium should be checked before its use. It can also cause cardiac arrhythmias, increased intracranial pressure, and increased intraocular pressure. Certain patients may have a genetic defect in the plasma pseudocholinesterase genes; these patients may Evaluating respiratory disease 87 Handbook of Critical Care Medicine have prolonged neuromuscular paralysis with suxamethonium. Plasma cholinesterase activity may also be reduced by burns, decompensated heart disease, infections, malignant tumors, myxedema, pregnancy and severe hepatic or renal dysfunction. Push the tongue to the left and direct the tip of the blade into the midline and into the vallecula between the epiglottis and the base of the tongue. Abnormal placement sites are: o Tip in the right or left bronchus o Tip at the level of the vocal cords with the cuff above the cords. However, if signs of imminent respiratory arrest are present, there should be no delay in ventilating the patient, either invasively, or if available, non-invasively. Assessment Emergency management of asthma must take place before a full detailed assessment of the patient is performed. The patient has usually been on bronchodilators for a few days; hence, the bronchospasm is not that severe. However, the inflammatory process is worsening, and mucosal oedema and secretions are responsible for bronchial obstruction. Clinical deterioration in spite of optimal therapy, with increasing use of bronchodilators, is also a poor prognostic factor. Blood gas analysis is very helpful in determining progress and the need for preparing for ventilation. Hypoxia also indicates impending respiratory failure and the need for ventilation. In asthma, inflammatory changes in the airways lead to airway narrowing and resultant increase in resistance of the small airways. This is caused by bronchospasm as well as mucosal oedema and secretions, and results in dynamic hyperinflation of the lung. Dynamic hyperinflation occurs when the expiratory time is not sufficient to allow full expiration. Loss of elasticity and emphysematous changes result in airway collapse, resulting in air trapping. Some element of air trapping can also occur in asthma by mucosal plugs blocking the airways. Apart from airway narrowing, emphysematous changes also contribute to airflow limitation. The result of loss of elasticity causes the small airways to collapse, and also affects elastic recoil of the lung during expiration.
In the closing years of the 19th century Kraepelin viewed schizophrenia as a disorder which always carried a poor prognosis cheap 17 mg duetact otc. In the 1960s Brown and others found that after five years 56% of discharged schizophrenics made a social recovery buy duetact 16mg, 35% were socially damaged but lived outside hospital discount 17 mg duetact otc, and only 11% had spent all their time in hospital. Bland and Orn (1978) found that after fourteen years about half were coping well with minimal disability, one-quarter had moderate to marked disability and a further quarter were disabled psychiatrically, socially and occupationally. Manfred Bleuler (in 1974, lived 1903-94) followed up 208 patients for over twenty years and found that there was usually no further deterioration after five years; in fact, some even improved. Also, there have been reports of a relatively good outcome for schizophrenia in some industrialised societies (Prague, Nottingham) and of a poor outcome in Cali. Three- year outcomes were similar to that of affective psychosis and significantly superior to that of schizophrenia. Also, in non-affective psychotic disorders, being a woman and having good premorbid function, but not acute onset or early remission, predicts favourable outcome at three years. Sikanerty and Eaton (1984) reported a lower prevalence for schizophrenia in the Third World. There are also reports from developing countries of symptomatic, severely disabled chronic, untreated patients living with extended families. Even the best studies fail to predict more than one-quarter of the variation in subsequent course. Wing and Brown (1970) looked at the long-stay schizophrenic patients of three different hospitals. The hospitals with the most barren, understimulating wards had the most withdrawn, silent and affectively blunted cases. While this was not borne out by a cross-sectional study conducted by Eyler Zorrilla ea (2000) it received support from a study showing an increased risk of developing dementia compared to patients with osteoarthritis and to the general population. However, more recent studies suggest that elderly schizophrenics remain symptomatic and impaired. Poor social functioning at the start of the study predicted a poor symptomatic outcome. Fifty-two percent had no psychiatric symptoms in the previous two years, 52% had no negative symptoms, 55% had good to fair social functioning, and only 17% were fully well, symptomless, and off treatment. The same authors later reported that the course may be stormiest at the start but tends to plateau later, with no progression or alleviation in the long run. Finnerty ea(2002) were able to follow up only 37 of 67 (55%) first episode schizophrenic patients over 15 years: 43% (of the 55%) were more or less continuously psychotic, a similar percentage suffered recurrent episodes of their disorder, two out of three had moderate to severe symptoms for most of the time, over four-fifths were unemployed, and there had been eight deaths (6 male and 2 female; 5 suicides or 11% of the 55%; 3 from natural causes), the excess mortality being due to male deaths. While Healy ea (2006) reported a rise in the suicide rate associated with schizophrenia, Danish workers reported a fall. This might be due to dopamine blockade by oestrogens; and higher blood oestrogen levels in schizophrenic women are associated with better cognitive ability. Over 50% of schizophrenic patients will relapse during the first 9 months after stopping medication (compared to 16% in those remaining on 1175 medication), the great majority will have done so after 2 years. The schizophrenics had about twice the overall mortality of the general population. The suicide mortality was about ten times higher among male patients and eighteen times higher among female patients than in the general population. Females with schizophrenia may be more suicide-prone if single and living alone, or if depressed. Other work from Sweden and England has confirmed the increased mortality in schizophrenia from all causes, including suicide, cardiovascular disease, digestive disorders, endocrine conditions, nervous and respiratory diseases, undetermined causes and violence. Heavy smoking, poor diet, lack of exercise and obesity must be important in these cases. A recent systematic review (Hawton ea, 2005) found that risk of suicide in people with schizophrenia is strongly associated with depression, previous suicide attempts, substance misuse, agitation/motor restlessness, fear of mental disintegration, poor treatment adherence, and recent loss, and less so with active psychotic features. Suicide and accidents, together with other causes of death, account for an increased mortality rate in schizophrenia. Although suicide is an important cause of death in schizophrenia, the main source of excess mortality derives from natural causes,(Casey & Hansen, 2003, p. However, the retrospective nature of most research suggests that diabetes may be intrinsic to schizophrenia and unravelling the differential role of different antipsychotic drugs requires prospective research. Saarni ea (2009), in a Finnish study, found that people with schizophrenia had an excess of abdominal obesity, high fat percentage, and low muscle mass. Jaspers’ writings about reactive psychosis describe massive stressors , a relationship in time between stress and psychosis, a benign course, content of psychosis often reflecting the nature of traumatic experience, and the possibility that psychosis acts as an escape route. Good prognosis is associated with high premorbid functioning, few premorbid schizoid traits, severe precipitating stressors, sudden onset, affective symptoms, confusion and perplexity, little affective blunting, short duration, and no schizophrenic relatives. Sudden onset of agitation, aggression, excitement, and confusion characterise his condition. Management usually involves admission to hospital since patients are usually floridly psychotic. Continued treatment may be needed in recurrent cases (or in those cases that persist beyond this diagnostic compartment). Many psychiatrists would now view paraphrenia as simply schizophrenia of later onset. Indeed, Brodaty ea (1999) failed to distinguish early v late (> 50 years) schizophrenia on any grounds. This is a controversial diagnosis,(Munro, 1999) being diagnosed if onset is over 60 years of age. Late paraphrenia is associated with a wide range of delusions, usually persecutory or referential, hallucinations (usually auditory), and with no catatonia or inappropriate affect, and very rarely is there any formal thought disorder, all of might suggest that its inclusion under other diagnoses is unwarranted. O’Shea, 1997) It is particularly associated with socially isolated, deaf females who show an excess of soft neurological signs. In general, paranoid symptoms in the elderly are associated with cognitive impairment and social isolation. Almeida (1998) does not accept that late paraphrenia should have ‘disappeared’ the way it did and does not believe that the excess of females is simply due to late-onset schizophrenia in women. Almeida sees aetiology in this case as an interaction involving age, female sex, social isolation, hearing (mainly conductive) impairment, subtle brain lesions and cognitive decline. Almeida divides late paraphrenia into functional (many psychiatric symptoms including first rank one, and cognitive deficits confined to the executive sphere) and organic (generalised cognitive decline and an excess of neurological signs) types. However, if they last for > 1 day but < 1 month they are diagnosed as brief psychotic disorder + (whatever) personality disorder. The patient sees a single persecutor, who usually ‘follows’ the patient about the place, as having many disguises, i. Both the Capgras and Fregoli phenomena are actually delusions and not illusions, the latter term being misused in this case. Zombi phenomenon: A Zombi is a person who is raised in a comatose trance from the grave and forced to toil as a slave. Alternative explanations have included the use of potions by the Haitian voudoun priests (tetrodotoxins - potent neurotoxins from certain species of puffer fish) and neurosyphilis. However, it should be noted that it can be very difficult to decide if a patient is actually deluded in such cases, the intensity of belief varying between patients and in the same patient.
Wall motion Visual assessment of cinematic display or analysis of phase and amplitude images buy 17mg duetact with visa. Principle Myocardial perfusion scintigraphy uses perfusion radiotracers that are distributed in the myocardium (primarily the left ventricle) in proportion to coronary blood flow buy duetact 16mg line. Areas of normal flow exhibit a relatively high level of tracer uptake cheap duetact 16 mg without a prescription, while ischaemic regions present a relatively low uptake. Regional coronary blood flow may be compared in conditions of rest, stress or pharmacologically induced vasodilation. In addition to evaluating relative regional blood flow these tracers are, therefore, also markers of myocardial viability. Myocardial perfusion scintigraphy may be performed using either single photon or positron emitting radionuclides. Among the commonly used single photon emitting 201 99m perfusion tracers are Tl and the various Tc labelled perfusion tracers (e. While having different physical and pharmaco- kinetic properties, these tracers have considerably overlapping clinical uses and will therefore be considered in parallel in this section. Clinical indications The clinical indications for myocardial perfusion tomography are summarized in Table 5. The presence of extensive ischaemia or myocardium at risk indicates the need for more invasive work-up, such as coronary angiography. Conversely, the absence of significant ischaemia or myocardium at risk generally rules out the need for intervention. Myocardial perfusion imaging can be performed in various settings: in patients with suspected coronary artery disease, after myocardial infarction or for the assessment of therapy. Myocardial perfusion imaging can also be used to evaluate the patho- logical significance of coronary lesions already detected by angiography. Angiographic coronary artery disease with a normal stress myocardial perfusion scan has little prognostic significance according to accumulated data. This helps clinicians to determine which patients to manage aggressively with invasive procedures and which ones to manage conservatively. As with detecting myocardium at risk, stratification using mycardial perfusion imaging can be done in various settings: in patients with suspected coronary artery disease, after myocardial infarction as well as before non- cardiac surgery (to determine the risk of perioperative cardiac events). The term ‘viable myocardium’, in its broadest sense, denotes any myocardium that is not infarcted. For the cardiologist, however, the search for myocardial viability is primarily a quest for myocardial hibernation. Myocardial hibernation is classically defined as chronic hypoperfusion and dysfunction that reverses after revascularization. It can be distinguished from myocardial stunning, which denotes acute but transient hypoperfusion and dysfunction, typically after a myocardial infarction in adjacent tissue that does not require intervention because it recovers spontaneously. It is now accepted, however, that the line separating hibernation from stunning is not as clear as was once thought. Various modifications to basic myocardial perfusion imaging protocols have been devised in order to distinguish hibernating, viable myocardium from non-viable, infarcted myocardium. These include late redistribution, re- injection imaging (both protocols using 201Tl) and nitrate augmented rest 201 99m imaging (using either Tl or Tc labelled agents). This may then be evaluated qualitatively by viewing the images in an endless loop cine-display, or quantitatively using commercially available software. The presence of global dilatation, thinned out walls, ventricular aneurysms and increased lung uptake are all suggestive of left ventricular failure. Radiopharmaceuticals A number of single photon emitting radiopharmaceuticals may be used for imaging myocardial perfusion. The three most commonly used at present are 201Tl and the 99mTc labelled tracers sestamibi and tetrofosmin. Thallium-201 also has gamma rays of 135 and 167 keV, which contribute little to the total image counts. The extraction fraction is linearly proportional to blood flow over a wide range of physiological flow levels, plateauing only at very high flow rates and logarithmically decreasing towards the very low flow range. Relative accumulation in the myocardium thus reflects relative regional perfusion. This radiotracer is characterized by redistribution in the myocardium, settling in equilibrium between the myocardial and blood pool concentrations. This makes 201Tl a marker of myocardial viability, which is perhaps its greatest advantage. Disadvantages Relatively long High hepatobiliary — half-life limits activity needs delay allowable dose. Protocols employing 99mTc-sestamibi involve post-injection waiting times of 45–90 min, to allow for adequate clearance of subdiaphragmatic activity. Technetium-99m-sestamibi is characterized by a minimal yet discernible amount of redistribution, which may sometimes be used as a marker of recoverable myocardium. Its main advantages are ease of preparation and faster hepatic clearance, allowing shorter post-injection waiting times of 20–30 min. Equipment (a) Cameras A single-crystal gamma camera is the basic piece of equipment required for myocardial perfusion imaging using both 201Tl and 99mTc agents. Planar imaging is not considered optimal for myocardial perfusion due to its lower sensitivity. Acquiring images in a single, symmetric energy window is adequate, although an asymmetric window as well as multiple window capability allow minimization and correction of scattered radiation. Many current gamma cameras provide an option for non-uniform attenuation correction using an attenuation map acquired with a transmission source. It is probable that transmission attenuation correction will become the standard technique in the future. With caution and experience, however, most attenuation artefacts can be identified even without special techniques or manoeuvres. For accuracy, there is still no substitute for a trained and experienced human operator. Nonetheless, automated drawings always require human verification, especially in cases of ventricles with extensive and severe perfusion defects. An effective quality control program should be strictly observed for myocardial perfusion imaging. Any error in the acquired image resulting from a failure of quality control will be magnified many times upon tomographic reconstruction. Pharmacological stress modalities should be selected for patients who are unable to perform upright leg exercise. A common protocol for treadmill exercise is the Bruce protocol with symptom limited stress.
Medicine has become a synonym for health when it can do little m ore than m odulate hum an suffering discount 16mg duetact free shipping. Al though estimates vary duetact 16 mg online, well over one-half of those who seek physician’s services do not have medical disorders duetact 16mg line. Rather, they are afflicted by disorders o f the spirit bred by the suffering and anguish that accompany life. Neverthe less, medicine has fostered a profoundly dependent public which searches for cures that do not exist. It has a complacent administrative style and a large, cumbersome and self-serving regulatory mechanism that does not encourage or even accommodate change. But despite their control o f hospitals, few physicians have entered into formal arrangem ents with hos pitals; they are usually treated as independent contractors. Occasionally, o f course, doctors and hospitals join to provide services, but in such cases there is no powerful centripetal force. T he result is that the industry has rem ained both labor intensive and highly fragm ented, despite rapid technological advances. And the physicians, who have the power to tie things together, function indepen- Organization, Practice, and Style 39 dently of one another, relying on inform al communication ^ and referral practices. T he more than 7000 hospitals in the United States differ greatly in size and technical capacity. Regardless of size, each possesses only two basic ways to deal with patients—they are either placed in a bed or treated as outpatients. Physi cians and consumers alike tend to think o f and use hospitals for the care of acute conditions requiring immobilization, and for chronically ill patients who are often housed in hospitals because there are few other places to put them. Moreover, many patients, particularly when someone else is paying, prefer the attention they get while in a bed to standing around unnoticed in the outpatient departm ent. Hospitals and other facilities for care rarely reflect the fact that patients’ conditions range along a continuum from well-being to mortality; not every condition can be classified as insubstantial or acute. Four interrelated problems affect the distribution of medical care resources in the United States: the location of resources, patients’ ability to pay for medical care, patient access to care, and specializa tion of physicians. First, medical care resources are spatially m aldistributed along two dimensions: rich/poor and urban/rural. T he more affluent states average 160 practicing physicians per 100,000 people, almost double the rate o f 87 physicians per 100,000 in the less affluent states. T he fact that the poor average as many visits to the doctor as the nonpoor is only testimony to their per sistence. Many of the poor and near poor in this country lack care because they cannot pay for it. Since Medicaid only aids those who are am ong the poorest, many low-income families are without care, no m atter where they live. Although many physicians continue in the tradition o f treating patients who cannot pay, Medicaid undercuts the physician’s incentive to provide charity care. T he Medicaid program at tacked the consum er’s purchasing power problem by aug m enting the capacity o f the poor to pay, but stopped short in two crucial respects. First, it does not cover all the health needs o f those eligible for its support; second, it aids only the very poor. T he patient access problem, although closely related to it, is more complex than the problem of the geographic dis tribution of physicians. T he local availability o f physicians is, of course, a necessary precondition to access. But many persons residing in areas that provide medical care resources still do not have access to care, because they do not know where to go or what to do. Today many persons do not know a healer of general com petence, or even anyone to advise them where to go or what to do. More than 50 percent o f patient visits to emergency rooms do not involve emergencies; people go there because they do not know where else to go. Recent studies have pegged the level of nonem ergency use o f emergency rooms even higher—in one case at 90 percent. In one study, Organization, Practice, and Style 41 the percentage o f nonem ergency visits rose from 45. T he fourth problem—the distribution of physicians by specialty—has a significant effect on overall distribution, since the type of medical care available may be as im portant as the overall quality of services available. In 1970, the American Medical Association formally recognized 29 new specialties, which brought the total to 63. At present, roughly 55 percent of all physicians in the United States deal with prim ary care (general practitioners, internists, obstetri cians, and pediatricians). Specialists need to practice where the population is concentrated to insure a sufficient num ber of patients for their services. In sum, then, the m aldistribution of medical care re sources is a com pound o f too few health care resources in sparsely populated areas, too few health care resources in heavily populated urban/poor areas, constraints on access to care in both rural and urban areas because o f consum ers’ inability to pay, and the lack of access to prim ary care prac titioners, assuming the presence o f such practitioners. And all o f these problems are in turn com pounded by the in creasing specialization of physicians. A predom inant characteristic of the medical care system is the pervasive role played by profes sional societies and associations of providers. More than 100,000 individual “firms” of profession als render care to a bewildered public. T he system is form i dable and confusing at the point of entry, swathed in mys tique during the treatm ent process, and aloof and obdurate about its results. We pay an enorm ous price to perpetuate the system, most o f which goes to the salaries of highly paid professionals and the amortization of the mortgages on our hospitals. We let the professionals allocate resources and determ ine the distribution o f facilities. And, to a large extent, the num ber o f hospital beds is constrained only by the limits of capital and imagination. Practice, and Style •43 judge the system’s product—physicians insist on the right to m onitor the perform ance of the system by standards of their own making. The behavior o f the existing medical care system is inti mately related to prerogatives o f professionals. Thus, questions about efficacy are met with disdain; it is the province o f professionals to make independent judgm ents. Freidson argues that the “prim e reason for the failure to communicate with the patient does not lie in underfinancing, understaffing or bureaucratiza tion. R ather it lies in the professional organization of the hospital and in the professional’s concept of his relation to his clients. Medical professionals in particular, since they em phasize that the im portance of what they do is not to be questioned, argue that the cost of what they do is similarly not to be questioned. Physicians make nearly all o f the work rules by which other personnel within the medical care system are gov erned.
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