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By: H. Campa, M.A., Ph.D.
Program Director, Ponce School of Medicine
All the photomicrographs included in the present edition have been exposed afresh which has been made possible by the most valuable and selfless assistance rendered by my colleagues skin care lab order 30 gm acticin with amex, Drs Shailja acne nyc generic acticin 30gm with mastercard, Tanvi and Ujjawal acne 2017 buy discount acticin 30gm online, Senior Residents in Pathology acne routine cheap acticin, all of whom worked tirelessly for endless hours for months, much to the sacrifice of their personal comfort and time of their families, for which I am indebted to them. Here, I also recall the help accorded by my former students and colleagues in preparation of earlier editions of the book and thank once again, even though much of that may have been replaced. Constant strategic support and encouragement extended by the Department of Medical Education and Research, Chandigarh Administration, during the completion of work is gratefully acknowledged. I may have been hard-task master and highly demanding on quality and accuracy from all staff members of the M/s Jaypee Brothers Medical Publishers (P) Ltd, at times losing my patience, but all of them have been very cooperative and quite accommodating. All through this period, Mr Tarun Duneja, (Director-Publishing), M/s Jaypee Brothers Medical Publishers (P) Ltd, has been highly cooperative and supportive. Full credit goes to M/s Ajanta Printers, Faridabad, for the admirably high quality of printing. Finally, the users of previous editions are gratefully acknowledged for having brought this textbook at this pedestal. In the past, I have gained profitably by suggestions from colleagues and students and I urge them to continue giving their valuable suggestions and point out errors, if any, so that I may continue to improve it. While disease suggests an entity with a cause, illness is the reaction of the individual to disease in the form of symptoms (complaints of the patient) and physical signs (elicited by the clinician). Though disease and illness are not separable, the study of diseases is done in pathology while the learning and management of illnesses is done in wards and clinics. In addition to disease and illness, there are syndromes (meaning running together) characterised by combination of symptoms caused by altered physiologic processes. Lesions are the characteristic changes in tissues and cells produced by disease in an individual or experimental animal. Pathologic changes can be recognised with the naked eye (gross or macroscopic changes) or studied by microscopic examination of tissues. Causal factors responsible for the lesions are included in etiology of disease. Functional implications of the lesion felt by the patient are symptoms and those discovered by the clinician are the physical signs. Clinical significance of the morphologic and functional changes together with results of other investigations help to arrive at an answer to what is wrong (diagnosis), what is going to happen (prognosis), what can be done about it (treatment), and finally what should be done to avoid complications and spread (prevention). Pathology is, thus, scientific study of structure and function of the body in disease; or in other words, pathology consists of the abnormalities that occur in normal anatomy (including histology) and physiology owing to disease. Pathophysiology, thus, includes study of disordered function or breakdown of homeostasis in diseases. Therefore, knowledge and understanding of pathology is essential for all would-be doctors, general medical practitioners and specialists since unless they know the causes, mechanisms, nature and type of disease, and understand the language spoken by the pathologist in the form of laboratory reports, they would not be able to institute appropriate treatment or suggest preventive measures to the patient. For the student of any system of medicine, the discipline of pathology forms a vital bridge between initial learning phase of preclinical sciences and the final phase of clinical subjects. Remember the prophetic words of one of the eminent founders of modern medicine in late 19th and early 20th century, Sir William Osler, "Your practice of medicine will be as good as your understanding of pathology. Health may be defined as a condition when the individual is in complete accord with the surroundings, while disease is loss of ease (or comfort) to the body. It also needs to be appreciated that at cellular level, the cells display wide range of activities within the broad area of health similar to what is seen in diseased cells. Since the beginning of 2 mankind, there has been desire as well as need to know more about the causes, mechanisms and nature of diseases. The answers to these questions have evolved over the centuries- from supernatural beliefs to the present state of our knowledge of modern pathology. However, pathology is not separable from other multiple disciplines of medicine and owes its development to interaction and interdependence on advances in diverse neighbouring branches of science, in addition to the strides made in medical technology. As we shall see in the pages that follow, pathology has evolved over the years as a distinct discipline from anatomy, medicine and surgery, in that sequence. The brief review of fascinating history of pathology and its many magnificent personalities with their outstanding contribution in the opening pages of the book is meant to pay our obeisance to those great personalities who have laid glorious foundations of our speciality.
- Launois Bensaude adenolipomatosis
- Vaginiosis (bacterial, cytologic)
- Tremor hereditary essential
- Rhabdomyomatous dysplasia cardiopathy genital anomalies
- Congenital cardiovascular disorder
- Reactive attachment disorder (RAD)
They are classified according to their range of effectiveness and the general microbial group they act against skin care 777 generic 30gm acticin with amex, i acne 70 order 30gm acticin visa. The range of bacteria or other microorganisms affected by a specific antibiotic is expressed as its spectrum of action acne marks discount acticin 30 gm. Antibiotics effective against a wide range of Gram-positive and Gramnegative bacteria are said to be broad spectrum skin care not tested on animals quality acticin 30gm. If they are predominantly effective against Gram-positive or Gram-negative bacteria, they are narrow spectrum; and limited spectrum antibiotics are effective against only a single organism or disease. Antibiotics are low molecular weight compounds that are produced as secondary metabolites by mainly soil microorganisms. Also, there is thought to be a relationship, besides temporal, between antibiotic production and the processes of sporulation (see Chapter 3, Secondary metabolism). Among the filamentous fungi, the notable antibiotic producers are Penicillium and Cephalosporium (Acremonium), which are the main source of b-lactam antibiotics. Within the bacteria, the filamentous actinomycetes, especially many Streptomyces species, produce a variety of antibiotics, including aminoglycosides, macrolides and tetracyclines. Endospore-forming Bacillus species and relatives produce polypeptide antibiotics, such as polymyxin and bacitracin. Inhibition of cell wall synthesis Inhibitors of bacterial cell wall/envelope synthesis generally target some step in the formation of peptidoglycan. The b-lactam antibiotics, penicillins and cephalosporins, are the best known examples. Most penicillins are derivatives of 6-aminopenicillanic acid and like all b-lactam antibiotics contain a blactam ring, which is essential for activity. The side chains attached may provide other characteristics, including resistance to enzymic degradation and the mechanism of cell wall penetration. Major differences are the absence of cell walls in animal cells; the size of their ribosomes, except mitochondrial ribosomes; and specific details of metabolism. However, a broader definition of an antibiotic includes natural chemical products from any type of cell that kill or inhibit the growth of other cells. Some antibiotics can now be completely chemically synthesized or natural antibiotics may be chemically modified to improve their properties (see Chapter 11). Some are analogues of purine and pyrimidine bases that become incorporated into nucleic acids, but are unable to form functional base pairs. The sulphonamides were the first compounds found to suppress bacterial infections selectively. Folic acid also functions as a coenzyme for the synthesis of purine and pyrimidine bases of nucleic acids. Selectivity is provided as animal cells do not synthesize their own folic acid: they must obtain the preformed vitamin from their diet. Quinolones, such as nalidixic acid, are synthetic chemotherapeutic agents that are bacteriocidal, killing mainly Gram-negative bacteria. Also, penicillin G is unstable in acid conditions, therefore oral administration is ineffective due to the low pH within the stomach. In an effort to overcome these shortcomings, semisynthetic forms were developed with improved properties over natural penicillins. The main portion of the molecule, 6-aminopenicillanic acid, is produced by fermentation and is then chemically modified by the addition of various side chains (see Chapter 11). Improved properties exhibited by these semisynthetic penicillins include resistance to penicillinase, suitability for oral administration and increased spectrum of activity. Penicillins inhibit peptidoglycan synthesis and have no effect on established cell walls. Consequently, they are bactericidal to actively growing cells, which through the action of penicillin become sensitive to osmotic stress. The third step involves carboxypeptidases and transpeptidases in the final cross-linking between peptide side chains, to form a rigid matrix. Penicillins have a structural resemblance to the end dalanyl-d-alanine residues of the small peptides involved in the peptidoglycan cross-links. They covalently bind to transpeptidase via the b-lactam ring and prevent further functioning of the enzyme.
Then acne nose acticin 30gm for sale, being near rest position when deceleration occurs acne is a disorder associated with order acticin american express, it is deflected in the opposite direction by the inertial torque from the deceleration (angular acceleration in the opposite direction) skin care 30s generic acticin 30gm with mastercard. The turning sensation controlled by cupula deflection is accurate only during the initial acceleration acne 2nd trimester cheap acticin 30 gm. During constant velocity, the sensation of turn will diminish and stop; then, the deceleration will produce a reversed sensation of turning which can persist for 30 to 40 seconds after stopping. Obviously, with the unnatural stimulus, the semicircular canals do not perform their velocity-indicating function satisfactorily, and their input can be the basis of disorientation and impaired visual performance. Comparison of cupula deflection during a natural short turn (A) and during a sustained turn of several revolutions (B). During the initial acceleration in Figure 3-8B, the eyes drift right (relative to the skull) as the head turns left. This drift, which compensates approximately for the turn, is called the slow phase of nystagmus, but as the head continues to turn, the eyes "recenter" themselves, that is, catch up, by a fast or saccadic eye movement called the fast phase, which has extremely high velocity (300 to 600 degree/second). Because the directions of the slow and fast phase of nystagmus are opposite, there has been inconsistency in designation of the direction of nystagmus. When viewed by a medical examiner, the fast phase (saccade) is easiest to see, and this led to the convention of designating nystagmus direction by its fast phase relative to the examinee. To avoid confusion, it is best to specify slow or fast phase when nystagmus is described. As the head commences to turn left during the initial acceleration, the eyes drift right (slow phase), adequately compensating for the head velocity. With continued rotation, the eyes catch up, (fast phase) and then recommence drift. During the period of constant head velocity, slow-phase eye velocity, as it abates, would be less and less effective in assisting the eye to see Earth-fixed targets. During deceleration, the reversed direction of nystagmus and its persistence after stopping could only impair vision for either Earth-fixed or head-fixed targets. The nystagmus illustrated in Figure 3-9 approximates a typical response recorded in complete darkness. The nystagmus of a person with vision restricted to the interior of a rotating vehicle would be suppressed by any visible head-fixed display. With visual suppression, a maximum slow-phase velocity of about 14 degrees per second would occur (in other words, the visual/vestibular fixation index is about 0. This is sufficient to degrade visibility of fine detail on instruments briefly, until the suppressed vestibular nystagmus abates somewhat. The degradation is far less, however, than the total blurring of vision that would occur if the 100 degree/second slow-phase velocity were unsuppressed. Electronystagmogram of cupula deflection and eye movements during and after prolonged rotation. Measuring the slope of the angular displacement tracing during a slow phase gives the slow phase velocity of the eyes. Thus, vision for head-fixed targets will be very poor even though the peak head velocity may be only 15 to 20 deg. Individual differences in visual suppression of vestibular nystagmus in apparently healthy persons can be quite large. However, in many pathological states, especially peripheral vestibular- disorders, visual suppression is effective. For example, nystagmus attributable to reduced function in one ear (see Figure 3-3) will be visually suppressed, and it may not be detectable by direct observation. Alternatively, the physician may be able to detect nysagmus if he observes movement of the corneal bulge under the closed eyelid, of if the patient wears Fresnel lenses to blur vision. Visibility of Cockpit Instruments Loss of visibility of cockpit instruments has been indicated as a factor in disorientation in aviation (Melvill Jones, 1965; Tormes & Guedry, 1975). Malcolm and Money (1972) include inability to read flight instruments during vibration and turbulence as one of the conditions common to "Jet Upset Phenomenon," a situation in which pilots of large jet aircraft have gone into severe and disasterous nose-down attitudes to compensate for erroneous sensations of extreme nose-up attitudes (cf. Factors which may influence the visibility of flight instruments, separately and in combination, are the vestibulo-ocular reflex at high frequencies of head oscillation, poor visual system tracking with high-frequency instrument vibration relative to the head, the brightness and wavelength of light from the instruments, and the complexity of the 3-26 Vestibular Function instrument display. Further complications may be introduced by tendencies toward "grayout" from changing G-loads which may be exacerbated by vestibular stimuli (Melvill Jones, 1957; Sinha, 1968). Some maneuvers, such as several consecutive complete turns, can produce vestibuar aftereffects which tend to degrade vision due to nystagmus, while also disorienting the pilot. Despite good visual suppression of such effects, if maneuvers are sufficiently strong.
The upper dermis shows congested blood vessels and mononuclear inflammatory cell infiltrate acne dark spots generic acticin 30 gm amex, especially around the small blood vessels acne reddit purchase genuine acticin line. The epidermis shows moderate acanthosis and varying degree of parakeratosis in the horny layer with formation of surface crusts containing degenerated leucocytes acne quiz neutrogena buy acticin 30gm visa, bacteria and fibrin acne inversa images purchase 30gm acticin with mastercard. Chronic dermatitis shows hyperkeratosis, parakeratosis and acanthosis with elongation of the rete ridges and broadened dermal papillae. The upper dermis shows perivascular chronic inflammatory infiltrate and fibrosis. The most characteristic example of chronic dermatitis is lichen simplex chronicus. Hereditary angioneurotic oedema is an uncommon variant of urticaria in which there is recurrent oedema not only on the skin but also on the oral, laryngeal and gastrointestinal mucosa (page 97). The condition is either transmitted as autosomal dominant disorder or as a mutation. Histologically, the characteristic changes are hyperkeratosis, papillomatosis and dyskeratosis. Urticaria pigmentosa may occur as congenital form or may appear without any family history in the adolescents. Histologically, the epidermis is normal except for an increase in melanin pigmentation in the basal cell layer. An autosomal recessive disorder, ataxia appears in infancy, while telangiectasia appears in childhood. These children are more Erythema nodosum, acute or chronic, is the most 771 common form. The lesions consist of tender red nodules, 1-5 cm in diameter, seen more often on the anterior surface of the lower legs. Erythema nodosum is often found in association with bacterial or fungal infections, drug intake, inflammatory bowel disease and certain malignancies. The lesions are chronic, painless, slightly tender, recurrent and found on the calves of lower legs. Histologically, the early lesions show necrotising vasculitis involving the blood vessels in the deep dermis and subcutis. In chronic stage, there is inflammatory infiltrate consisting of lymphocytes, histiocytes and multinucleate giant cells. Acne vulgaris is a very common chronic inflammatory dermatosis found predominantly in adolescents in both sexes. The appearance of lesions around puberty is related to physiologic hormonal variations. The condition affects the hair follicle, the opening of which is blocked by keratin material resulting in formation of comedones. Comedones may be open having central black appearance due to oxidation of melanin called black heads, or they may be in closed follicles referred to as white heads. The hair follicle containing a comedone is surrounded by lymphocytic infiltrate in papular acne, and neutrophilic infiltrate in pustular acne. Sometimes, the wall of the distended follicle is disrupted so that the contents escape into the dermis where they may incite granulomatous reaction. Impetigo is a common superficial bacterial infection caused by staphylococci and streptococci. The condition may occur in children or in adults and more commonly involves hands and face. The lesions appear as vesico-pustules which may rupture and are followed by characteristic yellowish crusts. Histologically, the characteristic feature is the subcorneal pustule which is a collection of neutrophils under the stratum corneum. Often, a few acantholytic cells and gram-positive bacteria are found within the pustule. The upper dermis contains severe inflammatory reaction composed of neutrophils and lymphoid cells.
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