Blood loss Anemia
Acute blood loss can lead to shock and even death if> 30-40% of blood is lost and hypovolemia developed that not treated aggressively with IV fluids or compatible blood (see blood transfusions, blood transfusions), or both. Causes of acute loss may be known (such as trauma, surgery) or occult. Coagulopathies, bleeding tumors, stomach ulcers or internal and external parasites should be excluded as causes. GI parasites, such as Haemonchus in ruminants and hookworms in dogs can lead to severe loss of blood, especially among young animals. Low-grade, chronic blood loss eventually leads to iron-deficiency anaemia, although a degree of reticulocytosis May exist even after the iron stores are depleted. The trademark of an iron deficiency anemia is a microcytic, hypochromic anemia. This chronic blood loss may be caused by any kind of parasitism in young animals (fleas, lice, intestinal parasitism), but in older animals, GI bleeding from ulcers or tumors is more common.
Infectious disease : Overview
The GI tract is subject to infection by many pathogens, which are a major cause of economic loss due to illness, sub-optimal performance, and death. These infections spread by direct contact or fecal-oral. Many of the pathogens are part of the normal intestinal flora, disease and developed only after a stressful event, such as salmonellosis in horses for transportation, extended anaesthesia or surgery. The intestinal flora is within a few hours after birth, which stressed the importance of the rapid opening of colostrum to protect against septicaemia and intestinal infection.
Definitive etiological diagnosis of infectious diseases of the GI tract depends on the detection of pathogens in the wing or in the feces of the animal. In the herd epidemics, such as an outbreak of acute diarrhoea in undifferentiated newborn calves and piglets, the best opportunity to make a diagnosis is in the earliest stage of the disease by using untreated animals and those for the submission of detailed section and microbiological examination of the intestinal flora. The selective section is not an option, a series of carefully collected daily fecal samples should be at a diagnostic laboratory with a request for special access to cultural techniques, depending on the infectious disease, which is suspected to be weighed. ELISA was developed to the presence of viral antigens in the feces, which can provide a definitive diagnosis (eg parvovirosis).
Respiratory System: Introduction
Large particles of air deposition usually goes in the mucous membranes lining the nasal passages, larynx, trachea, bronchi and, after which they are carried by the mucociliary “ceiling” on the throat to be swallowed or expectorated. Small particles can be deposited as deep as the alveoli, where they are phagocytized by macrophages. Defense against invading micro-organisms and other foreign body is of anatomical structures and two non-specific and immunological mechanisms (both cellular and humoral). These are the factors that determine species and individual susceptibility to diseases and can be manipulated by different management techniques, vaccines, antibiotics and other substances such as interferons and lymphokines. Other factors are the tortuosity of the nasal passages; presence of hair, eyelashes and mucus, the cough reflex, and bronchoconstriction. Zellulären defense include the macrophages, which phagocytizes invaders and presents them (or at least their important antigens) lymphocytes for the promotion of an immune response and neutrophils, which often died in their struggle against the invaders and must be removed, along with its potentially harmful Enzymes. Secretion structures defenses include antiviral interferon for Defence, complement lysis for the invaders, surfactant lining the alveoli to prevent their collapse and to facilitate the macrophage function, fibronectin to block bacterial attachment, antibodies and mucus.
The anatomy of the respiratory tract differs significantly between species in the following features: 1) the form of upper and lower respiratory tract, 2) the size, shape and pattern of bone Turbinate 3) branching patterns of the bronchi, 4) Anatomy of terminal bronchioles, including the collateral ventilation, 5) lobation and lobulation 6) thickness of the pleura 7) completeness of the mediastinum,
relationship of pulmonary arteries in arteries and bronchi bronchioles and 9) presence of vascular shunts, 10) distribution of mast cells and 11 ) Blood supply to the pleura. Any change in the anatomical structure implies variation in the function that influence the pathogenesis of respiratory diseases in a particular species. The 3 main groups of species that are anatomically similar respiratory tract are: 1) cattle, sheep and pigs, 2) dogs, cats, monkeys, rats, rabbits and guinea pigs, and 3) horses and humans. Marked physiological differences also exist between different species. For example, cattle are prone to step back from the drainage of the pharynx, are predisposed to pulmonary hypertension and reduce the ventilation in a cold environment, have relatively small lungs with a low tidal and functional residual capacity and are more sensitive to changes in the environment as the temperatures are most other species. These anatomical and physiological differences largely determine why some pathogens affect only some species (eg Mannheimia (Pasteurella) haemolytica beef, not pig) and why pneumonia is very important in some species (cattle, pigs), but less so in others (Dogs, cats).
Hypoxia (reduced oxygen supply, often called anoxia) causes the clinical symptoms of respiratory disease. It may consist of the following: 1) reduced oxygen-carrying capacity of blood (anemic anoxia, as in the carbon monoxide poisoning or nitrite, true or anaemia due to various causes), 2) reduces the blood flow (stagnant anoxia, as in congestive heart failure or Shock), 3) inadequate alveolar ventilation or dissemination impairment (anoxic anoxia, as in pneumonia, pulmonary edema, chronic congestion, pneumothorax or paralysis of respiratory muscles) or 4) inability of tissues to use available oxygen (eg histotoxic anoxia, as in cyanide Poisoning).
Kompensatorische mechanisms for hypoxia are an increased rate and depth of breathing, is the placement of chemoreceptors in the carotid and aortic bodies; contraction of the spleen, which forces more RBC in the cycle, and higher heart stroke volume and heart rate. If developed cerebral hypoxia, respiratory function can be even more restricted as a result of the depression of neural activity. Erythropoiesis stimulated with hypoxia, although the degree of polycythemia is dependent species. In addition, myocardial, kidneys, heart and liver transplant patients functions can also be reduced, as motility and secretions of the intestine. If compensatory mechanisms are inadequate, a vicious circle can begin in which all body tissues function less efficiently.
Clinical Signs of Respiratory Malfunction
Hyperpnea (an increase of the rate and depth of pulmonary ventilation) becomes dyspnoea, when the breathing seems to be working, causing fears. Hyperpnea is not always a symptom of the disease (for example, worked breathing following vigorous movement in an otherwise healthy animal). Infectious diseases of the respiratory tract that toxemia may also compromise the host, for example, lung inflammation cattle due M haemolytica. Dyspnea can caused by disease of the respiratory tract itself (such as obstruction of the respiratory tract, pneumonia, bronchitis or alveolitis) or other problems (such as heart failure, acid-base imbalances, thoracic effusions, abnormal oxygen-carrying capacity of blood or disruption of neuromuscular function) . Inhalation seen worked with obstructive disease of the estuary of the breast area (such as paralysis larynx, cervical tracheal swabs collapse) or with pleural effusions as inspiratory dyspnoea; worked with the expiry seen below obstructive disease of the thoracic inlet (such as diffuse bronchitis or lung Oedema) as expiratory dyspnea. Other answers are cough, clear, exudates and shallow breathing with grunting, often combined with the threat of Pleuritis. Solid obstacles respiratory tract (eg tracheal swabs neoplasia, foreign or stenosis) or a combination of upper and lower respiratory tract obstructive disorders (such as pleural effusion with congestive heart failure) leads in both expiratory inspiratory and dyspnea.
Respiratory System : Diagnostic technique
If obstructive disease of the upper respiratory tract is suspected, diagnostic procedures are nasopharyngoscopy, pharyngoscopy, laryngoscopy, and tracheobronchoscopy. Laryngeal function should be assessed, and the presence of obstructive lesions within the nasopharynx, oropharynx, larynx, trachea, bronchi or principal place of business identified.
With diffuse or lobar lung disease, diagnostic procedures are transtracheal wash bronchoscopy with bronchoalveolar lavage and transthoracic fine needle aspirates the lungs. The bacterial pneumonia is suspected bacterial culture of transtracheal wash or bronchoalveolar lavage fluid recommended. Cytologic guest transtracheal or bronchoalveolar lavage fluid May aid in the diagnosis of fungus, parasite or allergic lung disease. Transthoracic fine needle aspirates the lungs are often useful in the diagnosis of fungal infections of the lung inflammation, but have lower yields in the final diagnosis of solitary pulmonary lesions. Solitary pulmonary masses often require surgical excision for definitive diagnosis.
In dogs and cats with pleural effusions, thoracocentesis should cytologic and potentially microbiological assessment of the medium. In cats, pleural effusions often occur with cardiac disease and echocardiography performed. In animals suspicion of chylous effusion, serum triglyceride levels and liquid to be determined. Chylous effusions are in connection with the liquid triglyceride levels greater than in the serum.
Acute nasal discarge, sneezing, or both may indicate the presence of infections (viruses or bacteria) or a nasal foreign body. Chronic nasal discharge warrants further investigation into radiography (nose, air bag), nasal computed tomography, rhinoscopy, nasopharyngoscopy, nasal or biopsy. Rhino’s Copy may be of limited value if plenty of thick discharge or bleeding is present. Bacterial cultures of the nasal tissues can be useful if bacterial rhinitis is suspected, but in some species (such as dog and cat) primary bacterial rhinitis is rare and typically occurs secondary to other nasal conditions. Cytologic evaluation of the nasal tissue diagnosis can contribute nasal fungal infections. Serological tests for fungal infections of the respiratory tract to be considered, but these findings should correlate with the patient the clinical symptoms and documentation of the presence of fungal infections of the organisms as a false positive and false negative tests.
Respiratory System : Principles of therapy
Hydration should be maintained. The inhalation of humidified air may facilitate removal of the respiratory tract secretions. Expectorants are sometimes used with the intention that these secretions liquefying. However, they should be read in conjunction with ancillary provisions respiratory therapy such as improved postural drainage, gentle movement, thoracic and percussion, which (in addition to cough) encourages expectoration and the removal of secretions. Expectorants in the traditional doses are of questionable value. Mechanical removal of tenacious and viscid secretions by aspiration may be necessary in serious obstruction of the airways.
Antitussive agents are to alleviate the complaints in respect of unproductive cough, but are contraindicated in the secretion of mucus of the respiratory tract is exaggerated. Products, including atropine contraindicated, at least in theory, because atropine increased the viscosity of the respiratory tract secretions.
Increased resistance respiratory tract caused by bronchial contraction of smooth muscles can be used bronchodilators, which are specified in animals with asthma-like conditions and chronic respiratory diseases. Methylxanthines as theophylline and Aminophyllin, bronchodilators are effective in species other than cattle (and possibly dogs). Isoproterenol, clenbuterol, adrenaline and are generally effective, and sodium cromoglycate in the treatment of horses for small airways disease (such as heaves). Corticosteroid use is justified, allergic conditions. Antihistamines can help relieve the bronchoconstriction by histamine release. Bronchospasm also can be reduced significantly by removing the irritating factors, with mild sedatives, or reducing the times of tension.
In bacterial infections, antimicrobial therapy should be initiated. The goal is to select the most effective means against a particular organism or the least toxic agent of several alternatives. Culture and sensitivity testing of respiratory secretions offer a rewarding, if not infallible, guide for determining the appropriate antibiotic. Knowledge of tissue penetration and pharmacokinetic properties of antimicrobial agents is important as well. The following agents have proved effective in the listed species: cattle oxytetracycline, erythromycin, and sulfonamides, penicillins, sheep and goats-oxytetracycline, and sulfonamides, penicillins; pig lincomycin, spectinomycin, and sulfonamides, penicillins, dogs and cats cephalosporins, chloramphenicol , Amoxicillin-clavulanic acid, aminoglycosides, trimethoprim-sulfamethoxazole, fluoroquinolones, tetracyclines; horse penicillins, sulfonamides and tetracycline, the latter with caution because of an occasional side effect of severe diarrhea. Aminoglycosides are useful, but nephrotoxic. Trimethoprim, usually in combination with a sulfonamide, is useful for respiratory therapy in most species is not licensed for food-producing animals in the United States. Enrofloxacin drugs such as (for the small but not large animals in the U.S.) and ceftiofur may prove effective. Broad spectrum antibiotics should be used when certain bacteria can not be determined, and once started, a full course of therapy should be completed. Several of antimicrobial agents should be used only in full knowledge of possible drug interactions. Because of residues in food animals, veterinarians need these products are appropriate and sound advice to manufacturers.
The Hypoxämie caused by the majority of lung diseases usually can be corrected by the administration of oxygen. However, continuous administration of high concentrations increased the tendency to regional atelectasis absorption so that a deterioration of the Hypoxämie, and can lead to pneumonitis in his own. Hypoxämie is often accompanied by variable degree of hypercapnia and acidemia. Endotracheal intubation and ventilation may be necessary in animals with acute respiratory failure, or in animals, the comatose or apneic. Arterial blood gas and pH provisions, if this is feasible, are very valuable in monitoring the treatment.
Diuretics are pulmonary edema. The osmotic diuretics have a minimal effect on diuresis. Carbonic anhydrase inhibitors (eg acetazolamide) have a moderate impact on diuresis, diuretics and loop (furosemide) have a profound effect.
Aspiration Pneumonia
Aspiration pneumonia is a pulmonary infection is characterized by inflammation and necrosis caused by inhaling foreign material. The severity of the inflammatory reaction depends on the material aspirated, the type of bacteria aspirated, and the distribution of aspirated material in the lungs.
Etiology:
Faulty administration of drugs is a common cause of aspiration pneumonia. Drench of liquids or dose syringe should not be used, faster than the animal can swallow. Drenching is especially dangerous when the animal’s tongue should be noted, if the head is held high, or if the animal coughing or bellowing. The administration of liquids through the nasal intubation is not without risk, and careful technique is especially necessary, weakened animals.
The inhalation of smoke or irritant gases is a rare thing. Aspiration of vomitus or attempts by animals to eat or drink while partially choked may lead to aspiration pneumonia as well. Disruption of deglutition, as in anesthetized or comatose animals (for example, mature cattle under general anesthesia or cows in lateral recumbency), vagal paralysis, acute pharyngitis, abscesses or tumors of the region throat infections, esophageal cancer diverticulum, cleft palate, megaesophagus or encephalitis, are frequent causes predisposing .
Cats are particularly susceptible to pneumonia by aspiration of tasteless products such as mineral oil. In sheep, poor diving technology can lead to aspiration of fluid. Calves and lambs May inhale inflammatory debris affected if diphtheritic with laryngitis. Inhalation of milk by bucket-fed calves can cause an acute necrotizing pneumonia because of the diffuse distribution of foreign material. The muscles of deglutition may be affected in lambs with nutritional myopathy. Pigs fed food fine particles in dry environments May inhale granulated feed. Aspiration pneumonia in cattle following delayed treatment of milk fever is deadly. In dogs with myasthenia gravis, aspiration pneumonia is the leading cause of death.
Clinical results:
A clinical history suggests the last foreign protection quest is the largest diagnostic value. Horses can develop fever of 104-105 ° F (40-40.5 ° C), you can drop back into the normal range in a few days. Fever is also in cats, dogs, and less frequently in cattle. The patient presents with acute dyspnoea, tachypnea and tachycardia. Associated results are cyanosis and bronchospasm. A sweet, fetid breath characteristic of gangrene may be detected by the intensity increases with disease progression. This is often coupled with a purulent nasal discharge is that sometimes dyed reddish brown or green. Occasionally, evidence of naturally aspirated material (such as oil droplets) can be found in the discharge of the nasal mucous or expectorated material. On auscultation, wheezing sounds, pleuritic friction rubs, and crackling sounds of subcutaneous emphysema May to hear. In cows, aspirate ruminal content, toxemia is usually fatal within 1-2 days. Cattle and pigs back more often than horses, but the mortality is high in all species. Recovered animals often develop pulmonary abscesses. In outbreaks after dipping of sheep, losses occur from day to day 2 and 7, then gradually.
Lesions:
The pneumonia is usually in the anteroventral parts of the lungs, it can be unilateral or bilateral and centres in airways. In early stages, lungs congested areas with significantly interlobular oedema. Bronchi are hyperemic and full of foam. The pneumonic areas tend to be cone-shaped with the base in the direction of the pleura. Suppuration and necrosis follow the herd is too soft or LPG, reddish brown, and malodorous. It is usually an acute fibrinous Pleuritis, often with pleural exudate.
Prevention and treatment:
Atropine sulphate helps to control salivation inspired by general anaesthetics (eg thiobarbiturates). The use of an endotracheal tube with an inflatable cuff liquid prevents aspiration during the operation.
The animal should calmly. A productive cough should not be suppressed. Broad spectrum antibiotics in animals known to have inhaled a foreign substance, whether it is a liquid or a steam irritant, without waiting for signs of pneumonia to appear. Care and supportive treatment are the same as for infectious pneumonias. In small animals, oxygen therapy can be useful. Despite all the treatments, the prognosis is poor, and efforts must be based on prevention.
