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Aim: To prepare a list of materials used for ammobilisation for fractured limb with gum bandage. Materials required

Aim: To know the actual length of a Thomas splint & measurement for an animal.

Procedure

Animal is kept in lateral recumbancy with affected limb upward.

After padding & medical bending of Thomas splint, it is fitted upon the fractured limb.

At the time of measurement, the limb should be kept vertical to body for accurate measurement, otherwise the length of Thomas splint may be shorteror longer if the limb is kept forward or backward respectively.

The ring of the Thomas splint is kept close to the axilla (forelimb), groin (hind limb).

Limb is put downward & Thomas splint is pushed upward keeping both the extension bamboo of Thomas splint in crossed manner, measurement of length of Thomas splint is taken up to the bulb of the heel & mark is recorded.

The excess length is trimmed short (figure-1). Two nicks are made on the distal end for retaining the thread in position.

Both the distal ends are tied together with thread, soft padding is placed at the site where hoof is to be kept & retained in position with bandage (figure-3).

Introduction

Measurement of pH of a solution and preparation of different types/strength of buffers are common practices in a laboratory, particularly in the Biochemistry and Molecular Biology laboratories. Therefore, in this chapter you will be acquainted with the procedures of measuring pH of a solution as well as preparation of some of the commonly used buffers in a laboratory.

Potential or Power of Hydrogen Ion (pH)

Measurement of pH of a solution is measuring the molar concentration of hydrogen ion [H+] in the solution, which is an indication of the acidity or basicity of the solution. The symbol pH stands for “power of hydrogen” and numerical value for pH is just the negative logarithm of the molar concentration of hydrogen ions [H+]. The ionic product of water (Kw ) is the basis for the pH scale. The total hydrogen ion concentration from all the sources and it can be experimentally measured.

The pH scale designates the concentration of H+ (and thus of OH−) in an aqueous solution, which ranges between 1.0 M H+ and 1.0 M OH−. The term pH is defined by the expression

Thus, the ionic product of water makes it possible to calculate the concentration of H+, with given concentration of OH−, and vice versa. The value of 7 for pH of a neutral solution is not an arbitrarily chosen figure; it is derived from the absolute value of the ionic product of water. A solution having pH greater than 7 is basic, and the concentration of OH− is greater than that of H+. A solution having a pH less than 7 is acidic.

Aim:- To know the measurement for preparation of an appropriate size of ring of Thomas splint for a large animal.

Objective: Measurement of an appropriate size Thomas splint essential to avoid complications like tight fitting which may affect bone healing.

Materials required: 6mm G.l. wire, jute thread

Aim: Bending of the lower half of the ring of Thomas splint to an angle 45- 60degree to comfort the limb and to provide free circulation.

Importance

After tieing the ring with bamboo splint and padding the ring with jute and cotton .bending the lower half of the ring upto more than 45 degree angle is highly essential because of placement of the fractured limb within the ring of Thomas splint comfortably, so as to the flow of blood circulation in fractured limb uninterruptedly.

It is more common in dogs and frequently seen in the skin and oral cavity. It usually occurs in 5 to 11 years old dogs. Benign melanomas are solitary, circumscribed, alopecic firm and freely movable blue black coloured nodules in the skin. Malignant melanoma is sessile, polypoid to plaque like grey or brown black coloured granules in the skin with ulceration.

The process of fracture healing is unique, in which damaged bone restores its original architecture but it does not form a poorly organized replacement matrix, otherwise known as scar tissue, rather it regenerates the original matrix and retains its mechanical properties. In order to repair bone defects, a combination of cells with osteogenic activity and appropriate scaffolding material can stimulate bone regeneration and its repair. A potential substitute for autologous transplantation should possess 3 elements: osteoprogenitor cells, osteoinductive factors, and an osteoconductive scaffold. Stem cells from adult tissues are attractive materials for cell therapy and tissue engineering. These cells generally have restricted lineage potential when compared to embryonic stem cells, and this may be advantageous in certain therapeutic applications. Bone-marrow-derived mesenchymal stem cells (BMSCs) have proven to be beneficial in bone regeneration. Bone marrow stem cells are pluripotent cells with the capability of differentiating osteoblasts so that they have been used to facilitate bone repair. Several studies have shown that seeding of cultured BMSCs on bioabsorbable implants can induce bone formation in vivo and lead to improved healing of critical-size bone defects.

Mesenchymal stem cells (MSCs) because of their self replication and osteogenic differentiation capabilities are regarded as an excellent source of cells for bone tissue engineering. Autologous stem cells are not always preferable since the quality and quantity of such cells will be affected by metabolic diseases, old age, and osteoporosis. Allogenic BMSCs might be preferable to xenogenic, but they are always not readily available. In addition, allogenic MSCs have the potential for carrying some diseases. The use of non-autologous stem cells isolated from healthy donors offers a major advantage since these stem cells can be thoroughly tested and formulated into off-the-shelf medicine in advance. Major attractive advantage of BMSCs as a source of cell transplantation is their low immunogenecity. It is now well established that BMSCs are immune-privileged cells that do not elicit immune responses due to an absence of their immunologically relevant cell surface markers.

Despite the benefits that minimally invasive surgery and osteosynthesis have brought to fracture management and bone healing, there are still many circumstances where bone healing remains challenging. Large bone defects are serious complications that are most commonly caused by extensive trauma, tumour, infection, or congenital musculoskeletal disorders. In nonunion cases repairing of bone defects with composite biomaterials as defect filler can promote bone regeneration. Currently, the gold standard for bone regeneration is use of autogenous bone graft. In order to avoid morbidity at the donor site or if large amount of autogenous bone is needed, bone substitution materials can be used. Bone substitution materials can be combined with cells such as mesenchymal stem cells (MSCs) to increase bone formation. Bone-marrow derived mesenchymal stem cells (BMSCs) represent an attractive cell population for tissue regeneration. Bone marrow stem cells are pluripotent cells that have been used to facilitate bone repair because of their capability of differentiating into osteoblasts. Several studies on the regeneration of bone have shown that cultured BMSCs, seeded on different bioabsorbable implants are able to induce bone formation in vivo and lead to improved healing of critical-size defects.

Calcium phosphate bone substitutes such as hydroxyapatite (HA) and tricalcium phosphate (TCP) are currently used for bone substitution in many different clinical applications such as repair of bone defects after trauma or tumour and bone augmentation in spinal arthrodesis. Although these bone substitutes are osteoconductive, they often lack the osteogenecity needed to support bone healing in large defects and are slowly degraded in the body. Studies have shown that coating of hydroxyapatite with a calcium silicate layer could encourage cell proliferation and osteogenic differentiation of human bone marrow-derived stromal cells. Silica-calcium phosphate composite in comparison to calcium phosphate-rich biomaterials has a faster resorption rate owing to greater dissolution of Si ions. The use of several growth factors have been studied in bone repair and these factors are known to play a role in differentiation of mesenchymal progenitor cells specific lineages like endothelial cells or osteoblast. Bone morphogenetic protein-2 (BMP-2) has been shown to accelerate bone healing in humans and animal models. BMP-2 acts by osteoinduction and is involved in the differentiation of mesenchymal progenitor cells into osteoblasts. The addition of recombinant human BMP (rhBMP-2) to a self-cross linkable cellulose hydrogels/biphasic calcium phosphate granules construct promotes bone regeneration in a critical-size segmental defect model of non-union in dogs. It is also reported that protein, insulin-like growth factor (IGF-1) stimulates direct migration of human mesenchymal progenitor cells (MPC) and contributes to the recruitment of MPC in bone formation and bone healing.

Key Points

• Electrolyte Imbalance: Regularly monitor and rectify imbalances in potassium, sodium, and other electrolytes dependent on the individual situation. Prompt management requires early detection of metabolic emergencies.

• Fluid Management: To restore intravascular volume and prevent dehydration in many metabolic emergencies, adequate fluid replacement is essential.

• Continuous monitoring of vital signs, laboratory values, and clinical status is essential for evaluating the efficacy of interventions and making necessary modifications.

Introduction

A class of disorders known as "metabolic emergencies" affect metabolism and physiology abnormally in both congenital and acquired forms. Among these ailments are endocrine disorders, thyrotoxicosis, inborn metabolic inefficiencies, and illnesses linked to electrolyte imbalances. Hypercalcemia, hyponatremia, hypoglycemia, hyperglycemia, and diabetic ketoacidosis, as well as hyperuricemia, hyperuremia, and hypercreatininemia due to renal failure, lactic acidosis, hyperammoniemia, and adrenal failure, are metabolic emergencies that pose a life-threatening risk.

Introduction
Metabolism encompasses a series of cellular reactions essential for sustaining life in living organisms. These reactions are part of interconnected pathways within cells, ultimately providing the necessary energy for cellular functions. The importance and evolutionary benefits of these pathways are evident as they are conserved across animals, plants, fungi, and bacteria. In eukaryotes, metabolic pathways operate within the cytosol and
mitochondria, with glucose and fatty acids being the primary sources of cellular energy in animals. Metabolism is organized into distinct pathways to optimize energy capture or minimize energy expenditure. It can be divided into two main processes: anabolism, which involves the synthesis of complex macromolecules, and catabolism, which involves their degradation.
Carbohydrates are the major source of energy in the animal’s diet. Absorbed glucose could be utilized by the animal for several functions. The first priority is the formation of glycogen in the liver, which is stored in muscle and hepatic tissue. However, the body stores very little as glycogen (a starch-like compound), and glycogen could be rapidly hydrolyzed back to glucose through a process called glycogenolysis. This helps in maintaining blood
glucose at a narrow range in normal healthy animals. The second priority is oxidation to form energy (a major function) and is described in the next sections. Since glycogen storage is limited, excess glucose is converted to fat and is stored in adipose tissue. This is accomplished by the breakdown of glucose to pyruvate through a process called glycolysis, which is then available for fat synthesis. The catabolism of glucose occurs in two metabolic pathways: glycolysis and the tricarboxylic acid (TCA; also called citric acid or Kreb’s) cycle.
Glycolysis: Enzymes for glycolysis are located in the cytosol of the cell, and glycolysis occurs in this part of the cell. Glycolysis is the breakdown of 6 C glucose into two 3 C end product pyruvates in aerobic metabolism and lactic acid in anaerobic metabolism. It is a catabolic pathway involving oxidation and yields ATP and NADH (reduced NAD) energy. Glycolysis is the pathway by which other sugars (e.g., fructose, galactose) are catabolized by converting them to intermediates of glycolysis. Fructose can be converted to fructose-6- phosphate by hexokinase. Galactose can enter glycolysis by being converted to galactose- 1-phosphate followed by conversion (ultimately) to glucose-1-phosphate and subsequently to glucose-6-phosphate (G6P), which is a glycolysis intermediate.

Key Points

• It is frequently reported that metal, non-metal, and metalloid components cause toxicity in farm animals.

• The type of element causing toxicity affects both the treatment and the clinical indications of toxicity.

• The best course of action for managing toxicity is to treat symptoms f irst, then, if the causal toxin is known, use targeted antidotes.

Introduction

Animal diets contain a variety of environmental components, including metals and non-metals. Certain substances are necessary for the animal and only become poisonous when consumed in excess, while others simply endanger the animal's health. However, a number of variables, including the absorbed dose, the exposure route, the period of exposure (acute versus chronic), and others, affect how toxic the substance is, and these variables must be taken into account when diagnosing, treating, and managing clinical cases. Given the multitude of factors affecting these metals' toxicity. An attempt is made in this chapter to present a streamlined synopsis of the toxicity of metals, non-metals, and metalloid elements that are frequently encountered.

Aim

Study about method of apposing muscle, fascia, skin over amputed stump.

Indication

Proper healing of amputed stump, avoiding infections.

Description

Limb is amputed generally through diaphysis or by disarticulation method. Whatever is the amputation,the surgeon should always keep as much soft tissue as possible to cover the bone extrimities. It is difficult to achieve in large animal, when amputation is immediately below carpus or tarsus.

Purpose:- To know the method of fitting the immobilised fractured hind limb in Thomas splint.

Description

The fractured site is immobilised properly covering the area joint below and joint above from the fractured site.

The immobilised limb is kept within the prepared Thomas splint.

The immobilised limb is kept straight and come close with the front extension bamboo of the Thomas splint.

The foot is fixed to the distal end of the Thomas splint with bandage roll.

In the first attempt the immobilised limb is secured with the front bamboo splint with bandage roll at several places to avoid posterior movement of the immobilised limb.

At the time of fixing the immobilised limb with anterior extension bamboo of Thomas splint, the limb is fixed with the netting of Thomas splint to avoid medial movement of immobilised limb.

Finally the immobilised limb is covered with bandage roll wrapping around both the anterior and posterior extension bamboo of the Thomas splint to avoid outer movement of the immobilised limb.

The method of immobilisation of the hind limb with Thomas splint has been shown in the figure.

Aim: To secure the foot on the distal end of Thomas splint.

Procedure

1. Foot is placed upon the distal end of Thomas splint.
2. The foot of the animal is wrapped V’- two round with bandage cloth.(Fig.1)
3. 2^nd round of bandage cloth is wrapped around the distal end of Thomas splint.(Fig.2)
4. In 3^rd attempt, the bandage roll is taken from the ground level of the foot & including the distal end of foot.(Fig.3)
5. The bandage roll is taken through the gap between anterior end of Thomas splint.(Fig.3)
6. In 4th attempt, the bandage roll is taken from the volar or plantar aspect of the limb and passed upon the ground level of foot as well as the distal end of Thomas splint.(Fig.4)
7. Final 2 rounds of bandage cloth is wrapped through entire surface of foot.

Reference: Tyagi R.P.S. and Singh J, (2013), Ruminant Surgery, CBS Publishers, New Delhi, pp-353,354

Definition : These are the splints made out of light metal rods or bamboo for correction and immobilization of middle and higher level fracture in animals.

Purpose

Method of tying with bamboo splint with ring is very important because of the following points.

A string fitting with the bamboo splint is required as with loose fitting with it may come up at any stage before actual bone healing.

1. Preparation of diluents 

The diluent is prepared one hour before semen collection so that it is stabilized. The diluent is prepared by mixing the ingredients and kept ready in water bath at 30oC. One of the diluents is detailed below