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Case notes: Surgeon preferences: Bypass considerations based on diagnosis 117 hybrid stage 1 palliation High-risk patients with hypoplastic left heart syndrome may receive a hybrid stage 1 procedure instead of a Norwood operation as the first operation in life. At low flow rates, the pancreas secretes an isotonic fluid that is composed mainly of Na+ and Cl-, as at low flow rates, equal volume of pancreatic juice comes from acinar and ductal cells. Areas of osteoclastic hyperactivity and rampant bone resorption are present next to areas of excessive and disorganized trabecular bone formation. Other causes are coronary occlusion, trauma to heart, chloroform anaesthesia and improper handling of heart during cardiac surgery. An increase in total blood volume increases both systolic and diastolic blood pressures by increased quantity of blood in the arterial system and greater stretching of the vessel wall. The fibres originate from dentate nucleus, which is recent in origin and most well developed in man and so the red nucleus, thalamus and cerebral cortex of opposite side. Ventricular fibrillation occurs when small segments of ventricular myocardium show rapid, irregular ineffective contractions. Cold vasodilation As discussed above, normally during exposure to cold stress, there occurs widespread cutaneous vasoconstriction via hypothalamic mechanism. The thyroid gland increases in weight and size due to hypertrophy of the cells (goitre). Synthetic preparations of progesterone Various synthetic preparations are available under the name prostagens and gestagens. Certain portions of the circulatory system are highly compliant and are especially important as blood reservoirs. Thus, from the functional point of view the tracheo-bronchial tree can be divided into two major zones: i. Cardiovascular adjustments during muscular exercise Severe muscular exercise is the most stressful physiological condition that the cardiovascular homeostasis mechanisms face in everyday life. An increase in change in the initial length (within physiological limits) increases the force of contraction (Po) without changing the velocity (Vmax), i. In progressive shock, the structures of circulatory system begin to deteriorate and various types of positive feedback mechanisms develop. Due to deficiency of intrinsic factor, absorption of vitamin B12 is affected markedly and there may occur pernicious anaemia. Platelets are formed from pseudopodia of megakaryocyte cytoplasm which get detached into the blood stream. When right atrial pressure is increased up to 10 mmHg, the lower neck veins begin to protrude in sitting position (in normal person, in this position, the neck veins are never distended). In the kidney, the structures which form the countercurrent system are loop of Henle and the vasa recta. Afferent impulses, from the cerebral cortex (during conditioned reflexes) and from the mouth (during unconditioned reflexes) reach the dorsal nucleus of vagus. In such children, the disorder must be detected at the earliest and replacement hormonal therapy should be started, otherwise the mental retardation becomes irreversible. The neurotrophins produced by various structures innervated by a particular neuron, bind to the receptors present at the nerve ending. When a graft tissue is taken from one part of the body and transplanted to another part of the body of same individual.

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Finally, complex congenital cardiac procedures may require the perfusionist to consider several diagnoses for a single bypass run. This is done by voluntarily relaxing the external sphincter and contracting the abdominal muscles (straining), thus aiding the reflex emptying of distended rectum. This effect is observed secondary to the metabolic changes in myocardium at a time when there occurs vasoconstriction of splanchnic, renal and cutaneous vessels. In some animals, these fibres release acetylcholine at their nerve endings, but in primates the vasodilator effect is believed to be caused by epinephrine-exciting -adrenergic receptors in the skeletal muscle vasculature. The parts of the central nervous system affected are: cerebral cortex, basal ganglia and internal ear (cochlea). Thus, when the hand is kept in ice water, regional viscosity of the blood shows a threefold increase. If the urine output of only one kidney is blocked, no major changes occur in body fluids composition because the contralateral kidney undergoes compensation. The above-mentioned effects are responsible for dyspnoea and syncope may occur in massive embolism. By digesting collagen tissue, the pepsin breaks apart the meat particles and facilitates further digestion of cellular proteins of meat. It is performed similar to the histamine test except that in this, instead of histamine, 6 mg of pentagastrin (a synthetic gastrin) is given as subcutaneous injection. A significant decrease in the circulating blood volume is sensed by baroreceptors, the cardiac atria, the kidney and the brain. The presence of abundant granular endoplasmic reticulum is an indication of the high level of protein synthesis in neurons. Cortisol stabilizes the lysosomal membrane, probably by inhibiting the phospholipase A2, thereby preventing the release of proteolytic enzymes and hyaluronidase, which contribute to tissue damage and swelling. It may however, be realized that permeability of the filtration membrane is not simply related to molecular size but also to its shape and electrical charge. In the absence of intrinsic factor, vitamin B12 absorption is markedly decreased and the patient may develop pernicious anaemia (see page 162). If it takes place outside zona pellucida, the sperm cannot pass through this membrane. Mesangium is an important component of renal corpuscle; it consists of mesangium cells that are present between the capillary endothelial cells and the basement membrane, especially where the basement membrane encloses more than one capillary. However, for intravenous administration it has to be specially prepared by being very finely emulsified. This allows some contraction of trachea but tracheal lumen cannot be completely obliterated easily. The perfusionist should prepare for cardioplegia immediately after establishing bypass. Disaccharidases such as sucrase, maltase and lactase which split the respective disaccharidases into the monosaccharides. The acinar cells produce a thick secretion containing numerous enzymes (listed in composition of pancreatic juice). Blood serves as a ready-made source of substances stored in it (such as glucose, water, proteins and electrolytes for use in emergency conditions like starvation, fluid loss and electrolyte loss). During exercise, epinephrine via 2 receptors increases blood supply (by causing vasodilation) producing severe contraction and quick fatigue of the skeletal muscles. Cephalic phase refers to secretion of saliva before entering of food into the mouth.

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Focal adhesions attach the cell to the basal lamina and also to actin filaments present inside the cell, and thus help in cell movement. At varying times after birth, secondary centres of endochondral ossification appear in the cartilages forming the ends of bones. Histological structure Adrenal cortex the adrenal gland is covered by a connective tissue capsule from which septa extend into the gland substance. The temperature of the water bath is controlled, so that the temperature of blood can be maintained. The rhythmic cyclic changes (proliferative and secretory) occur with the onset of menstrual cycle. Therefore, lung compliance is determined on the basis of following elastic forces: Elastic forces of the lung Tissues due to elastic and collagen fibres contribute smaller amount of elasticity. Gastrocolic reflex Gastrocolic reflex refers to contraction of colon induced by entry of food into the stomach. However, blood flow to the vital organs is provided at the cost of other body tissues such as skin, abdominal viscera, kidney, and skeletal muscles. Note that the veins are much more compliant than the arteries at low pressure because veins are not completely distended at these pressures. Pressure changes in pulmonary artery Pressure curve in the pulmonary artery is similar to that of aorta but pressures are low (about one-sixth of that in aorta). Their muscular fibres serve to pump the lymph from core of villi towards the submucosal lacteals. The transepithelial transport occurs in body cavities lined by continuous sheet of cells such as in gastrointestinal tract, renal tubules, pulmonary airways and other structures. Maintenance of external potassium balance As mentioned earlier, external potassium balance refers to maintenance of constant body potassium, i. Under normal circumstances, the circulatory compensatory mechanisms described above eventually cause full recovery without help of outside therapy during the stage of nonprogressive shock. For example, when the Na+ concentration of the portal vein blood is increased, there is reflex reduction in jejunal NaCl absorption. It changes the composition of glomerular filtrate and reduces its volume markedly. Arrows on the left (green) indicate increase and arrows on right (blue) indicate decrease (B). This is due to a portion of the aortic blood flow being diverted to the pulmonary system. Stokes-Adams syndromerefers to an increased sensitivity of the carotid sinus seen in some elderly individuals who experience syncope as a result of vagally mediated sinus arrest, which causes a prolonged period of ventricular systole. Progesterone synthesized by placenta diffuses back into the maternal circulation and also in the foetal circulation. In emergency situations like stress, extreme exercise and trauma, the nervous system stimulates the adrenal medulla to release epinephrine. Oxytocin and endothelin are important hormones regulating the processes which occur during this phase. Depolarization moving towards an active electrode in a volume conductor produces a positive deflection, whereas depolarization moving in the opposite direction produces a negative deflection. When the body moves downwards from height towards the earth, the force due to deceleration acting in the long axis of the body from foot to head is called negative g. Inhaled nitric oxide is commonly available for the post-bypass period to treat pulmonary hypertension.

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Cytotoxic T cells bind antigen-bearing cells (target cells) tightly and destroy them by the following mechanisms: i. The inner membrane in addition, contains lollipop-shaped globular structures present between the layers of membrane. Further, after menopause, women initially have more rapid bone loss because of additional factor of oestrogen deficiency. The major types of phospholipids are phosphatidyl choline, phosphatidyl ethanolamine, glycospingolipids, sphingomyelin and cholesterol. This can occur due to the heart ejecting less forcefully in the setting of a prime temperature which is less than patient temperature and if the prime ionized calcium level is lower than the patient value, particularly in neonates and infants. This is the reason for the sigmoid nature of oxygen haemoglobin association or dissociation curve. Due to power stroke, the actin filament slides over the myosin filament producing contraction. As discussed in functional anatomy, the cardiac muscle acts as a physiological syncytium due to the presence of gap junctions amongst the cardiac muscle fibres. Its function is to restrict excessive movements of the heart as a whole and to serve as a lubricated container in which different parts of the heart can contract. Blood-borne antigens entering the spleen are phagocytosed and processed by macrophages and fixed phagocytic mononuclear cells. There are descending tracts to the vasomotor area from cerebral cortex (particularly the limbic cortex) that relay in the hypothalamus. These are filled with progesterone (progesterone reservoir) which is released continuously for one year. Such changes in water and solute excretion, without comparable alterations in intake, would prove disastrous due to alterations in fluid and electrolyte balance. It is calculated because the haematocrit is estimated from the venous blood whose haematocrit is greater than the whole body. Although diaphragm contains very few muscle spindles, but it also shows reflex contraction. Ac tion potential c an c onduc t impulses Examples are: Ac tion potential of a nerve fibre, skeletal musc le and c ardiac musc le Changes in excitability during electrotonic potential 1. Buccal phase refers to secretion of saliva caused by stimulation of buccal receptors by the presence of food in the mouth. The increased production of thrombin accompanies bleeding in pregnancy is associated with preterm labour. The granules of basophilic cells are stained with basic dyes (like haematoxylin) and contain abundant dense core vesicles. In summary, the important difference between a situation of euvolaemia and volume expansion is that the renal response in the later involves the entire nephron and is not limited to the collecting duct as in the former. Thiazide diuretics act on this cortical diluting segment and have medium efficacy, because only a small part of the filtered solute load reaches this part of the tubule. The principal bronchi right and left which are two major divisions of trachea constitute the first generation. However, at very high heart rate, filling may be compromised to such a degree that cardiac output per minute falls and symptoms of heart failure develop. Curare or the active principle of D-tubocurarine prevents the neuromuscular transmission by combining with acetylcholine receptors. Regulation of gene expression As discussed earlier, each nucleated somatic cell in the body contains full genetic message, yet there is great differentiation and specialization in the functions of various types of adult cells. The part of the axon between the axon hillock and the beginning of the myelin sheath is called the initial segment. For example, when blood pressure falls due to prolonged slow bleeding, there occurs tightening of blood vessel walls by vascular tone adjustment secondary to less stress on the vessel wall (reverse stress relaxation mechanism). The epiphyseal centres are more sensitive to oestrogen than testosterone; for this reason, average height of females is little less than the males. The axons of I-neurons cross the mid-line and descend on the contralateral side of spinal cord to make contact with the spinal motor neurons of inspiratory muscles, namely, the diaphragm (supplied by the phrenic nerve arising from C3 to C5 spinal segments) and the external intercostal muscles (supplied by the intercostal nerves).

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The action potential frequency is linearly related to the increase in arterial pressure over a wide range. It is obvious that greater the concentration of the molecules of gas, the greater would be the force exerted by the molecules against the container walls at any given time. The marginated neutrophils are emigrated in a large number from the blood at the site of infection caused by the foreign microorganism. When both adrenergic and cholinergic systems are blocked in humans, the heart rate is approximately 100 beats/min. Its cardinal features are a triad of akinesia, rigidity and tremor; of which akinesia is a hypokinetic feature while rigidity and tremors are hyperkinetic features. Alimentary canal is a long tube starting at the mouth, passing through the pharynx, oesophagus, stomach, small intestine, large intestine, rectum and ending at anus. The elastic vessels act together with arterioles (resistance vessels) to convert this pulsatile flow into a steady continuous flow in the tissue capillaries, which allows maximum exchange between the blood and tissues. The interstitial fluid of the renal cortex has the same osmolality as that of plasma, i. At acceleration more than 5 g with body in long axis, the pressure in the veins in the lower limbs rises to over 450 mmHg. This is because of the fact that due to concentration gradient, the positive ions diffuse outside leaving the nondiffusible negative ions inside the cell. The clitoris is analogous to male penis, but unlike the penis, the clitoris is not functionally related to the urethra or to urination. Radiofrequency Ablation: Cardiac catheter with electrodes attached to its tip is passed into the chambers of the heart, and exact location of ectopic focus or accessory bundle responsible for arrhythmia is identified. Increase in venous resistance due to compression of peripheral veins within or without causes an increase in peripheral venous pressure. Lymphocytes were isolated from the children, then a normal gene was introduced by means of a retrovirus vector and the cells were replaced. The half-life of T3 is approximately one day only, due to its lesser affinity for the plasma proteins. The above-described neurons of dorsal horn are arranged in four sets of longitudinal neuronal columns. Total gastrectomy the patients who undergo a surgical removal of the stomach or gastric bypass surgery (in which the stomach is stapled), the loss of reservoir function of the stomach may produce the following effects: Nutritional disturbances after gastrectomy 1. Apoptosis to destroy the cells that represent a threat to the integrity of the organism. Hyperosmotic volume expansion results when excessive amount of hypertonic saline is administered. Since high alveolar pO2 provides favourable environment for the growth of Mycobacteriun tuberculosis so the apices of lungs are more predisposed to tuberculosis. The concentration of the proteins synthesized by inducible genes is regulated by various molecular signals. Indeed, it is a physiologic marvel, or gastric walls would suffer the same fate as a piece of swallowed meat.

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The pulmonary receptors along with atrial receptors constitute the so-called low-pressure receptors or cardiopulmonary receptors and play an important role to minimize arterial pressure changes in response to change in blood volume as discussed above (see page 345). Prostacyclin formed from the membrane phospholipids inhibit thromboxane formation, and thus curtail the process of further plug formation. In the central nervous system of mammals myelin sheath is formed by oligodendrocytes rather than Schwann cells. Erythropoietin increases erythropoiesis by acting at the site of erythropoiesis (It may be yolk sac, liver, spleen and bone marrow depending upon the age). At this point, the force developed is called maximum isometric force and is represented by Po. Properdin (a circulating protein) stabilizes the activating enzyme complex that is why the alternative pathway is also called properdin pathway. As the name indicates it is made up of copper and its shape resembles the letter T. Afferent impulses from proprioceptors Proprioceptors are the receptors present in the muscles, tendons and joints and are stimulated during change in the position of different parts of the body. This occurs due to an intrarenal mechanism known as autoregulation (also see page 315). The electromyographic records obtained during different grades of muscle contraction have the following characteristics: 1. The pancreatic juice is the major source of digestive enzymes that digest all components of the food-proteins, carbohydrates, fats and nucleic acid. In this condition, bilateral degeneration of white fibres of the dorsal column and lateral column of the spinal cord occurs, especially involving the lumbosacral segments. Because aortic and cardiac baroreceptors respond to raised pressure so the occlusion of both carotid arteries cause only a moderate pressure response. During digestion and absorption, the villi contract quickly with an irregular rhythm and relax slowly. An increase in arterial elastic constant (or loss of elasticity of vessel wall) with advancing age results in decreased stretching of the elastic vessels during systole. During cell division, the chromatin material is converted into rod-shaped structures, the chromosomes. Arterial head failure poses a significant risk to the patient on cardiopulmonary bypass. Before discussing this important classification it will be useful to be familiar with the various terminologies used in relation to nerve fibres and certain facts about the conduction velocity in nerve fibres. Protein digestion, which starts in the stomach, is completed in the enterocyte of small intestine. Some fibres from the cerebellum also reach the nucleus of oculomotor nerve and the tectum. The process of gene rearrangement is responsible for the generation of 10 billion antigen-specific immunoglobulins. It is a condition associated with development of atherosclerosis in the coronary arteries, which supply the heart muscles (myocardium). Therefore, osmolarity is affected by the volume of the various solutes in the solution and the temperature, while osmolality is not. Such situations, for nearly isometric contraction, permit development of maximal tension per contraction. In humans, this area is rudimentary, but in lower animals it forms the intermediate lobe of the pituitary. The red cells can become more rigid as a result of pathological changes in the membrane or in the cell contents caused by a number of red cell disorders. Sertoli cell activity is critically important for all subsequent events in male sexual differentiation. Medial medullary syndrome Medial medullary syndrome results from occlusion of the blood supply (anterior spinal artery and its paramedian branches) to medial zone of the medulla. The degradation products of testosterone include androsterone, epiandrosterone and etiocholanolone.

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The amount of these bands can be quantified using densitometric staining techniques. In Each Case, the Osmotic Load Excreted is Same (700 mOsm /Day) Principal factors. The first and shortest part (25 cm long) of the small intestine is also the widest and most fixed part. It is a double-headed molecule that moves its cargo towards the positive ends of microtubules. The above-mentioned examples of homeostatic control mechanisms are only a few of the many hundreds to thousands in the body, all of which have certain characteristics in common. This fact is confirmed by the observation that local injection of 1% procaine solution into the affected muscles decreases rigidity by abolishing the -discharge. Endothelin-1 produced by endothelial cells is one of the most potent vasoconstrictor agents yet isolated. The adrenaline apnoea observed on injection of high doses of adrenaline has been explained due to the fact that the adrenaline causes a large rise in arterial pressure which in turn inhibits respiration by afferent impulses from the baroreceptors to respiratory centres. Renal handling of urea Glomerular filtration Urea is freely filtered into the glomerular filtrate. Hormones regulate different bodily processes such as growth, maturation, differentiation, regeneration, reproduction and behaviour. The excessive iron is deposited in liver, heart and endocrine organs and produces damage. The skin becomes more or less a bloodless sheet of tissue insulating the deeper warmer tissue from the cold environment. But glucocorticoids promote gluconeogenesis, as well as the storage of carbohydrates as hepatic glycogens. Because of this, the action potential spreads through the cardiac muscles very rapidly. Velocity of transmission of pulse wave Velocity of transmission of pulse wave is independent of and much higher than the velocity of blood flow, the maximum value of which in larger arteries is only 50 cm/s. Deep hypothermia may be especially helpful with multidose cardioplegia protocols as temperature alone can have an arresting effect and direct redosing of cardioplegia in neonates is difficult. However, the speed of propagation of action potential varies in different tissues. Both oestrogen and progesterone work best with co-operation of hypothalamopituitary-adrenal cortex axis. This extraction is facilitated by the distance between the presinusoidal vessels at the centre of acinus and postsinusoidal vessels at the periphery of acinus. This tract descends through the anterior funiculus (within the sulcomarginal fasciculus). The sources of prolactin during pregnancy are placenta, amniotic fluid and maternal anterior pituitary gland. A reflection of the dura mater called the diaphragm sellae, extends across the top of sella and separates the pituitary gland from the brain. Growth promoting factors, like epidermal growth factor, insulin and somatomedin-C are present in the human milk. The external genitalia derived from the common anlagen in male and female are shown in Table 9. The enlargement is mainly due to hypertrophy and to some extent hyperplasia of the myometrial smooth muscle fibres.