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See also Free radicals Proaccelerin (factor V) depression symptoms pdf cheap 150mg bupropion mastercard, 585 depression test ham-d quality bupropion 150 mg, 585t depression test bc buy generic bupropion, 586f Proalbumin anxiety panic attacks buy generic bupropion 150 mg line, 502 Proaminopeptidase, 462 Probes, 392­393, 404. See also specific type in cartilage, 542 as catalytically inactive proenzymes, 79 cleaving synaptobrevin, 502 mucin resistance to , 510 of neutrophils, 607, 607t in protein degradation, 239, 240f, 462 Proteasome, 495 degradation in, 498 Proteasomes, misfolded proteins in, 497 ubiquination in, 498­499, 499f Protein. See also specific proteins life cycle of, 22f prenylation, 225 translocation of, 22f Protein 4. See also Primary structure quaternary, 32, 35, 36f of hemoglobins, allosteric properties and, 44­48 stabilizing factors and, 36­37 secondary, 31­35, 32f, 33f, 34f peptide bonds affecting, 32, 32f supersecondary, 35 tertiary, 32, 34f, 35 stabilizing factors and, 36­37 Protein synthesis amino acids in, 133, 133f on ribosomes, 22f Protein turnover, 76, 239 membranes affecting, 503­504 rate of enzyme degradation and, 76­77 Proteinases. See also specific type and Peptides acute phase, 568­569, 569t negative, vitamin A as, 470 L-amino acids in, 14­16 asymmetry of, membrane assembly and, 503, 503f binding, 442­443, 442t catabolism of, 239­246 classification of, 31 configuration of, 31 conformation of, 31 peptide bonds affecting, 19 core, 533, 534 in glycosaminoglycan synthesis, 534­535 degradation of, to amino acids, 239, 240f denaturation of protein refolding and, 39 temperature and, 66 dietary digestion and absorption of, 462 metabolism of, in fed state, 137­139 requirements for, 465 dimeric, 35 domains of, 35, 37f in extracellular and intracellular fluid, 407, 407t fibrous, 31 collagen as, 40 function of, bioinformatics in identification of, 29 fusion, in enzyme study, 60­61, 60f globular, 31 Golgi apparatus in glycosylation and sorting of, 487 identification, by homology, 87­88 import of, by mitochondria, 488­491, 491t loss of in trauma/infection, 465 in membranes, 409­410, 410t, 506. See also Glycoproteins; Membrane proteins ratio of to lipids, 407­408, 407f modular principles in construction of, 31, 39 monomeric, 35 phosphorylation of, 79, 80, 80f, 81t. See also Phosphorylation posttranslational modification of, 31, 40­41, 41f, 366 purification of, 21­24 receptors as, 421, 426­427 sequences or molecules directing, 488t soluble, 31 structure of, 32­38 diseases associated with disorders of, 39­40 folding and, 38­39, 39f higher orders of, 31­41 molecular modeling and, 38 nuclear magnetic resonance spectroscopy in analysis of, 38 primary, 21­29, 31. See also Primary structure prion diseases associated with alteration of, 39­40 quaternary, 32, 35, 36f secondary, 31­35, 32f, 33f, 34f, 35f, 36f supersecondary, 35 tertiary, 32, 35, 36f x-ray crystallography in analysis of, 37­38 synthesis of, 139, 353­368. See Peroxisomal-matrix targeting sequences PubMed, 86, 648 "Puffs," polytene chromosome, 315, 316f Pulmonary infection/heart failure, 625 Pumps, 406, 413 in active transport, 419, 419f Purification, protein/peptide, 21­24 Purine nucleoside phosphorylase deficiency, 299 Purines, 285 Purines/purine nucleotides, 285­289, 285f, 288f biosynthesis of, 292­293, 293f, 294f, 295f, 296f catalysts in, 293, 293f pyrimidine synthesis coordinated with, 297 dietary nonessential, 292 metabolism of, 292­301 disorders of, 297­299 gout as, 297 uric acid formation and, 297, 299f regulation of, 297f, 299f "salvage" reactions in, 293, 294f, 296f ultraviolet light absorbed by, 288 Puromycin, 367, 367f Putrescine, in polyamine synthesis, 265f Pyranose ring structures, 114, 114f, 115f Pyridoxal phosphate, 52, 475, 475f in heme synthesis, 272 in urea biosynthesis, 241 Pyridoxine/pyridoxal/pyridoxamine (vitamin B6), 468t, 475­476, 475f deficiency of, 468t, 475 xanthurenate excretion in, 257, 257f excess/toxicity of, 476 Pyrimethamine, 477 Pyrimidine analogs, in pyrimidine nucleotide biosynthesis, 297 Pyrimidine nucleotide biosynthesis, 295­296 regulation of, 296f, 297f Pyrimidines, 285, 299f Pyrimidines/pyrimidine nucleotides, 285­289, 285f, 288f dietary nonessential, 292 metabolism of, 292­301, 300f diseases caused by catabolite overproduction and, 300­301 water-soluble metabolites and, 299­300, 300f precursors of, deficiency of, 300 synthesis of, 285­289, 298f catalysts in, 295 purine synthesis coordinated with, 297 regulation of, 297, 298f ultraviolet light absorbed by, 288 Pyrophosphatase, inorganic in fatty acid activation, 96, 184 in glycogen biosynthesis, 157, 158f Pyrophosphate free energy of hydrolysis of, 94t inorganic, 96, 96f Pyrrole, 43, 44f Pyruvate, 132 formation of, in amino acid carbon skeleton catabolism, 248­254, 251f­252f in gluconeogenesis, 137 oxidation of, 146­147, 147f, 153­155, 153f, 154f, 155t. See Retinoic acid response element Rate constant, 65 Keq as ratio of, 65 Rate-limiting reaction, metabolism regulated by, 76 Rb protein. See Retinoblastoma protein Reactant concentration, chemical reaction rate affected by, 64­65 Reactive oxygen species. See Retinol Retinaldehyde, 468, 469f Retinitis pigmentosa, essential fatty acid deficiency and, 200 Retinoblastoma protein, 329 Retinoic acid, 468, 469f. See Radioimmunoassays Riboflavin (vitamin B2), 98, 468t, 474 in citric acid cycle, 146 coenzymes derived from, 52, 474 deficiency of, 468t, 474 dehydrogenases dependent on, 99­100 Ribonucleases, 311 Ribonucleic acid. See Sodium dodecyl sulfatepolyacrylamide gel electrophoresis Se gene, 602 Sec12, 500 Sec61p complex, 495 Second messengers, 79, 427, 428t, 446­454, 448t, 450t. See also Signal transduction across membrane Signal hypothesis, of polyribosome binding, 493­495, 494f, 494t Signal peptidase, 494f, 495 Signal peptide, 495, 487, 494 albumin, 569 in protein sorting, 488, 488f, 489f, 494, 494f in proteins destined for Golgi apparatus membrane, 499 Signal recognition particle, 494 Signal sequence, 500, 502. See also Carbohydrates amino (hexosamines), 116, 117f glucose as precursor of, 180, 181f in glycosaminoglycans, 119, 180, 181f in glycosphingolipids, 180, 181f interrelationships in metabolism of, 181f classification of, 113, 114t deoxy, 116, 117f "invert," 117 isomerism of, 113­115, 114f, 115f nucleotide, in glycoprotein biosynthesis, 508­509, 508t "Suicide enzyme," cyclooxygenase as, 200­201 Sulfatases, 536 Sulfate, 535 active (adenosine 3-phosphate-5phosphosulfate), 288, 288f, 612 in glycoproteins, 508 in mucins, 510 Sulfatide, 126 Sulfation, of xenobiotics, 611­612 Sulfo(galacto)-glycerolipids, 209 Sulfogalactosylceramide, 209 accumulation of, 211 Sulfonamides, hemolytic anemia precipitated by, 598 Sulfonylurea drugs, 191 Sulfotransferases, in glycosaminoglycan synthesis, 535 Sunlight. See also specific type Testosterone, 429f, 430f binding of, 442t, 443 metabolism of, 432, 433f synthesis of, 432, 433f Testosterone-estrogen-binding globulin (sex hormone-binding globulin), 443, 442t, 569t Tethering, 499, 500 Tetracycline (tet) resistance genes, 391, 392f Tetrahedral transition state intermediate, in acidbase catalysis, 54, 55f Tetrahydrobiopoterin, 237f Tetrahydrofolate, 477, 477f Tetraiodothyronine (thyroxine/T4), 428, 436­437 storage/secretion of, 441­442, 442t synthesis of, 436, 437f transport of, 442, 442t Tetramers hemoglobin as, 45 histone, 312­313 Tetroses, 113, 114t Tf. See also Vitamin E as antioxidant, 102, 128, 471, 472f deficiency of, 468t -Tocopherol, 485 Tocotrienol, 471­472, 471f. See Aminotransferases Transamination, 133, 133f in amino acid carbon skeleton catabolism, 248, 248f, 249f citric acid cycle in, 146, 146f in urea biosynthesis, 241­242, 241f Transcortin (corticosteroid-binding globulin), 442, 442t Transcript profiling, 400­402 Transcription, 304, 343­346, 344t, 345t, 405 activators and coactivators in control of, 344­345, 344t, 345t bacterial promoters in, 338­339, 340f control of fidelity and frequency of, 338­343 eukaryotic promoters in, 339­343, 340f, 341f in gene expression regulation, 376­381, 384, 384t. See Thyrotropin-releasing hormone Triacylglycerols (triglycerides), 124, 124f, 212, 222 in adipose tissue, 131 digestion and absorption of, 460, 461f excess of. See Hypertriacylglycerolemia interconvertability of, 137 in lipoprotein core, 212, 213f metabolism of, 132, 133f, 134, 135f in adipose tissue, 220­221, 220f fatty liver and, 218, 219f hepatic, 218, 219f high-density lipoproteins in, 216­217, 217f hydrolysis in, 205 reduction of serum levels of, drugs for, 232 synthesis of, 206f, 207 transport of, 214­215, 214f, 215f, 216f Tricarboxylate anions, transporter systems for lipogenesis regulation and, 197 Tricarboxylic acid cycle. See also Thyroid-stimulating hormone Tumor cells, migration of, hyaluronic acid and, 539 Tumor progression, 623 Tumor promoter, 623 Tumor suppressor genes, p53, 333, 623 Tunicamycin, 518, 518t Twin lamb disease. See Vitamin D response element Vector, 405 cloning, 390­391, 391f, 392f, 391t, 405 expression, 392 Vegetarian diet, vitamin B12 deficiency and, 476 Velocity initial, 66 inhibitors affecting, 71, 71f maximal (Vmax) allosteric effects on, 78 inhibitors affecting, 71, 71f Michaelis-Menten equation in determination of, 67­69, 68f substrate concentration and, 66­67, 67f Venoms, 598 Very low carbohydrate diets, weight loss from, 173 Very low density lipoprotein receptor, 214, 215 Very low density lipoproteins, 135, 212, 213t, 230 in fed state, 138 hepatic secretion of, dietary and hormonal status and, 218, 219f metabolism of, 135, 135f, 214­216, 216f in triacylglycerol transport, 220, 214f, 216f Vesicles coating, 500­502, 501f brefeldin A affecting, 502 genetic approachs to study, in yeast, 499 secretory, 487, 489f targeting, 49­500, 501f transport, 487, 499­502, 500t, 501f types and functions, 499t vi. See Initial velocity Vimentins, 563t, 564 Vinblastine, 563 Vinculin, 532, 532f Viral infection, 498, 627 Viral oncogenes. See Oncogenes Virtual cells, 90 Viruses glycan binding of, 524­525 host cell protein synthesis affected by, 365­366, 367f Viscous mucus, 625 Vision, vitamin A in, 468t, 469, 469f Vitamin A, 468­470, 468t, 469f, 469f deficiency of, 468t, 470 excess/toxicity of, 470 functions of, 468t, 469 in vision, 468t, 469 Vitamin B complex. See Biotin Vitamin K, 468t, 472­473, 472f, 473f, 587­588 calcium-binding proteins and, 473, 473f in coagulation, 472, 472f coumarin anticoagulants affecting, 587­588 deficiency of, 468t Vitamin K hydroquinone, 473, 473f Vitamins, 2, 467­480, 468t. See Variable numbers of tandemly repeated units Voltage-gated channels, 416, 417, 556t von Gierke disease, 160t, 298 Von Hippel-Lindau syndrome, 240 von Willebrand disease, 588 von Willebrand factor, 588 in platelet activation, 589 Warfarin, 472, 588 phenobarbital interaction and, cytochrome P450 induction affecting, 611 vitamin K affected by, 472 Water, 2, 6­9 as biologic solvent, 6, 7f biomolecular structure and, 7­8, 7t dissociation of, 9 in hydrogen bonds, 6, 7f as nucleophile, 8­9 permeability coefficient of, 409f structure of, 6, 7f Water channels, 418 Water solubility, of xenobiotics, metabolism and, 609 Watson-Crick base pairing, 8, 302 Waxes, 121 Weak acids, 10 buffering capacity of, 11­12, 12f dissociation constants for, 10­11, 12 Henderson-Hasselbalch equation describing behavior of, 11­12, 12f physiologic significance of, 10­11 pK/pKa values of, 10­13, 13t Weak bases, 10 Wernicke-Korsakoff syndrome, 468t Wernicke encephalopathy, 473 Western blot transfer procedure, 393, 393f, 405 White blood cells, 593, 605­607. Bio 5491 - Advanced Genetics Human Genetics Lecture #1 March 31, 2016 Cristina de Guzman Strong, Ph. Department of Medicine Dermatology/Pharmacogenomics Center for the Study of Itch McDonnell Basic Sciences 770 cristinastrong@wustl.

These cells lack a true nucleus and organelles and have a cell wall and a cell membrane depression symptoms eyes bupropion 150 mg otc. Eukaryotic Cells Eukaryotic cells: cells found in all organisms except bacteria and archaea anxiety 025 mg order bupropion 150 mg line. These cells contain subcellular structures called organelles anxiety group activities buy bupropion line, including a nucleus mood disorder care plan order 150 mg bupropion amex. Golgi apparatus: the organelle responsible for packaging and processing complex macromolecules before they are transported to other parts of the cell. Lysosomes are compartments that envelop and destroy waste materials within the cell. These organelles are found primarily in plant cells but may also be observed in other organisms. Cilia: finger-like projections founds in eukaryotes that primarily serve as sensors for the cell. Flagella: similar to cilia, flagella are tail-like structures that protrude from the cell and are used to control the motion of the cell. Centrioles: found in animal cells, these organelles aid the process of cell division. General Discussion of Energy the two concepts most basic to science are matter and energy. Thermodynamics Thermodynamics: the physics of what is and is not possible with regard to energy. First law of thermodynamics: Energy can be transferred and transformed, but it cannot be created or destroyed (conservation of energy). Second law of thermodynamics: Every energy transfer or transformation results in the release of heat from the system to the rest of the universe. The complex structure of a cell includes pathways along which metabolism proceeds, aided by enzymes. Bioenergetics: the study of how organisms manage energy, including heat production and transfer and regulation of body temperature (endothermy and ectothermy). At other times, the process proceeds without atmospheric oxygen, but this is less efficient. I Anaerobic pathway of cellular respiration: Food (especially carbohydrates) is partially oxidized, and chemical energy is released; however, atmospheric oxygen is not involved in the process. I Aerobic pathway of cellular respiration: Food is completely oxidized to carbon dioxide and water, and chemical energy is released; atmospheric oxygen is involved in the process. The Krebs cycle, electrontransport chain, and oxidative phosphorylation are important concepts here. Photosynthesis: conversion of light energy into chemical energy on which, directly or indirectly, all living things depend. Enzymology Enzymology: the study of the speed of the process of transformation of energy in a cell; enzymes are biological catalysts that accelerate the rate of a reaction without themselves being consumed by that reaction. Movement of Molecules Small molecules are steadily transported across the cell membrane. Types of transport include diffusion and passive transport; osmosis (a special case of passive transport); and active transport. A single, intact chain of life extends backward from today to the first bacteria on Earth. Eukaryotes have much more complicated genomes, and therefore, their process of reproduction is more complex. The Cell Cycle the cell cycle describes the entire reproductive life cycle of a cell and occurs in an orderly sequence. When not dividing or preparing to divide, the cell exists in a resting state, known as G0 phase. It can be divided into three shorter phases: I and begin attaching to the kinetochores. I Anaphase: chromosomes split, and sister chromatids separate to opposite poles of the cell. Cytokinesis: division of the cytoplasm into two identical, separate daughter cells. I I I G1 phase: the point in the cell life cycle where most cell growth occurs, organelles are synthesized, and nutrients are collected.

All team members were trained by an expert tracer on an identical set of lesions and followed detailed written and video protocols depression no friends bupropion 150mg with amex. An experienced neuroradiologist reviewed all lesions to create metadata depression test form order bupropion 150 mg otc, including the number and location of lesions (left/right hemisphere; cortical/subcortical) anxiety questionnaires for children generic 150 mg bupropion fast delivery, type of stroke (embolic depression and memory loss buy cheap bupropion 150 mg on line, hemorrhagic), primary stroke location, vascular territory, and severity of periventricular and deep white matter hyperintensities. Preclinical studies show that lesions of the substantia nigra (par compacta) impair both motor performance and reward seeking behavior. After 14 weeks of survival, rats were again anesthetized and Fluorogold (Flg) was injected into the left and right striatum. Four days later, animals were overdosed with anesthetic, perfused with saline and formaldehyde and the brain removed for cryosectioning. Results: Flg-injections into the striatum retrogradely labeled neurons in the midbrain. The reduced number of projection neurons in the ischemic henmisphere is consistent with the loss of trophic support from the striatum. While extensive stroke research conducted thus far has aimed to better characterize the complex processes mediating brain tissue damage and recovery after stroke, our full understanding of these processes and designing comprehensive drug treatments to elicit most beneficial clinical outcomes are still in their nascent stages. To further advance this field of research, we used a systems biology approach by combining large-scale multiplexed fluorescence immunohistology of rat brains after focal ischemic injury with whole brain slide scanning using a customized multispectral imaging platform. Unique combinations of these biomarkers enabled a comprehensive identification and quantitation of all relevant cell types (neurons, astrocytes, oligodendrocytes, endothelial cells, microglia, immune cells, etc. The results show dynamic and highly complex spatiotemporal changes in brain tissue remodeling and recovery after ischemic injury eliciting distinct cellular/molecular and specific niche responses that develop both proximally and distally to the site of injury. This work demonstrates the crucial need and a workable solution to apply comprehensive multiplex fluorescence biomarker screening and multispectral imaging to study the systems biology of brain in response to ischemic injury. The practical computational solutions pertaining to processing very large image datasets (including those involving multiplex 3D imaging of the entire brain using array tomography) and multi-parametric computational image analysis of these datasets are currently in development. With the exception of clot busting drugs (tPa) and endovascular therapies, neurorehabilitation is the only therapy in clinical use. Pharmacological attempts to improve recovery have included the use of molecular effectors of neuroplasticity as targets. Previous studies have shown that repeated neuronal stimulation of the peri-lesioned area with optogenetics induces a significant improvement in cerebral blood flow and neurovascular coupling response. Up to now the mechanisms underneath the reshaping of brain circuitry induced by rehabilitation after stroke are still unknown. In order to promote the functional recovery after stroke we use either an optogenetic strategy to stimulate targeted excitatory neurons in the peri-lesional region or motor training on a robotic platform. In the first case, we repeatedly stimulate with a 473 nm laser ChR2-transfected neurons five days a week. In the second paradigm, we investigate the effects of motor rehabilitation by performing wide field cortical imaging while the animals execute a motor task on a robotic device. We investigate how light-stimulation moulds cortical maps, and compared it with remodelling induced by motor training. We analyse the spatio-temporal calcium dynamic and the reshaping of cortical activation area during the movement in a month. We then evaluated how the interhemispheric connectivity changes in response to the different rehabilitation approach. Our combination of techniques allows obtaining unprecedented views on cortical plasticity induced by rehabilitative therapies. Stroke Support: Health Research Council of New Zealand 14/136 Title: Does tonic inhibition in the sub-acute period after stroke alter the trajectory of upper limb recovery? The present study is examining primary motor cortex (M1) inhibition in patients over the first 12 weeks after stroke, and in a cohort of age-similar healthy controls. Upper limb impairment is assessed with Fugl-Meyer Upper Extremity Scale at 2, 6, 12 and 26 weeks after stroke. Similar to recent studies, patients with a functionally intact corticospinal pathway exhibit a proportional recovery such that upper limb impairment resolves by ~70% of the maximum possible. Patients with higher tonic inhibition in ipsilesional M1 tend to have a longer recovery period. These findings indicate that the ability to modulate tonic inhibition levels early after stroke may have implications for upper limb recovery during the spontaneous recovery period.

Left ventricular diastolic diameter may be reduced because of inability of the ventricle to fill properly anxiety uncertainty theory cheap bupropion 150mg with mastercard. Tamponade is accompanied by dilation of the hepatic veins bipolar depression 515163 cheap bupropion 150 mg amex, vena cavae bipolar depression 5dht generic bupropion 150mg on line, and early diastolic "collapse" of the right atrium and right ventricle mood disorder teens purchase bupropion with amex. In patients with purulent pericarditis, pericardiocentesis is indicated, since reaching an etiologic diagnosis is imperative so that appropriate antibiotic therapy can be initiated. Other than in patients with neoplasm and purulent pericarditis, the analysis of the fluid rarely yields a diagnosis. Pericardiocentesis is often indicated as an emergency procedure to treat the significant cardiac tamponade by removing fluid, thereby allowing adequate cardiac filling. At times, particularly with recurrent tamponade, a thoracotomy with creation of a pericardial window is indicated to decompress the pericardial sac. Pericardiectomy, removal of a large panel of the parietal pericardium, is sometimes performed, especially in purulent pericarditis, in the hopes of avoiding late restrictive pericarditis as the sac scars and contracts. Digoxin and diuretics are contraindicated because they slow the heart rate and reduce the filling pressure, contrary to the normal compensatory mechanisms for tamponade. High doses of antibiotics are indicated in purulent pericarditis, the type to be determined by antibiotic sensitivities, and open or closed drainage may be necessary. Appropriate cultures for mycobacteria and fungus should be performed, especially in immunocompromised patients. Skin tests for mycobacterial and fungus infection, with appropriate controls, may be helpful, especially if cultures prove negative. In patients with a primary inflammatory disorder, such as lupus, effective treatment of the underlying disorder with appropriate agents, such as steroids and other immunosuppressants, usually results in resolution of the pericarditis and effusion. Circulation, 116, 1736­1754; erratum in Circulation, 2007, 116, e376­e377;. Chapter 10 Abnormalities of heart rate and conduction in children Alterations in cardiac rate Atrial and atrioventricular arrhythmias Junctional arrhythmias Ventricular arrhythmias Conduction disturbances Shortened atrioventricular conduction (pre-excitation syndromes) Prolonged atrioventricular conduction General principles of tachyarrhythmia diagnosis and management Initial clinical assessment Differential diagnosis and management in stable patients Long-term management Additional reading 291 292 298 299 302 302 304 307 307 308 313 313 Disturbance of cardiac rate and conduction occur in children with no history of preceding cardiac disease, as a manifestation of congenital or acquired cardiac disease, as a complication of drug therapy, particularly digoxin therapy, or as a manifestation of metabolic, particularly electrolyte, abnormalities. Cardiac arrhythmias can be generally classified as (1) alterations in cardiac rate or (2) abnormalities of cardiac conduction. It describes the normal increase in cardiac rate with inspiration and the slowing with expiration. Sinus tachycardia the normal sinoatrial node can discharge at a rapid rate of up to 210 beats per minute (bpm) in response to some stimuli such as fever, shock, atropine, or Figure 10. The increased heart rate does not require treatment, but the tachycardia should be considered a clinical finding that requires diagnosis and perhaps treatment of the root cause. Distinguishing sinus tachycardia from a tachyarrhythmia In infants and children, the cardiac rate varies considerably and may reach 210 bpm during physical activity or with a high fever. Thus, it may be difficult to distinguish this from various types of tachyarrhythmia. In sinus tachycardia, the P-wave axis is normal (0­90), whereas in a tachyarrhythmia a normal P-wave axis is found in only 20%, or the P waves may not be visible at all. Tachycardia in the presence of sepsis, dehydration, or fever is almost always of sinus origin. Improvement following treatment of the underlying condition leads to slowing of the cardiac rate in sinus tachycardia. The history of onset and disappearance of the tachycardia differs between the two. When an effort is made to intervene by a vagal maneuver, if the tachycardia rate changes abruptly, its origin is tachyarrhythmia. Typically, a previously healthy infant develops poor feeding, sweating, irritability, and rapid respiration. If the arrhythmia is unrecognized and untreated, congestive cardiac failure may progress to death in 24­48 hours. The prognosis is excellent because many infants have no underlying cardiac malformation and recurrent episodes are rare or infrequent and are well tolerated, if of short duration. The mechanism of this type of tachycardia is virtually always re-entry via an accessory pathway between the atria and ventricles (Figure 10. Normally, only one electrically conductive pathway, the penetrating bundle of His, exists between the atria and ventricles. The tachycardia rate slows with age, being up to 300 bpm in neonates and 200 bpm in adolescents. On the electrocardiogram, the atrial activity does not appear as distinct P waves; instead, it has a sawtooth appearance (Figure 10.

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