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The sympathetic system is depressed to a greater extent than the parasympathetic system symptoms graves disease lamictal 100mg for sale, and this can result in bradycardia symptoms vertigo buy lamictal 25 mg fast delivery. If opioids are also administered medicine effexor cheap 50mg lamictal free shipping, as with other agents medicine zantac lamictal 50 mg with amex, the respiratory depression is more marked. It is a relatively safe anaesthetic from the viewpoint of acute cardiorespiratory effects since, unlike other intravenous anaesthetics, it is a respiratory and cardiac stimulant. Because of its ease of administration and safety, its use is widespread in countries where there are few skilled anaesthetists. It has been used for management of mass casualties or for anaesthesia of trapped patients to carry out amputations, etc. It is used in shocked patients, because unlike other intravenous anaesthetics it raises rather than lowers blood pressure. There is a high incidence of hallucinations, nightmares and transient psychotic effects. Children cannot articulate such symptoms and it is disturbing that it is still used particularly in this age group. It has a more rapid onset of action than diazepam and a shorter duration of action, with a plasma half-life of 1. Midazolam causes amnesia, which is useful for procedures such as endoscopy or dentistry. The use of benzodiazepines for induction of anaesthesia is usually confined to slow induction of poor-risk patients. Prior administration of a small dose of midazolam decreases the dose of intravenous anaesthetic required for induction. Diazepam is used for premedication (oral), sedation (by slow intravenous injection) and as an anticonvulsant (intravenously). A preparation formulated as an emulsion in soyabean oil has reduced thrombophlebitis from intravenous diazepam. Its use has declined because it causes pain on injection, nausea and vomiting, and excitatory phenomena including extraneous muscle movements. Etomidate can suppress synthesis of cortisol (see below) and it should not be used for maintenance of anaesthesia. Addition of a small dose of volatile anaesthetic, benzodiazepine or propofol is required to avoid awareness during anaesthesia. High-dose opioids can cause chest wall rigidity interfering with mechanical ventilation. Particular care should be taken after multiple injections because of saturation of tissue stores. Fentanyl and the other potent opioids must not be used in situations where ventilation cannot be controlled. Neuroleptanalgesia is produced by a combination of a butyrophenone (droperidol) and an opioid (fentanyl). It is a state of inactivity and reduced response to external stimuli, sometimes used for complex diagnostic procedures. It has a short duration of action of five to ten minutes, and is often used as an infusion, but causes marked respiratory depression for some minutes. It has an ester linkage, making it susceptible to rapid hydrolysis by a number of non-specific esterases in blood and tissues. It is administered as an infusion and does not accumulate even after a three-hour infusion. It is a useful adjunct to anaesthetics, particularly in patients with renal or hepatic impairment. Most sedative and analgesic drugs are given by continuous intravenous infusion both for convenience of administration and for control. They also suppress the cough reflex and are respiratory depressants, which is useful in ventilated patients. Monitoring the level of sedation is particularly important in cases where long-acting opioids or benzodiazepines are being used whose action may be prolonged due to accumulation of drug and active metabolites. Propofol is increasingly used where shortterm sedation or regular assessment is required, because its lack of accumulation results in rapid recovery. Etomidate was used for intensive care sedation before it was shown to increase mortality by adrenocortical suppression. Inhalational agents, such as isoflurane, have also been successfully used to provide sedation. Occasionally, muscle relaxants are indicated in critically ill patients to facilitate ventilation. Atracurium is then the drug of choice and sedation must be adequate to avoid awareness. Modern induction methods are simple and not unpleasant, and the chief aim of premedication is now to allay anxiety in the patient awaiting surgery.
In addition medications xr discount 25 mg lamictal mastercard, other nonlethal arrhythmias medications like zovirax and valtrex discount 100mg lamictal otc, such as atrial fibrillation 911 treatment center discount lamictal 200 mg on-line, also are more prevalent in these patients medications vascular dementia discount 100mg lamictal with visa. Evaluation and treatment of symptoms of a suspected arrhythmia are therefore different in patients with and without structural heart disease. A 25-year-old patient without any known prior cardiac disease presents with a 3-month history of intermittent palpitations, which occur every few weeks, persist for up to about 5 minutes, and spontaneously resolve. On occasion they are accompanied by dizziness, and on a recent episode he had a syncopal episode. What would be the most appropriate first test to obtain for him in the evaluation of his symptoms A complete blood count and electrolyte panel Answer: C See Diagnostic Tests: Electrocardiography. However, because the symptoms do not occur every day, a 24-hour Holter monitor is unlikely to capture the rhythm during his symptoms. What type of ambulatory monitoring would be most appropriate for a patient who has intermittent palpitations that occur every 1 to 2 weeks A wearable defibrillator vest Answer: D See Diagnostic Tests: Ambulatory Monitoring. Because the symptoms occur less frequently than daily, it is very unlikely that a 24- or 48-hour Holter monitor will detect an event. A wearable event monitor, which can be worn for 3 to 4 weeks, is likely to capture an event. Although an implantable loop recorder would likely capture an event, it is inappropriate in this setting because of its expense and invasive nature. A wearable defibrillator vest is not necessary because the patient has not had a cardiac arrest. When a patient presents in a narrow complex tachycardia, which of the following is the most useful diagnostic test Adenosine is useful for narrow complex tachycardias both diagnostically and therapeutically. An echocardiogram might be useful in excluding valvular or structural heart disease, depending on the history and physical examination, but it does not need to be performed during the tachycardia. What features from the history are most important in distinguishing neurocardiogenic syncope from seizure disorder A, C, and D Answer: E See Table 62-2 and Neurocardiogenic Syncope and Related Syndromes. Because neurocardiogenic syncope commonly presents in young, otherwise healthy individuals, the differential diagnosis often involves a new seizure disorder. Several important historical features and the appearance of the patient during the syncopal episode (when observed by a bystander) can be very useful in distinguishing neurocardiogenic syncope from a seizure disorder. Jerking movements of the limbs can be confused with myoclonic movements that are common in neurocardiogenic syncope, so these movements are not helpful in distinguishing between seizure disorder and neurocardiogenic syncope. Although seizure disorders can sometimes be associated with prodromes, they commonly involve sensory auras. Neurocardiogenic syncope often is preceded by reproducible prodromes of nausea and sweatiness, which are triggered by the heightened parasympathetic tone that causes the acute drop in blood pressure and heart rate and which can persist after the episode. Over the past two decades, however, asystole and pulseless electrical activity have now become the first recorded rhythm in the majority of both in-hospital and out-of-hospital cases. Pulseless electrical activity is defined as primary when it is the initial rhythm noted in patients with predisposing cardiac disorders and as secondary when it occurs in the setting of noncardiac predisposing factors, such as hypoxia, metabolic disorders, massive pulmonary embolism, or blood loss. The absence of a pulse in conjunction with no respiratory efforts or only gasping or agonal respirations is diagnostic of cardiac arrest. Although the absence of a carotid or femoral pulse is a primary diagnostic criterion for the health care professional, palpation for a pulse is no longer recommended for lay responders. In the latter circumstance, initial efforts should include oropharyngeal exploration in search of a foreign body and the Heimlich maneuver, which entails wrapping the arms around the victim from the back and delivering a sharp thrust to the upper part of the abdomen with a closed fist, particularly in a setting in which aspiration is likely. If not treated promptly, it will lead to central nervous system injury or death within minutes. Sudden cardiac arrest is often forewarned by a change in cardiovascular status, as indicated by the onset or worsening of symptoms related to transient arrhythmias, such as palpitations, lightheadedness, or near-syncope or syncope (Chapter 62). Patients with advanced ischemic and nonischemic cardiomyopathies (Chapter 60), heart failure (Chapters 58 and 59), and certain acquired and inherited arrhythmia syndromes (Chapters 64 and 65) have an increased risk for sudden cardiac arrest. However, most sudden cardiac arrests occur either as a first cardiac event in an apparently healthy individual with unrecognized disease or in patients known to be low risk. The incidence in the general population over the age of 35 years ranges from 1 to 2 per 1000 per year. In addition, competitive and high-intensity recreational athletes have a low but finite increase in risk for sudden cardiac arrest during training or competition,1 with estimates ranging from 1 in 75,000 to 1 in 200,000. These risks are higher in males and in association with specific sports, such as basketball and football in the United States and cycling, jogging, and soccer in Europe. A continuous rhythm strip should be recorded during administration of adenosine or performance of vagal maneuvers because characterizing transient changes on a monitor screen may be unreliable. Bothhavelong-termprognostic implications in patients with advanced structural heartdisease,butmonomorphicpatternstendtobemorestableovertheshortterm. When the person at the scene has insufficient physical strength to perform the maneuver, mechanical dislodgement of a foreign body can sometimes be achieved by abdominal thrusts with the unconscious patient in a supine position. If there is suspicion that respiratory arrest precipitated the cardiac arrest, particularly in the presence of a mechanical airway obstruction, a second precordial thump should be delivered after the airway has been cleared.
The majority of cases of self-poisoning fall into the psychological classification of suicidal gestures (or a cry for help) symptoms 3 months pregnant purchase lamictal 50 mg without a prescription. However medications during breastfeeding discount 25mg lamictal, the prescription of potent drugs with a low therapeutic ratio can cause death from an apparently trivial overdose medications used for anxiety purchase genuine lamictal online. Following an immediate assessment of vital functions symptoms ibs buy lamictal 100 mg amex, as full a history as possible should be obtained from the patient, relatives, companions and ambulance drivers, as appropriate. A knowledge of the drugs or chemicals that were available to the patient is invaluable. A psychiatric history, particularly of depressive illness, previous suicide attempts or drug dependency, is relevant. If semiconscious with effective gag reflex, place the patient in the head-down, left-lateral position. Confirm that the tube is in the stomach (not the trachea) by auscultation of blowing air into the stomach; save the first sample of aspirate for possible future toxicological analysis (and possible direct identification of tablets/capsules) 5. Drug screens are often requested, although they are rarely indicated as an emergency. In these, emergency measurement of the plasma concentration can lead to life-saving treatment. For example, in the early stages, patients with paracetamol overdoses are often asymptomatic, and although it only rarely causes coma acutely, patients may have combined paracetamol with alcohol, a hypnosedative or an opioid. As such, an effective antidote (acetylcysteine) is available, it is recommended that the paracetamol concentration should be measured in all unconscious patients who present as cases of drug overdose. When there is doubt about the diagnosis, especially in coma, samples of blood, urine and (when available) gastric aspirate should be collected. Subsequent toxicological screening may be necessary if the cause of the coma does not become apparent or recovery does not occur. Avoidable morbidity is more commonly due to a missed diagnosis, such as head injury, than to failure to diagnose drug-induced coma. Gastric aspiration and lavage should only be performed if the patient presents within one hour of ingestion of a potentially fatal overdose. If there is any suppression of the gag reflex, a cuffed endotracheal tube is mandatory. It should only be performed by experienced personnel with efficient suction apparatus close at hand (see Table 54. If the patient is uncooperative and refuses to give consent, this procedure cannot be performed. Gastric lavage is usually contraindicated following ingestion of corrosives and acids, due to the risk of oesophageal perforation and following ingestion of hydrocarbons, such as white spirit and petrol, due to the risk of aspiration pneumonia. An increasingly popular method of reducing drug/toxin absorption is by means of oral activated charcoal, which adsorbs drug in the gut. To be effective, large amounts of charcoal are required, typically ten times the amount of poison ingested, and again timing is critical, with maximum effectiveness being obtained soon after ingestion. Aspiration is a potential risk in a patient who subsequently loses consciousness or fits and vomits. The use of repeated doses of activated charcoal may be indicated after ingestion of sustained-release medications or drugs with a relatively small volume of distribution, and prolonged elimination half-life. The rationale is that these drugs will diffuse passively from the bloodstream if charcoal is present in sufficient amounts in the gut or to trap drug that has been eliminated in bile from being re-absorbed (see below). Whole bowel irrigation using non-absorbable polyethylene glycol solution may be useful when large amounts of sustained-release preparations, iron or lithium tablets or packets of smuggled narcotics have been taken. This is usually due to peripheral vasodilatation, but may be secondary to myocardial depression following, for example, -blocker, tricyclic antidepressant or dextropropoxyphine poisoning. If dysrhythmias occur any hypoxia or hypokalaemia should be corrected, but anti-dysrhythmic drugs should only be administered in life-threatening situations. Since the underlying cardiac tissue is usually healthy (unlike cardiac arrests following myocardial infarction), prolonged external cardiopulmonary resuscitation whilst the toxic drug is excreted is indicated. Serial minute volume measurements or continuous measurement of oxygen saturation using a pulse oximeter are also helpful for monitoring deterioration or improvement in self-ventilation. In addition, exchange transfusion has been successfully used in the treatment of poisoning in young children and infants. The risk of an elimination technique must be balanced against the possible benefit of enhanced elimination. It rapidly reverses the effects of opioid drugs, including morphine, diamorphine, pethidine, dextropropoxyphene and codeine. When injected intravenously, naloxone acts within two minutes and its elimination half-life is approximately one hour. This is not a contraindication, but it is wise to ensure that patients are appropriately restrained if this is a risk. Several drugs are eliminated in the bile and then reabsorbed in the small intestine. Activated charcoal can interrupt this enterohepatic circulation by adsorbing drug in the gut lumen, thereby preventing reabsorption and enhancing faecal elimination. Cathartics, such as magnesium sulphate, can accelerate the intestinal transit time, which facilitates the process. Orally administered activated charcoal adsorbs drug in the gut lumen and effectively leaches drug from the intestinal circulation into the gut lumen down a diffusion gradient.
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Skin:- Chloroquine and phenothiazines accumulate in skin by interacting with melanin symptoms of dehydration generic 200 mg lamictal. Hairs:- Arsenicals symptoms week by week generic 100mg lamictal with amex, chloroquine and phenothiazines are reported to deposit in hair shafts medicine 035 order lamictal 100 mg on-line. Bones:- Tetracycline is a well known example of a drug that binds to bones and teeth medicine 0025-7974 order lamictal amex. Administration of this antibiotic to infants or children during odontogenesis results in permanent brown yellow discoloration of teeth. Receptors have stated that adipose localization of drugs is a result of binding competition between adipose and non adipose tissue (lean tissues like muscles, skin and viscera) and not partitioning. Physiochemical properties of drug a) Particle size b) Aqueous/lipid solubility c) pKa value of drug d) Diffusion of drug e) Ph f) Mass 2. Pharmaceutical factor a) Lipid: water partition b) Drug interaction c) Coefficient of the drug d) Binding of drug to blood components 3. Biological factors a) Organ/tissue size b) Age c) Diet d) Obesity e) Pregnancy f) Degree of plasma protein binding g) Fat lean body mass ratio h) Disease state Ka = 3. Biotransformation means the chemical processes in living things that change food or other substances into energy and materials for growth and other effect. It is a chemical alteration or change of the drug in the body from one phase to another phase. It is needed to render nonpolar (lipid soluble) compounds polar (lipid insoluble) so that they are not reabsorbed in the renal tubules and are excreted. The primary site for drug metabolism is liver, other are- lungs, kidney, intestine, skin and plasma. Inactivation:Most drugs and their active metabolites are rendered inactive or less active. Activation of inactive drug:Few drugs are inactive as such and required conversion in the body to one or more active metabolites. The prodrug may offer advantages over the active form in being more stable, having better bioavailability or other desirable pharmacokinetic properties or less side effects and toxicity. Microsomal enzymes:- these are located on smooth endoplasmic reticulum, attached with inside the cell and present in liver, kidney, intestine, mucosa and lungs. They catalyse most of the oxidation, reduction, hydrolysis and Glucuronide conjugation. Non-microsomal enzymes:- these are present in the cytoplasm and mitochondria of hepatic (liver) cell as well as in other tissues including plasma. The flavor-protein oxidases, esterases, amidases and conjugases are non-microsomal. Biotransformation reactions can be classified or categorized into: According to R. Phase I /Non-synthetic/ Functionalization reaction:A functional group is generated or exposed; metabolite may be active or inactive. Oxidation:This reaction involves addition of oxygen (negatively charged radical) or removal of hydrogen (positively charged radical). Oxidative reactions are mostly carried out by a group of aromatic, olefins, allylic, aliphatic and alicylic compounds. Reduction:This reaction is the converse of oxidation and involves cytochrome P-450 enzymes working in the opposite direction. Alcohols, carbonyl, aldehydes, quinones are reduced drugs Hydrolysis:This is cleavage of drug molecule by taking up a molecule of water. Examples of hydrolysed drugs are choline esters, amides, procaine, lidocaine, procainamide, aspirin, carbamazepine-epoxide, pethidine, oxytocin. Ester + H2O Acid + Alcohol 21 Basic Concepts in Pharmacology Pharmacokinetics (Pharmacon- Drug, Kinesis- Movement/motion) Cyclization:This is formation of ring structure from a straight chain compound. Decyclization:This is opening up of ring structure of the cyclic drug molecule. These involve conjugation of the drug or its phase-I metabolite with an endogenous substrate, usually derived from carbohydrate or amino acid, to form a polar highly ionized organic acid, which is easily excreted in urine or bile. Compounds with a hydroxyl or carboxylic acid group are easily conjugated with glucuronic acid which is derived from glucose. Examples are- chloramphenicol, aspirin, paracetamol, diazepam, lorazepam, morphine and metronidazole. Acetylation:Compounds having amino or hydrazine residues are conjugated with the help of acetyl coenzyme-A. Sulfate conjugation:The phenolic compounds and steroids are sulfated chloramphenicol, methyldopa, adrenal and sex steroids. Glycine conjugation:Salicylates, nicotinic acid and other drugs having carboxylic acid group are conjugated with glycine, but this is not a major pathway of metabolism. Ribonucleoside/nucleotide:This pathway is important for the activation of many purine and pyrimidine antimetabolites used in cancer chemotherapy. S-warfarin rapidly undergoes ring oxidation, while R-warfarin is slowly degraded by side chain reduction. However, it serves to inactivate highly reactive quinone or epoxide intermediates formed during metabolism of certain drugs. When large amount of such intermediates are formed (in poisoning or after enzyme induction), glutathione supply falls short-toxic adducts are formed with tissue constituents tissue damage. Physiochemical properties of drugs a) Induction & inhibition of drug metabolizing enzymes b) Environmental chemicals 2. Biological factors a) b) c) d) e) f) g) h) Species differences Strain differences Sex differences Age Diet Pregnancy Hormonal imbalance Disease states 23 Basic Concepts in Pharmacology Pharmacokinetics (Pharmacon- Drug, Kinesis- Movement/motion) 3. Nephron is a coil like cell present in kidney, which are filtered the blood and separate the water and blood through tubular cell. Drugs and their metabolites are removed from the body is called excretion or it is an irreversible loss of drug from body, where the drug metabolites transfer from internal to external environment.