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This is a blistering disease where the level of the blister is within the epidermis order cyklokapron 500 mg visa medicine glossary. The superficial nature of the blister means that the blisters are prone to burst leaving a glistening red base which bleeds easily buy cyklokapron without prescription symptoms of ebola. The epidermis at the edge of the blister is easily dislodged by sliding pressure (Nikolsky sign) cheap 500mg cyklokapron amex treatment with chemicals or drugs. Associated diseases include carcinoma, lymphoma, thymoma, systemic lupus erythematosus and certain drugs such as penicillamine and captopril. With the rectal bleeding and microcytic anaemia, it is likely that he has a left-sided colonic neoplasm. He needs an ultrasound to image his liver and a colonoscopy to visualize his colon. He should be referred to a surgeon to assess if pallia- tive surgery is appropriate. Pemphigus is itself life-threatening either due to insensible fluid losses or septicaemia as a result of infection of the exposed blisters. Treatment is with high doses of corticosteroids, and cytotoxic drugs may need to be added. Main differential diagnoses of blistering diseases • Pemphigoid: the level of bullae is deeper (subepidermal) and the blisters are larger and rupture less often than in pemphigus. He has had a sore throat for a few days and started developing pain in his back and arms which has increased in severity. Six hours prior to admission he suddenly developed right-sided chest pain which is worse on inspir- ation and associated with marked breathlessness. He has had previous episodes of pains affecting his fingers and back, for which he has taken codeine and ibuprofen. Sickle cell disease occurs mainly in African black populations and sporadically in the Mediterranean and Middle East. Haemoglobin S differs from haemoglobin A by the substitution of valine for glutamic acid at position 6 in the $-chain. Sickled cells have increased mechanical fragility and a shortened survival leading to a haemolytic anaemia, and also can block small vessels leading to tissue infarction. Sickle cell disease has a very variable clinical course due to a combination of reasons including the haemoglobin F (HbF) level and socio-economic factors. It usually presents in early childhood with anaemia and jaundice due to a chronic haemolytic anaemia, or painful hands and feet with inflammation of the fingers due to dactylitis. This patient is having a pulmonary crisis characterized by pleuritic chest pain, shortness of breath and hypoxia. It is usually precipitated by dehydration or infection (in this case, a sore throat). The principal differential diagnoses of a patient presenting with pleuritic pain and breath- lessness are pneumonia, pneumothorax and pulmonary emboli. Major potential complications of sickle cell disease • Thrombotic: causing generalized or localized bony pains, abdominal crises, chest crises, neurological signs or priapism. This patient should be admitted for rest, intravenous fluids, oxygen and adequate anal- gesia. The definitive investigation is haemoglobin electrophoresis which will demonstrate HbS, absent HbA and a variable HbF level. Partial exchange transfusion may be needed to reduce the level of his sickle cells to less than 30 per cent. He should be followed up by an expert sickle team since this has been shown to reduce admissions and improve quality of care. He may benefit from long-term hydroxyurea which raises the HbF level and reduces the number of crises. She has had the occasional episode of acute cystitis, approximately on a 2-yearly basis.
Prerenal failure Prerenal failure occurs where renal hypoperfusion causes failure of renal function buy cyklokapron 500 mg mastercard medicine grace potter. Children are especially prone to hypovolaemia from diarrhoea and vomiting (Stewart & Barnett 1997) order cyklokapron 500mg medicine 801. Since prerenal failure is caused by hypovolaemia rather than tubular damage purchase cyklokapron overnight delivery medicine questions, urinary sedimentation remains normal (Joynes 1996). As aldosterone increases renal reabsorption of sodium and water, urinary sodium can fall below 20 mmol/l (McHugh 1997), while urine osmolality rises (Joynes 1996). Intensive care nursing 314 In proportion to tissue weight, renal blood flow normally exceeds all other tissues except the carotid body (Ervine & Milroy 1997); however, renal tissue is especially susceptible to ischaemia. Damage to tubular epithelium from ischaemia causes cell dysfunction, allowing diffusion of filtered solute into interstitial tissue (Ervine & Milroy 1997). Intratubular accumulation of cellular debris further impairs tubular flow (Ervine & Milroy 1997), accelerating progression to intrarenal failure. Damage from nephrotoxicity is usually confined to epithelial layers; the epithelium readily regenerates, making recovery rapid (Carlson 1995). Ischaemia or inflammation damages deeper tissue; if basement membrane damage occurs, regeneration is unlikely, leading to chronic renal failure (Carlson 1995). Acute tubular necrosis used to be attributed to death of renal tubule cells, but pathology is more complex: while the problem is ‘acute’ and affects tubules, it is caused by ischaemia, rather than (necessarily) necrosis, of tubular cells. Hypoxia disrupts cell membranes (see Chapter 23) causing intracellular oedema and releasing vasoactive chemicals. Preglomerular vasoconstriction reduces glomerular perfusion, and so glomerular filtration. Widespread tubule intracellular oedema causes physical compression of lumens, obstructing flow of any filtrate produced. Medullary damage from intrarenal failure reduces sodium reabsorption in the Loop of Henle, so that urinary sodium levels are high (above 40 mmol/litre (McHugh 1997)). Hypernatraemia in the macula densa activates the renin-angiotensin-aldosterone cascade, further reducing glomerular blood flow and filtration. Intratubular sedimentation from cells rapidly obstructs flow, and the resulting retrograde pressure impedes filtration and can cause nephritis. Tubular cells readily regenerate so that renal replacement therapy buys time until recovery. However, as with other body tissue, reperfusion injury (see Chapter 23) from calcium and oxygen radicals can reverse recovery. Glomerulonephritis, inflammation of glomerular basement membrane, causes increased glomerular permeability. Large particles, such as erythrocytes and plasma proteins, may be filtered (Joynes 1996) or, with cellular debris, obstruct tubules, causing further back pressure (and damage) to glomeruli. Caused by obstruction between the kidneys and meatus (such as bladder tumours, renal/bladder calculi or an enlarged prostate), the resulting back pressure reduces filtration (Carlson 1995) and can cause intrarenal damage. As renal function fails, the volume of urine falls, while serum urea and creatinine levels rise. As damaged tubules begin to recover function and new (immature) tubule cells grow, filtration improves and obstruction to flow is removed. As selection tubular reabsorption of fluid and solutes is poor, large volumes of dilute urine are passed (up to 5 litres/day). Urea and creatinine levels fall, urine volumes return to normal, and electrolyte balance is restored. The main complications to body systems which result from renal failure are: Cardiovascular : ■ pericarditis ■ hyperkalaemia ■ acidosis ■ dysrhythmias ■ anaemia ■ hypertension (from renin) Nervous system : ■ confusion (from uraemia) ■ twitching ■ coma Intensive care nursing 316 Respiratory : ■ acidosis ■ pulmonary oedema ■ hiccough ■ compensatory tachypnoea Gut : ■ nausea ■ diarrhoea ■ vomiting Metabolic : ■ electrolyte disorders (see above) ■ toxicity from active drug metabolites ■ vitamin D deficiency Passively and actively, peritubular reabsorption of sodium in exchange for potassium and/or hydrogen ions maintains homeostasis, and so renal failure usually causes electrolyte imbalance: potassium : hyperkalaemia often occurs, although polyuria can cause hypokalaemia sodium : hyponatraemia may occur, especially with polyuric failure hydrogen : failure to excrete hydrogen ions causes metabolic acidosis Hypocalcaemia, hypophosphataemia and hypomagnesaemia can also occur (Carlson 1995). Many of these electrolytes affect cardiac and other muscle cell conduction so that dysrhythmias and generalised muscle twitching/weakness may occur. Muscle weakness will limit the effectiveness of patient-initiated breaths and weaning. Acid-base : normal renal function maintains acid-base balance by reabsorbing bicarbonate and excreting hydrogen atoms; urinary pH, normally about 5, can be as high as 8. Acidosis stimulates tachypnoea to compensate metabolic acidosis with respiratory alkalosis, but respiratory failure will limit effectiveness; excessive triggering (e. With nephritis, albumin is filtered due to: ■ loss of glomerular capillary negative charge ■ increased glomerular bed permeability (inflammatory response).
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Drug interactions • Generally increase the dose every two weeks until Carbamazepine should not be combined with monoamine either the seizures cease or signs of toxicity appear oxidase inhibitors cost of cyklokapron medications prescribed for migraines. It is a potent enzyme inducer and buy generic cyklokapron 500mg online 25 medications to know for nclex, in par- and/or the plasma drug concentration is in the toxic ticular cyklokapron 500 mg sale symptoms 39 weeks pregnant, it accelerates the metabolism of warfarin, theo- range. Sodium valproate (dipropylacetate) is effective against many forms of epilepsy, including tonic–clonic, absence, partial seizures and myoclonic epilepsy. It is the drug of choice for simple and complex enteric-coated tablets); partial seizures and for tonic–clonic seizures secondary to • enhancement of sedatives (including alcohol); a focal discharge seizure, and it is effective in trigeminal • hair loss (temporary); neuralgia and in the prophylaxis of mood swings in manic- • thrombocytopenia: platelet count should be checked depressive illness (see Chapter 20). A low starting dose before surgery or with abnormal bruising; is given twice daily followed by a slow increase in dose • a false-positive ketone test in urine; until seizures are controlled. Assays of serum concentration • teratogenic effects (neural-tube defects and hypospadias); are a useful guide to compliance, rapid metabolism or drug • hepatic necrosis, particularly in children taking high doses failure if seizures continue. The therapeutic range is and suffering from congenital metabolic disorders; 4–12mg/L. Pharmacokinetics Pharmacokinetics Carbamazepine is slowly but well absorbed following oral Valproate is well absorbed when given orally (95–100% administration. Plasma val- with adverse effects (dizziness, diplopia and drowsiness) that proate concentrations do not correlate closely with efficacy. There is increased perinatal mortality, raised frequency of cleft palate, hare lip, microcephaly and Phenytoin is effective in the treatment of tonic–clonic and par- congenital heart disease; tial seizures, including complex partial seizures. Dose individu- • effects on heart – too rapid intravenous injection causes alization is essential. Plasma concentration is measured after dysrhythmia and it is contraindicated in heart block two weeks. According to clinical response and plasma concen- unless paced; tration, adjustments should be small and no more frequent than • exacerbation of porphyria. Phenytoin illustrates the usefulness of therapeutic drug monitoring (see Chapter 8), but not all patients require a plasma phenytoin concentration within the Pharmacokinetics therapeutic range of 10–20mg/L for optimum control of their Intestinal absorption is variable. In status epilepticus, phenytoin may be given by slow handling of phenytoin and in patients taking the same dose, intravenous infusion diluted in sodium chloride. Fosphenytoin there is 50-fold variation in steady-state plasma concentra- is a more convenient parenteral preparation. Phenytoin metabolism is under poly- rhythmia and/or hypotension, so continuous monitoring (see genic control and varies widely between patients, accounting below) is needed throughout the infusion. Adverse effects Phenytoin is extensively metabolized by the liver and less These include the following: than 5% is excreted unchanged. The enzyme responsible for elimination becomes saturated at concentrations within the • effects on nervous system – high concentrations produce a therapeutic range, and phenytoin exhibits dose-dependent cerebellar syndrome (ataxia, nystagmus, intention tremor, kinetics (see Chapter 3) which, because of its low therapeutic dysarthria), involuntary movements and sedation. The clinical Seizures may paradoxically increase with phenytoin implications include: intoxication. High concentrations cause psychological disturbances; • Dosage increments should be small (50mg or less) once the • ‘allergic’ effects – rashes, drug fever and hepatitis may plasma concentration approaches the therapeutic range. Oddly, but importantly, such patients can show • Fluctuations above and below the therapeutic range occur cross-sensitivity to carbamazepine; relatively easily due to changes in the amount of drug • skin and collagen changes – coarse facial features, gum absorbed, or as a result of forgetting to take a tablet. The curves were fitted by computer assuming 0 100 200 300 400 500 600 Michaelis–Menten kinetics (Redrawn with permission from Richens A, Dunlop A. The time to approach a plateau plasma concen- plasma concentrations is less useful than with phenytoin tration is longer than is predicted from the t1/2 of a single dose because tolerance occurs, and the relationship between plasma of the drug. Intravenous phenytoin is irritant to veins and tissues phylaxis, folate deficiency, aplastic anaemia and congenital because of the high pH. Electrocardiographic monitoring with measurement of Use blood pressure every minute during administration is essen- Benzodiazepines (e. If blood pressure falls, administration is temporarily have anticonvulsant properties in addition to their anxiolytic stopped until the blood pressure has risen to a satisfactory and other actions. Clonazepam was introduced specifically as more rapidly, but still requires careful monitoring. At therapeutic concentrations, 90% of phenytoin is bound Clonazepam has a wide spectrum of activity, having a place to albumin and to two α-globulins which also bind thyroxine. It is also useful in complex binding results in lower total plasma concentration and a partial seizures and myoclonic epilepsy in patients who are lower therapeutic range (see Chapter 3).
Most deaths are associated with asphyxia as a result and Emergency Department unconscious buy cyklokapron now symptoms meaning. Excessive believe that he ingested condoms full of diamorphine prior to his arrest following a drugs raid buy cyklokapron overnight treatment for shingles. He had been in police chronic use is rare cheap cyklokapron 500mg line symptoms 6 days post embryo transfer, but may lead to major organ failure, as custody for approximately one hour. There are no specific drug centrally cyanosed, breathing irregularly, with pinpoint therapies for solvent abusers and psychological and/or social pupils and no response to painful stimuli. Most synthetic anabolic steroids are derived Answer 2 Since naloxone is an effective antidote to diamorphine poi- from testosterone and are popular among body builders. The soning, close observation with repeated injections or infu- prevalence of anabolic steroid abuse among athletes is uncer- sion of naloxone, inhaled oxygen and bulk laxatives should tain. A handbook of drug and alcohol cal pharmacology of 3, 4-methylenedioxymethamphetamine. Self-poisoning creates 10% of the workload of Accident and The effects may be delayed. This list of agents that cause death from overdose does not testing) and biochemical determination of plasma electrolytes, reflect the drugs on which individuals most commonly over- Table 54. Benzodiazepines (often taken with alcohol) are commonly Symptoms/signs of Common poisons taken in an overdose, but are seldom fatal if taken in isolation. The majority of cases of self-poisoning fall into the psycho- logical classification of suicidal gestures (or a cry for help). Coma, pinpoint pupils, Opioids However, the prescription of potent drugs with a low therapeu- hypoventilation tic ratio can cause death from an apparently trivial overdose. Following an immediate assessment of vital functions, as oxidase inhibitors, mefenamic full a history as possible should be obtained from the patient, rel- acid, theophylline, atives, companions and ambulance drivers, as appropriate. A hypoglycaemic agents, lithium, knowledge of the drugs or chemicals that were available to the cyanide patient is invaluable. A psychiatric history, particularly of depressive ill- Tinnitus, overbreathing, Salicylates ness, previous suicide attempts or drug dependency, is relevant. If the patient is unconscious, protect airway with cuffed Suspected overdose Effect on management endotracheal tube. If semiconscious with effective gag reflex, Paracetamol Administration of antidotes – place the patient in the head-down, left-lateral position. An acetylcysteine or methionine anaesthetist with effective suction must be present Iron Administration of antidote – 2. Place the patient’s head over the end/side of the bed, so that desferrioxamine their mouth is below their larynx Methanol/ethylene glycol Administration of antidote – 3. Confirm that the tube is in the stomach (not the trachea) by without dialysis auscultation of blowing air into the stomach; save the first Lithium Dialysis sample of aspirate for possible future toxicological analysis Salicylates Simple rehydration or alkaline (and possible direct identification of tablets/capsules) diuresis or dialysis 5. Use 300 –600mL of tap water for each wash and repeat three Theophylline Necessity for intensive care unit to four times. Unless an oral antidote is to be administered, leave 50g of urea, creatinine, oxygen saturation and arterial blood gases. In these, emergency measurement An increasingly popular method of reducing drug/toxin of the plasma concentration can lead to life-saving treatment. To be effective, large amounts of char- overdoses are often asymptomatic, and although it only rarely coal are required, typically ten times the amount of poison causes coma acutely, patients may have combined paracetamol ingested, and again timing is critical, with maximum effec- with alcohol, a hypnosedative or an opioid. Its effectiveness tive antidote (acetylcysteine) is available, it is recommended is due to its large surface area ( 1000m2/g). Binding of char- that the paracetamol concentration should be measured in all coal to the drug is by non-specific adsorption. Oral charcoal may also inactivate any coma, samples of blood, urine and (when available) gastric oral antidote (e. Subsequent toxicological screen- The use of repeated doses of activated charcoal may be ing may be necessary if the cause of the coma does not become indicated after ingestion of sustained-release medications or apparent or recovery does not occur. Avoidable morbidity is drugs with a relatively small volume of distribution, and pro- more commonly due to a missed diagnosis, such as head longed elimination half-life (e.