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Volume Volume 14, 12, Issue Issue 62 PHARM NOTES November/December 2011 Neil Medical Group: The Leading Pharmacy Provider in the Southeast Neil Medical Group: The Leading Trigeminal Neuralgia Background Trigeminal neuralgia, also known as Tic Douloureux, is an extreme burning, shock like pain in the face. The trigeminal nerve is the nerve that is affected which branches into 3 different parts that link the brain to the face. Upper part (ophthalmic) links the brain to the scalp and forehead, while the middle branch (maxillary) connects the teeth, gums, upper jaw, nose, and top lip. The lower branch (mandibular) connects the lower jaw, teeth, bottom lip and gums. The pain typically is located in the lips, gums, cheek, or chin and rarely in the ophthalmic branch. In most cases, the pain will be one-sided; however, it may present on both sides, but not usually at the same time. The pain may last from several seconds to a minute or two. Despite the short time length, the pain is very intense with co-morbidities including depression and anxiety due to anticipation of a recurrence. Facial spasms may also occur. The pain will typically recur in clusters throughout the day for weeks at a time with patients having no pain between episodes. The pain may subside and not recur for months to years at a time. Pharmacological Treatment Carbamazepine is the treatment of choice and is the only drug that is indicated for trigeminal neuralgia. It is effective in nearly 50-75% of patients with a total of 88% having a reduction in attacks by more than 50%. There is an increased risk for adverse effects which include: dizziness, giddiness, unsteadiness, sedation and somnolence. Rare cases of agranulocytosis have also been reported. Oxcarbazepine is similar to carbamazepine and due to fewer side effects, may be used more often. It has shown equal efficacy in one clinical trial. Measuring the efficacy of carbamazepine and oxcarbazepine is limited due to the significance of adverse effects and drug interactions. Taper should be attempted after 1 to 3 months. Several other medications are used for the treatment of trigeminal neuralgia, but efficacy is uncertain and more studies are needed to determine their place in therapy. Various other anticonvulsants are often used in the treatment of trigeminal neuralgia (phenytoin, clonazepam, lamotrigine, valproic acid, and gabapentin) though there are no large scale controlled trials that show efficacy. Baclofen, a skeletal muscle relaxant, may be useful but is not indicated for this condition. It may be used along with carbamazepine and effects may be synergistic. Although carbamazepine is typically used first, some prefer to use baclofen first due to fewer side effects. There are trigger zones that can cause an attack which can generate immense pain. These zones can be triggered by light touch or vibration, and this can prevent a patient from allowing a full physical exam due to the anticipation of pain. The physical examination should come back normal with no signs of sensory loss. Pimozide may be more effective then carbamazepine but has only been studied in a single cross over trial. This medication is not often used due to its side effect profile. These Causes side effects include: hand tremors, memory impairment, and involunThe cause of trigeminal neuralgia is not known, but there are several tary movement. There have been few trials studying antidepressants theories. The common opinion is that the pain is caused when the and neuropathic pain, and few patients that have been studied with nerve is pinched or damaged (blood vessel, lesions or tumor). Dental trigeminal neuralgia. Amitriptyline has the most supporting evidence fillings in the nearby area can also cause attacks. Age related brain with 3 out of 9 patients experiencing at least moderate relief. changes and increased thickness of vasculature are other suggested Continued on page 5 causes. Many times the cause is unknown. Inside This Issue: Page 2 Page 3 Page 4 Page 5 Pages 6 Page 7 Page 8 Trigeminal Neuralgia Let’s Talk TSH! Artificial Sweeteners & Weight Loss Supplements to Prevent UTI’s Conclusion: Trigeminal Neuralgia Tardive Dyskinesia Medical Calculations Quiz NMG Contact Information Let’s Talk TSH! One of the most confusing labs we often review is TSH. TSH is the acronym for Thyroid Stimulating Hormone. It is produced in response to the function of the thyroid gland and the possible need for thyroid supplementation. What makes this lab confusing is the thought process required for us to use as we review the lab results. With most all other labs, when the value is below normal limits, we immediately know that a dose increase will be necessary to get the medication to a therapeutic level for the resident. Likewise if the value is above normal limits, we would expect a dosage reduction would be ordered. Thus low labs are considered “hypo” while high labs are considered “hyper” supplementation. The purpose of the TSH is to “stimulate” the thyroid gland to “work harder”. Thus, an elevated TSH indicates the thyroid is low while a low TSH indicates the thyroid is too high. With that in mind, when it comes to reviewing TSH labs we must reverse our thinking since the logic for considering a dosage increase or decrease is exactly opposite from what we would normally do with common labs such as potassium, digoxin, magnesium and Vit D. It is very easy to increase the levothroid supplementation when an actual dose decrease should have occurred. It is most important that any time there is a change in thyroid dosage, that all health care providers (Prescribers, Nurses and Pharmacists) take a moment and double check the order for validity. Excessive thyroid supplementation can lead to tachycardia, increased BP and increased anxiety while under supplementation would have the opposite effect. This is why we take the pulse at least weekly with thyroid supplementation – to make sure we are not giving the resident a medication that is worsening his/her clinical condition. Here is a clinical pearl that will provide you with an easy way to remember whether a thyroid dose increase, no change, or a decrease would be clinically appropriate when reviewing TSH lab results: “The direction the TSH is going is the direction the dose needs to be going.” To put this in practical terms, if the TSH is high, the thyroid dose needs to be higher because this is Hypothyroidism. Strange to increase a dose when the lab is high? Remember the logic with reading TSH labs is the opposite of our other lab results. High TSH lab results indicate hypo. If the TSH is low, the dose needs to be lower because this is Hyperthyroidism. If the TSH is WNL then no dosage change is needed. Let’s look at some examples and apply the clinical pearl Let’s say normal TSH lab values are 0.5 to 4.5. Review the following scenarios to determine whether: A) the diagnosis should be Hypo- or Hyper- thyroid, and B) a dose increase, no change or dose decrease would be appropriate. Example #1: TSH 12.5 Hypo or Hyperthyroid? Dose Increase, No Change, Dose Decrease? Example #2: TSH= 0.1 Hypo or Hyperthyroid? Dose Increase, No Change, Dose Decrease? Example #3: TSH=3 Hypo or Hyperthyroid? Dose Increase, No Change, Dose Decrease? Example #4: TSH=4.6 Hypo or Hyperthyroid? Dose Increase, No Change, Dose Decrease? Example #1 the TSH is HIGH →Hypothyroidism. Since the TSH is high, supplementation would need to be higher. Thyroid dose increases should be done very gradually so this is why we normally see daily increases of only 25 mcg (micrograms). TSH lab would need to be rechecked in 6-8 weeks to monitor this dosage increase. Example #2, TSH is LOW →Hyperthyroidism. Since TSH is low, supplementation would need to be lowered. Likewise, we would expect the dose to be decreased by 25 mcg and repeat TSH lab in 6-8 weeks. Example #3, TSH is WNL so no dosage change would be needed. TSH lab would be repeated in a year or per facility lab protocol. Example#4, TSH is only slightly elevated. While the dose could be increased, most likely no dosage change would occur especially in our elderly population. Hope this clinical pearl helps you the next time you review a TSH lab. If TSH is high, increase the dose. If TSH is low, decrease the dose. If WNL, no dosage adjustment would be necessary. Happy TSHing! Article by Andy Hunter, RPh; Consultant Pharmacist Neil Medical Group Page 2 Neil Medical Group – Pharmacy Services Division Artificial Sweeteners and Weight Loss In their efforts to lose weight, individuals frequently consume products containing non-nutritive sweeteners. The US Food and Drug Administration (FDA) granted approval for five such sweeteners: saccharin, aspartame, sucralose, acesulfame, and neotame. In addition, stevia, an herbal intense sweetener, has recently emerged in the U.S. marketplace. Each of these sweeteners is many times sweeter than sucrose or table sugar. For this reason, their caloric contribution is minimal. The issue is whether consuming artificially sweetened products helps people lose weight. partame or sucrose pre-prandially (before a meal) enhanced human appetite. The second avenue of inquiry expands on the mechanistic way the human palate perceives sweetness to its impact on the desirability of food and the behaviors associated with this perception. Inescapable from this examination is the understanding that, other motivations aside, people tend to consume greater quantities of food that tastes better to them. David Benton says that the difficulty in assessing this relationship reflects that “in reality it is rarely possible to disassociate energy density and palatability; attempts to do this have varied energy density over a very limited range.” Furthermore, individuals who realize that they are consuming aspartame are likely to consciously increase their caloric intake, “suggesting overcompensation for the expected caloric reduction.” Given the complexities of consumption patterns and motivations, researchers have yet to design and implement a prospective randomized, controlled trial reflecting the The rationale behind substituting a non-nutritive sweetmultivariate nature of the physiological and behavioral ener for higher calorie sucrose and high fructose corn influences quantifying the impact of non-nutritive sweetsyrup is mathematically simple and appealing: a reduceners on weight loss and applicable to the general popution in approximately thirty kilocalories per teaspoonful. lation. Using a practical example of this logic, an individual who normally consumes two sugar sweetened soft drinks daily at 150 kilocalories each could lose almost one pound weekly just by substituting two zero calorie soft drinks. As appealing and straightforward as this sounds, research reveals a much more complex picture. In fact, some studies have even indicated some level of correlation between artificial sweetener use and weight gain. Many hypotheses have been generated to explain the equivocal nature of conclusions regarding the impact of non-nutritive sweeteners on weight loss or gain. The scientific literature on the topic of sweetness, satiety and energy intake is split. The more fundamental area of research focuses on the qualitative differential physiological reaction of the brain and the digestive system to nutritive and non-nutritive sweeteners. The question for researchers is whether consumption of foods perceived as sweet but lacking in the caloric content of natural sugars activate compensatory mechanisms resulting in an unconscious physiological stimulus to increase consumption to make up a perceived deficit. According to Yang, experiments providing asNeil Medical Group – Pharmacy Services Division By Gus Hodges, Pharm D Candidate Page 3 Supplements to Prevent UTI’s For many years various supplements have been used in the attempt to prevent recurrent urinary tract infections (UTI). This is a brief review of the current literature that supports (or lack of support) the use of these agents. Multiple factors predispose the elderly to frequent UTIs including hormonal changes, other medical conditions, medication use, urinary incontinence, fecal incontinence, and poor perineal hygiene. It should be noted that asymptomatic bacteriuria in the elderly usually does not require treatment. In nursing homes, it is estimated that 20-50% of residents without urinary catheters and almost 100% or residents with urinary catheters have bacteriuria. Therefore, urinalysis should generally only be done when the resident has symptoms of UTI, and treatment should be reserved for symptomatic residents in order to prevent bacterial resistance to antibiotics. Based on the high number of UTIs that do occur, some providers start various treatments to reduce the frequency of UTIs. Vitamin C The theory behind the use of Vitamin C/ascorbic acid to prevent UTIs is based on acidifying the urine. One theory is that with acidification, nitrite results in the formation of nitric oxide which is toxic to some bacteria. A review of the literature for clinical trials to support the efficacy of Vitamin C for the prevention of UTIs yielded no good clinical trials showing Vitamin C to be an effective preventative. So despite the fact that Vitamin C is often being given for the prevention of UTIs, there is little objective clinical data to prove efficacy. Cranberry Cranberry, especially concentrated formulations, has been proposed to prevent UTIs for many years. The theory behind the efficacy is that cranberry prevents the adhesion of bacteria to the epithelial lining of the bladder and therefore prevents infection. There is also vitamin C in cranberry extracts resulting in the acidification of the urine. A new product UTI-STAT, which is a concentrated cranberry liquid blend, is currently being marketed to LTC facilities for the prevention of UTIs. The available study for the claim of reduced UTIs is based on 23 females with an average age of 46.5 years old taking 60 ml daily for 12 weeks. There was no control group for comparison, only a comparison to historical UTI rates. Therefore, it is unknown if this product will be effective for LTC facility populations. Methenamine Methenamine salts are often used for UTI prevention. According to Clinical Pharmacology, “In an acidic environment, methenamine is hydrolyzed to ammonia and to formaldehyde. The amount of formaldehyde released is directly proportional to the pH of the environment; a greater amount of formaldehyde is produced as pH decreases. Methenamine is commercially available in combination with hippuric acid (Hiprex) or mandelic acid (Mandelamine). These weak organic acids have some antibacterial activity and also act to keep the urine acidic. Plasma concentrations of either methenamine or formaldehyde are generally low. It is believed that the formaldehyde denatures protein. Nearly all bacteria are sensitive to formaldehyde if a critical concentration is reached. Formaldehyde is generally bactericidal in action and is effective against a wide variety of organisms. If the urine is not acidic, then methenamine will not be activated. Despite the proposed mechanism of action, there are limited studies that support efficacy. There are multiple combination products that contain methenamine, but recently these have been removed from Medicare D plan formularies due to lack of any proven clinical benefit. Page 4 Antibiotics Most antibiotic classes with activity against typical microorganisms that cause UTIs remain the most clinically sound way to prevent UTIs with medication. However, antibiotic use increases bacterial resistance and side effects. Therefore, antibiotics for suppression/prevention of UTIs should be used when recurrent infections cannot be prevented with non-medication means such as good hygiene, treatment of any underlying condition that is contributing, good toileting programs, etc. In summary, agents for the prevention of recurrent UTIs generally lack good clinical trials proving the multiple proposed mechanisms of action. Therefore non-medication means should be addressed initially. However, given the increasing bacterial resistance with antibiotic use, it might be appropriate to try vitamin C or concentrated cranberry products prior to committing the resident to ongoing antibiotic therapy. If vitamin C or a concentrated cranberry product does not reduce the frequency of UTIs for the resident, then the agent should be stopped. Neil Medical Group – Pharmacy Services Division Article by Amanda Byrd, Pharm D, FASCP Trigeminal Neuralgia continued from page 1 Referral should be done if symptoms are refractory to medications. Radiofrequency thermal rhizotomy If the patient has no symptoms of pain for 4-6 weeks, the medication • Causes damage to the specific nerve fibers using heat. can be tapered. • One of the more common procedures that is used. • Short term relief in nearly 95% of individuals, although long term success is not achieved in 1/3 of individuals. • This procedure causes numbness of the face and masseter weakness. • Efficacy is based on small trials. Injection with Alcohol • • Based on a small trial with 98 people. The conclusion of this study is that the injection with alcohol can provide long lasting pain relief for those with pain in the mandibular region. • The probabilities of remaining pain free for 1, 2, 3, and 7 years after the procedures were 90.4%, 69%, 53.5%, and 33%, respectively. • Surgery/Procedures Surgery/procedures are indicated when symptoms are refractory to medication. Most of these procedures do have high rates of success. Micro vascular decompression • Patients that have more complications from the injection would have longer pain free periods. Complications included paresthesia, dysesthesia, masseter muscle weakness, heavy salivation or deep sensory loss. All patients experience some form of complication. • This procedure is not used often and is not mentioned in the guidelines. Complementary medicine Used to relieve pressure on the nerve as it exits the brain with this pressure normally being caused from a blood vessel or tumor. Complementary medicine, such as acupuncture, has been shown to relieve pain, but there have been no extensive studies to support effi• It does have high initial success rates (>70%) and also may have cacy. the longest duration of pain relief with 50% having pain relief for Conclusion three years following the procedure. Carbamazepine and oxcarbazepine are the most studied medications • It is able to preserve facial sensations, although in a few cases and may be the most effective in the treatment of trigeminal neuralgia. Carbamazepine there has been damage to other nerves. Other side effects include is considered the major complications in 3 patients: death and brain stem infarct. Common complications include: Meningitis, sensory loss, and long treatment of choice, and oxcarbazepine term hearing loss. can be used if the • Data is based on a trial with 1,185 patients. side effects are intolerable. Other mediGamma knife-stereotactic radiosurgery cations can be tried, • High dose of ionizing radiation using beams to the targeted area such as pimozide and baclofen, but have of the brain. not been extensively • Least invasive procedure. studied. Surgery is • It is able to give complete pain relief in >2/3 of patients. an option that can be if the pain is • Radio surgery can be used for those who have co-morbidities, used refractory. For high risk medical conditions or refractory pain following surgery. emergency room and • Complication is numbness caused by nerve damage, but this short term use, sumatriptan and inhaled lidocaine have been shown to be effective and occurs in only a few individuals. be considered although neither have been widely studied in large • There is not as much evidence for this surgery compared to the can trials or for long term use. Trigeminal Neuralgia lacks studies in micro vascular decompression procedures and it is also very expen- treatments causing difficulty in determining long term efficacy and sive which limits its use. safety. Article by Joanna Woten, Pharm D Candidate Wingate University Neil Medical Group – Pharmacy Services Division Page 5 Tardive Dyskinesia Tardive dyskinesia (TD) is a neurological disorder characterized by repetitive involuntary, purposeless movements. These movements are jerking, not rhythmic, and include tongue thrusting, facial grimacing, jerking of the head, lip smacking, mouth puckering, rolling of the tongue, or twisting of the trunk. Patients may also appear to be playing an invisible piano when the arms are extended. Oddly enough, symptoms subside when patients are asleep. Most cases of tardive dyskinesia are mild and some may be reversible, but others are irreversible and can be debilitating. Tardive dyskinesia is caused by the use of certain classes of medications. These classes include antipsychotics, antiemetics such as metoclopramide (Reglan) and promethazine (Phenergan), and medications with strong anticholinergic activity such as tri-cyclic antidepressants and diphenhydramine (Benadryl) . The largest risk factors for developing tardive dyskinesia are the exposure over time to the causative agent and the dose used. Other factors which increase the risk of tardive dyskinesia include age (children and elderly), female gender, smoking, alcoholism or substance abuse. Mental retardation, diabetes, and a family history of TD are also risk factors. have activity at D1 and serotonin receptors as well. Because of this additional blockade of other sites, the atypical agents are considered by most practitioners to be less likely to cause TD. This theory has only been proven for the atypical agent clozapine (Clozaril). Clozaril has even been shown to reverse TD in some cases. Treatment of tardive dyskinesia is aimed toward symptom control. Unfortunately, there is no universally proven treatment for TD. The first step is to decrease or remove the causative agent, but the need for the medication must be weighed against the symptoms. Patients can sometimes be switched to another agent with a lower risk of TD. Oddly enough, when the dose is decreased, or the medication is discontinued, an increase in TD symptoms may be seen. This is due to the fact that the medication often masks some of the symptoms of TD. These symptoms then only appear with a dose change. Most cases of tardive dyskinesia are mild and some may be reversible, but others are irreversible and can be debilitating. Of the medications that can cause TD, antipsychotics are the most prominent. The 2011 OSCAR data shows that 25.2% of long-term care residents receive an antipsychotic agent. One study that followed the development of tardive dyskinesia showed that 32% of patients had persistent tics after five years of exposure to a causative agent, 57% after 10 years, and 68% after 25 years. Other studies have shown that 510% of those treated with antipsychotics develop TD each year. The data concludes that if treated long enough, almost all patients will develop tardive dyskinesia. Although TD was first described in 1964, the exact mechanism of action is not fully understood. The most popular theory is that dopamine receptor blockade leads to the upregulation of receptors and hypersensitivity, especially with Dopamine-2 (D2) receptors. Dopamine is a neurotransmitter which is essential to CNS function. Too little stimulation of dopamine receptors leads to abnormal nerve transmission and muscle movement, such as in Parkinson’s disease. Typical antipsychotic agents, such as Haldol and Thorazine, block mainly dopamine D2 receptors. The newer, atypical agents, (Risperdal, Zyprexa, Clozaril) also block D2 receptors, but Other treatments that have been tried are anecdotal in success. These include the use of vitamin E and B6, clonidine, propranolol, baclofen, melatonin, benzodiazepines, and botox. Antiepileptic medications such as Depakote and Keppra have been tried along with anti-Parkinson’s medications like Mirapex and Requip. Another agent which has had some success is the dopamine-depleting agent, tetrabenazine (Xenazine). This medication carries a Black Box Warning due to increased risk of depression and suicidal thoughts. Although clozapine (Clozaril) has been shown to reverse TD in some cases, it carries its own risks of neutropenia. Patients, physicians, and pharmacies must be enrolled in the clozapine REMS program. Monthly to weekly CBC monitoring must be done on patients receiving Clozaril before the medication can be dispensed. Prevention is the key “treatment” for tardive dyskinesia. Residents and family members should be informed of the risk of TD as well as the signs and symptoms to look for. The use of medications causing TD should be restricted to residents for which there are no other alternatives and doses should be reviewed and reduced periodically. Residents should also be monitored by the nursing staff periodically using either a DISCUS or AIMS form. These should be completed on admission for all residents, then every 6 months for those receiving TD-causing meds, and within 3 months of a dose reduction or discontinuation. Page 6 Neil Medical Group – Pharmacy Services Division Article by Lori Poplin, Pharm D Medical Calculations Quiz by Crystal Chandler, Pharm D, CGP Consultant Pharmacist 1. Lasix is available in 2-ml ampoules labeled as 10mg/ml. How many ampoules must be used to obtain a single 80mg dose? A. B. C. D. 2. An expectorant contains 480mg of dextromethorphan per 6-fluid ounce bottle. How many mg of drug are present in every teaspoonful dose? A. B. C. D. 3. 4 8 6 16 13.3 mg 14.5 mg 10 mg 15 mg A 200 ml bottle of penicillin suspension (125mg/5ml) is dispensed for a resident with dysphagia. The directions read “ 1 tsp every 6 hrs ATC.” How many days supply was dispensed? A. B. C. D. 7 days 12 days 14 days 10 days 4. A resident who wishes not to be hospitalized is to receive an infusion of 2 gm of lidocaine in 500mL of D5W at a rate of 2mg/ min. What is the flow rate in ml/h? A. B. C. D. An on-call physician returned your call after receiving a sub-therapeutic phenytoin level from the lab late one Friday evening. The physician ordered phenytoin suspension 200mg now and in the morning. Since this was ordered after-hours, the medication has to be obtained from the back-up 24 hr local pharmacy. Instructions on the label did not state how many ml of 125mg/5ml suspension to give. How many ml do you draw up for each dose of phenytoin? A. B. C. D. Vancomycin was dosed by NMG pharmacy per physician orders. Pharmacy calculated dose as Vancomycin 750 mg IV in 250 ml NS every 36 hrs for 12 days. Solution is to be administered over at least 90 minutes. What is the calculated flow rate in ml/hr (rounded estimated value acceptable)? A. 250 ml/hr B. 148.6 ml/hr (150 ml/hr) C. 150 ml/hr D. 166.6 ml/hr (175ml/hr) 2. A 3. D 4. B 5. C 6. D ANSWERS 6. 6ml 7ml 8ml 10ml 1. A 5. 40 ml/h 30ml/h 60ml/h 100 ml/h Neil Medical Group – Pharmacy Services Division Page 7 Kinston Pharmacy 2545 Jetport Road Kinston, NC 28504 Phone 800 735-9111 Fax 800 633-3298 Neil Medical Group Pharmacy Services Mooresville Pharmacy 947 N. Main Street Mooresville, NC 28115 Phone 800 578-6506 Fax 800 578-1672 ...a note from the Editor Working in LTC has always been challenging, but regulatory changes and reductions in reimbursement have underscored this. Persistence and hard work can help get us through. “Nothing in the world can take the place of persistence. Talent will not; nothing is more common than unsuccessful men and women with talent. Genius will not; unrewarded genius is almost a proverb. Education will not; the world is full of educated derelicts. Persistence and determination alone are omnipotent. The slogan “press on” has solved and always will solve the problems of the human race.” Author…..Calvin Coolidge So…..in the changing world of long term care…...and with dedication for those we serve….keep the faith…….embrace every new challenge…….look at every “set back” as an opportunity to grow……..and…… press on. Sincerely, Cathy Fuquay Pharm Notes is a bimonthly publication by Neil Medical Group Pharmacy Services Division. Articles from all health care disciplines pertinent to long-term care are welcome. References for articles in Pharm Notes are available upon request. Your comments and suggestions are appreciated. Contact: Cathy Fuquay ([email protected]) 1-800-862-4533 ext. 3489 Note: Periodically, we are asked to add a name to our distribution list. At this time, copies of Pharm Notes newsletters are distributed in bulk to Neil Medical Group customers only.