Blog by Karen Sheffler, MS, CCC-SLP, BCS-S of SwallowStudy.com
Hard Pill to Swallow
is a reference to a Bill Lupkin.
Let’s imaging a patient with dysphagia compensating well with a soft, moist, easy-to-chew diet and thin liquids, following strategies including upright positioning and small sips. We think all is well in the patient’s world of eating and swallowing.
Then, along comes medication time!
Patient A knows she has to take her 30ml of liquid Lactulose slowly, using 4-5 careful sips. However, during her hospital stay she had a big aspiration event when she was woken up at 4am and dependently fed the 30ml in a rapid fashion. She reported that she breathed in the liquid, as it was fed to her too quickly.
Patient B was faithfully takes small sips of thin liquids. He knows to go slowly to avoid shortness of breath and discoordination of breathing and swallowing. However, he reported he was given his pills in applesauce, as recommended by the SLP, but it was at 4 am while laying “pretty well flat.” He described a huge coughing fit.
These cases show the hazards of medication passes, regardless of the method of administration. They highlight the dangers of dependent feeding and feeding someone who is not fully upright and alert.
But there is much more to the story…
The Speech-Language Pathologist (SLP) evaluating a patient’s swallowing function and safety need to concern her/himself with all aspects of how a patient is taking medications. Whether in pill form, liquid, or crushed, medication delivery can cause aspiration, pill residue, and potentially incomplete absorption. The medical team needs to know if these are risks. Team collaboration is crucial, including the patient, family, doctor/nurse practitioner/physician’s assistant, SLP, nursing, and pharmacy.
New research from Dysphagia Research Society, 2015:
1. Drug remnants found after medication pass
Nozaki et al., (2015, March) caution that patients have to be carefully watched when taking medicine, whether it is in powder form, a tablet or a capsule. They studied 213 cases of patients who reported difficulty taking medications. This was defined as: difficulty swallowing medication, swallowing more than 3 times to clear, repeatedly washing down medicine, and choking on the medicine. The patients’ etiologies were CVA, neuromuscular disorders, mild dementia, respiratory disorders, head and neck issues, and others. The majority of the patients were in their 60’s-90’s.
A key finding was that drug remnants were found in the oral and/or pharyngeal cavities in 117 of the 213 patients (55%). Drug remnants were found in the esophagus in 26 out of 213 patients (12%). Interestingly, 38 of the 117 patients with oropharyngeal drug remnants were on regular diets. Whether or not drug remnants were found was NOT correlated with the patient’s diet consistency or dependence in feeding.
2. Testing barium pills on videoflouroscopy
Miles et al., (2015, March) commented on how esophageal transit times vary so widely when a patient is told to take a pill “using as much water as you need.” Overall, they noted delayed esophageal transit times in upright positions with pill and paste may not be a relevant test to distinguish normal from abnormal findings. (Note: this study did show that age was a significant factor in delayed esophageal transit for fluid in 20ml volumes.)
So, studying the pill through the esophagus may not be as helpful as identifying oropharyngeal deficits when taking a barium pill. Testing a pill on a Modified Barium Swallow Study (aka, VFSS or Videoflouroscopic Swallow Study) has been found to be very useful (per Brady et al., 2015, March). Brady’s team reported on their prospective/observational study of 65 rehabilitation patients who had been referred to speech pathology for a VFSS. These 65 patients met inclusion criteria (i.e, without significantly altered mental status and safe per the VFSS to proceed with a 12mm barium tablet). Based on clinical judgement, the tablet was given whole in pudding, with nectar thick barium, or with thin liquid barium.
They noted that the barium tablet can provide information on:
- oral transit,
- bolus propulsion,
- pharyngeal dysfunction (i.e., pill stasis/stagnation was most common in the valleculae, but also found in the pyriforms, along the posterior pharyngeal wall, or at the cricopharyngeus),
- penetration/aspiration on the barium carrier agent (i.e., aspiration on the liquid while swallowing the tablet). No patient aspirated a tablet.
Researchers also noted that the patients’ ability to identify difficulties in swallowing pills is “fairly accurate.” Recommendations for medication administration were changed in 47.7% of the patients (31/65) based on the results of the VFSS. Fortunately, 33.8% of those recommendations were to a lesser restrictive method. Of note, 2 patients penetrated and 5 patients aspirated thin liquid barium when swallowing a pill when aspiration was not present with sips of thin liquid in isolation. These 7 patients were on regular diets based on the VFSS. Again, the patients’ diet consistency was not a predicting factor in whether or not they would aspirate on liquids while taking a pill.
Brady’s study points out how pill testing on a VFSS so critical in giving complete recommendations.
It is simple to advise embedding the pill in a puree (applesauce, pudding, yogurt). The VFSS study could also see if a liquid wash is necessary after swallowing the pill in the vehicle of a puree.
Riquelme et al., (2015, March) compared oral transit times and pharyngeal transit times for liquids and purees when swallowing a pill versus when not swallowing a pill. However, the pill used was a capsule filled with barium powder (not a 12mm or 13mm barium tablet). The team performed VFSS on 19 subjects over the age of 65 who were referred for the study. There was no statistical significance in oral or pharyngeal transit times between the presence or absence of a pill. There was only a trend towards marginally longer oral transit times when swallowing with a pill. No differences found in Penetration/Aspiration Scale(PAS) scores; however, they noted this may be due to overall fairly functional swallows and low PAS scores in their sample. Potentially, the patients did not have significant enough physiological deficits to note a change in those temporal measures. Also, the use of a capsule may have affected the outcomes. In the study by Nozaki et al., 2015, the capsule was rated the easiest to swallow, while the tablet was the hardest. Brady’s study above did use a 12mm barium tablet.
Riquelme et al., noted in the poster: “Impaired swallow physiology further challenges the system in the presence of a pill.”
3. Be careful in your recommendations of pill administration:
Julie Cichero (University of Queensland, Brisbane, Queensland, Australia and co-chair International Dysphagia Diet Standardisation Initiative: www.IDDSI.org) and her team have been investigating medication absorption when pills are crushed into a thickened liquid.
I’ll give the bottom line first:
- Do not crush meds and place them in a thickened liquid (modified cornstarch or xanthan), and
- Do not thicken your liquid medications with cornstarch-based or xanthan gum-based thickeners.
Hang in there through these details, because I called my chemist dad to help me understand it. Further explanation below, after I review these two fabulous studies.
1. Manrique et al., (2015, March) studied the potential bioavailability of paracetamol (aka, acetaminophen/Tylenol) when dissolved in plain water versus in an extremely thickened liquid (like a pudding/spoon-thick). They studied four formulation types: immediate release crushed tablets, elixir, suspension, and soluble/effervescent tablets. The commercial thickening agent was Easythick Advanced (xanthan gum thickener). They performed in vitro (test tube) “drug release studies” “with a USP Apparatus 2” to test the dissolution in simulated gastric fluid HCI pH 1.2, 50 rpm, 37 degrees Celsius. This temperature simulates the human body. (Dissolution testing is widely used in the pharmaceutical industry for optimizing formulations, and it tests how much diffusion or disintegration of the medication takes place into a solution.)
Researchers found the dissolution of the medication at 30 minutes was:
- 12-51% when formulations were mixed with the thickener. (The effervescent tablet mixed with a thickener was the fastest/best, but still only 51% of the drug diffused. Suprisingly, the suspension and elixir formulations were the slowest/worst when mixed with the thickener, at 12% and 13.6%, respectively).
- 97% when crushed tablets in placed in water without a thickener agent.
“Although thickened liquids provide an adequate profile for safe swallowing, administration with drugs may impact bioavailability.”
2. Radhakrishanan et al., (2015, March) extended this idea to in vivo models. They used a randomized cross-over design to study an oral dose of paracetamol in 20 healthy volunteers. The formulation was immediate-release tablets given in the following methods: whole tablet, tablet crushed in water, tablet crushed in jam, and tablet crushed in an extremely thick liquid. They performed a saliva analysis to test salivary paracetamol concentrations. “The extent of absorption of crushed paracetamol with water and jam did not differ,” per the researchers’ poster. However, when the medication was crushed into an extremely thick liquid, it was significantly associated with a reduction in:
- absorption rate,
- peak plasma concentration,
- time to reach peak plasma concentration.
My first thought was: “Wow, this is huge!”
How many times have we seen liquid medications thickened with thickener powders?
How many times have we seen crushed meds delivered in the patient’s thickened liquid?
My second thought was: “I have to call my dad!” The chemistry was going over my head as Manrique et al., (2015, March) speculated: “the underlying structure of the polymer of thickened liquids may play a role in the diffusion of drug molecules into gastrointestinal fluids.”
Polymers? Ah!!! Dad!
My father, Dr R.H. Sheffler, graduated from Rensselaer Polytechnic Institute in 1963, obtained his PhD in Chemistry from the University of McGill in 1967, and worked in polymer chemistry for over 40 years.
So here is my summary of our phone call:
The more dilute the solution is surrounding the substance, the quicker the substance will dissolve. A dilute solution does not interfere with the diffusion process. For example, salt crystals in plain water loose their crystal lattice structure fairly quickly until the solution is saturated to an equilibrium state. Warmer liquid will speed up this diffusion process. If the liquid is cooled down, the crystal structures may reform; so it is temperature dependent.
Xanthan gum and Modified Cornstarch/Foodstarch-Based Thickeners are Polymers:
It made complete sense to my dad that thickeners would interfere with and delay the diffusion process, retarding the dissolution of medications.
These thickeners are long-chain polysaccharides (which are polymers).
Polymer: a general term for an extended structure formed by chemical bonds from long chains holding things together. The longer the chains, the more difficult is is to separate.
For example, xanthan gum is a polymer with side chains of trisaccharides. These side chains hanging out and sticking out all over the place increase the thickening ability as they grab on to each other. Sure, this is an effective way to thicken a liquid, but will they also grab onto the complex compounds in medications?
Cichero’s team tested only xanthan gum thickeners, but the modified cornstarch thickeners would likely perform the same.
It requires a more significant digestive process to break down the polymer structures in a thickened liquid versus the cellulose and sugars in applesauce or the pectin and sugars in a jam. Applesauce and jam do not require an extended process and dilute quickly.
When medications are crushed in applesauce (or jam as in Australia), the medication is more immediately bioavailable.
More Warnings About Crushing Medications:
Never crush medications meant to be extended release, as this could case an overdose. Medications that are meant to be released slowly have special compounds in the formulation called: excipients. Crushing the medication would destroy how these compounds were meant to interact with the target medication.
My dad joked that you could change a pill into a slow-release medication by adding the crushed medication to a thickened liquid, limiting its diffusion. Just a joke – this is certainly not recommended.
What if the medication is not becoming bioavailable fast enough, and the patient’s symptoms escalate? Does that force the doctor to give more medications? What if the team decides that the Tylenol is not working to target the pain, and a heavy-hitter medication is ordered, changing the patient’s mental status significantly? The patient may get over-medicated and over-sedated.
What if the body eliminates the medication while it is still bound to the thickened liquid polymer, and the patient is under-medicated? Under-medication of some drugs could lead to serious cardiac and neurological compromise, including heart attack and stroke.
Clearly more research is needed in this area. What if you crush the medication in yogurt or pudding, which has milk proteins and fats?
Bottom line again:
- do not crush meds and place them in a thickened liquid (modified cornstarch or xanthan), and
- do not thicken your liquid medications with cornstarch-based or xanthan gum-based thickeners.
Like I said, this is huge! Spread the news! Check out Institute for Safe Medication Practices (ISMP) and their list of tools, which includes a pdf on medications that cannot be crushed.
So much gratitude and appreciation also goes out to all the researchers who shared these studies at this year’s Dysphagia Research Society Annual Meeting in Chicago, IL. See References below. Follow more from the meeting on Twitter with #DRS2015.
Facebook: Dysphagia Research Society:
References from #DRS2015 (Dysphagia Research Society 23rd Annual Meeting):
Brady, S.L., Rao, N. Srigiriraju, P., Aliga, N. & Padalik, S. (2015, March). Is it a Hard Pill to Swallow? VFSS Findings with the Rehabilitation Patient. Poster presented at the Dysphagia Research Society 23rd Annual Meeting, Chicago, IL.
Manrique, Y.J., Sparkes, A., Stokes, J., Cichero, J., Nissen, L. & Steadman, K. (2015, March). Modifying Paracetamol for People with Dysphagia: From Crushed Tablets to Thickened Liquid Medications. Poster presented at the Dysphagia Research Society 23rd Annual Meeting, Chicago, IL.
Miles, A., Jardine, M., Clark, S. & Allen, J. (2015, March). Pharyngeal and Esophageal Bolus Transit Time in Healthy Adults. Paper presented at the Dysphagia Research Society 23rd Annual Meeting, Chicago, IL.
Nozaki, S., Yoshikawa, M, Miyamoto, M., Hirano, M., Inoue, M., Nohara, K. & Kubo, K. (2015, March). Difficulties of taking medicine in elderly patients. Poster presented at the Dysphagia Research Society 23rd Annual Meeting, Chicago, IL.
Radhakrishnan, C., Nissen, L., Cichero, J., Reuter, S. & Steadman, K. (2015, March). Interactions between Paracetamol and Medication Carriers (Thickened Liquids and Jam): An In Vivo Study. Poster presented at the Dysphagia Research Society 23rd Annual Meeting, Chicago, IL.
Riquelme, L.F., Tahhan, H.J. & Teitcher, J.E. (2015, March). Changes in Temporal Measures For Pill Swallowing in Adults with Oropharyngeal Dysphagia. Poster presented at the Dysphagia Research Society 23rd Annual Meeting, Chicago, IL.
Further reading (references not covered in this blog):
Manrique, YJ, Lee, DJ, Islam, F, Nissen, LM, Cichero, JA, Stokes, JR & Steadman, KJ. (2014). Crushed tablets: Does the administration of food vehicles and thickened fluids to aid medication swallowing alter drug release? Journal Pharm Pharm Sci, 17 (2), 207-219.
Carnaby-Mann, G & Crary, M (2005). Pill swallowing by adults with dysphagia. Arch Otolaryngol Head Neck Surg, 131 (11), 970-975.
Gallo, SH, McClave, SA, Makk, LJ, Looney, SW (1996). Standardization of clinical criteria required for use of the 12.5 millimeter barium tablet in evaluating esophageal lumenal patency. Gastrointest Endoscopy, 44 (2), 181-184.
Kern, MK, Ren, J, Arndorfer, RC, Hofmann, CL, Shaker, R. (1996). Kinematic and dynamic characteristics of solid pellet movement during the pharyngeal phase of swallowing. Ann OtolRhinolLaryngol, 05 (9),716-723.
By Karen Sheffler