The Scariest Words in a Dysphagia Evaluation

It’s October, so let’s talk about the words that make a room go quiet.

You’ve seen it happen. You say “aspiration” and the daughter grips her dad’s hand. You write “NPO” and the nurse pulls the lunch tray before you finish the note. 

These words are scary because they’re misunderstood. Sometimes by patients. Sometimes by physicians. And, if we’re honest, sometimes by us early in our careers. The words themselves aren’t the monster. Using them loosely is.

Here’s how to define them precisely, explain them in a way patients can actually use, and back your recommendations with the right assessment.

Scary words #1–3: Penetration vs. aspiration, and what NPO really means

The line between penetration and aspiration is anatomical: the true vocal folds. Name it precisely every time, because the plan of care changes with it.

Penetration (PAS 2–5): Material enters the airway (laryngeal vestibule) but stays at or above the true vocal folds.

Aspiration (PAS 6–8): Material passes below the true vocal folds into the trachea.

Silent aspiration (PAS 8): Material passes below the true vocal folds with no effort to eject it.

NPO: Nil per os. Nothing by mouth: no food, no liquid, sometimes no medications.

The 8-point PAS (Rosenbek et al., 1996) also tells you whether material was ejected, and from where. “Penetration, cleared with a spontaneous cough” and “penetration to the cords, not ejected” are very different stories. Document the whole story, not just the category.

NPO deserves its own warning label. It feels like the safe choice , however, it isn’t risk-free. NPO patients still swallow their own secretions, and those secretions carry oral bacteria. We can also see an increase in reflux-related symptoms. Tube feeding does not eliminate aspiration pneumonia risk, and research has linked it to higher risk. NPO is a tool for a specific clinical picture. It is not a default for “I’m not sure.”

When you recommend NPO, say why, say what you’re waiting for, and say when you’ll reassess.

Does aspiration cause pneumonia? The three pillars of aspiration pneumonia

Aspiration is an event. Aspiration pneumonia is an infection. Plenty of people aspirate and never get sick. Healthy adults aspirate small amounts of saliva during sleep, and their lungs handle it (Gleeson et al., 1997).

Whether aspiration turns into pneumonia depends on more than the swallow. Langmore and colleagues (1998) found that dysphagia alone was not enough to predict pneumonia. Dependence for feeding, dependence for oral care, decayed teeth, tube feeding, multiple diagnoses, number of medications, and smoking all mattered. Dependence for feeding was among the strongest predictors.

A practical way to organize this is three pillars:

1. What goes down. The bacterial load of what’s aspirated. A dirty mouth makes every aspiration event more dangerous. Oral care, dentition, and secretion management live here.
2. How much and how often. Volume, frequency, and type of material. A trace amount of thin water once a meal is not the same as recurrent aspiration of acidic reflux or large boluses.
3. How well the body defends itself. Cough strength, pulmonary clearance, mobility, immune status, and overall health. An ambulatory patient with a strong cough clears material when a bedbound, deconditioned patient cannot.

How to explain aspiration risk to patients using the pillars

This is where the fear turns into a plan. Instead of “you aspirate, so no thin liquids,” you can say:

“We saw some water go into your airway. That by itself doesn’t mean you’ll get pneumonia. Your risk depends on three things: how clean your mouth is, how much goes down, and how strong your body is at clearing it. We can work on all three.”

Now the patient has jobs. Brush and clean the mouth before meals. Strengthen the swallowing musculature. Build cough and respiratory strength.

The pillars also support informed decisions. A patient who chooses thin liquids despite trace aspiration can lower their risk on the other two pillars. That’s person-centered care, and it holds up clinically.

The scariest word of all: silent aspiration, and why the bedside swallow evaluation can’t catch it

Silent aspiration means material enters the trachea and the patient does nothing about it. No cough. No throat clear. No watery eyes. No change on their face.

It’s common. Studies across stroke, neurodegenerative, and mixed medical populations consistently find that a large share of patients who aspirate do so silently. In a review of 2,000 videofluoroscopic swallow studies, 55% of patients who aspirated had no protective cough (Garon et al., 2009). In other words, it’s more than half.

That’s the whole problem with relying on the bedside swallowing evaluation alone.

A clinical swallow evaluation (CSE) is valuable. It tells you about cognition, oral motor function, dentition, positioning, secretions, voice, and how the patient behaves at a meal. But at the bedside, we’re watching for the body’s reaction to aspiration. A cough, a wet voice, a change in breathing. When there’s no reaction, there’s nothing to see.

So the patient who “passed” the bedside may have aspirated every sip. And the patient who coughed on everything may have a strong, protective response that’s keeping them safe.

The bedside also can’t answer the questions that drive treatment:

• Why is material entering the airway? Reduced laryngeal closure, delayed initiation, poor base of tongue retraction, or reduced UES opening?
• When does it happen? Before, during, or after the swallow?
• We cannot treat what we cannot see.

Without those answers, we guess. And guessing leads to the scariest outcomes on both ends: unnecessary diet restrictions for people who were safe, and missed aspiration for people who weren’t.

FEES vs. MBSS: Which instrumental swallow study is best?

Both gold-standard instrumentals detect penetration and aspiration well. Each shows you things the other can’t.

FEES (Fiberoptic Endoscopic Evaluation of Swallowing)

• What you see: Direct view of pharynx and larynx: secretions, residue, anatomy, vocal fold movement
• Blind spot: “White-out” at the height of the swallow; limited view of oral phase and UES
• Radiation: None
• Food and liquid: Patient’s real food and drinks, dyed
• Where: Bedside, clinic, SNF, home
• Repeatability: Easy to repeat; can run longer to assess fatigue

MBSS / VFSS (Modified Barium Swallow Study)

• What you see: Oral, pharyngeal, and upper esophageal phases in motion
• Blind spot: Secretions and mucosal detail; soft tissue color and edema
• Radiation: Yes, kept brief
• Food and liquid: Barium-coated materials
• Where: Radiology suite
• Repeatability: Limited by radiation exposure and scheduling

Here’s the truth nobody puts on a comparison chart: the best instrumental is the one you can get.

A FEES done tomorrow beats an MBSS scheduled three weeks out while your patient sits on a restricted diet. An MBSS down the hall beats a FEES that requires a 90-minute drive the patient can’t make. The delay is a risk too. Weeks of unnecessary thickened liquids mean dehydration, weight loss, and a patient who stops trusting the process.

So choose based on the question you need answered, and on access:

• Reach for FEES when you need to see secretions, assess fatigue across a real meal, use biofeedback, avoid radiation, or the patient can’t travel.
• Reach for MBSS when you suspect an oral-phase or UES/esophageal component, need to measure hyolaryngeal excursion and timing with a standardized tool like the MBSImP (Martin-Harris et al., 2008), or FEES isn’t tolerated.
• Reach for whichever is available when the patient needs an answer now.

At SSNR in Tyler, Texas, we offer FEES in-office. That means our patients get answers in days, not weeks. If you practice in East Texas and your patients are waiting, that option exists.

Take the fear out of the words

The scary words aren’t going away. They’re part of the job. But we control how they land.

• Name penetration and aspiration precisely, with the PAS score and whether material was ejected.
• Treat NPO as a specific, time-limited recommendation with a reason and a reassessment plan.
• Teach patients the pillars so aspiration becomes something they can act on, not just fear.
• Remember that silent aspiration is invisible at the bedside. Get an instrumental.
• Pick the instrumental you can get, and get it soon.

If you’ve got a complex dysphagia patient and you’re not sure what to do next, you don’t have to figure it out alone. Grad school didn’t prepare most of us for this, and that’s not your fault. SSNR’s SLP mentorship gives you a real clinician to talk through the case with. No judgment, just practical clinical support.

Reach out at office@ssnrtx.com or 903-871-5712, or find us on Instagram at @ssnr_tx.

Happy Halloween from SSNR. May your PAS scores be low and your residue be minimal.

References

Garon, B. R., Sierzant, T., & Ormiston, C. (2009). Silent aspiration: Results of 2,000 video fluoroscopic evaluations. Journal of Neuroscience Nursing, 41(4), 178–185.

Gleeson, K., Eggli, D. F., & Maxwell, S. L. (1997). Quantitative aspiration during sleep in normal subjects. Chest, 111(5), 1266–1272. https://doi.org/10.1378/chest.111.5.1266

Langmore, S. E., Terpenning, M. S., Schork, A., Chen, Y., Murray, J. T., Lopatin, D., & Loesche, W. J. (1998). Predictors of aspiration pneumonia: How important is dysphagia? Dysphagia, 13(2), 69–81. https://doi.org/10.1007/PL00009559

Martin-Harris, B., Brodsky, M. B., Michel, Y., Castell, D. O., Schleicher, M., Sandidge, J., Maxwell, R., & Blair, J. (2008). MBS measurement tool for swallow impairment—MBSImp: Establishing a standard. Dysphagia, 23(4), 392–405. https://doi.org/10.1007/s00455-008-9185-9

Rosenbek, J. C., Robbins, J. A., Roecker, E. B., Coyle, J. L., & Wood, J. L. (1996). A penetration-aspiration scale. Dysphagia, 11(2), 93–98. https://doi.org/10.1007/BF00417897