Suffocation Sensation in ENS: Nasal Physiology and Perception Disorder
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| The CT scans above and below show a patient who underwent surgery at another clinic and presented with signs of ENS. Both inferior turbinates were almost completely resected, and the nasal cavity is abnormally large. The maxillary sinus osteoma was also enlarged. |
Empty Nose Syndrome (ENS) is a complex condition where the patient experiences severe shortness of breath, air hunger, and a feeling of suffocation, even though the nasal passages appear normal or spacious. The most striking feature is that, despite the nose being anatomically open, the patient feels as if they are not breathing at all. This often causes significant anxiety, panic, and a marked decrease in quality of life.
It is a chronic condition resulting from abnormal enlargement of the nasal cavity or alterations to anatomical structures, causing breathing and quality of life problems. Changes in nasal volume and structure lead to alterations in airflow curves and structural changes in the nasal mucosa. Over time, patients develop neurological damage within the nasal passages and associated complex symptoms.
ENS particularly occurs after excessive reduction or dysfunction of the nasal turbinates (inferior and middle turbinates). However, the problem is not simply a matter of mechanical narrowing or opening; the real issue is the inability to perceive airflow within the nose and the brain's inability to correctly interpret breathing.
What is Empty Nose Syndrome?
Empty Nose Syndrome can be defined as a "sensory breathing disorder" that develops due to the loss of volume and function of the turbinates inside the nose. Normally, the turbinates direct, warm, humidify the air entering the nose, and most importantly, transmit this airflow to the brain via nerve endings.
In ENS, with the reduction of these structures, the inside of the nose becomes virtually an "empty" space. Although air passes easily, this airflow is not sufficiently perceived. Patients therefore frequently use the phrase "my nose is open, but I can't breathe"
This creates a paradoxical medical situation: an anatomically open nose creates a severe feeling of shortness of breath functionally.
Why Do Patients Experience a "Suffocation" Feeling?
One of the most significant complaints experienced by ENS patients is a feeling of suffocation. This feeling doesn't actually stem from a lack of oxygen, but rather from the brain's inability to receive sensory feedback related to breathing.
Normally, air passing through the nose creates a certain resistance and turbulence thanks to the turbinates. This turbulence stimulates the nerve endings inside the nose and sends a "air is entering" signal to the brain. In ENS, however, this structure is disrupted, causing air to pass more smoothly, faster, and quietly. The brain cannot adequately "perceive" this flow. Another mechanism could be that the nose adapts the outside air to our lungs, and the altered nasal anatomy causes accelerated air (cold, dirty, dry, and unpressurized) to travel to the lower respiratory tract, reducing the amount of oxygen absorbed, or preventing the terminal airways from opening sufficiently.
As a result, even if the person is actually breathing, the brain generates an alarm such as "no air". This leads to a feeling of suffocation, a need to take deep breaths, and sometimes a feeling of panic. This sensation can become even more pronounced, especially in quiet environments, because the patient cannot hear or feel the presence of their breath.
Impaired Airflow Perception
In a normal nose, air circulates around the turbinates, concentrating in certain areas, and this concentration is detected by the trigeminal nerve. This perception is crucial for the brain to assess breathing.
However, in ENS, when the volume of the turbinates decreases, the airflow passes quickly through a smooth channel, and this turbulence disappears. Therefore, the nerve endings do not receive enough stimulation. The brain interprets this deficiency as “insufficient air”.
This situation is even more confusing, especially in physically healthy individuals, because despite normal oxygen levels, the person experiences severe shortness of breath.
The Role of the Trigeminal Nerve and Sensory Loss
The trigeminal nerve is one of the most important sensory nerves in the nose. This nerve senses the coldness, humidity, and flow of the air passing through the nose. Normally, this nerve constantly transmits the information "breathing is taking place" to the brain.
In ENS, the excessive reduction in turbinate hypertrophy (ENS) severely reduces the stimulation of these nerves. The sensation of cold air and the perception of air movement are particularly weakened. This disrupts the brain's respiratory assessment system.
The brain often perceives this missing signal as a threat, and the person may unconsciously develop anxiety. This further intensifies the feeling of suffocation.
Loss of Nasal Resistance and Respiratory Imbalance
In normal nasal anatomy, there is a certain resistance to airflow. This resistance is actually necessary for the healthy functioning of the respiratory system. Thanks to this resistance, the lungs use air more efficiently.
In ENS, this resistance is excessively reduced. Because air passes through the nose too easily, the person may feel "I can't breathe enough". Because the respiratory system is accustomed to working under a certain resistance.
This change also affects the breathing rhythm. The person feels the need to take deeper breaths, may frequently sigh, and this can lead to respiratory imbalance over time.
Dryness, Crusting, and Discomfort
One of the most common problems in patients with Empty Nose Syndrome is dryness inside the nose. The turbinates not only direct airflow but also humidify and warm the air.
With the loss of these structures, the nasal environment becomes dry. Over time, dryness causes crusting, burning, and irritation. This physical discomfort also worsens the patient's breathing sensation.
The feeling of dryness also creates a constant "not enough air" feeling because nasal comfort is gone.
Brain and Respiratory Perception Dissonance
One of the most important aspects of ENS is the dissonance between the central nervous system and the respiratory system. The brain uses the normal nasal sensation from the past as a reference. This reference allows it to assess whether or not one is breathing.
However, when the turbinates disappear or are excessively reduced in size, this reference system is disrupted. The brain cannot understand that it is receiving enough air and constantly produces a "breathing insufficiently" signal.
This can lead to hyperventilation, anxiety, and panic attack-like symptoms in some patients. This feeling becomes more pronounced, especially at night.
Psychological Effects and Quality of Life
ENS is not just a physical problem; it is also a condition with serious psychological effects. Patients experience anxiety due to the constant feeling of shortness of breath.
Sleep disturbances are common. The person may have difficulty falling asleep at night or may wake up frequently. This leads to daytime fatigue. In the long term, depressive symptoms may develop.
However, there is an important point here: psychological symptoms are usually the result, not the cause, of the disease. The underlying problem is intranasal sensory dysfunction.
Empty Nose Syndrome is not simply a problem with nasal passages. The real issue is the brain's inability to properly perceive the airflow within the nose. The loss of the turbinates impairs both the mechanical and sensory systems.
Therefore, patients experience a severe feeling of "suffocation" even when their oxygen levels are normal. This highlights the importance of the complex sensory system between the nose and the brain.
The correct approach is a holistic treatment plan that considers not only the anatomy but also the sensory and psychological aspects.
A Possible Cause of Air Hunger Sensation in Empty Nose Syndrome: Inadequately Processed Air Reaching the Lower Respiratory Tract from the Nose
Empty Nose Syndrome (ENS) is generally associated with impaired perception of nasal airflow, loss of mucosal sensation, and insufficient stimulation of trigeminal nerve receptors. However, some researchers and clinicians believe that air hunger and the feeling of suffocation may not be explained solely by neurosensory mechanisms, and that changes in the quality of air reaching the lower respiratory tract may also play a role.
Normally, the nose is not just a passageway for air. It functions as a highly sophisticated biological "air processing system," filtering, humidifying, warming, and preparing inhaled air for the lungs. The inferior turbinates, in particular, direct airflow, creating turbulence and increasing the contact time between air and the mucous membranes. This ensures that the air reaching the lungs is brought to a specific temperature, humidity, and pressure level.
In Empty Nose Syndrome, excessive reduction of the inferior turbinate tissue or disruption of normal nasal aerodynamics can result in some air reaching the lower respiratory tract without being adequately processed. Theoretically, this can create additional physiological stress on the bronchi and alveoli. The arrival of drier, colder air with different pressure characteristics to the extremities of the lungs can contribute to a feeling in some patients that the breath "doesn't go deep enough" or that the lungs aren't fully filled.
Insufficient Alveolar Expansion and Feeling of Air Hunger
The exchange of oxygen and carbon dioxide in the lungs takes place in millions of tiny air sacs called alveoli. Proper airflow, adequate humidity, and normal respiratory mechanics are necessary for these structures to function effectively. It is suggested that in cases where nasal physiology is severely disrupted, changes in the characteristics of the air reaching the lungs can affect the optimal expansion of the alveoli.
Some ENS patients' statements such as "I'm breathing but I'm not getting enough oxygen," "my lungs aren't filling," or "I constantly feel the need to take deep breaths" may be too consistent to be explained solely by a psychological condition or anxiety. This feeling may stem from changes in the feedback mechanisms created by the alveoli and lower airways during normal breathing.
Changes in Respiratory Mechanics and Oxygenation Perception
Interestingly, many ENS patients have normal standard pulmonary function tests and blood oxygen levels. Despite this, the patient may experience severe shortness of breath. This may be due not so much to an actual lack of oxygen, but rather to changes in the mechanical and sensory signals that the respiratory system sends to the brain.
There is a constant physiological communication between the nose, upper airways, and lungs. When the character of airflow in the nose changes, the feedback from the lower airways and chest wall can also differ. As a result, even though the patient is objectively receiving sufficient oxygen, they may subjectively experience a feeling of "not getting enough breath."
A Hypothesis Requiring Further Investigation in the Future
The idea that insufficiently filtered, humidified, heated, and physiologically conditioned air reaching the lower respiratory tract contributes to ENS symptoms is not currently a definitively proven mechanism. However, given the feelings of air hunger, chest emptiness, and the need for deep breathing described by many patients, this hypothesis seems worthy of scientific investigation.
Future studies could reveal the relationship between nasal aerodynamics, alveolar ventilation, respiratory muscle function, and mechanoreceptor responses in the lungs in more detail. This would provide a clearer understanding of whether the feeling of suffocation seen in Empty Nose Syndrome stems solely from sensory changes within the nose, or from physiological effects occurring throughout the entire respiratory system.
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Murat Enoz, MD, Otorhinolaryngology, Head and Neck Surgeon
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