Quick Answer
Myasthenia gravis produces weakness that worsens with use and recovers with rest. Routine nerve studies can be normal because the lesion sits at the neuromuscular junction, so specialised testing and antibody tests are used. Assessed at 1691 W. Horizon Ridge Parkway, Suite 100, Henderson NV 89012.
Part ofThis guide sits beneath myasthenia gravis, which covers the study itself, how it is performed and what the report should contain.
Myasthenia Gravis in Las Vegas and Henderson →Key Takeaways
- The signature is fatigable weakness: function deteriorating with use and recovering with rest.
- Drooping eyelids, double vision, chewing difficulty partway through a meal, or a voice becoming nasal.
- Routine nerve studies can be entirely normal, because the lesion sits at the junction.
- Weakness worsens with heat, which matters considerably in Southern Nevada.
- Breathing or swallowing difficulty is an emergency, not an appointment.
Myasthenia gravis
Myasthenia gravis is an autoimmune disorder of the neuromuscular junction, where nerve signals reach muscle. Antibodies interfere with that signal, producing weakness that characteristically worsens with use and improves with rest.
Weakness that worsens with use, and the studies that miss it
Myasthenia gravis is a disorder of the junction between nerve and muscle. The signature is fatigable weakness: function that deteriorates with sustained use and recovers with rest.
The pattern
Drooping eyelids or double vision, frequently the first symptoms and often worse at the end of the day or after reading. Difficulty chewing that develops partway through a meal. A voice that becomes nasal or quieter through a conversation. Weakness in the arms noticed with sustained overhead activity such as washing hair. Crucially, the fluctuation is the diagnosis: strength that is normal in the morning and poor by evening is a very different finding from steady weakness, and patients frequently do not report it because they assume tiredness explains it.
What heat does
Weakness worsens with heat, which matters considerably in Southern Nevada. A predictable summer deterioration can be read as the disease progressing when the underlying condition has not changed, and that misreading can prompt a treatment escalation that was not needed. Mentioning that symptoms follow the calendar, if they do, prevents that.
Why standard studies can be normal
Routine nerve conduction studies and needle electromyography assess nerve and muscle and can be entirely normal here, because the lesion sits at the junction between them. Specialised techniques are required, along with specific antibody blood tests. A patient told their nerve study was normal and therefore nothing is wrong has been given a misleading conclusion, and this is one of the clearest examples in neurology of a normal test not excluding a condition.
The red flags that are emergencies
Difficulty breathing, or difficulty swallowing with coughing or choking on food or fluids. Those indicate involvement of the muscles that protect the airway and need emergency assessment rather than an appointment. This is the most important thing on this page: the condition can deteriorate quickly, and a patient who waits for a routine slot with breathing or swallowing change has misjudged the urgency.
| Also considered | How it is distinguished |
|---|---|
| Thyroid eye disease | Eye findings without the fatigable weakness pattern; thyroid testing separates them. |
| Motor neuron disease | Progressive weakness with wasting and reflex changes rather than fatigability. |
| Mitochondrial and other myopathies | Fixed rather than fluctuating weakness. |
| Lambert-Eaton syndrome | Weakness improves briefly with exertion; repetitive stimulation testing distinguishes the two. |
What the practice does
01
What brings people in
Drooping eyelids, double vision, or weakness in chewing, speaking or the limbs that worsens as the day goes on.
02
What the evaluation settles
Whether weakness is genuinely fatigable, whether neuromuscular-junction transmission is measurably abnormal, and which antibody testing is indicated.
03
What you leave with
Repetitive-stimulation results interpreted in our accredited laboratory, antibody results, and a treatment and monitoring plan.
Assessment and testing
Examination looking specifically for fatigable weakness, including sustained upgaze and repeated movement rather than a single strength test. Antibody blood tests ordered and interpreted here. Electrodiagnostic testing including specialised junction techniques at both offices, in laboratories holding AANEM accreditation independently.
What is provided and what is not
Medical management and monitoring at both offices. Infusion-based therapy is coordinated with outside providers, since the practice operates no infusion suite, and that applies to treatments used in more significant disease. Thymus surgery, where indicated, is referred. No inpatient care, which matters here because deterioration can require it.
Medications that make it worse
A number of common medications can exacerbate myasthenia gravis, including some antibiotics and cardiac drugs. That makes it essential to tell every clinician you see, including in an emergency department or before any surgery, that you have this diagnosis. Carrying a written note of it is a reasonable precaution rather than an excessive one.
The first 30, 60 and 90 days
Step 1
First visit
History and neurological examination, a review of records and prior imaging, and a decision on which studies are actually indicated. You leave with the plan, not just a referral.
Step 2
Within 30 days
Indicated in-office studies are performed and interpreted by the neurologist who ordered them, in our AANEM-accredited laboratories. Results are explained in plain language.
Step 3
60 to 90 days
Follow-up to judge whether the plan is working, adjust it, and coordinate with your referring clinician. Where a diagnosis needs time to confirm, this is where it is revisited.
Attending from Henderson
The Henderson office is at 1691 W. Horizon Ridge Parkway, Suite 100, just off the 215 Beltway, with parking on site. All six in-office studies are performed and interpreted there, so nothing is sent across to Las Vegas. Green Valley, Anthem, Whitney and Boulder City are generally closer to it than to Flamingo Road. Adults 18 and older.
Not sure what is causing it?
Ask for the study to be graded rather than only named. Severity is what informs the decision.
The Bottom Line
Report the fluctuation rather than the weakness, and treat breathing or swallowing change as an emergency.
Frequently Asked Questions
What is the characteristic symptom?
Fatigable weakness: function that deteriorates with sustained use and recovers with rest. Drooping eyelids or double vision worse at the end of the day, difficulty chewing developing partway through a meal, or a voice becoming nasal through a conversation. The pattern through the day is the diagnostic clue, so describing when function is best and when it is worst is more useful than describing severity.
Why can my nerve study be normal?
Because routine studies assess nerve and muscle, and the lesion sits at the junction between them. Specialised techniques and specific antibody blood tests are required. A normal routine study does not exclude this condition. Repetitive stimulation testing is performed in our accredited laboratory and is the study that addresses the junction specifically.
When is it an emergency?
Difficulty breathing, or difficulty swallowing with coughing or choking on food or fluids. Those indicate involvement of the muscles protecting the airway and need emergency assessment rather than an appointment. Weakness that is worsening rapidly over days, rather than fluctuating through the day, also warrants urgent assessment rather than waiting for a routine appointment.
Does heat affect it?
Yes, weakness worsens with heat, which matters considerably in Southern Nevada. A predictable summer deterioration can be misread as the disease progressing, prompting a treatment change that was not needed. Planning outdoor activity for the cooler parts of the day, and keeping indoor temperature stable, is a practical part of management here.
Are there medications I should avoid?
A number of common medications can worsen it, including some antibiotics and cardiac drugs. Tell every clinician you see, including in an emergency department or before any surgery. Carrying a written note of the diagnosis is a reasonable precaution. Keep the list on your phone as well as on paper, since the paper copy is the one you will not have with you.
Is infusion treatment given at the practice?
No. Infusion-based therapy is coordinated with outside providers, since the practice operates no infusion suite. Thymus surgery where indicated is also referred. We handle diagnosis, medication management and monitoring, and we coordinate the infusion or the surgical referral, so care stays directed from one place rather than fragmenting across several unconnected providers.
Where exactly is the Henderson office?
1691 W. Horizon Ridge Parkway, Suite 100, Henderson NV 89012, just off the 215 Beltway, with parking on site. All six in-office studies are performed and interpreted there, so nothing is referred across to the Las Vegas office. Green Valley, Anthem, Whitney and Boulder City are generally closer to it than to West Flamingo Road.
Should I use the Henderson or the Las Vegas office?
Whichever is the shorter drive, since both are fully equipped and hold the same records. West Horizon Ridge Parkway generally suits Green Valley, Anthem and Boulder City; West Flamingo Road suits the west and southwest of the valley. If you can attend either, say so when booking, because availability differs between the two week to week.
Is the testing different from an ordinary nerve study?
Yes. A routine study assesses nerve and muscle, while the problem here sits at the junction between them, so repetitive stimulation testing is used alongside specific antibody blood tests. A normal routine study does not exclude the condition, which is why the right study has to be requested rather than assumed.
What should I tell other clinicians?
That you have the diagnosis, before any surgery, any anaesthetic and at any emergency department visit. A number of common medications including some antibiotics and cardiac drugs can worsen it. Carrying a written note, and keeping the list on your phone as well as on paper, is a reasonable precaution.
How this page was sourced
Practice facts come from Clinical Neurology Specialists directly: that electrodiagnostic testing is performed and interpreted at both offices in independently accredited laboratories, that two neurologists focus on neuromuscular medicine, and that surgery, imaging, infusion therapy and physical therapy are all coordinated or referred rather than provided on site. Clinical context is sourced to the organisations listed below.
No reference values, severity thresholds or named medications appear, because electrodiagnostic values vary by nerve, age, height and temperature and treatment selection is a clinical decision. No outcome is promised. Scope is adults 18 and older.
Change log
- 2026-07-28 — page published; clinical content reviewed.
- 2026-07-28 — last reviewed against AAN, AANEM and NINDS guidance; internal links and schema verified.
- Review cadence: quarterly, or sooner if guidance changes.
How to cite this page
Clinical Neurology Specialists. “Myasthenia gravis specialist Henderson.” Reviewed 2026-07-28. https://www.cnsnevada.com/conditions/myasthenia-gravis/myasthenia-gravis-specialist-henderson/
References
- Muscular Dystrophy Association — patient information across neuromuscular disorders.
- American Association of Neuromuscular & Electrodiagnostic Medicine — electrodiagnostic standards and laboratory accreditation.
- National Institute of Neurological Disorders and Stroke — the reference catalogue of nervous-system disorders.
This page is for general information about a Clinical Neurology Specialists office and is not medical advice, a diagnosis, or a treatment recommendation. It does not create a physician-patient relationship. Adults 18 and older. For an active stroke, a first-time or prolonged seizure, sudden severe headache, sudden weakness, sudden vision loss, or a head injury with loss of consciousness, call 911 or go to the nearest emergency department.