Chapter 65: Spinal Cord & Peripheral Nerve Problems

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Welcome to the Deep Dive, your express lane to becoming truly well -informed.

Today, we're taking a critical look at Chapter 65 of Lewis's Medical Surgical Nursing.

That's right.

Our mission to really distill the often dense world of spinal cord and peripheral nerve problems.

Make it clear, actionable for you, our dedicated nursing students.

We want you prepared not just for exams, but for the real world of patient care.

Exactly.

And this chapter, it's just foundational nursing knowledge.

It covers conditions that are incredibly profound, really life altering for patients.

So our goal isn't just to list facts.

It's to unlock those

moments.

I like that.

Yeah.

Showing you why this knowledge is so crucial for making a real difference in patient outcomes from that immediate acute phase right through to rehab.

Absolutely.

Think of this deep dive as, well, a guide, understanding the nervous system's resilience, but also its vulnerability.

Sometimes we'll break down everything from traumatic spinal injuries, autoimmune issues, infections.

Yeah.

We'll guide you through the key pathophysiology, the vital assessments, and most importantly, those essential nursing interventions you'll need.

So let's start with a topic that carries immense weight,

spinal cord injury, SCI.

Thousands of lives drastically changed every year.

And it's not just medical, is it?

It's a profound shift in a person's whole world.

It truly is.

And when we talk about the etiology and pathophysiology of SCI, trauma is almost always the driver.

The motor vehicle collisions, those are the big ones.

Right.

But also violence, sports injuries, they play a part too.

And the damage, it unfolds in two key phases.

First, you have the primary injury.

That's the immediate physical hit.

Like a bone fragment.

Exactly.

Or maybe a penetrating wound tearing the cord or just cutting off blood supply.

It happens instantly.

But then comes the secondary injury.

And this is often the real danger.

It's insidious.

Insidious.

How so?

Well, it's this progressive cascade.

Stuff happening hours, days, even months after the initial hit.

Think swelling, lack of oxygen, inflammation, it all just spirals, causing more cell death, damaging the myelin sheath.

And the secondary damage, it can become permanent really fast, sometimes within 24 hours.

Wow, 24 hours.

Yeah.

So understanding it, trying to mitigate it, that's a huge nursing priority.

That secondary injury idea is so important.

And speaking of critical concepts, let's untangle two types of shock in SCI that often, you know, trips students up.

Spinal shock versus neurogenic shock.

Can you break down the core difference?

Absolutely.

Let's start with spinal shock.

Think of it as temporary.

It's a physical response right after the trauma.

The spinal cord basically just shuts down in protest.

You see a complete loss of reflexes, sensation, movement below the injury level.

Complete loss.

Temporarily, yes.

It can last days, weeks, maybe.

And here's the key thing for nurses.

It can mask the patient's true underlying neurologic function.

Makes the initial assessments really tricky.

Okay, so that's spinal shock.

What about neurogenic?

Neurogenic shock is totally different.

It's a hemodynamic problem, a blood flow issue.

You typically see it with higher injuries, cervical or high thoracic, T6 or above.

Why T6?

Because that's where you lose sympathetic nervous system, control the fight or flight system.

So the parasympathetic rest and digest takes over completely unopposed.

This leads to massive vasodilation, blood cools out in the limbs, cardiac output drops, key signs, really significant hypotension like BP under 90 systolic, bradycardia, so a slow heart rate,

and problems regulating body temp.

And here's the kicker,

that low blood pressure can actually worsen the secondary injury to the spinal cord.

It's a vicious cycle.

Okay, got it.

So spinal shock, temporary cord shutdown, neurogenic shock, systemic blood pressure crisis that harms the cord further.

Makes sense.

Now, SCI classification is also vital, right, for anticipating needs.

Definitely.

We classify SCI in three main ways, mechanism, level and degree.

Mechanism.

Yeah, mechanism of injury, like how did it happen?

A flexion rotation injury that twisting motion is often the most unstable.

It usually leads to severe deficits.

Then there's level of injury.

Simply put, the higher up the injury on the cord, especially cervical, the bigger the impact.

Unbreathing, arm movement.

Exactly.

A C1 to T1 injury can cause tetraplegia, all four limbs affected.

And bribing is often compromised at C4 or above because of the phrenic nerve.

And lower down.

Below T2, you're generally looking at paraplegia, affecting legs primarily.

And finally, degree of injury.

Is it complete, meaning total loss of motor and sensory function below the injury?

Or is it incomplete, where some nerve tracks are spared?

You get this mixed picture of function and sensation.

Like those specific syndromes.

Right.

Like central cord syndrome, often more weakness in the arms than legs, common after hyperextension injuries.

Or Brown -Siquard syndrome.

That one's fascinating.

Damage to half the cord.

The crossed wires one.

That's a great way to think of it.

You lose motor function on the same side as the injury, but you lose pain and temperature sensation on the opposite side.

Wow.

Knowing these patterns really helps you anticipate specific challenges your patient will face.

Definitely helps remember it.

So with all these different injury types, what clinical manifestations are most critical for nurses to assess?

What hits the patient hardest immediately?

Well, number one, often the leading cause of morbidity and mortality is the respiratory system.

Because of breathing muscles.

Precisely.

If the injury is C4 or higher,

the phrenic nerve controlling the diaphragm can be knocked out.

Breathing is severely compromised.

Even lower cervical or thoracic injuries weaken those abdominal and intercostal muscles.

So the patient can't cough effectively.

And that leads to?

Big problems.

A weak cough isn't just annoying.

It's a flashing red light.

It signals impending respiratory failure, aspiration risk, pneumonia, atelectasis.

So you're constantly monitoring O2 sats, listening to breath sounds, checking if they're using accessory muscles to breathe.

Makes sense.

What about cardiovascular?

For the cardiovascular system, especially with those injuries above T6, you're watching for that severe

hypotension from neurogenic shock.

Your goal is maintaining that systolic BP above 90 millimillis G.

Keep the core perfused.

Okay.

And urinary?

The urinary system almost always involves neurogenic bladder.

The bladder just doesn't work right.

Can't store properly, can't empty properly.

Big risks for over -distention, incontinence, UTIs, and eventually kidney damage if it's not managed meticulously.

And the gut?

The gastrointestinal system slows right down to neurogenic bowel, gastric distention, risk of paralytic alias, constipation, imbaction.

It's a major focus.

And beyond those big systems, what else are nurses watching closely?

Critically important.

The skin.

Immobility plus loss of sensation equals massive risk for pressure entry.

To constant vigilance.

Your skin assessments, your repositioning schedule, it's literally life -saving.

Also, poikilothermia.

Poikilothermia.

Basically, patients with SEI can't regulate their core body temperature below the injury level.

No sweating, no shivering effectively.

They essentially take on the temperature of the room.

So you need to manage their environment carefully.

Ah, okay.

Keep the room stable.

Exactly.

And finally, don't forget pain.

It's a huge issue for many.

It can be musculoskeletal pain or that awful burning, tingling neuropathic pain from the nerve damage itself.

So much to manage.

Given all this complexity, what's the interprofessional care approach right after injury?

What are the immediate priorities?

Okay, pre -hospital phase.

Absolute first priority.

ABCs, airway, breathing, circulation, plus rigidly preventing any further injury.

That means strict spinal motion restriction.

Rigid cervical collar, backboard, the works, until it's fully cleared, usually by imaging.

And get them to the right place fast.

Rapid transport to a specialized trauma center is key.

Then, in acute care, it's secure the airway intubation if needed, keep O2 sats above 92 percent, and keep that systolic BP above 90 millimillers G.

MAP ideally above 85, often using ID fluids, maybe vasopressors like phenolephrine or norepinephrine to fight that neurogenic shock.

And assessments.

A complete neurologic assessment using standardized tools like the ASIA impairment scale.

You'll do this repeatedly.

Muscle groups, sensory checks, stabilization comes next.

Could be non -operative, like skeletal traction to realign the spine.

Or it might be surgical decompression, fixation with hardware.

Early surgery is often preferred now for certain injury types.

What about drugs?

Well, drug therapy.

Low molecular weight heparin, like an oxaparin, is standard for VTE prevention.

Very high risk.

Vasopressors, as we said, keep the MAP up.

Methylprednisolone, the steroid, used to be routine, but the evidence is really mixed now, so you might not see it as often.

Practice varies.

Okay, so that's the stage.

Then nursing management really takes center stage, right?

Where do nurses focus first?

Absolutely.

Your assessment is ongoing, holistic.

From how the injury happened to how the patient's coping.

Your planning centers on optimizing neurologic function, preventing complications of immobility, and promoting self -care as much as possible.

In acute care, immobilization is paramount.

Maintaining that neutral neck position.

Maybe garter wells, tongs, or a halo vest for cervical injuries.

A halo vest looks intense.

It is.

And pin site care is crucial, using chlorhexidine usually, watching for infection.

With any immobilization, the absolute rule is log rolling.

Keep the spine aligned.

Move the patient as one unit.

Got it.

Log roll.

What about breathing?

Respiratory problems.

Constant monitoring.

Breath sounds.

ABGs.

Effort.

Aggressive secretion management is key.

Suctioning if needed.

Chest physiotherapy.

Maybe associate coughing techniques.

Incentive spirometry.

Keep those airways clear.

And the heart.

Cardiovascular instability.

Frequent vitals.

Treating symptomatic bradycardia, maybe with atropine.

Maintaining that target blood pressure.

Managing orthostatic hypotension when they start to mobilize binders.

Compression stockings.

Careful position changes.

And rigorous VTE prevention.

LMWH.

Range of motion exercises.

Okay.

Fluids, nutrition.

Fluid and nutrition.

If there's Ileus and NG tube initially.

But you want to start nutrition support early.

Within 72 hours, usually.

High protein, high calories is the goal.

And always get a formal swallow evaluation before they eat or drink anything orally.

Makes sense.

And the bladder and bowel.

These seem like huge nursing challenges.

For bladder management, an indwelling catheter is difficult right at first.

But the long -term goal is usually clean intermittent catheterization, or CIC.

Teaching the patient or caregiver to catheterize on a schedule, maybe 4 -6 times a day.

Keeping bladder volumes low helps prevent UTIs and kidney issues.

For bowel management, it's about establishing a regular program.

High fiber diet.

Plenty of fluids.

Consistent timing.

Often after a meal to utilize the gastrocolic reflex.

Maybe stool softeners or a rectal stimulant.

The goal is predictable emptying, preventing constipation and impaction.

Right.

What else is on the nurse's plate?

Oh, plenty.

Managing temperature, that pochelothermia.

Preventing stress ulcers, often with meds like PPIs.

Addressing sensory deprivation.

Finding ways to stimulate them above the injury level.

Managing pain.

And of course, meticulous skin care.

Daily checks, especially over bony areas.

Repositioning every two hours religiously, using pressure relieving mattresses or cushions.

It's non -stop.

It really sounds like it.

Now, let's talk autonomic dysreflexia.

You mentioned it earlier.

This sounds like one of those know this cold emergencies.

Absolutely.

100 % is.

Autonomic dysreflexia, or AD, is life threatening.

A massive uncontrolled cardiovascular reaction.

Usually happens in patients with injuries at T6 or higher.

What triggers it?

It's triggered by some kind of irritating or painful stimulus below the level of the injury.

Something the patient can't feel in the usual way.

Think of it like the sympathetic nervous system below the injury, just goes haywire, sending out these massive vasoconstriction signals.

But the brain can't shut it off because of the SCI.

Okay, so what does it look like?

The manifestations.

Sudden, severe, throbbing headache is classic.

Blood pressure spikes dramatically, like 20 -40mm OHD or more above their baseline.

Marked sweating and flushing above the level of injury.

But below the injury, they might be pale, cool, have goosebumps.

Bradycardia is common, too.

The body tries to slow the heart down to compensate for the high BP.

Blurred vision, nasal congestion, anxiety.

Wow.

Okay, so immediate interventions.

What do you do first?

First thing,

sit them up.

Elevate the head of the bed to 45 degrees or get them into a sitting position.

This uses gravity to help lower the blood pressure immediately.

Second, find and eliminate the cause.

Now, the most common culprit by far is a distended bladder.

So check the catheter.

Instantly.

Check for kinks, blockage.

Irrigated if needed.

If they don't have a catheter, you may need to do a straight cath immediately, but use lidocaine jelly because the catheterization itself can initially worsen AD.

The next most common cause is a distended rectum or impaction.

You'd need to do a digital check, but again, use anesthetic ointment first.

Also, check for tight clothing, constricting devices, skin broke down, anything irritating below the injury level.

Remove it.

And if that doesn't work?

You notify the healthcare provider immediately.

They may need rapid onset, short duration antihypertensive medication,

and patient caregiver education about recognizing triggers and symptoms is absolutely essential for prevention and quick action at home.

That's incredibly important information.

Okay, that's a huge amount on SCI, but understanding that really empowers nurses.

Let's shift gears quickly now to spinal cord tumors.

How does the nursing focus differ here?

Well, the big difference is the onset.

Unlike the sudden trauma of SCI, spinal cord tumors usually grow slowly.

They can be primary starting in the cord or nerves or secondary, meaning metastatic from cancer elsewhere.

Like breast or lung cancer.

Exactly.

Prostate, kidney too.

The symptoms often back pain that gets worse with activity or lying down, maybe radiating pain, weakness, clumsiness, sensory changes, they come on gradually from the tumor compressing the cord or nerve roots.

The key insight for nursing is that because it's often slow, if it's diagnosed and removed early, especially primary tumors, there's a much better chance for significant or even complete functional recovery compared to acute SCI.

So the care is similar in terms of managing deficits, but the prognosis can be better if caught early.

Right.

Nursing focuses heavily on detailed neurologic assessments to track changes, managing pain, which can be severe, and preparing patients and families for potential surgery, radiation, or chemotherapy.

Managing the resulting neurologic deficits is similar to SCI care.

Okay, that makes sense.

Now, moving away from the spinal cord itself, let's touch on a couple of common cranial nerve disorders, trigeminal neuralgia and Bell's palsy.

What are the key nursing takeaways?

Okay, trigeminal neuralgia or TN, sometimes called tic -du -le -ro,

think excruciating facial pain.

It's sudden stabbing, burning, lightning -like pain along the trigeminal nerve branches, lips, gums, cheek, forehead.

What triggers it?

Often, very light touch, chewing, brushing teeth, cool breeze, washing the face, talking, even smiling.

Patients become terrified of triggering it.

Oh, that sounds awful.

It's truly debilitating.

Nursing priority number one is pain management, usually with anti -seizure drugs like carbamazepine or oxcarbazepine.

Opioids often don't work well for this type of pain.

Then it's helping the patient identify and avoid their specific triggers.

Environmental control, like avoiding drafts, ensuring adequate nutrition and hydration, because eating can be agony.

Meticulous oral hygiene with soft brushes.

And Bell's palsy, how is that different?

Bell's palsy is quite different.

It's an acute, usually temporary, one -sided facial paralysis or weakness.

It comes on suddenly.

We think it's often due to inflammation, maybe viral, like herpes simplex, affecting the facial nerves, CNZ, feminine.

The face droops on one side, corner of the mouth, eyelid.

They might drool, have trouble closing the eye, maybe changes in taste or hearing on that side.

So what's the biggest nursing concern there?

Eye protection, absolutely critical.

Because they can't blink or close the eye fully, the cornea is at risk of drying out, scratching, infection.

So artificial tears.

Yes, frequent artificial tears during the day, lubricating ointment and maybe an eye patch or taping the eyelids shut at night.

Dark classes for protection, teaching them to report any eye pain immediately.

Otherwise, care is supportive.

Maybe corticosteroids if caught early, sometimes antivirals.

Facial massage or exercises.

And importantly, reassurance, most people recover fully, usually within six months.

Good to know, there's usually a good prognosis.

Okay, let's broaden out again to some polyneuropathies, starting with Guillain -Barre syndrome, GBS.

Right, GBS, this is an autoimmune condition.

The body's immune system mistakenly attacks the peripheral nerves, specifically the myelin sheath, usually.

It often follows a viral or bacterial infection by a few weeks.

And what does it look like clinically?

The classic picture is acute, rapidly ascending, symmetrical weakness.

Starts in the legs, moves up.

Patients might notice tingling first, then weakness, then paralysis.

Reflexes are decreased or absent.

Ascending, so it can affect breathing.

That is the most serious complication and the highest nursing alert.

If that paralysis ascends to the nerves controlling the chest and diaphragm, you get respiratory failure.

Many patients require mechanical ventilation.

Wow, so critical care is often needed.

Often, yes, in the ICU.

Care is supportive ventilation, managing autonomic dysfunction like wild swings in blood pressure or heart rate, preventing VTEs and pressure injuries.

Treatments aim to shorten the severity and duration like plasma exchange, plasma freezes, or high -dose 5E immunoglobulin IV.

Especially started early.

So nurses are doing intense monitoring.

Intense continuous monitoring of respiratory status, vital capacity, negative inspiratory force plus motor function, sensory levels, reflexes, vital signs, cardiac rhythm.

It's very hands -on.

Okay, and briefly, what's the difference with chronic inflammatory demyelinating polyneuropathy, CIDP?

CIDP is like GBS's chronic cousin.

Also autoimmune, attacks the myelin.

But the key difference is the onset.

GBS is acute, rapid.

CIDP is gradual, develops over eight weeks or more.

And it doesn't just go away on its own.

No, it's not self -limiting like GBS often is.

Patients typically need ongoing treatment, IVAG, corticosteroids, maybe plasma exchange, often long -term maintenance therapy to prevent relapses and minimize permanent nerve damage.

Early diagnosis is key.

Got it.

Gradual onset, chronic course.

Okay, one last one.

Thankfully less common now due to vaccination, tetanus.

Tetanus or lockjaw.

Caused by a neurotoxin from Clostridium titani bacteria found in soil and manure.

Gets in through wombs, even minor ones.

The toxin interferes with inhibitory nerves in the CNS, leading to sustained painful muscle contractions and spasms.

Lockjaw is the classic sign.

Yeah, starts often with jaw stiffness, difficulty swallowing, maybe that creepy sardonic smile from facial muscle spasms.

Then it progresses neck rigidity, severe arching of the back, opus satinus, abdominal rigidity.

The real danger is laryngeal spasm or respiratory muscle spasm leading to apnea.

It's agonizing and life -threatening.

So prevention is everything.

Absolutely.

Prevention through routine tetanus immunization, those boosters every 10 years, and thorough cleaning of any wound.

That's the message.

If it does happen, it's a true medical emergency.

Requires hospitalization, tetanus immune globulin, TIG, to neutralize the toxin, potent muscle relaxants, often sedation and mechanical ventilation, antibiotics.

It's a tough course.

Wow, what an incredible amount of ground we've covered today from the profound impact of SCI and all its complex nursing management.

Right, through spinal tumors, those distinct cranial nerve issues like TN and Bell's palsy.

And then the polyneuropathies like GBS, CADP, and the seriousness of tetanus.

It's a huge landscape.

It really is.

But what we hope you take away is not just a list of symptoms or tasks.

It's about understanding the why behind the what, grasping the pathophysiology, knowing your priority assessments, thinking critically about interventions, and always, always focusing on holistic, compassionate care and education for your patients and their families.

That really is the core of nursing, isn't it?

It's the bedrock.

This knowledge allows you to anticipate, to act effectively, to advocate.

So as you, our listener, move forward in your nursing journey, encountering these diverse neurological challenges, ask yourself, how will you use this foundation?

How will you advocate, spot those subtle changes, and keep adapting your care as you learn more?

Keep asking questions.

Absolutely.

Thank you so much for joining us on this Deep Dive.

Keep that curiosity burning, and we'll catch you next time.