Nerve Block Injuries and Local Anesthetic Toxicity: When a Regional Anesthesia Complication Is Malpractice in Florida

Modern anesthesia has advanced a great deal over the past two decades, and regional anesthesia is one of its most important gains. A well-placed peripheral nerve block can numb a shoulder, knee, or hip for hours, reduce the need for opioids, and let a patient wake from surgery more comfortably than general anesthesia alone allows.

That said, every nerve block means placing a needle beside a nerve and injecting a drug that becomes dangerous at the wrong dose or in the wrong place. When something goes wrong — a burning, numb limb that never recovers, or a seizure and cardiac arrest minutes after the injection — patients and families are left asking whether the outcome was an unavoidable risk or a preventable error.

We understand how disorienting that question can be, especially when the block was presented to you as a comfort measure rather than a procedure with serious risks. This guide explains how peripheral nerve block injuries and local anesthetic systemic toxicity (LAST) happen, what the standard of care requires, and how Florida's Chapter 766 pre-suit process applies to these claims.

It is one part of our broader anesthesia error malpractice library, which also covers related harms such as anesthesia awareness during surgery. Keep in mind that every case depends on its own records, so treat what follows as education rather than a verdict on your situation.

A peripheral nerve block places local anesthetic, usually bupivacaine, ropivacaine, or lidocaine, around a nerve or group of nerves that supplies the surgical site. The drug blocks nerve signals for hours, and some blocks are extended for days through a continuous catheter connected to an infusion pump.

Common blocks performed in Florida operating rooms and ambulatory surgery centers include but are not limited to:

• Interscalene and supraclavicular blocks. These target the brachial plexus for shoulder and upper-arm surgery, near the phrenic nerve, the lung, and major blood vessels.
• Femoral and adductor canal blocks. These are used for knee and hip procedures, and they can affect quadriceps strength and raise fall risk after surgery.
• Popliteal sciatic blocks. These cover foot and ankle surgery from behind the knee.
• Fascial plane blocks. Transversus abdominis plane (TAP) and erector spinae blocks deliver large volumes of anesthetic into tissue layers, which matters for total-dose calculations.

All of these blocks can cause harm in two main ways. Each one has its own mechanisms, warning signs, and legal questions.

Peripheral Nerve Injury

Nerve injury after a block can show up as numbness, tingling, burning pain, weakness, or loss of function that lasts well beyond the expected duration of the anesthetic. Most post-block symptoms resolve over weeks to months, but some patients are left with permanent deficits that change how they work, sleep, and live.

Recognized mechanisms of block-related nerve injury include:

• Intraneural or intrafascicular injection. Injecting directly into the nerve bundle, rather than around it, can damage the fibers and their blood supply.
• High injection pressure. Pushing anesthetic against strong resistance is associated with intrafascicular placement and nerve damage.
• Direct needle trauma. Repeated passes or advancing the needle without clear visualization can injure the nerve mechanically.
• Neurotoxicity and ischemia. Concentrated anesthetic, epinephrine-related vasoconstriction, and prolonged pressure can compromise an already-vulnerable nerve.

Note that surgery itself, tourniquet time, and patient positioning can also injure nerves. This is why causation, not just the fact of an injury, sits at the center of every nerve block case.

Local Anesthetic Systemic Toxicity (LAST)

LAST happens when local anesthetic reaches the bloodstream at levels high enough to affect the brain and heart. It can follow an accidental injection into a blood vessel, rapid absorption from a highly vascular site, or a cumulative dose that exceeds safe limits.

Early warning signs often involve the central nervous system, and they may progress quickly. These include:

• Neurologic symptoms. Metallic taste, numbness around the mouth, ringing in the ears, dizziness, confusion, agitation, and seizures.
• Cardiovascular symptoms. Low blood pressure, slow or abnormal heart rhythms, and in severe cases cardiovascular collapse or cardiac arrest.

Bupivacaine in particular is known for its cardiotoxicity, and resuscitation after bupivacaine-related arrest can be prolonged and difficult. As a result, the minutes between the first symptom and the first rescue intervention often determine whether a patient survives without brain injury.

Florida measures every medical malpractice claim against the prevailing professional standard of care in § 766.102, Florida Statutes. That is the level of care, skill, and treatment that reasonably prudent similar health care providers recognize as acceptable and appropriate under the circumstances.

In regional anesthesia, that standard is shaped by published guidance, most notably the American Society of Regional Anesthesia and Pain Medicine (ASRA) practice advisory on LAST and its accompanying treatment checklist. Keep in mind that a guideline is evidence of the standard, not the standard itself — qualified experts testify about how it applies to your specific block.

Dosing

Safe dosing starts before the needle touches the skin. The provider should calculate a maximum dose based on the drug, the concentration, the patient's weight, and risk factors such as advanced age, heart disease, kidney or liver impairment, and pregnancy.

Recognized safeguards for dosing include:

• Using the lowest effective dose. Volume and concentration should match the block's purpose rather than defaulting to a fixed large dose.
• Incremental injection. Anesthetic is typically injected in small aliquots with pauses and aspiration in between, so intravascular placement can be caught early.
• Intravascular markers. Many practitioners add epinephrine as a test marker, since a sudden rise in heart rate can signal injection into a vessel.
• Tracking cumulative dose. If a surgeon also infiltrates the wound with local anesthetic, the anesthesia team and surgeon should account for the combined total.

That last point is a frequent source of preventable toxicity. Two providers can each give a reasonable dose, and the combined total can still put a patient over the limit — a failure in communication that overlaps with broader medication dosing errors.

Ultrasound Guidance and Injection Technique

Ultrasound guidance lets the provider see the needle, the nerve, nearby vessels, and the spread of anesthetic in real time. ASRA's guidance recognizes that ultrasound can reduce the risk of LAST, although it does not eliminate nerve injury, and the technique still depends on the operator's skill.

Technique-related expectations commonly include:

• Keeping the needle tip visible. Advancing a needle the provider cannot see increases the risk of nerve puncture and vascular injection.
• Responding to warning signs. Severe pain, a sharp paresthesia, or high resistance on injection should prompt the provider to stop and reposition.
• Monitoring injection pressure. Some practitioners use pressure monitoring or nerve stimulation alongside ultrasound as an added safeguard.
• Documenting the block. A thorough note records the drug, concentration, volume, needle, approach, images, patient responses, and sedation level.

Monitoring and Rescue Readiness

A block is not finished when the needle comes out. Patients should receive standard monitoring, including pulse oximetry, electrocardiogram, and blood pressure, during and after the injection, with a period of close observation because toxicity can be delayed.

Just as important, rescue equipment must be ready before the block begins. Expected resources include:

• Lipid emulsion 20%. This is the recognized antidote-style therapy for LAST, and it should be immediately available wherever blocks are performed.
• Airway and seizure management. Oxygen, airway equipment, and benzodiazepines should be on hand to manage seizures quickly.
• Modified resuscitation protocols. LAST-specific resuscitation uses reduced epinephrine doses and avoids certain drugs, so the team should know the ASRA checklist.
• Escalation planning. Facilities should have a plan for prolonged resuscitation, including access to cardiopulmonary bypass where available.

For continuous catheters, monitoring continues on the floor or at home. Nurses and patients need clear instructions on the warning signs of toxicity, catheter migration, and pump malfunction, plus a way to reach the anesthesia team.

Not every bad outcome is malpractice. Nerve injury and LAST are both recognized risks of regional anesthesia, and they can happen even when a provider does everything right.

What turns a complication into a viable claim is the combination of breach, causation, and damages. In other words, the provider deviated from the standard of care, that deviation caused the injury, and the injury produced real losses.

Patterns that may point toward a deviation include:

• Dose errors. A total dose above recognized limits for the patient's weight and risk profile, or failure to account for surgeon-administered anesthetic.
• Ignoring warning signs. Continuing to inject despite severe pain, paresthesia, or high resistance.
• Inadequate visualization. Performing a block without ultrasound or other guidance in circumstances where qualified experts would expect it.
• Delayed recognition of LAST. Misreading early neurologic symptoms as anxiety and waiting until the patient seizes or arrests.
• Missing rescue drugs. Lipid emulsion that was not stocked, could not be found, or was not given promptly.
• Poor follow-up. Dismissing persistent numbness or weakness after the block wore off, which can delay diagnosis and rehabilitation.

All of these patterns turn on the records. Ultrasound images, the block note, the anesthesia record, medication administration logs, and the electronic audit trail often show exactly what was given, when, and by whom.

Informed consent can also matter. If you were not told about recognized risks such as nerve injury, phrenic nerve paralysis after an interscalene block, or a collapsed lung after a supraclavicular block, a separate claim may exist, which we explain in our guide to informed consent for surgery.

Who May Be Liable

More than one party may share responsibility for a regional anesthesia injury. Depending on the facts, potential defendants include:

• The anesthesiologist. The physician who planned, performed, or supervised the block.
• A certified registered nurse anesthetist (CRNA). Florida's supervision rules affect how responsibility is divided, as covered in our guide to CRNA supervision.
• The surgeon. Particularly if the surgeon added local anesthetic without coordinating the total dose.
• The hospital or surgery center. For failing to stock rescue drugs, train staff, or monitor patients with continuous catheters.

Keep in mind that public hospitals may be protected by sovereign immunity limits under § 768.28, Florida Statutes, which carries its own notice requirements. Our article on suing a Florida hospital walks through those differences, and you should confirm with counsel how they apply to your facility.

Florida does not allow a medical malpractice lawsuit to be filed right away. Chapter 766 requires a structured pre-suit investigation first, and missing a step can end an otherwise valid claim.

The process generally moves through the following stages:

• Gathering records. Your attorney obtains the complete anesthesia, surgical, nursing, and pharmacy records, along with ultrasound images and audit trails where they exist.
• Expert corroboration. Under § 766.203, Florida Statutes, the claimant must obtain a verified written opinion from a qualified medical expert corroborating reasonable grounds for the claim.
• Notice of intent. Under § 766.106, the notice of intent to initiate litigation, with the expert opinion, is served on each prospective defendant.
• The 90-day investigation period. The defendants and their insurers investigate the claim, and the parties may exchange informal discovery, including unsworn statements and records.
• The response. Before the period ends, a defendant may reject the claim, make a settlement offer, or offer to arbitrate damages.

For regional anesthesia claims, the expert's specialty matters a great deal. An anesthesiologist with regional anesthesia experience is typically best placed to explain dosing, technique, and rescue standards, while a neurologist or physiatrist may be needed to address the nature and permanence of a nerve injury.

Filing Deadlines

Florida's medical malpractice statute of limitations appears in § 95.11(4)(b), Florida Statutes — confirm the current subsection lettering with counsel, since the statute has been amended in recent years. Generally, a claim must be brought within two years of when the injury was discovered or should have been discovered, and no more than four years from the date of the incident.

Limited exceptions apply, including extensions where fraud or concealment prevented discovery and special rules for young children. Serving a notice of intent tolls the limitations period during the pre-suit window, and our guide to the Florida malpractice filing deadline explains these rules in more detail.

Nerve injuries can create a specific timing trap. Because many post-block symptoms resolve on their own, patients often wait, and by the time a deficit is clearly permanent, much of the two-year window may have passed.

In the aftermath of a regional anesthesia complication, your first priority is your health. That said, a few steps taken early can protect both your recovery and your legal options.

Here is a list of the steps you may want to consider:

• Get a neurologic evaluation. Ask for a referral to a neurologist, and ask whether nerve conduction studies or electromyography are appropriate as your symptoms evolve.
• Keep a symptom journal. Record numbness, weakness, pain levels, and how the injury affects your work and daily activities.
• Request your records. Ask for the complete anesthesia record, the block procedure note, and any ultrasound images.
• Write down what you remember. Note any pain or shock-like sensations during the injection, symptoms you reported, and how staff responded.
• Speak with a malpractice attorney early. Pre-suit investigation takes time, and early review protects you against the limitations deadline.

If a loved one suffered seizures, cardiac arrest, or brain injury after a block, the same steps apply. Florida law may also permit a wrongful death claim on behalf of surviving family members if a loved one did not survive — confirm eligibility with counsel, as Florida limits who may recover in certain medical negligence cases.

Our Miami Anesthesia Malpractice Attorneys Are Here to Help

A nerve block injury can take away the use of a hand, the ability to walk without support, or years of pain-free life. LAST can be even more catastrophic, leaving families to cope with brain injury or the sudden loss of someone they love after what was meant to be a recovery-friendly procedure.

We understand that nothing can fully undo that harm, and we also know that you may be entitled to compensation for medical expenses, lost wages, and pain and suffering. Our team works with experienced anesthesiology and neurology experts to review the dosing, technique, monitoring, and rescue response in your case.

Do you believe a nerve block or local anesthetic reaction harmed you or your family? We welcome the opportunity to review your records and help you determine the next steps — free consultation, no fee unless we recover.

This article is for informational purposes and does not constitute legal or medical advice. Consult a qualified attorney licensed in Florida about your specific situation.