Cardiac Device Litigation: What Attorneys Need to Know

Cardiac device cases are among the most technically demanding matters in medical malpractice and product liability litigation. When a pacemaker fails to pace, an ICD delivers an inappropriate shock, or a procedural device contributes to a complication in the cath lab, the legal questions that follow require both clinical precision and medical-legal expertise to evaluate.

In many of these cases, the outcome turns on a narrow set of clinical and technical details that are often misunderstood without the right expert analysis.

This article is written for plaintiff and defense attorneys who handle cardiac device litigation — or who are considering whether a cardiac device claim has merit. It addresses the core medical concepts, the most common legal theories, the questions an expert witness will be asked to address, and what to look for when selecting a cardiologist to serve as your expert.

Cardiac device cases require an expert with direct implantation and management experience — not just general cardiology knowledge. The clinical nuances matter in both liability and causation analysis.

What Are Cardiac Devices?

For the purposes of litigation, cardiac devices fall into three broad categories:

Implantable Devices

• Pacemakers — implanted to regulate abnormally slow or irregular heart rhythms

• Implantable Cardioverter-Defibrillators (ICDs) — implanted to detect and terminate life-threatening arrhythmias through electrical shocks or pacing

• Cardiac Resynchronization Therapy (CRT) devices — pacemakers or defibrillators designed to coordinate the contractions of the heart's chambers in patients with heart failure

• Loop recorders — implantable monitoring devices used to detect arrhythmias over extended periods

Interventional Devices

• Coronary stents — mesh tubes placed inside coronary arteries to keep them open after angioplasty

• Atherectomy devices — used to remove plaque from arterial walls during percutaneous procedures

• Thrombectomy devices — used to remove blood clots, particularly in the setting of acute myocardial infarction or peripheral vascular disease

• Balloon catheters — used during angioplasty to widen narrowed or blocked arteries

Vascular Devices

• Peripheral stents and grafts — used in the treatment of peripheral artery disease

• Inferior vena cava (IVC) filters — implanted to prevent pulmonary embolism in patients at high risk

Each device type presents distinct liability issues, failure modes, and standard-of-care questions. A cardiac device litigator must understand which device is at issue and what kind of expert is best positioned to evaluate it.

The Three Legal Theories in Cardiac Device Cases

Most cardiac device litigation rests on one or more of the following theories:

1. Product Liability — Device Malfunction or Design Defect

When a cardiac device fails to perform as intended — a pacemaker that fails to deliver a pacing pulse, an ICD lead that fractures, or a stent that collapses — the manufacturer may face liability under product liability law. These cases typically require two experts: a cardiologist who can speak to the clinical consequences of the device failure, and a biomedical engineer or device specialist who can address the mechanical failure itself.

Key questions in product liability cases include whether the device performed within its labeled specifications, whether the failure resulted from a manufacturing defect or a design flaw, whether the manufacturer provided adequate warning about known failure risks, and whether adequate device interrogation data exists to reconstruct what the device did or failed to do.

2. Medical Malpractice — Physician Standard of Care

Many cardiac device cases do not involve a manufacturing defect at all. Instead, they involve questions about whether the physician who implanted, programmed, or managed the device met the applicable standard of care.

Physician liability in cardiac device cases typically arises in the following circumstances:

• Inappropriate device selection — implanting a device that was not clinically indicated, or failing to implant one that was

• Implantation technique errors — lead placement in the wrong location, inadvertent perforation, pneumothorax, or failure to achieve adequate thresholds

• Programming errors — device programmed with settings that lead to inappropriate shocks, failure to detect life-threatening arrhythmias, or pacemaker dependency without adequate backup

• Follow-up failures — failure to adequately monitor device function through remote monitoring or in-office interrogation

• Informed consent failures — failure to adequately disclose risks of implantation or the alternatives available

3. Causation — Did the Device Failure or Deviation Cause the Harm?

Even when a device malfunction or a physician deviation is established, the causation analysis can be complex. In cardiac cases, causation often involves competing explanations — the patient's underlying heart disease, comorbidities, or a natural disease course that would have produced the same outcome regardless of the device issue.

An experienced cardiovascular expert witness will evaluate causation by reviewing the full medical record, the device interrogation data, the procedural notes, and the patient's clinical trajectory to form an opinion on whether the device issue was the proximate cause of the claimed harm.

In cardiac device cases, device interrogation data — the electronic record stored in the device itself — is often the most important piece of evidence in the case. Attorneys should request this data early and ensure it is properly preserved and interpreted.

What Evidence Matters in Cardiac Device Cases

Device Interrogation Data

Every implantable cardiac device stores a log of its activity — episodes detected, therapies delivered, sensing data, and battery status. This interrogation data can confirm or refute claims about device malfunction, inappropriate shocks, failure to pace, and detection failures. It is the equivalent of a black box recorder for the heart. Attorneys should ensure this data is obtained and preserved as early as possible in the litigation, as the device may be reprogrammed or replaced before litigation begins.

Operative and Procedural Notes

The implantation report, catheterization laboratory report, and any post-procedure notes document the physician's technique, the measurements taken at implantation, the device settings at the time of implant, and the patient's tolerance of the procedure. Deviations from standard implantation practice are often identifiable in these records.

Device Follow-Up Records

After implantation, patients are typically followed in a device clinic at regular intervals and through remote monitoring. The follow-up records document how the device was performing over time, whether abnormalities were identified, and whether any reprogramming was done. Gaps in follow-up or failure to respond to remote monitoring alerts can be central to liability.

Manufacturer Technical Documentation

In product liability cases, the device's instructions for use (IFU), technical manuals, and adverse event reports filed with the FDA may be critical. These documents establish what the manufacturer represented the device would do, what known failure modes existed, and whether adequate warnings were provided to physicians.

The Patient's Full Medical Record

Causation analysis in cardiac device cases requires a complete picture of the patient's underlying cardiovascular status — prior cardiac history, medication list, prior procedures, ejection fraction, and the clinical indication for the device in the first place. A patient with severe end-stage cardiomyopathy who dies after an ICD shock may have died from their underlying disease rather than from the shock itself. A thorough expert witness will address this directly.

Common Case Scenarios

ICD Inappropriate Shock

An ICD delivers an electrical shock when it detects what it interprets as a life-threatening arrhythmia. When the detection is incorrect — sensing T-waves, lead noise, or atrial fibrillation — the patient receives a painful and potentially harmful shock that was never medically necessary. These cases involve both device programming questions (were the detection parameters set appropriately?) and physician follow-up questions (were prior warning signs addressed?).

Pacemaker Failure to Pace

A pacemaker that fails to deliver a pacing pulse in a pacemaker-dependent patient can cause syncope, cardiac arrest, or death. These cases require examination of the implantation technique, the lead integrity, the programming parameters, and whether the failure was identifiable through routine monitoring before the clinical event.

Coronary Stent Complication

Complications following coronary stent placement — including stent thrombosis, dissection, or restenosis — may involve questions about stent selection, deployment technique, anticoagulation management, and post-procedure care. Distinguishing a procedural complication from an inherent risk of the procedure is a central expert witness function in these cases.

Atherectomy or Thrombectomy Device Injury

Devices used to remove plaque or clot from coronary or peripheral arteries carry specific risks including vessel perforation, embolization, and no-reflow phenomenon. When these complications arise, the expert witness must evaluate whether the physician's technique met the standard of care and whether the device was used within its labeled indications.

What to Look for in a Cardiac Device Expert Witness

Not every cardiologist is qualified to opine on cardiac device cases. The ideal expert has the following qualifications:

• Active or recent clinical experience with the specific device type at issue — general cardiologists who have never implanted a pacemaker or performed an interventional procedure are not well-positioned to opine on implantation technique

• Board certification in interventional cardiology or cardiac electrophysiology, depending on the device at issue

• Familiarity with device interrogation data — the ability to interpret stored electrograms, episode logs, and programmed parameters

• Experience with both plaintiff and defense work — an expert who only works for one side is more likely to be challenged on bias

• Clear communication skills — the ability to explain complex cardiac physiology and device function to a judge and jury without relying on jargon

An expert who can tell you what the device was supposed to do, what it actually did, whether the physician's management met the standard of care, and whether the outcome was caused by the device issue — not just one of those questions — is the expert you want.

A Note on Telemedicine Cardiac Device Cases

As remote cardiac monitoring expands, a new category of device litigation is emerging: cases involving the failure to respond to remote monitoring alerts. Many patients with implanted devices are now monitored continuously through wireless transmission to device clinic servers. When a clinically significant alert — a lead fracture, a detection episode, a battery depletion warning — is transmitted and not acted upon in a timely manner, the resulting harm may give rise to both standard-of-care and systems-based liability claims.

These cases require an expert who understands not only the device itself but the remote monitoring workflow, the alert protocols, and the physician's obligation to respond to transmitted data.

Conclusion

Cardiac device cases are technically demanding but highly winnable for both plaintiff and defense when the right expert is retained early. The key is understanding which legal theory is at issue — product liability, physician malpractice, or both — and identifying an expert with the specific clinical background to address the device, the procedure, and the causation analysis.

If you are evaluating a cardiac device case and would like a preliminary assessment, I am available to review records and provide an initial opinion.

 ABOUT THE AUTHOR  

Jasdeep Dalawari, MD FACC FSCAI FSVM is a board-certified interventional cardiologist with six specialty certifications, including interventional cardiology, cardiovascular diseases, endovascular medicine, and emergency medicine. He has provided independent medical-legal opinions and expert testimony in cardiovascular cases since 2008, working for both plaintiff and defense counsel across the United States. He is licensed in 29 states and accepts cases nationwide.

CardioMedLegal.com  |  jsdmd@cardiomedlegal.com  |  (804) 991-4109