Trial now over 60% enrolled with 125 of 200 anticipated patients

Recent new site activation brings total clinical trial sites to 16

Interim analysis of first 100 patients remains on track for 3Q 2025

DENVER, Aug. 06, 2025 (GLOBE NEWSWIRE) -- SeaStar Medical Holding Corporation (Nasdaq: ICU), a commercial-stage healthcare company focused on transforming treatments for critically ill patients facing organ failure and potential loss of life, announced today that it has successfully reached enrollment of 125 patients in the NEUTRALIZE-AKI pivotal clinical trial. Additionally, it has activated Methodist Hospital Metropolitan of San Antonio, Texas, as its 16 th clinical trial site.

The company also reported that it remains on track to receive results from the per protocol prespecified interim analysis of the first 100 patients in the trial in the third quarter of 2025. The analysis is being conducted by the trial’s independent Data Safety Monitoring Review Board (DSMB). The company intends to disclose to its stakeholders only the top-line decision from the analysis by the DSMB to preserve the integrity to the ongoing trial.

“We are very pleased to reach this new enrollment milestone in the NEUTRALIZE-AKI pivotal trial,” stated Kevin Chung, MD, Chief Medical Officer of Sea Star Medical. “We are also thrilled to welcome Methodist Hospital Metropolitan as a key addition to our clinical trial sites. Its affiliate, Methodist Hospital, is one of our highest enrolling sites, and we believe their shared research teams and recruitment efforts should enable expedited recruitment and enrollment of patients in the NEUTRALIZE-AKI pivotal trial.”

Dr. Chung continued, “With respect to our upcoming interim analysis, the NEUTRALIZE-AKI pivotal trial is rigorously powered to detect a true efficacy signal, and confirming safety remains a top priority. This interim analysis seeks to validate the therapy’s safety profile and efficacy potential – critical factors in supporting a DSMB recommendation to proceed to full trial completion.”

A complete list of the NEUTRALIZE-AKI pivotal clinical trial sites can be viewed on ClinicalTrials.gov and includes notable institutions, such as Cleveland Clinic, Mayo Clinic, and Stanford Medical Center. The 16 clinical trial sites that are participating in the trial are clearly aware of the high unmet need of patients with AKI requiring CRRT. SeaStar Medical is grateful for their active participation in the trial.

About the NEUTRALIZE-AKI Pivotal Clinical Trial

NEUTRALIZE-AKI (NEUTRophil and monocyte deActivation via SeLective Cytopheretic Device – a randomIZEd clinical trial in Acute Kidney Injury) is a pivotal trial that is expected to enroll up to 200 adult patients with AKI requiring CRRT. The trial’s primary endpoint is a composite of 90-day mortality or dialysis dependency of patients treated with SCD in addition to CRRT as the standard of care, compared with the control group receiving only CRRT standard of care. The trial has enrolled 125 of 200 total anticipated patients. The per protocol interim analysis of the first 100 patients on the trial’s 90-day primary endpoint is being conducted by the trial’s independent DSMB. Secondary endpoints of the trial include mortality at 28 days, ICU-free days in the first 28 days, major adverse kidney events at Day 90 and dialysis dependency at one year. The study will also include subgroup analyses to explore the effectiveness of SCD therapy in AKI patients with sepsis and acute respiratory distress syndrome.

About the NEUTRALIZE-AKI Interim Analysis

The NEUTRALIZE-AKI pivotal clinical trial protocol specifies that an interim analysis will be conducted by the independent DSMB on the primary endpoint of the trial when approximately 50% of patients (100 patients) achieve 90-day follow-up. The protocol specifies a very low probability of stopping the trial for efficacy at the interim analysis and would also require concurrence by the FDA. It also specifies that the DSMB may recommend a sample size re-estimation to maintain a statistically significant CRRT plus SCD therapy effect by the end of the study, based on the interim results. And while SeaStar Medical believes it is unlikely, the DSMB could also recommend stopping the trial for futility.

About Acute Kidney Injury (AKI) and Hyperinflammation

AKI is characterized by a sudden and temporary loss of kidney function and can be caused by a variety of conditions such as COVID-19, sepsis, severe trauma and surgery. AKI can cause hyperinflammation, which is the overproduction or overactivity of inflammatory effector cells and other molecules that can be toxic. Damage resulting from hyperinflammation in AKI can progress to other organs, such as the heart or liver, and potentially to multi-organ dysfunction or even failure that could result in worse outcomes, including increased risk of death. Even after resolution, these patients may face chronic kidney disease or end-stage renal disease requiring dialysis, among other complications. Hyperinflammation may also contribute to added healthcare costs, such as prolonged ICU stays and increased reliance on dialysis and mechanical ventilation.

About the FDA’s Breakthrough Device Designation

SeaStar Medical’s SCD therapy has been granted Breakthrough Device Designation for six indications, including the treatment of adult AKI requiring CRRT. FDA grants Breakthrough Device Designation when a device provides for more effective treatment or diagnosis of life-threatening or irreversibly debilitating human disease or conditions. It must also represent one or more of the following: a) a breakthrough technology, b) a therapeutic treatment where no approved or cleared alternatives exist, c) offer significant advantages over existing approved or cleared alternative, and/or d) the device availability is in the best interest of patients. The Breakthrough Device Designation is designed to provide timely access to medical devices to speed up development, assessment, and review for FDA approval.

About the SeaStar Medical Selective Cytopheretic Device Therapy

The Selective Cytopheretic Device (SCD) therapy is designed as a disease-modifying device that neutralizes over-active immune cells and stops the cytokine storm that yields destructive hyperinflammation and creates a cascade of events that wreak havoc in the patient’s body. The SCD therapy has broad applications in multiple acute and chronic kidney and cardiovascular diseases, representing nearly a million patients who today have no FDA-approved options for treating their disease. Unlike pathogen removal and other blood-purification tools, the SCD therapy is integrated with an existing CRRT hemofiltration system to selectively target and transition proinflammatory monocytes to a reparative state and promote activated neutrophils to be less inflammatory. This unique immunomodulation approach may promote long-term organ recovery, eliminate the need for future RRT, including dialysis, and prevent loss of life.

About SeaStar Medical

SeaStar Medical is a commercial-stage healthcare company focused on transforming treatments for critically ill patients facing organ failure and potential loss of life. SeaStar’s first commercial product, QUELIMMUNE (SCD-PED), was approved in 2024 by the U.S. Food and Drug Administration (FDA). It is the only FDA approved product for the ultra-rare condition of life-threatening acute kidney injury (AKI) due to sepsis or a septic condition in critically ill pediatric patients. SeaStar’s Selective Cytopheretic Device (SCD) therapy has been awarded Breakthrough Device Designation for six therapeutic indications by the FDA, enabling the potential for a speedier pathway to approval and preferable reimbursement dynamics at commercial launch. The company is currently conducting a pivotal trial of its SCD therapy in adult patients with AKI requiring continuous renal replacement therapy, a life-threatening condition with no effective treatment options that impacts over 200,000 adults in the U.S. annually.

For more information visit www.seastarmedical.com or visit us on LinkedIn or X .

Forward-Looking Statements

This press release contains certain forward-looking statements within the meaning of the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1955. These forward-looking statements include, without limitation, SeaStar Medical’s expectations with respect to anticipated patient benefits from our products; the expected regulatory approval process and timeline for our products; the anticipated timing of results from clinical trials; and the ability of SeaStar Medical to meet the expected timeline. Words such as “believe,” “project,” “expect,” “anticipate,” “estimate,” “intend,” “strategy,” “future,” “opportunity,” “plan,” “may,” “should,” “will,” “would,” “will be,” “will continue,” “will likely result,” and similar expressions are intended to identify such forward-looking statements. Forward-looking statements are predictions, projections and other statements about future events that are based on current expectations and assumptions and, as a result, are subject to significant risks and uncertainties that could cause the actual results to differ materially from the expected results. Most of these factors are outside SeaStar Medical’s control and are difficult to predict. Factors that may cause actual future events to differ materially from the expected results include, but are not limited to: (i) the risk that SeaStar Medical may not be able to obtain regulatory approval of its SCD product candidates; (ii) the risk that SeaStar Medical may not be able to raise sufficient capital to fund its operations, including current or future clinical trials; (iii) the risk that SeaStar Medical and its current and future collaborators are unable to successfully develop and commercialize its products or services, or experience significant delays in doing so, including failure to achieve approval of its products by applicable federal and state regulators, (iv) the risk that SeaStar Medical may never achieve or sustain profitability; (v) the risk that SeaStar Medical may not be able to secure additional financing on acceptable terms; (vi) the risk that third-party suppliers and manufacturers are not able to fully and timely meet their obligations, (vii) the risk of product liability or regulatory lawsuits or proceedings relating to SeaStar Medical’s products and services, (viii) the risk that SeaStar Medical is unable to secure or protect its intellectual property, and (ix) other risks and uncertainties indicated from time to time in SeaStar Medical’s Annual Report on Form 10-K, including those under the “Risk Factors” section therein and in SeaStar Medical’s other filings with the SEC. The foregoing list of factors is not exhaustive. Forward-looking statements speak only as of the date they are made. Readers are cautioned not to put undue reliance on forward-looking statements, and SeaStar Medical assumes no obligation and do not intend to update or revise these forward-looking statements, whether as a result of new information, future events, or otherwise.

For more information visit www.seastarmedical.com or visit us on LinkedIn or X .

Contact:
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