Cardio-Reno-Cardiac Syndrome, Classification, Pathophysiology and Clinical Implications: Review—Part 6

Q: What is the clinical evidence from this study?

Study design: Review. Population: Cardio-reno-cardiac syndrome (Type 5 and proposed Type 6 cardiorenal syndrome). Intervention: Systemic conditions (e.g., sepsis, cirrhosis, diabetes, hypertension, Fabry disease, amyloidosis).

Q: What does this research mean for the field?

Cardio-reno-cardiac syndrome is driven by systemic conditions such as diabetes, hypertension, and cirrhosis that cause concurrent or reciprocal dysfunction of both the heart and kidneys. Novelty: ClaimNovelty.SYNTHESIS. Consensus alignment: ConsensusAlignment.NEUTRAL.

Elmukhtar M. Habas; Amnna Rayani; Ala M Habas; Kaled Alarabi; Eshrak Habas; Mohamed Abdunasser M. Baghi; Aml Habas; Mehdi Errayes

doi:10.63475/yjm.v5i2.0433

January 1, 2026Yemen Journal of MedicineOpen Access

Cardio-Reno-Cardiac Syndrome, Classification, Pathophysiology and Clinical Implications: Review—Part 6

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Key result

Secondary cardiorenal syndromes stem from acute systemic insults or chronic illnesses driving dual organ failure.

Why the study?

Type 5 cardio-renal syndrome is caused by diverse systemic diseases that lead to acute and chronic dysfunction of both the heart and kidneys, requiring a comprehensive synthesis of its pathophysiology, risk factors, and management incorporating recent advances.

Key Points

To review the classification, pathophysiological mechanisms, risk factors, and clinical management strategies associated with type 5 cardio-renal syndrome (cardio-reno-cardiac syndrome).
Narrative review synthesizing current literature and recent advances regarding type 5 cardio-renal syndrome.
Evaluation of systemic diseases that simultaneously trigger acute and chronic cardiac and renal dysfunction.
Systemic disorders simultaneously provoke acute or chronic damage in both cardiac and renal tissues, where impairment in one organ further accelerates dysfunction in the other.
Primary systemic drivers include systemic lupus erythematosus, hypertension, diabetes mellitus, and hepatic cirrhosis.
Effective clinical management requires concurrently addressing bidirectional organ crosstalk and the inciting systemic disease process.

Structured PICO

P

Population

Patients with Type 5 cardio-renal syndrome (cardio-reno-cardiac syndrome, CRCS), a secondary cardiorenal syndrome caused by acute or chronic systemic conditions (such as sepsis, systemic lupus erythematosus, diabetes mellitus, hypertension, amyloidosis, or hepatic cirrhosis) resulting in simultaneous or bidirectional cardiac and renal dysfunction.

This narrative review details the pathophysiology, classification (including acute Type 5 and proposed chronic Type 6 subtypes), and organ cross-talk mechanisms of secondary cardio-reno-cardiac syndrome to facilitate earlier recognition and targeted management of the underlying systemic triggers.

Limitations

Comprehensive epidemiological data for cardio-reno-cardiac syndrome are inadequate and incomplete.
The proposed Type 6 chronic secondary cardiorenal syndrome classification is an emerging construct not yet ratified by international consensus.
Temporal staging of acute cardio-reno-cardiac syndrome (hyperacute, acute, subacute, chronic) has not been formally validated in dedicated cohorts.
Information regarding autonomic nervous system alterations in kidney function during sepsis is mostly restricted to animal research.
Studies on COVID-19-associated cardiorenal syndrome were predominantly observational with varied definitions and substantial selection bias.
Comprehensive epidemiological data for cardio-reno-cardiac syndrome (CRCS) are inadequate and incomplete.
The proposed six-type CRS classification (separating acute Type 5 and chronic Type 6) is an emerging construct not yet ratified by international consensus.
The temporal staging classification for acute CRCS (hyperacute, acute, subacute, chronic) is a conceptual adaptation from sepsis and AKI literature and has not been formally validated in dedicated CRCS cohorts.
Evidence regarding COVID-19-associated CRCS carries methodological limitations, including varied CRS definitions across cohorts and substantial selection bias in pandemic-era populations.

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Implication

May support integrated management of systemic drivers in type 5 CRS; leaves open prospective validation of proposed type 6 classification.

Abstract

Type 5 cardio-renal syndrome (CRS), cardio-reno-cardiac syndrome (CRCS), is a condition secondary to systemic diseases that usually leads to acute or chronic dysfunction of the heart or kidney, which causes dysfunction of the other organ. Different pathophysiological mechanisms and factors affecting CRCS development, such as systemic lupus, hypertension, and diabetes, lead to acute and chronic damage to the heart and kidneys at the same time. Furthermore, other diseases such as hepatic cirrhosis can cause kidney failure and inapparent or apparent heart dysfunction, precipitating CRCS. In this part of the CRS review series, pathophysiology, risk factors, and management of CRCS are comprehensively reviewed, incorporating the latest evidence and recent advances in the field.

Discussion

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Cite This Study

Habas et al. (2026) conducted a review in Cardio-reno-cardiac syndrome (Type 5 and proposed Type 6 cardiorenal syndrome). Systemic conditions (e.g., sepsis, cirrhosis, diabetes, hypertension, Fabry disease, amyloidosis) was evaluated. Cardio-reno-cardiac syndrome (secondary CRS) arises from acute systemic insults like sepsis (Type 5) or chronic illnesses like cirrhosis and diabetes (proposed Type 6) causing dual organ failure.

synapsesocial.com/papers/6af36663f6a89bd804807fa7 https://doi.org/10.63475/yjm.v5i2.0433

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Cardio-Reno-Cardiac Syndrome, Classification, Pathophysiology and Clinical Implications: Review—Part 6

Key Points

Structured PICO

Limitations

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

Cardio-Reno-Cardiac Syndrome, Classification, Pathophysiology and Clinical Implications: Review—Part 6

Key Points

Structured PICO

Limitations

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

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