QTc Prolongation in Acute Hemorrhagic Stroke — The Overlooked Cardiac Footprint of a Neurological Catastrophe

Abstract

The interface between the brain and the heart has long fascinated clinicians and researchers alike. The intricate bidirectional relationship between neurological injury and cardiac electrophysiology forms the basis of the so-called “stroke–heart syndrome,” in which acute cerebrovascular events precipitate transient or sustained cardiac dysfunction. The study by Ullah and Khurshid published in this issue of the Pakistan Heart Journal—“Frequency of QTc Prolongation in Hospitalized Patients with Acute Hemorrhagic Stroke”—adds valuable data to this evolving field by highlighting the burden of QTc prolongation in a cohort of Pakistani patients with intracerebral hemorrhage [1]. QTc Prolongation — An Underappreciated Marker: The QT interval, measured from the onset of ventricular depolarization to the end of repolarization, represents a sensitive indicator of cardiac electrical stability. Its corrected form (QTc) adjusts for heart rate variability, with Bazett’s formula remaining the most commonly applied method despite known limitations. A prolonged QTc reflects delayed ventricular repolarization, which predisposes to polymorphic ventricular tachycardia, torsades de pointes, and sudden cardiac death [2]. In the context of acute stroke—particularly hemorrhagic stroke—QTc prolongation may not only indicate underlying autonomic dysregulation but also serve as a harbinger of adverse outcomes. Despite this, cardiac monitoring is often overlooked in the acute neurocritical care setting, especially in resource-limited environments [3,4]. The current study brings this neglected dimension of stroke care into sharp focus. Key Findings and Clinical Implications: Among 87 patients with acute hemorrhagic stroke, Ullah and Khurshid observed QTc prolongation in nearly half (47.1%)—a strikingly high prevalence [1]. This figure exceeds that reported by Anum et al. (34.1%) in a similar Pakistani population, suggesting regional or methodological differences, or perhaps a more severe spectrum of illness in the present cohort. The lack of significant association between QTc prolongation and age or gender mirrors findings from other studies, indicating that the phenomenon may be more related to stroke severity and autonomic disturbance than to demographic variables [5]. The authors rightly emphasize the clinical implications of QTc prolongation: it is not a benign incidental finding. Stroke patients with prolonged QTc are more prone to malignant arrhythmias, particularly in the setting of concurrent electrolyte imbalance, neurogenic pulmonary edema, or catecholamine surge. Recognition of these ECG changes should therefore prompt early cardiac surveillance and correction of reversible factors [6]. Continuous ECG monitoring, judicious use of medications known to prolong QT interval, and early cardiology consultation form the cornerstone of preventive strategy. Unfortunately, such integrated care remains uncommon in many hospitals where neurology and cardiology services operate in silos [7]. Mechanistic Insights — The Brain–Heart Axis: The pathophysiology underlying QTc prolongation in hemorrhagic stroke is complex and multifactorial. The central autonomic network—comprising the insular cortex, hypothalamus, and brainstem nuclei—regulates cardiac function via sympathetic and parasympathetic outflows. Acute cerebral injury, particularly involving the right insula or thalamus, triggers excessive sympathetic activation, leading to catecholamine-mediated myocardial injury, myocardial stunning, and repolarization abnormalities [8]. This autonomic storm not only prolongs the QT interval but also contributes to the spectrum of neurogenic cardiac injury—ranging from transient left ventricular dysfunction (“Takotsubo-like cardiomyopathy”) to fatal arrhythmias. Recognition of this connection underscores the importance of a multidisciplinary “neurocardiac” approach in acute stroke management [8-10]. Strengths and Limitations: The present study stands out for addressing a clinically meaningful yet under-researched topic in South Asia. The inclusion of well-defined exclusion criteria—such as eliminating patients with prior cardiac disease or drugs affecting QT interval—strengthens the validity of its findings. The manual measurement of QT and RR intervals from lead II by a single observer reduces inter-observer variability, enhancing internal consistency. However, the study’s limitations warrant acknowledgment. The single-center design and modest sample size limit generalizability. Absence of follow-up data precludes conclusions regarding the prognostic value of QTc prolongation—whether it translates into increased arrhythmia burden, longer hospital stay, or mortality. Furthermore, the use of Bazett’s correction, while conventional, may overestimate QTc at high heart rates. Future multicenter studies employing Fridericia or Framingham formulas and incorporating serial ECGs, cardiac biomarkers, and echocardiography could yield a more nuanced understanding. Perspective and Future Directions: The findings of Ullah and Khurshid contribute to a growing recognition that stroke is not merely a neurological event but a systemic syndrome. Cardiac electrophysiological changes, including QTc prolongation, should be interpreted as integral components of stroke severity rather than incidental findings. There is a pressing need for standard protocols mandating ECG and electrolyte assessment upon admission of all stroke patients—particularly those with intracerebral hemorrhage. Integration of cardiology expertise into stroke teams can facilitate early detection and management of arrhythmias, thereby reducing preventable deaths. Moreover, in regions like Pakistan, where both stroke and cardiovascular diseases are highly prevalent, such studies hold public health significance. They underline the necessity of investing in cardiac monitoring infrastructure even in secondary-care hospitals. Educational efforts targeting physicians and nurses regarding recognition of ECG abnormalities in stroke care could yield immediate benefits. CONCLUSION The study by Ullah and Khurshid is a timely reminder that the heart often mirrors the distress of the brain. QTc prolongation in acute hemorrhagic stroke, affecting almost half of the patients, should no longer be dismissed as an epiphenomenon. Its identification mandates vigilance, correction of modifiable factors, and close collaboration between neurologists and cardiologists. Future research must move beyond prevalence to explore causality and prognostic relevance, paving the way for integrated neurocardiac care pathways. AUTHORS' CONTRIBUTION MAR: Concept and design, data acquisition, interpretation, drafting, final approval, and agree to be accountable for all aspects of the work. Acknowledgment: None. Funding: No specific grant for this research from any public, commercial, or not-for-profit funding agency References Ullah N, Khurshid R. Frequency of QTc Prolongation in Hospitalized Patients with Acute Hemorrhagic Stroke. Pak Heart J. 2025;58(04):365-369. DOI: 10.47144/phj.v58i4.2934 Wang L, Ma L, Ren C, Zhao W, Ji X, Liu Z, et al. Stroke–heart syndrome: current progress and future outlook. J Neurol. 2024;271(8):4813–25. DOI: 10.1007/s00415-024-12480-4 Soliman EZ, Howard G, Cushman M, Kissela B, Kleindorfer D, Le A, et al. Prolongation of QTc and risk of stroke: The REGARDS study. J Am Coll Cardiol. 2012;59(16):1460–7. DOI: 10.1016/j.jacc.2012.01.025 Malik S, Abdul Sattar R, Shah S, Rehman H, Tahira, Ismail MA. Frequency of QTc prolongation in patients with hemorrhagic stroke. J Ayub Med Coll Abbottabad. 2013;25(3–4):75–7. https://pubmed.ncbi.nlm.nih.gov/25226747/ Anum H, Sajjad M, Turi AH, Ahmad B, Tabassum S, Maqsood S, et al. QTc prolongation in patients of hemorrhagic stroke. Pak J Med Health Sci. 2022;16(5):923–4. DOI: 10.53350/pjmhs22165923 Birda CL, Kumar S, Bhalla A, Sharma N, Kumari S. Prevalence and prognostic significance of prolonged QTc interval in emergency patients. Int J Crit Illn Inj Sci. 2018;8(1):28–35. DOI: 10.4103/ijciis.ijciis_59_17 Birda CL, Kumar S, Bhalla A, Sharma N, Kumari S. Prevalence of electrolyte imbalance in acute stroke. Cureus. 2023;15(8):e43149. DOI: 10.7759/cureus.43149 Li M, Ramos LG. Drug-induced QT prolongation and torsades de pointes. P T. 2017;42(7):473–7. https://pubmed.ncbi.nlm.nih.gov/28674475/ Feigin VL, Forouzanfar MH, Krishnamurthi R, Mensah GA, Connor M, Bennett DA. Global burden of stroke 1990–2010. Lancet. 2014;383(9913):245–54. DOI: 10.1016/s0140-6736(13)61953-4 Zamboni L, Portoghese I, Casari R, Fusina F, Santin L, Lecca LI, et al. High-dose benzodiazepine use and QTc interval prolongation. Sci Rep. 2024;14(1):155. DOI: 10.1038/s41598-023-50489-3