Recent Advances in the Diagnosis and Treatment of Cardiovascular Diseases in Small Animals

A special issue of Veterinary Sciences (ISSN 2306-7381). This special issue belongs to the section "Veterinary Internal Medicine".

Deadline for manuscript submissions: 30 July 2026 | Viewed by 2599

Special Issue Editors


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Guest Editor
Department of Internal Medicine, The Faculty of Veterinary Medicine, Bursa Uludag University, Bursa 16059, Türkiye
Interests: valvular heart diseases; cardiomyopathies; proteomics; speckle tracking echocardiography; veterinary cardiology

Special Issue Information

Dear Colleagues,

Cardiovascular diseases remain a major cause of morbidity and mortality in small animals and represent a rapidly evolving field within veterinary internal medicine. Over the past decade, significant progress has been made in advanced diagnostic imaging, biomarker discovery, and the development of novel therapeutic strategies for feline and canine cardiomyopathies, congenital heart diseases, arrhythmias, and acquired myocardial disorders. These advances mirror similar developments in human cardiology, highlighting the translational relevance of small-animal models and emphasizing the potential for cross-disciplinary collaboration.

Despite the availability of traditional diagnostic techniques, such as 2D echocardiography, M-mode, Doppler assessments, and tissue Doppler imaging, emerging technologies are transforming clinical decision-making processes. Techniques such as speckle tracking echocardiography, three-dimensional and four-dimensional echocardiography, assessment of interventricular pressure gradients, myocardial work indices, and machine learning-assisted image analysis offer unprecedented insight into myocardial mechanics. Together, these tools improve the early detection of disease, risk stratification, and monitoring of therapeutic response in dogs and cats.

Alongside diagnostic innovation, therapeutic strategies have expanded to include novel cardioprotective drugs, targeted antifibrotic agents, metabolic modulators, mitochondrial therapies, and advanced supplements aimed at improving myocardial function. Precision medicine approaches that incorporate genomic markers, neurohormonal profiling, and individualized treatment algorithms are becoming increasingly relevant in veterinary cardiology.

This Special Issue, titled “Recent Advances in the Diagnosis and Treatment of Cardiovascular Diseases in Small Animals”, aims to showcase high-impact research reflecting the current state of and future directions in small-animal cardiology. We invite submissions exploring advanced imaging techniques, innovative therapeutics, translational cardiology, artificial intelligence applications, interventional cardiology, and pathophysiological insights. By facilitating knowledge exchange among clinicians, researchers, and interdisciplinary teams, we hope that this issue will encourage ongoing growth and collaboration within the field.

Prof. Dr. Ryou Tanaka
Prof. Dr. Zeki Yilmaz
Guest Editors

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Keywords

  • advanced echocardiography
  • speckle tracking echocardiography
  • tissue tracking echocardiography
  • 3D/4D echocardiography
  • interventricular pressure gradients
  • myocardial work indices
  • tissue Doppler imaging
  • cardiomyopathy
  • feline HCM
  • canine MMVD
  • pulmonary hypertension
  • restrictive cardiomyopathy (RCM)
  • arrhythmogenic cardiomyopathy (ARVC)
  • biomarkers
  • cardiac troponins
  • NT-proBNP
  • precision cardiology
  • novel therapeutics
  • cardioprotective agents
  • thromboembolism prophylaxis
  • mitochondrial therapies
  • machine learning
  • artificial intelligence
  • interventional cardiology
  • heart failure
  • small-animal cardiology
  • dogs
  • cats

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Published Papers (3 papers)

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Research

17 pages, 1701 KB  
Article
Left Atrioventricular Coupling Index in Feline Hypertrophic Cardiomyopathy: Association with Disease Severity and Arterial Thromboembolism
by Tuğba Varlik, Didem Algan, Ryou Tanaka and Zeki Yilmaz
Vet. Sci. 2026, 13(5), 491; https://doi.org/10.3390/vetsci13050491 - 19 May 2026
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Abstract
HCM is the most prevalent cardiac disease in cats and is associated with substantial morbidity and mortality. Among its complications, FATE represents a major adverse clinical outcome. Conventional echocardiographic indices typically assess atrial or ventricular parameters separately and may not fully capture the [...] Read more.
HCM is the most prevalent cardiac disease in cats and is associated with substantial morbidity and mortality. Among its complications, FATE represents a major adverse clinical outcome. Conventional echocardiographic indices typically assess atrial or ventricular parameters separately and may not fully capture the structural relationship between the LA and LV. The left atrioventricular coupling index (LACI) is a volumetric ratio that combines LA remodeling and LV chamber size at end-diastole into a single structural index. This retrospective, cross-sectional observational study included 91 cats, classified according to ACVIM guidelines into healthy controls (n = 33), asymptomatic HCM (stage B1, n = 14; stage B2, n = 16), symptomatic HCM (stage C, n = 15), and cats with FATE (n = 13). Conventional and two-dimensional speckle-tracking echocardiography were performed, and LACI-ED was calculated as the ratio of LA end-diastolic volume to LV end-diastolic volume. LACI-ED increased progressively with disease severity (p < 0.001), showing the highest values in symptomatic HCM and FATE cases. It correlated positively with LA size and volume (p < 0.01) and inversely with LV GLS (p < 0.01). Exploratory ROC analysis for FATE status yielded limited discriminatory performance for LACI-ED > 150% (AUC = 0.575; 95% CI: 0.402–0.736; sensitivity 46.2%; specificity 84.4%). Although LACI-ED > 150% was associated with higher odds of prevalent FATE (OR = 4.65; 95% CI: 1.405–29.215; p = 0.020), this finding should be interpreted with caution. Pairwise comparisons of ROC curve areas between LACI-ED and conventional echocardiographic parameters (LA/Ao ratio, LA diameter, and LV GLS) revealed no statistically significant differences (all p > 0.05). Although LACI-ED > 150% was associated with higher odds of prevalent FATE (OR = 6.8; p < 0.05), this finding should be interpreted with caution. This cross-sectional study evaluates associations with disease stage and thromboembolic status at the time of examination. The findings suggest that LACI-ED reflects disease severity in feline HCM, whereas its utility for thromboembolic risk assessment appears limited. Full article
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11 pages, 2071 KB  
Article
Left Atrioventricular Coupling Index: An Echocardiographic Index of Atrioventricular Dysfunction in Dogs with Myxomatous Mitral Valve Disease
by Federica Valeri, Francesco Porciello, Mark Rishniw, Simone Cupido, Maria Cicogna, Andrea Corda and Domenico Caivano
Vet. Sci. 2026, 13(2), 201; https://doi.org/10.3390/vetsci13020201 - 20 Feb 2026
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Abstract
The close physiological relationship between the left atrium (LA) and left ventricle (LV) suggests that an index assessing both the cardiac chambers simultaneously could provide useful information about disease severity. Consequently, investigators have proposed the atrioventricular coupling index (LACi) and demonstrated its utility [...] Read more.
The close physiological relationship between the left atrium (LA) and left ventricle (LV) suggests that an index assessing both the cardiac chambers simultaneously could provide useful information about disease severity. Consequently, investigators have proposed the atrioventricular coupling index (LACi) and demonstrated its utility in predicting the likelihood of atrial fibrillation, heart failure, and other cardiovascular events in humans. No studies have been reported in veterinary medicine. Therefore, we measured the LACi in healthy dogs and dogs affected by myxomatous mitral valve disease (MMVD). Two hundred and thirty-three dogs (105 healthy dogs and 128 dogs with MMVD) were retrospectively included in the study. The LACi (LA volume/LV volume × 100) at LV end-diastole (LACi-ED) and LV end-systole (LACi-ES) of each dog was measured using a monoplane Simpson’s Method of Discs from the left apical four-chamber view. In healthy dogs, LACi-ED and LACi-ES showed no relationship with bodyweight, heart rate and age (R2 < 0.03, for all variables). In MMVD dogs, LACi-ED and LACi-ES differed between ACVIM stages (p < 0.001 and p < 0.02, for all stages). The LACi-ED and LACi-ES had similar accuracy in identifying MMVD dogs with congestive heart failure (area under the curve of 0.920 and 0.906, respectively). Our data suggest that the LACi can be useful in assessing left atrioventricular function in dogs with MMVD but the diagnostic accuracy in identifying dogs with congestive heart failure was not superior to the left atrial-to-aortic ratio. Prospective studies are needed to evaluate the predictive value of this new echocardiographic index in dogs affected by MMVD. Full article
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15 pages, 1732 KB  
Article
Computed Tomography Assessment of the Bronchial Lumen–Vertebral Body and Pulmonary Artery–Vertebral Body Relationships in Cats Naturally Infected with Immature Dirofilaria immitis
by Sara Nieves García-Rodríguez, Jorge Isidoro Matos, Laín García-Guasch, Eva Mohr-Peraza, José Alberto Montoya-Alonso and Elena Carretón
Vet. Sci. 2026, 13(2), 186; https://doi.org/10.3390/vetsci13020186 - 13 Feb 2026
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Abstract
Feline heartworm disease, caused by Dirofilaria immitis, is often underdiagnosed, particularly during its larval stage, known as Heartworm-Associated Respiratory Disease, (HARD). This study aimed to quantify CT-detectable pulmonary changes in naturally infected cats. Computed tomography (CT) was performed in 38 cats: Group [...] Read more.
Feline heartworm disease, caused by Dirofilaria immitis, is often underdiagnosed, particularly during its larval stage, known as Heartworm-Associated Respiratory Disease, (HARD). This study aimed to quantify CT-detectable pulmonary changes in naturally infected cats. Computed tomography (CT) was performed in 38 cats: Group A (n = 30, symptomatic seropositive) and Group B (n = 8, asymptomatic seronegative). Bronchial and pulmonary artery diameters were indexed to the sixth thoracic vertebral body (T6) to calculate bronchial-to-vertebral body (B/VB) and pulmonary artery-to-vertebral body (A/VB) ratios across all lung lobes. Group A cats showed significantly higher B/VB ratios in the left cranial and right middle lobes compared with Group B (p < 0.05), with increases of 42.0% and 47.5%, respectively. Conversely, A/VB ratios did not differ significantly between groups (p > 0.05), indicating the absence of relevant vascular remodelling. Intra-operator and inter-observer reliability were excellent (intraclass correlation coefficients > 0.85). These findings suggest that bronchial dilation in the absence of arterial enlargement represents a key tomographic feature of larval D. immitis infection. Quantitative CT ratios, particularly the B/VB ratio, provide objective imaging markers for the diagnosis of HARD in clinical practice, and may assist in differentiating this condition from other feline respiratory diseases in endemic areas. Full article
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