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Dong J, Jiang XM, Xie DJ, Luo J, Ran H, Li L, Li M, Jiang P, Zhang PY, Zhou L. Establishment of a canine model of pulmonary arterial hypertension induced by dehydromonocrotaline and ultrasonographic study of right ventricular remodeling. Clin Exp Hypertens 2023; 45:2190503. [PMID: 36924239 DOI: 10.1080/10641963.2023.2190503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/18/2023]
Abstract
OBJECTIVE Pulmonary arterial hypertension (PAH) means high blood pressure in the lungs. We aimed to observe the right ventricular size, wall thickness and characteristic functional changes and their associations with PAH in an established model of beagle dogs, and to explore convenient, reliable and sensitive ultrasound indicators for assessing right ventricular remodeling. METHODS Twenty healthy beagle dogs (8-10 kg) were randomly divided into control group (N-dimethylformamide, n = 10) and dehydromonocrotaline (DHMCT) group (DHMCT, n = 10). N-dimethylformamide or DHMCT was injected through a catheter into the right atrium, and then right heart catheterization, routine echocardiography and two-dimensional speckle tracking imaging (2D-STI) were performed before modeling (0 weeks) and 8, 14 weeks after modeling. Hemodynamic parameters and right ventricular function-related ultrasound data were acquired. At the end of the experiment, the animals were killed and the lung tissues were taken for HE staining. Left and right ventricular walls were separated and weighed respectively, and right ventricular hypertrophy index (RVHI) was measured. The associations of the routine ultrasound data and 2D-STI data at each time point with hemodynamic parameters and RVHI were analyzed. RESULTS At 0, 8 and 14 weeks, gradual decreases in the right ventricular global longitudinal strain (RVLS) were found in DHMCT group. RVH occurred in DHMCT group, and DHMCT group had a significantly higher RVHI than that of control group (49.83 ± 4.83% vs. 39.80 ± 1.40%, P < .001) and larger pulmonary artery media thickness. RVLS had significant positive correlations with RVSP (r = 0.74, P < .001), mRVP (r = 0.72, P < .001), PASP (r = 0.75, P < .001), mPAP (r = 0.72, P < .001) and PVR (r = 0.68, P < .001). There was a significant positive correlation between RVLS and RVHI (r = 0.74, P < .001). CONCLUSION The right ventricular function in PAH can be effectively assessed by echocardiography, and RVLS measured by 2D-STI sensitively reflects right ventricular remodeling following PAH.
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Affiliation(s)
- Jing Dong
- Department of Cardiovascular Ultrasound, Nanjing First Hospital, Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Xiao-Min Jiang
- Department of Cardiology, Nanjing First Hospital, Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Du-Jiang Xie
- Department of Cardiology, Nanjing First Hospital, Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Jie Luo
- Department of Cardiology, Nanjing First Hospital, Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Hong Ran
- Department of Cardiovascular Ultrasound, Nanjing First Hospital, Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Lin Li
- Department of Cardiovascular Ultrasound, Nanjing First Hospital, Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Miao Li
- Department of Cardiovascular Ultrasound, Nanjing First Hospital, Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Pei Jiang
- Department of Cardiovascular Ultrasound, Nanjing First Hospital, Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Ping-Yang Zhang
- Department of Cardiovascular Ultrasound, Nanjing First Hospital, Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Ling Zhou
- Department of Cardiology, Nanjing First Hospital, Nanjing Medical University, Nanjing, Jiangsu Province, China
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Ivonin AG, Smirnova SL, Roshchevskaya IM. Body Surface Potential Mapping during Ventricular Depolarization in Rats after Acute Exhaustive Exercise. Arq Bras Cardiol 2022; 119:S0066-782X2022005014203. [PMID: 36102423 PMCID: PMC9750213 DOI: 10.36660/abc.20211058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 04/03/2022] [Accepted: 06/01/2022] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Exhaustive physical exercise can cause substantial changes in the electrical properties of the myocardium. OBJECTIVE To evaluate, using body surface potential mapping, the electrical activity of the heart in rats during ventricular depolarization after acute exhaustive exercise. METHODS Twelve-week-old male rats were submitted to acute treadmill exercise at 36 m/min until exhaustion. Unipolar electrocardiograms (ECGs) from the torso surface were recorded in zoletil-anesthetized rats three to five days before (Pre-Ex), 5 and 10 minutes after exhaustive exercise (Post-Ex 5 and Post-Ex 10, respectively) simultaneously with ECGs in limb leads. The instantaneous body surface potential maps (BSPMs) were analyzed during ventricular depolarization. P values <0.05 were considered statistically significant. RESULTS Compared with Pre-Ex, an early completion of the second inversion of potential distributions, an early completion of ventricular depolarization, as well as a decrease in the duration of the middle phase and the total duration of ventricular depolarization on BSPMs were revealed at Post-Ex 5. Also, compared with Pre-Ex, an increase in the amplitude of negative BSPM extremum at the R-wave peak on the ECG in lead II (RII-peak) and a decrease in the amplitude of negative BSPM extremum at 3 and 4 ms after RII-peak were showed at Post-Ex 5. At Post-Ex 10, parameters of BSPMs did not differ from those at Pre-Ex. CONCLUSION In rats, acute exhaustive exercise causes reversible changes in the temporal and amplitude characteristics of BSPMs during ventricular depolarization, most likely related to alterations in the excitation of the main mass of the ventricular myocardium.
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Affiliation(s)
- Alexey G. Ivonin
- Department of Comparative CardiologyKomi Scientific Centre of the Ural BranchRussian Academy of SciencesSyktyvkarFederação Russa Department of Comparative Cardiology – Komi Scientific Centre of the Ural Branch of the Russian Academy of Sciences , Syktyvkar – Federação Russa
| | - Svetlana L. Smirnova
- Department of Comparative CardiologyKomi Scientific Centre of the Ural BranchRussian Academy of SciencesSyktyvkarFederação Russa Department of Comparative Cardiology – Komi Scientific Centre of the Ural Branch of the Russian Academy of Sciences , Syktyvkar – Federação Russa
| | - Irina M. Roshchevskaya
- Department of Comparative CardiologyKomi Scientific Centre of the Ural BranchRussian Academy of SciencesSyktyvkarFederação Russa Department of Comparative Cardiology – Komi Scientific Centre of the Ural Branch of the Russian Academy of Sciences , Syktyvkar – Federação Russa
- Laboratory of Pharmacological ScreeningResearch Zakusov Institute of PharmacologyMoscowFederação Russa Laboratory of Pharmacological Screening – Research Zakusov Institute of Pharmacology , Moscow – Federação Russa
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