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1

A paradigm for quantifying ventricular contraction

100%

Palladino J. L., Noordergraaf A.

Cellular and Molecular Biology Letters

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2002

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tom 07

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nr 2

The left ventricle may be described as a time, volume and flow dependent pressure generator. First, isovolumic pressure is measured at various end-diastolic volumes. Next, pressure is adjusted to account for small changes accompanying ejection, denoted the ejection effect. The resulting analytical function can describe pressure generation and ventricular outflow of the ventricle under a wide range of contractile and vascular conditions. This paradigm is unique in separating isovolumic from ejecting ventricular properties, as well as ventricular from vascular conditions.

2

Signal-averaged P-wave ECG as a marker of atrial electrical instability in patients with right ventricular dysfunction

84%

Schueller P. O., Steiner S., Enayat M., Schannwell C. M., Hennersdorf M., Strauer B. E.

Journal of Physiology and Pharmacology. Supplement

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2007

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tom 58

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nr 5

3

M-Mode echocardiographic examinations in show-jumping and Arabian race horses

84%

Meral Y., Cakiroglu D., Sancak A. A., Karabacak A.

Medycyna Weterynaryjna

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2007

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tom 63

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nr 01

56-58

In this study, show-jumping horses (n = 80) and Arabian race horses (n = 80) from different work groups were examined, with the guidance of 2-D, by M-Mode echocardiography, to establish the reference values and to determine the differences in the cardiac structural measurements. Measurements were performed in four different planes by obtaining M-Mode cross-sections from M. papillaris, C. tendinei, mitral valves and aorta root levels, with the guidance of 2-D in the 4th intercostal space. Left ventricle, right ventricle, left atrium, aorta root, interventriculer septum, left ventricle posterior wall and heart wall movements were observed and end-systolic and end-diastolic diameters with left ventricle function evaluations were performed. Subsequently, all of these values were compared between the two groups. The results indicated statistical significance of P < 0.001 in end-diastolic volume (EDV) and ejection fraction (EF), and P < 0.005 in diastolic left ventricle internal diameter (LVIDd), diastolic interventricular septum thickness (IVSd), diastolic right ventricle internal diameter (RVd), diastolic aorta internal diameter (Aod), fractional shortening (FS) and cardiac output (CO). It has been concluded that Arabian race horses are more advantageous with their powerful left ventricle functions, while show-jumping horses have the benefit of possessing wider left ventricles, indicating the probability that exercise improves the left ventricle functions in horses.

4

Effect of in ovo injection of acetylsalicylic acid on morphotic parameters and heart work in chicken embryos exposed to hyperthermia

67%

Pawlak K., Lis M., Sechman A., Tombarkiewicz B., Niedziolka J.

Bulletin of the Veterinary Institute in Puławy

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2011

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tom 55

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nr 1

The objective of the experiment was to define if in ovo injection of acetylsalicylic acid (ASA) during the final stage of embryogenesis has an effect on morphotic parameters and heart work of chicken embryos subjected to hyperthermia. Eggs (n=420) from a broiler breeder flock were incubated under standard conditions. On the 18th d of incubation, they were injected with 5 mg of ASA/50 µl of 0.9% NaCI and subsequently incubated during the hatching period under control (T=37.2°C) and hyperthermic (T=38.5°C) conditions. The cardiac function in the embryos was measured every day at the same time using contactless ballistocardiography. After hatching, the hearts were collected from randomly selected embryos or one-day old chicks to determine heart weight, relative heart weight, and ventricle wall thickness. It was shown that hyperthermia during the final stage of embryogenesis accelerated heart rate, inhibited its development, and reduced chicken hatchability. The injection of ASA on the 18th d of incubation in the group of embryos exposed to hyperthermia caused the heart rate to decrease to near optimum values. The administration of ASA also limited a decrease in heart weight and ventricle wall thickness, and improved chicken hatchability.

5

Electrocardiographic examination of heart function in rats exposed to hallucinogens from Psilocybe mushrooms

67%

Borowiak K. S., Machoy-Mokrzynska A., Domanski L., Majdanik S., Dutkiewicz G., Safranow K., Janus T., Mikolajek V.

Acta Toxicologica

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2003

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tom 11