الفهرس 
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Abstract
Bronchial asthma is a chronic inflammatory disorder of the airways, characterized by an obstruction of airflow
The rise in negative pressure during inspiration and positive pressure during expiration which exceeds the normal right ventricular preload and after load cycle may cause an increase in intrathoracic pressure.
Strain is a measure of tissue deformation and is defined as the change in length normalized to the original length. The rate at which this change occurs is called strain rate. Deformation in a one dimensional object, such as a thin bar, is limited to lengthening or shortening. (81)
Strain and strain rate values have been studied in a number of conditions affecting the right heart, including arrhythmogenic RV dysplasia, (85) pulmonary embolism,(86) pulmonary hypertension,(87) systemic right ventricle,(88) and amyloidosis. (89-91)
The aim of this work was to assess right ventricular functions in patients with bronchial asthma using tissue Doppler strain rate measurement. Correlate it with the severity of asthma attacks.
The present study was conducted at Alexandria main university hospital, Cardiology and chest departments.
The subjects were divided into two groups:
1) Group I: This group included fifteen Patients with bronchial asthma.
2) Group II: This group included age and sex matched fifteen non asthmatic healthy subjects as control group.
All subjects were subjected to:
1) Informed consent will be obtained.
2) Complete clinical examination.
3) Echocardiography
4) Group I were subjected to:
5) Plain-X-ray chest and heart (P-A) .
6) Resting electrocardiography (E.C.G) standard twelve lead E.C.G.
7) Arterial blood gases.
8) Spirometry (FEV1, FEV1% of predicted value)
In the current study, TDI of right ventricle diastolic function showed that asthmatic patients had an impaired relaxation pattern of the right ventricle and a consequently impaired right ventricular diastolic function.
In this study we found that there were statistically significant differences between the bronchial asthma group and the control group regarding the pulse (84.47 ± 9.68 bpm and 77.07 ± 6.76 bpm, respectively, p-value <0.05)
In this study we found that there were statistically signific