No abstract available.
Stroke Volume*

No abstract available.
Stroke Volume* ; Stroke*

Pneumotachometer is the most widely used respiratory air flow sensor. But the measurement error hard to be ignored exists, since the empirical calibration carve in a closed form cannot provide accurate flow values at all measured pressure data. Any possible distortion of the calibration curve further increases measurement error, which cannot he corrected by the conventional calibration method. The present study suggests a new error correction algorithm applicable to any type of pneumotachometer equipped with computer-based data processing device. This algorithm evaluates conductance error correction coefficients at each digitized pressure level based on the cumulative pressure data obtained by manual volume syrange stroke operation at different speeds. Experiment demonstrated error minimization down to below 1/10 in mean stroke volume measurement compared to the conventional calibration curve method. The standard deviation of the stroke volume also decreased down to below 1/2 of the conventional method. The present technique can be introduced with no difficulty to the calibration procedure the American Thoracic Society, and expected to guarantee the accuracy and reliability of the respiratory air flow measurement during spirometric tests.
Calibration ; Spirometry ; Stroke ; Stroke Volume

No abstract available.
Echocardiography ; Humans ; Stroke Volume ; Stroke

No abstract available.
Doxorubicin* ; Incidence* ; Stroke Volume*

Introduction: There is no single haemodynamic parameters either static central venous pressure (CVP) or dynamic stroke volume variation, inferior vena cava distensibility index (SVV,IVCd) that can be used precisely to assess fluid responsiveness. It must be performed concurrently with clinical assessment. Therefore, this study was conducted to determine the correlation between these 3 parameters. Methods: This was a cross sectional non-interventional study conducted in intensive care unit. Each patient who fulfilled the criteria will have their CVP, SVV and IVCd measured instantaneously. Analysis of correlation was done using bivariate (Pearson) correlation, while agreement between SVV and IVCd was assessed using Cohen’s Kappa analysis. Results: A total of 37 patients were enrolled in this study. 70.3% were males and 29.7% were females. Mean age was 59.7 ± 13.3. Mean APACHE score was 24.1 ± 6.1. IVCd had significant positive correlation with SVV (r = 0.391, p = 0.017). Agreement between IVCd and SVV was 0.329 (0.95 CI = 0.0174 – 0.6412; p = 0.033). There was non-significant negative correlation between IVCd with CVP and SVV with CVP with r = -0.155 (p=0.359) and r = -0.068 (p= 0.691) respectively. Conclusion: There is only fair correlation between IVCd and SVV in determining fluid responsiveness. However, CVP does not correlate to both SVV and IVCd. Neither one of them is a good method in assessing fluid responsiveness during standard care in our centre. Therefore, the usage of above methods needs to combine with clinical parameters to yield better result.
Stroke volume variation

OBJECTIVEThe same person's pulmonary venous blood volume, left atrial volume and stroke volume were measured by lung CT scans and cardiac CT angiography (CTA). Then their relationships were analyzed in order to investigate the mechanism of breathing control.

METHODSAs we described before, full pulmonary vascular (-0.6mm) volume was accurately calculated by three-dimensional imaging technology from lung CT scan; left atrial volume and stroke volume of left ventricle were calculated from the CTA data. Then the relationships among them were analyzed for estimation of the lung-artery time.

RESULTSThe total volume of lung and pulmonary vascular blood was 3486 ± 783 (2156-4418) ml, and the pulmonary vascular blood volume was 141 ± 20 (105-163) ml. The estimated pulmonary venous volume was 71 ± 10 (52-81) ml. Left atrial volume at the end diastolic was 97 ± 39 (53-165) ml, Stroke volume of left ventricle was 86 ± 16 (60-106) ml. Pulmonary venous volume and the left atrial volume were double of stroke volume(1.7-2.4).

CONCLUSIONThe estimated lung-artery time was three heart beat.

BACKGROUND: The objective of the present study was to evaluate whether left ventricular diastolic function is altered in rheumatoid arthritis. METHODS: Thirty-six patients of rheumatoid arthritis diagnosed by 1988 revised criteria for rheumatoid arthritis and 20 cases of normal control group were matched with respect to left ventricular ejection fraction and diastolic parameters. RESULTS: Parameters of diastolic function such as peak filling rate, time to peak fillling rate and 1/3 filling rate were not significantly different between patients with rheumatoid arthritis and control groups. although time to peak filling rate was significantly prolonged in seropositive group(p<0.05). CONCLUSION: Left ventricular diastolic function is notes not to be impaired in patients with rheumatoid arthritis.
Arthritis, Rheumatoid* ; Humans ; Stroke Volume

By Doppler ultrasound method, 90 healthy persons aged 30-80 were studied. How velocity rate and its values were divided according to time decreased with the age, there was a statistically significant difference between 30-59 age group subjects and >/= 60 age group. Transmitral flow velocity increased progressively with the age, and there was no significant difference in these parameters of transtricuspid flow. The ration of PE/PA, Ei/EA decreased progressively with the age. TRIV, TDE time intervals had the trend to prolonge in > 60 age subjects, whereas TAE seemed to shorten and this difference had statistical significance in comparing to under 60 age subjects
Stroke Volume ; ultrasonography ; Heart Diseases

Humans ; Heart Failure ; Stroke Volume