20 Jan

Prediction of Pulmonary Arterial Pressure in Chronic Obstructive Pulmonary Disease by Radionuclide Ventriculography: Conclusion

In contrast, Marchandise et al found a correlation between the acceleration time measured by Doppler echocardiography and PAP in patients with COPD. In our study, the time between the onset and peak pulmonary flow velocity is reflected by the difference between time to peak ejection rate and pre-ejection period. This parameter has not allowed an […]

19 Jan

Prediction of Pulmonary Arterial Pressure in Chronic Obstructive Pulmonary Disease by Radionuclide Ventriculography: Discussion

The most commonly used radionuclide parameter is the RVEF. Indeed, correlations have been found between pulmonary arterial pressure and RVEF, but within both the normal and abnormal range, the variability of estimated pulmonary arterial pressure is important and small changes in RVEF may reflect large variations in pulmonary pressure. Therefore, more reliable radionuclide parameters have […]

12 Jan

Prediction of Pulmonary Arterial Pressure in Chronic Obstructive Pulmonary Disease by Radionuclide Ventriculography: Results

Study Protocol In group 1, Kr RVEF was measured at rest and correlated to the pulmonary hemodynamic measurements performed during the same week. In group 2, “”Tc RVEF and the other noninvasive parameters were correlated to pulmonary arterial pressures and resistances measured simultaneously. Statistics These consisted of linear, logarithmic and exponential correlations between noninvasive parameters […]

06 Jan

Prediction of Pulmonary Arterial Pressure in Chronic Obstructive Pulmonary Disease by Radionuclide Ventriculography: Material and Methods

Hemodynamic Determination A triple lumen thermodilution 7F Swan-Ganz catheter was introduced into the right internal jugular vein using the Seldinger technique, and advanced under constant pressure wave and fluoroscopic control in the right pulmonary artery. Pulmonary pressure was measured using a physiologic pressure transducer and recorded on a thermal writing recorder. The zero reference was […]

05 Jan

Prediction of Pulmonary Arterial Pressure in Chronic Obstructive Pulmonary Disease by Radionuclide Ventriculography

Chronic obstructive pulmonary disease is one of the chief causes of disability and death in Europe and in the United States. Pulmonary hypertension triggers the development of right ventricular hypertrophy which may lead to right ventricular failure with a high mortality rate. The measurement of PAP requires right heart catheterization. Although this technique is widely […]

27 Apr

Patients with Chronic Paralytic/Restrictive Ventilatory Dysfunction: Conclusion

The use of BVs causes significant dSa02 and more than ten episodes of 4%dSa02 per hour in over 50 percent of patients with CAH who use them. Considering the fact that the effectiveness of BV use has been reported to decrease with time, all patients using BVs should have regular sleep screening of Sa02 and […]

26 Apr

Patients with Chronic Paralytic/Restrictive Ventilatory Dysfunction: Discussion (4)

Systolic and diastolic blood pressures increase an average of 25 percent with apneas, with the rise being proportional to the severity of dSa02. Various cardiac arrhythmias occur in over 80 percent of OSAS patients. Premature ventricular contractions have been reported to increase threefold when Sa02 is less than 60 percent. Prolonged apneas with severe hypoxemia, […]

25 Apr

Patients with Chronic Paralytic/Restrictive Ventilatory Dysfunction: Discussion (3)

The normalization of Pco2 by adequate ventilation even without correction of the underlying cause of obstructive dSa02 would also be expected to reduce the severity of dSaCV The patients with the highest mean Sa02 were least likely to have symptoms of hypoventilation and in general had the fewest and least severe episodes of 4%dSaOz per […]

24 Apr

Patients with Chronic Paralytic/Restrictive Ventilatory Dysfunction: Discussion (2)

All of the patients in this study had dSa02 due to chronic underventilation, periods of upper airway obstruction, or both during BV use. In our population, chronic underventilation would be most likely to occur with use of the less efficient BVs (;ie, the chest shell and the rocking bed). This was supported by the cases […]

23 Apr

Patients with Chronic Paralytic/Restrictive Ventilatory Dysfunction: Discussion (1)

Negative-pressure body ventilators provide ventilatory assistance by increasing the gradient between atmospheric pressure and intrathoracic pressure during the patients inspiratory effort. In this way, the mechanism of air inflow is similar to and augments or replaces the tidal volumes of unassisted breathing. Inductive plethysmography can be used to detect paradoxical chest and abdominal wall motion […]

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