ABSTRACT
The effects of acute right ventricular (RV) pressure and volume overloads on left ventricular (LV) filling are well known, while the significance of chronic RV pressure overload on LV function has been less studied. To evaluate the LV impairment, 30 patients with chronic cor pulmonale and pulmonary arterial hypertension secondary to chronic obstructive lung diseases (COLDs) were studied. All patients underwent respiratory tests and arterial blood gas assessment. An echo-Doppler examination was made to measure LV ejection fraction (EF), RV and LV end-diastolic and end-systolic diameters and areas, RV/LV area indexes, LV diastolic and systolic eccentricity indexes, mitral and tricuspid flow patterns, and mitral flow velocity in late and early diastole (A/E) indexes. A right heart catheterization was carried out to determine the resting mean pulmonary arterial pressure (mPAP). The data showed a marked enlargement of RV, compressing the left through a leftward shift of interventricular septum. A linear regression analysis detected a significant correlation between mPAP and the following parameters: RV/LV diastolic and systolic area indexes (r=0.75, p<0.0001; r=0.84, p<0.000, respectively), mitral A/E index (r=0.61, p<0.0005), and LV diastolic and systolic eccentricity indexes (r=0.93, p<0.0001; and r=0.83, p<0.0001). No correlations were found between echo-Doppler data and functional respiratory parameters. From these results, we conclude that chronic RV pressure overload induces LV filling impairment despite a normal systolic phase, due to septal leftward shift. In fact, chronic RV pressure overload distorts early diastolic LV geometry delaying LV filling phase, and the functional diastolic impairment of the LV is closely correlated to pulmonary hypertension levels.
Subject(s)
Echocardiography, Doppler , Pulmonary Heart Disease/complications , Ventricular Dysfunction, Left/diagnostic imaging , Aged , Blood Flow Velocity , Blood Pressure , Chronic Disease , Female , Humans , Hypertension, Pulmonary/etiology , Hypertension, Pulmonary/physiopathology , Lung Diseases, Obstructive/complications , Male , Middle Aged , Pulmonary Artery , Stroke Volume , Ventricular Dysfunction, Left/etiology , Ventricular Dysfunction, Left/physiopathology , Ventricular Function, RightABSTRACT
In Italy, respiratory intermediate intensive care units (IICUs) are not yet considered as autonomous hospital departments. The IICU of the Rehabilitation Department of the Medical Centre of Gussago (12 monitored beds) provides care for respiratory and cardiac patients. Ventilatory assistance and noninvasive modalities both in treatment and monitoring suggest a multidisciplinary approach to the patient. Highly professional figures should, therefore, be singled out to provide care in a respiratory IICU. The medical staff is composed of one anaesthesiologist, one cardiologist and one pulmonologist, who can integrate care when respiratory complications occur in a cardiological patient, or when cardiac events affect a respiratory patient. Nurses are capable of specific activities, especially when ventilatory assistance is required. The presence of a physiotherapist reduces the nursing workload, especially for ventilated individuals. The psychological aspect is undertaken by a specialist. Finally, an expert in nutrition provides an individualized dietary regimen. Our 4 year experience encourages such a multidisciplinary approach. An ideal integration of the professional activities should provide adequate and individual care for patients admitted to an IICU.
Subject(s)
Respiratory Care Units , Humans , Patient Care Team , Personnel Staffing and Scheduling , WorkforceABSTRACT
Thirty patients with stable chronic obstructive lung disease (COLD) underwent an echo-Doppler examination before and during right heart catheterization. No statistically significant differences between observations for any of two-dimensional echo-Doppler parameters were found. The measurement of all parameters taken during the catheterization correlated better with mean pulmonary artery pressure (mPAP) than those taken before. This difference was most evident for the isovolumetric acceleration time (r = 0.71 before versus r = 0.85 during the catheterization) and relaxation time (r = -0.75 before versus r = -0.87 during the catheterization). The multiple correlation coefficient for all measured parameters and mPAP was 0.83 before and 0.92 during the catheterization. In conclusion, in patients with COLD, it appears possible to get reliable information about PAP using noninvasive techniques.
