Lung function of patients with heart failure is characterized through a variety of changes propos as being fit to passive congestion.

Lung function of patients with heart failure is characterized through a variety of changes propos as being fit to passive congestion, secondary pulmonary fibrosis, and/or periodical pulmonary emboli. A diffusion impairment contemplation to be due to cyclosporine has also been noted in patients following heart transplantation. Similar changes of unclear origin have been observ in renal transplant recipients. The objective of this studious mood was to determine the bulk to which lung function changes are reversible on cardiac transplantation and relate changes to the status of the recipients lung in the neighborhood of possible vascular, iatrogenic, immune, or infectious injury. We analyzed the data of 22 patients who underwent lung function testing before and after heart transplantation and correlated changes to hemodynamic change, episodes of rejection, concentration of cyclosporine, and cytomegalovirus infection. Despite of the first grade graft function, the carbon monoxide transfer factor deteriorated to a mean of 57 percent of predicted postoperatively. The fall in diffusion factor did not correlate with episodes of cardiac rejection, cyclosporine flushs or hemodynamic status. In those patients who had serologic evidence of cytomegalovirus infection, the reduction in transfer factor was greater compared to those without infection despite a normal chest radiograph. The imports of cardiopulmonary bypass were unlikely to have been responsible for the abnormalities as lung function was assessed at a mean of 14 month after surgery In heart transplant recipients, a change in diffusion capacity may exhibit an additional marker for cytomegalovirus infection and muse infectious/immune injury late following surgery

A reduction in lung dimensions is a consistent feature in patients with heart failure and an additional diffusion deficiency has been described in patients awaiting cardiac transplantation.[1,2] The restrictive blemish resolves following cardiac transplantation as measured by way of spirometry 15 [+ or -] 10 month after surgery[3] There are, however, a number of reasons to what end lung function may remain abnormal following transplantation, including sternotomy and cardiopulmonary bypass,[4] cardiac rejection and failure, and remedy toxicity.[5] An additional factor may be infection in the immunocompromised innkeeper especially with cytomegalovirus (CMV). We have gazeed retrospectively at all patients who underwent cardiac transplantation between April 1989 and December 1991 (n = 92) and mustered the lung function measurements in those patients in whom data available following transplantation could be compared with a pretransplant lung function consideration We examined the relationship between changes in lung function and (1) hemodynamic data before and following surgery (2) in every one's mouth and total cardiac rejection status, (3) passing from hand to hand and average whole blood long tray cyclosporine concentrations, and (4) CMV infection.

METHODS

Data were available from 22 cardiac transplant patients (21 male; mean age, 50 years; range, 17 to 60 years; 19 exsmokers) who had lung function studies complet before and following surgery Before surgery all of the patients had stiff congestive cardiac failure (New York Heart Association grade 3 or 4) Lung function testing was carried gone out at an initial transplantation assessment an average 67 month (1 to 26 months) before surgery and an average 14 month (1 to 42 months) after surgery Six patients had been treated with amiodarone prior to surgery and single in kind patient had suffered a pulmonary embolus (prov by means of ventilation perfusion scan). No other patient had evidence of pulmonary emboli, it being a relative contraindication to transplantation.[6]

Lung function was measured as follows: forced expiratory body in 1 s ([FEV.sub.1]); forced vital capacity (FVC); residual bulk (RV); functional residual capacity (FRC) (Gould Pulmonet 111 wet spirometer); maximal inspiratory and expiratory grow volume loop; total lung capacity (TLC) (Jaeger corpse Plethysmograph). For single breath carbon monoxide diffusion (Dco) and gas transfer coefficient (Kco) (PK Morgan transfer test) at least four reproducible and technically satisfactory recordings were obtained. The largest value was preferableed for analysis. The transfer criterion was calibrated for each patient and the subject of attention was performed by an experienced qualified physiology technician. the pair the expired and inspired gas were enslaveed to analysis. All Dco values were corrected for hemoglobin although no patient was anemic. Predicted values were obtained from the European Community for Coal and dagger predicted equations.[7] Each patient was capable of holding his/her breath for 10 s and a variable was supposeed abnormal if less than 20 percent predicted. Quality bridle (lung function studies are performed at a respiratory physiology technician) is carried disclosed on a weekly basis at this regional respiratory physiology center

Pulmonary artery compressing (PAP), pulmonary capillary wedge compressing (PCWP), and pulmonary vascular resistance (PVR) were garner uped from the preoperative assessment data. Postoperatively PAP, PCWP were recorded at the time of right ventricular endomyocardial biopsy and a chest radiograph. Pulmonary function exhibitions were completed on the same day prior to the heart biopsy being performed.

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