Perioperative Dexmedetomidine Reduces Delirium after Coronary Artery Bypass Graft Surgery: A Prospective, Single?blind, Observational Study

Background:Delirium is a commonly seen complication of cardiac surgery. Dexmedetomidine, by its anti?inflammatory properties and other effects, can attenuate postoperative delirium. Aims: The aim of this work was to study the incidence of delirium after coronary artery bypass graft surgery, and to compare the effects of dexmedetomidine and propofol on the incidence of postoperative delirium in coronary artery bypass graft surgery patients. Materials and Methods: A prospective, observational study was conducted on 180 consecutive patients undergoing off?pump or on?pump coronary artery bypass graft surgery. The patients were administered either intravenous dexmedetomidine (n = 90) or propofol (n = 90) after hemostasis was achieved, till they were ready for weaning from the ventilator. The Confusion Assessment Method was used to assess the incidence of postoperative delirium. Measurements and Main Results: A total of 25 (13.8%) patients developed delirium after coronary artery bypass graft surgery. Sedation with dexmedetomidine was associated with a significantly reduced incidence of postoperative delirium (8.9% v 18.9% propofol, P = 0.049). Subgroup analyses showed reduced incidence of postoperative delirium in off?pump patients compared to on?pump coronary artery bypass graft patients (3.3% vs. 20%, P = 0.009 dexmedetomidine group and 11.6% vs. 33.3%, P = 0.047 propofol group respectively). The mean age of the patients who had delirium was significantly more (64.9 ± 8.1 years vs. 52.5 ± 5.8 years, P = 0.046) compared to those who did not have delirium. Conclusion: Administration of dexmedetomidine?based sedation resulted in the reduced incidence of postoperative delirium compared to propofol?based sedation in patients after coronary artery bypass graft surgery

Detection of Chlamydophila pneumoniae (Chlamydia pneumoniae) in endarteroctomy specimens of coronary heart diseases patients.

BACKGROUND & OBJECTIVE: Association of Chlamydia pneumoniae with atherosclerosis and coronary artery disease is debated. Increased antibody levels against C. pneumoniae in patients with coronary artery disease is widely reported. Direct evidence would be demonstration of C. pneumoniae, its antigen or genome in the diseased arterial tissue. This study was thus conducted to look for antigen or genome of C. pneumoniae in coronary artery specimens from patients with coronary artery disease along with serology. METHODS: Sixty two end arteriotomy specimens of discarded coronary arteries from patients of coronary heart disease were tested for presence of C.pnuemoniae genome using 2 nested PCR assays and antigen detection by immuno-fluorescence assay. Presence of species specific antibodies were also tested in the patients. RESULTS: C. pneumoniae could not be detected by PCR or immunofluorescence assay in any specimen. C. pnuemoniae Ig G antibody was detected in 42 of the 62 (67.7%) patients studied, compared to 10 of the 23 (43.47%) of controls. Moreover 18 of 62 (29%) patients compared to 4 of 23 (17.39%) controls possessed IgA antibodies. INTERPRETATION & CONCLUSION: Association of C.pneumoniae and coronary artery disease would not be established by genome or antigen detection. However, C. pneumoniae antibodies were detected in more number of patients than controls. More studies are required to reach to a conclusion.

Detection of Chlamydophila pneumoniae (Chlamydia pneumoniae) in endarteroctomy specimens of coronary heart diseases patients.

Background & objectives: Association of Chlamydia pneumoniae with atherosclerosis and coronary artery disease is debated. Increased antibody levels against C. pneumoniae in patients with coronary artery disease is widely reported. Direct evidence would be demonstration of C. pneumoniae, its antigen or genome in the diseased arterial tissue. This study was thus conducted to look for antigen or genome of C. pneumoniae in coronary artery specimens from patients with coronary artery disease along with serology. Methods: Sixty two end arteriotomy specimens of discarded coronary arteries from patients of coronary heart disease were tested for presence of C.pnuemoniae genome using 2 nested PCR assays and antigen detection by immuno-fluorescence assay. Presence of species specific antibodies were also tested in the patients. Results: C. pneumoniae could not be detected by PCR or immunofluorescence assay in any specimen. C. pnuemoniae Ig G antibody was detected in 42 of the 62 (67.7%) patients studied, compared to 10 of the 23 (43.47%) of controls. Moreover 18 of 62 (29%) patients compared to 4 of 23 (17.39%) controls possessed IgA antibodies. Interpretation & conclusions: Association of C.pneumoniae and coronary artery disease would not be established by genome or antigen detection. However, C. pneumoniae antibodies were detected in more number of patients than controls. More studies are required to reach to a conclusion.

Surgical outcome of staged univentricular-type repairs for patients with univentricular physiology and pulmonary hypertension.

BACKGROUND: There is no consensus about the most appropriate limits of pulmonary artery pressure and vascular resistance in case of patients undergoing univentricular or one and one-half ventricular repair. This study was conducted to analyze the mortality and morbidity of a heterogenous group of patients with a functionally univentricular heart and pulmonary artery hypertension, undergoing pulmonary artery banding followed by univentricular-type repairs. METHODS AND RESULTS: Out of 254 patients undergoing pulmonary artery banding for a functionally univentricular heart with increased pulmonary blood flow, 148 patients underwent definitive second stage surgery. Post-band hemodynamic evaluation revealed persistently high pulmonary artery pressure (> 18 mmHg), and pulmonary vascular resistance (>2.0 Woods units/m2) in 78.3% patients. Sixteen patients with moderate right ventricular hypoplasia were given a one and one-half ventricle repair (Group I), 82 patients a bidirectional Glenn connection (Group II), and 50 patients a fenestrated total cavopulmonary connection (Group III). The overall mortality following second stage surgery for the high pulmonary artery pressure group (n=116) was 30.17%, while none of the low pulmonary artery pressure group died (p=0.0009). Pulmonary hypertensive crises and/or systemic desaturation were the main causes of death at second stage repair. All mortality occurred in patients with mean pulmonary artery pressure > 18 mmHg and pulmonary vascular resistance > 3.5 Woods units/m2. Survivors from this group had persistent morbidity in the form of superior vena caval syndrome and suboptimal oxygen saturation (70-75%). CONCLUSIONS: It is advisable not to proceed with definitive second stage repair if post-pulmonary artery banding mean pulmonary artery pressure is over 25 mmHg and pulmonary vascular resistance exceeds 4.0 Woods units/m2. These patients may possibly be deemed to have undergone definitive palliation during their pulmonary artery banding.

Minimally invasive pulmonary artery banding: a new approach.

BACKGROUND: A variety of approaches have been described for banding of the pulmonary artery. The indications for this procedure are limited; however in developing countries, many patients still need pulmonary artery banding for a variety of reasons. We describe a new approach, minimally invasive, using only a split in the manubrium sterni to conduct the procedure. METHODS AND RESULTS: Between January 2000 and May 2002, 19 patients who had undergone pulmonary artery banding using a minimally invasive technique were compared with 20 cases of pulmonary artery banding performed by the conventional technique. The mortality was similar in the two groups (p=0.45). The period of intubation and duration of intensive care unit stay were significantly shorter in the minimally invasive group (p=0.015 and 0.002, respectively). The duration of hospital stay was not significantly different between the 2 groups (p=0.139). In the minimally invasive group, three patients underwent subsequent reoperation. CONCLUSIONS: Minimally invasive pulmonary artery banding is useful in babies with high-flow cardiac lesions and cardiac cachexia.

An infant with "dying spells".

A 45-day-old infant presented with the unusual and intriguing symptom of episodic crying and loss of consciousness. The infant was discovered to have a vascular compression of the trachea by the innominate artery, almost serendipitously. He was cured of his symptoms by anterior suspension of the innominate artery.

Medium-term outcome of anatomically repaired congenitally corrected transposition: the double switch operation.

BACKGROUND: The double switch operation is emerging as the procedure of choice for congenitally corrected transposition of the great arteries. However, rhythm disturbances in the postoperative period are rarely discussed. METHODS AND RESULTS: Eighteen survivors who underwent corrective surgery for congenitally corrected transposition of the great arteries were followed up. Patients in group I (n=8), who also had a ventricular septal defect and pulmonary stenosis, had undergone the Senning plus Rastelli operation. Patients in group II (n=10), who did not have pulmonary stenosis, had undergone the Senning and arterial switch operation. The patients were followed up by periodical clinical examination, echocardiography and 24-hour Holter monitoring. In group I, follow-up ranged from 24 to 66 months (mean 44 months). There was no late death and all the patients are symptom free. There was no significant atrioventricular valve regurgitation and left ventricular function was normal. There were no rhythm disturbances. In group II, follow-up ranged from 2 to 72 months (mean 48 months). There were 2 late deaths due to atrial tachyarrhythmia and residual pulmonary hypertension 36 and 8 months after the procedure, respectively. One patient had significant mitral regurgitation and required mitral valve replacement. Three patients had recurrent atrial/junctional tachyarrhythmia: one of them was lost to follow-up after 1 year while another died of resistant atrial tachyarrhythmia. The third patient underwent mitral valve replacement for severe mitral regurgitation and developed complete heart block necessitating a permanent pacemaker implantation. CONCLUSIONS: Though good long-term results are obtained following the double switch operation, the problem of atrial arrhythmias still needs to be addressed suitably.

Ventricular septal defect with congenital mitral valve disease: long-term results of corrective surgery.

BACKGROUND: A retrospective analysis of the mortality, morbidity and long-term follow-up of patients undergoing corrective surgery for ventricular septal defect and congenital mitral valve disease is presented. METHODS AND RESULTS: Between January 1991 and December 2000, 69 consecutive patients aged 2 months to 45 years (median 18 months) underwent repair of ventricular septal defect and associated mitral valve disease. In 52 patients (75%), the ventricular septal defects were located in the perimembranous and subarterial area. Forty-six patients had congenital mitral incompetence and 23 had congenital mitral stenosis. The ventricular septal defect was repaired through the right atrium in all. Sixty-five patients underwent reconstruction of the mitral valve and 4 underwent primary mitral valve replacement. Another 4 patients underwent mitral valve replacement after a failed repair. Associated procedures included: patent ductus arteriosus ligation (n=12), aortic valve replacement (n=6), coarctation repair (n=13), interrupted aortic arch repair (n=1), atrial septal defect closure (n=17) and Takeuchi repair (n=1). There were 6 early deaths (8.6%). Three deaths were due to pulmonary arterial hypertensive crisis and one due to residual mitral stenosis. One death was due to intractable congestive heart failure. Another patient died due to persistent low cardiac output. Follow-up ranged from 6 months to 120 months (mean 64.4+/-33.6 months). Reoperation was required in 22 patients, mainly for recurrent/residual mitral valve dysfunction or hemodynamically significant left ventricular outflow tract obstruction. There were 4 late deaths, 2 due to residual mitral stenosis and the other 2 as a result of a thrombosed prosthetic valve. At 10 years, the actuarial survival rate was 850+/-5.0%, and freedom from reoperation was 45%+/-10.0%. CONCLUSIONS: Reconstruction of the mitral valve along with closure of VSD is possible in most cases. However, careful follow-up is recommended to detect changes in the mitral valve status over a course of time.