Kyriakos St. Rammos

Low preoperative HSP70 atrial myocardial levels correlate significantly with high incidence of postoperative atrial fibrillation after cardiac surgery.

PURPOSE OF THE STUDY Atrial fibrillation after cardiac surgery is still a frequent encountered complication and has been associated with increased hospital length of stay and numerous postoperative complications. The pathogenesis of atrial fibrillation involves an overall sequence of perioperative events, collectively termed as ischemia-reperfusion injury. Heat-shock proteins have been found to provide increased protection during ischemia-reperfusion as well as increased postischemic cardiac functional recovery. We sought to determine whether preoperative atrial heat shock levels were correlated with the appearance of postoperative atrial fibrillation. BASIC METHODS Preoperative atrial myocardial samples obtained just before cannulation from 101 patients were used to detect immunohistochemically the expression of heat-shock proteins. The derived results were compared statistically with the incidence of postoperative atrial fibrillation, its time of appearance, duration and resistance to administered antiarrhythmics. PRINCIPAL FINDINGS The overall incidence of postoperative atrial fibrillation was 22.3%. Of these patients, 58.3% had no detectable heat shock proteins in their cytoplasm, in sharp contrast with 100% of the patients with no atrial fibrillation who were positive for heat shock proteins (p<0.01). Four percent of our patient group had prolonged atrial fibrillation (defined as duration >48 h). These patients had significantly less (p<0.01) nuclear heat shock protein expression compared with the non-atrial fibrillation group. However, the difference of the heat shock protein expression between the prolonged atrial fibrillation and the rest of the atrial fibrillation patients was not significant (p=0.891). CONCLUSIONS Our results indicate that patients with low preoperative atrial heat shock protein expression have a significantly greater incidence of postoperative atrial fibrillation. Heat shock protein expression did not, however, correlate with the onset of atrial fibrillation and the resistance to administered medications. Heat shock protein preoperative induction as a measure of myocardial preconditioning may potentially decrease the incidence of postoperative atrial fibrillation.

Primary Intrathoracic Goiter: A Rare and Potentially Serious Entity

BACKGROUND Here we review primary intrathoracic goiter (P-ITG), a rare but potentially serious congenital entity that is distinct from the much more common secondary intrathoracic goiter. The latter is an extension of cervical thyroid that descends within the mediastinum. In contrast, P-ITGs lack a connection with the cervical thyroid and their blood supply comes from intrathoracic vessels. SUMMARY P-ITGs can coexist with a normal or goitrous thyroid gland. When they coexist, either or both may be independently affected by neoplastic, infectious, or infiltrative processes. P-ITGs are mainly located in the anterosuperior mediastinum. Location in posterior or middle mediastinum is observed in 15% of cases, making the diagnosis challenging. Although P-ITGs are rare, they are important because they may reach large dimensions with serious consequences. Compression of the trachea is the most common clinical finding, but compression of other mediastinal organs is also observed. Computerized axial tomography (CT) and radionuclide imaging can suggest or make the diagnosis in most cases. The differential diagnosis includes other mediastinal tumors that show high attenuation on unenhanced CT. The treatment of choice is surgical resection of the goiter through a thoracic approach. Thoracic surgery for resection of a small primary mediastinal goiter is considered to be a relatively safe procedure. Long-standing P-ITGs may cause pressure on the trachea, however, resulting in tracheomalacia. This development is serious in its own right and complicates thoracic surgery. CONCLUSIONS Resection through a thoracic approach is the appropriate treatment for a P-ITG. Surgical intervention is usually indicated without delay upon the establishment of the diagnosis because these goiters exhibit progressive growth. When P-ITGs are small, this approach should prevent the development of tracheomalacia and other serious complications.

Serum levels of matrix metalloproteinases -1,-2,-3 and -9 in thoracic aortic diseases and acute myocardial ischemia

BackgroundMatrix metalloproteinases (MMPs) constitute a family of zinc-dependent proteases (endopeptidases) whose catalytic action is the degradation of the extracellular matrix components. In addition, they play the major role in the degradation of collagen and in the process of tissue remodeling. The present clinical study investigated blood serum levels of metalloproteinases- 1, -2, -3 and -9 in patients with acute and chronic aortic dissection, thoracic aortic aneurysm and acute myocardial ischemia compared to healthy individuals.MethodsThe blood serum levels of MMP-1, -2, -3 and -9 were calculated in 31 patients with acute aortic dissection, 18 patients with chronic aortic dissection, 18 patients with aortic aneurysm and in 13 patients with acute myocardial ischemia, as well as in 15 healthy individuals who served as the control group. Serum MMP levels were measured by using an ELISA technique.ResultsThere were significantly higher levels of MMP-3 in patients with acute myocardial ischemia as compared to acute aortic dissection (17.33 ± 2.03 ng/ml versus 12.92 ± 1.01 ng/ml, p < 0.05). Significantly lower levels of MMP-1 were found in healthy controls compared to all groups of patients (1.1 ± 0.38 ng/ml versus 2.97 ± 0.68 in acute aortic dissection, 3.09 ± 0.98 in chronic dissection, 3.16 ± 0.51 in thoracic aortic aneurysm and 4.58 ± 1.04 in acute myocardial ischemia, p < 0.05). Higher levels of MMP-1 and MMP-3 were detected on males. There was a positive correlation with increasing age (r = 0.38, p < 0.05). In patients operated for acute type A aortic dissection, the levels of MMP-1, MMP-3 and MMP-9 increased immediately after surgery, while the levels of MMP-2 decrease. At 24 hours postoperatively, levels of MMP -1, -2 and -9 are almost equal to the preoperative ones.ConclusionMeasurement of serum MMP levels in thoracic aortic disease and acute myocardial ischemia is a simple and relatively rapid laboratory test that could be used as a biochemical indicator of aortic disease or acute myocardial ischemia, when evaluated in combination with imaging techniques.

Schwannoma of the vagus nerve, a rare middle mediastinal neurogenic tumor: case report

Schwannoma originating from the vagus nerve within the mediastinum is a rare, usually benign tumor. A 44-year old male was presented with chest pain. Chest radiography, CT scan and MRI showed a well circumscribed mass, 5 × 4 cm located in the aortopulmonary window. The mass was found at surgery to be in close proximity with the aortic arch and the left pulmonary hilum, alongside the left vagus nerve. The encapsulated tumor was completely resected through a left thoracotomy incision and it was found to be a benign schwannoma in pathology. The patient is free of recurrence 6 years after surgery.

Prenatal interventional and postnatal surgical therapy of extralobar pulmonary sequestration

Extralobar sequestration, a discrete developmental mass of pulmonary parenchyma which is enclosed within a separate pleural envelope and has its own vascular supply, is recently diagnosed prenatally by ultrasonography. We report two male newborn babies, 10 days old, who prenatally underwent amnioperitoneal shunt, pleural drainage and laser ablation of the feeding artery. Both babies underwent thoracotomy on their 10th day of life, removal of the sequestration, ligation of the feeding vessel which remained patent despite laser treatment in the first case and drainage of a large pleural effusion in the second case. Both babies had an uncomplicated course and are well 80 and 48 months after surgery, respectively. Extralobar sequestration should undergo operation as early as possible after birth, even after prenatal laser ablation of the feeding artery, since mortality and morbidity of surgery are extremely low, while newborns are protected from future infections.

Elevated levels of anti inflammatory IL-10 and pro inflammatory IL-17 in malignant pleural effusions

BackgroundPleural effusions can be caused by highly different underlying diseases and are characterized by complex interactions of various local and circulating cells as well as numerous soluble parameters like interleukins (IL). Knowledge of this complex network can be helpful in order to make the differential diagnosis in known malignant pleural effusions and understand the underlying immunochemistry of each disease or condition.MethodsWe investigated immunoreactive concentrations of Interleukin 10 (IL-10) and Interleukin 17 (IL-17) in malignant pleural effusions and peripheral blood from patients with bronchial carcinomas and other carcinomas, excluding other conditions such as congestive heart failure (CHF) and pneumonias in twenty four (24) patients (9 men/15 women), 37-74 years (mean:61) with already diagnosed malignant pleural effusions applying the ELISA method.ResultsThe SPSS 15 program for Windows was used. Quantitative analysis showed high concentrations of IL-10 and IL-17 in pleural fluid and blood. Even though IL-17 levels -both blood and pleural- were lower than IL-10’s, statistical correlation between blood and pleural concentations was proven, confirming once more the systematic action of these cytokines. At the same time high IL-17 levels in malignant effusions shows maybe a new perspective in understanding the pathophysiology of malignant pleural effusions.ConclusionsOur results confirm the pathogenetic role of these cytokines in malignant pleural effusions combining for the first time a pro- and an anti- inflammatory cytokine. The observation that IL-17 is elevated in malignant pleural effusions may give a new meaning in Virchow’s remarks 100 years ago. Larger number of patients is needed to confirm our hypothesis.