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Query: UMLS:C0015672 (fatigue)
 51,768 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

During the period 1960 to 1978, 98 patients underwent intracardiac repair of Fallot's tetralogy after palliative operations. Preoperative symptoms were cyanosis, dyspnea, increased fatigue with squatting and hypoxic spells. The hemoglobin concentration varied from 19 to 22 g/100 ml. At correction only 65 of 95 shunts were patent and needed surgical closure. Seventeen early deaths occurred (19%), the main causes being cardiac failure and arrhythmia. One patient died 3 years after correction from pneumonia. The subjective clinical result was excellent or good in all surviving patients. At repeat heart catheterization in 26 patients a high percentage of residual ventricular septal defects and pulmonary stenosis/insufficiency was found. However, the majority of defects were of minimal haemodynamic significance, and so far did not seem to do harm to the patients' subjective function.
J Cardiovasc Surg (Torino)
PMID:Correction of Fallot's tetralogy after palliative operations. 8 99

Glutaraldehyde-preserved porcine mitral leaflet tissue has been subjected to extended accelerated fatigue loading in Ringer's solution containing 0.15% glutaraldehyde. Five tissue test pieces were subjected to cyclic tensile stresses of 50 and 200 Gm. per square millimeter and to 300 million to 800 million accumulated fatigue cycles. Tissue disruption occurred in each of the fatigued test pieces. Tensile loading, apart from reducing the acuteness of the collagen waveform and thereby decreasing tissue compliance, does not contribute significantly to the disruption process nor its rate of occurrence. Compressive flexure occurring during the unloading half of the fatigue cycle, however, does induce damage in the tissue. Mechanisms involved in the disruptive processes have been identified by conducting simultaneous morphologic and stress/strain observations on both the fatigued and unfatigued tissues in their wet functional condition. This vulnerability of the preserved tissue to compressive flexure could well affect the long-term durability of the glutaraldehyde-preserved heterograft valve, and this possibility is discussed in relation to the clinical use of these valves.
J Thorac Cardiovasc Surg 1978 Aug
PMID:Fatigue-induced damage in glutaraldehyde-preserved heart valve tissue. 9 72

A case is presented of a 60-year-old woman with fatigue, dyspnea, and chest pain. A chest x-ray film revealed an abnormal cardiac silhouette. Echocardiography revealed a large, echo-free area with well-demarcated, discrete borders adjacent to the right heart border. This structure decreased in size with inspiration and did not show pulsatile cardiac motion. Cardiac catheterization confirmed the extracardiac nature of the lesion and also showed a "constrictive" pattern with equalization of diastolic pressures. Surgical exploration revealed a large cystic thymoma. With removal of the tumor, intracardiac pressures returned to normal.
J Thorac Cardiovasc Surg 1975 Jul
PMID:Cystic thymoma simulating contrictive pericarditis. The role of echocardiography in the differential diagnosis. 12 66

Revascularization of the heart is a means of relieving symptoms of coronary artery disease--such as angina, fatigue, and dyspnea. The question of whether revascularization prolongs the life of the patient has been debated. My colleagues and I have reviewed our years of experience with patients treated by implantation of internal mammary arteries into the ventricles. We have compared our series with other groups of patients treated medically. Our conclusion is that revascularization via internal mammary artery implants does increase longevity.
J Thorac Cardiovasc Surg 1975 Sep
PMID:Evidence that revascularization by ventricular-internal mammary artery implants increases longevity. Twenty-four year, nine month follow-up. 24 Sep 82

In the period 1957--1976 481 patients under 40 years of age were operated on. Dyspnoea and increased fatigue were dominating symptoms in more than half of the series. In 202 cases the anomaly was discovered at routine examination in the absence of relevant symptoms. Almost half of the patients were operated under hypothermia, in the others extracorporeal perfusion was used. Four hospital deaths occurred, two of which were related to cardiopulmonary bypass.
Scand J Thorac Cardiovasc Surg 1979
PMID:Atrial septal defect of secundum type in patients under 40 years of age. A review of 481 operated cases. Symptoms, signs, treatment and early results. 47 71

A 9-year-old girl presented for cardiac evaluation with symptoms of dyspena, fatigue, and cyanosis with exercise. Cardiac catheterization demonstrated an atrial septal defect; an anomalous right superior pulmonary vein was suspected but not confirmed. Operation disclosed anomalous drainage of the right superior and inferior pulmonary veins into the right atrium, an intact fossa ovalis, and an inferior sinus venosus defect. Repair was accomplished by detaching the posterior edge of the atrial septum and suturing it to the right of the pulmonary veins, so that the defect was closed and all the pulmonary venous blood was directed to the left atrium.
J Thorac Cardiovasc Surg 1979 Oct
PMID:Surgical repair of inferior sinus venosus atrial septal defect. 48 Sep 65

Two Hancock Model 242 prostheses, tissue anulus diameter 21 mm., were tested in a closed, low-volume, accelerated fatigue tester. The fluid media was sterils fresh-frozen plasma. The normal human aortic root was simulated. The cyclic rate was 20 Hz at 37 degrees C. The prostheses developed severe fatigue at 77 million cycles. Fraying of the free edges was found after 2 million cycles. Small tears near the commissures and then holes between collagen bundles at the base of the leaflets appeared at 7 million cycles. At 71 million cycles the leaflets began to tear and complete prolapse, with gross valvular insufficiency occurring at 77 million cycles. The accelerated wear of Hancock procine prosthesis is frequency dependent and independent of media and the flow geometry of the testing device.
J Thorac Cardiovasc Surg 1979 Aug
PMID:In vitro durability of Hancock Model 242 porcine heart valve. 57 54

To evaluate the effectiveness of the configuration of the stimulating waveform on diaphragm pacing, we evaluated several different current forms: UDC-bipolar, UDC-monopolar cathodal, UDC-monopolar anodal, and ABDC. During stimulation with a pulse interval of 37 msec., a decrease in tidal volume was observed during the initial 30 hours with UDC-bipolar and UDC-monopolar anodal waveforms. Both UDC-monopolar cathodal and ABDC stimulation maintained the initial effectiveness for 6 hours. The decrease in tidal volume of UDC-monopolar anodal closely paralleled that of UDC-bipolar stimulation. Decreasing the pulse interval to 20 msec. caused a decrease in tidal volume with both UDC-monopolar cathodal and ABDC waveforms. Arterial oxygen tension (PaO2) in these experiments decreased to about 60 mm. Hg soon after the onset of unilateral diaphragm pacing. The concomitant decrease in tidal volume seen with UDC-bipolar stimulation could be avoided through the administration of oxygen to keep the animal's PaO2 about 100 mm. Hg. The amplitude of the evoked diaphragmatic action potentials decreased significantly under hypoxemia and returned to normal with hyperoxygenation. From these short-term experiments, our findings indicate that waveform configuration does influence the time of onset of diaphragm fatigue due to either an neuromuscular junction. Further, hypoxemia accelerates the occurrence of fatigue.
J Thorac Cardiovasc Surg 1977 Jul
PMID:Diaphragm pacing. Evaluation of current waveforms for effective ventilation. 87 25

By attaching appropriate measuring devices to the wall of an intact aortic root at the level of leaflet coaptation, we have measured a 16 per cent diameter change during each cardiac cycle. The dimensional changes observed can by themselves explain aortic valve function and obviate the postulation that the leaflets shorten and lengthen during each cardiac cycle. The tissue composition of the aortic root and leaflets is more compatible with this theory than with other postulations. Such a dynamic aortic root may explain the longevity of the actual aortic leaflets, in that leaflet fatigue stress is minimized by changes in aortic root dimension.
J Thorac Cardiovasc Surg 1976 Sep
PMID:The dynamic aortic root. Its role in aortic valve function. 95 58

An interesting case of congenital intrapericardial aneurysm of the left-atrial appendage is reported. The patient presented with recurrent supraventricular arrhythmias and progressive exercise intolerance and fatigue. Computerised axial tomography aided in the diagnosis by excluding the presence of any thrombus in the sac. The aneurysm could be safely excised via a left thoracotomy without cardiopulmonary bypass. The relevant literature on this problem is briefly discussed.
Thorac Cardiovasc Surg 1992 Dec
PMID:Congenital intrapericardial aneurysm of the left-atrial appendage. 129 Jan 87


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