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 28,634 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

This paper focuses on the underlying mechanisms contributing to sleep-disordered breathing. Obstructive sleep apnea (OSA) is the most common sleep-related breathing disorder and is characterized by repetitive narrowing or collapse of the pharyngeal airway during sleep. Conversely, central sleep apnea (CSA), highly prevalent in congestive heart failure, is distinguished by a lack of drive to breathe during sleep, resulting in repetitive periods of insufficient ventilation. Both lead to compromised gas exchange, impaired sleep continuity, and catecholamine surges and are associated with major comorbidities including excessive daytime sleepiness and increased risk of cardiovascular disease. Although OSA and CSA exist on a spectrum of sleep-disordered breathing, the 2 entities may overlap in their underlying pathophysiologies. This brief review summarizes the etiology and current understanding of OSA and CSA pathophysiology and the role that the cardiovascular system may play in contributing to disease pathology and highlights the likely substantial overlap that exists between the various forms of sleep-disordered breathing.
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PMID:Mechanisms of apnea. 1911 Jan 33

A study of 10 infants in severe metabolic acidemia (pH below 7) led to the conclusion that the clinical signs-hyperventilation, coma or lethargy, peripheral vascular collapse, a significantly palpable liver, and abdominal distension-may all be directly related to the metabolic acidemia. In five of 10 infants, an initial erroneous diagnosis of congestive heart failure or pneumonia was made. Dramatic clinical improvement followed correction of the acidemia with rapid intravenous administration of sodium bicarbonate. This rapid administration of sodium bicarbonate was safe, provided hypocalcemia was recognized and treated in its early stages. In severe metabolic acidemia the measurement of blood bicarbonate alone does not reflect adequately the magnitude of the acid-base derangement and repeated measurements of hydrogen ion concentration, Pco(2) and bicarbonates are needed to evaluate and treat such infants correctly.
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PMID:Severe metabolic acidemia in infants: clinical and therapeutic aspects. 2032 90

Three cats were evaluated at a veterinary teaching hospital for congestive heart failure (CHF) secondary to hyperviscosity syndrome from plasma cell neoplasia. All cats had severe hyperproteinemia due to hyperglobulinemia. Multiple myeloma or plasma cell neoplasia was diagnosed based on cytopathology and post mortem examination. The cats presented with signs of CHF including acute collapse, tachypnea, increased respiratory effort, and pulmonary crackles. All cats had heart murmurs and echocardiographic signs consistent with hypertrophic cardiomyopathy. An enlarged left atrium was found in all cats and two of three cats also had spontaneous echocardiographic contrast. Plasmapheresis (centrifugal plasma exchange) was performed on all three cats by the removal of whole blood and the infusion of a balanced electrolyte solution while the whole blood was centrifuged and separated. The RBCs were then washed before being readministered to the patient. Plasmapheresis alleviated the clinical signs of CHF (tachypnea) in all three cats. Plasmapheresis should be considered in cases of CHF secondary to hyperviscosity syndrome to rapidly alleviate clinical signs associated with heart failure while diagnosis of the underlying cause is made and appropriate therapy implemented.
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PMID:Treatment of three cats with hyperviscosity syndrome and congestive heart failure using plasmapheresis. 2116 70

Pericardial tamponade limits diastolic filling of the heart; therefore, a high venous pressure is required to fill the ventricle. In presence of cardiac tamponade, therapeutic agents and manoeuvres that results in venodilation or vasodilation can severely compromise diastolic filling of the heart and might result in rapid cardiac decompensation. Equalization of central venous pressure and pulmonary artery diastolic pressure or equalization of pressures in all four chambers during diastole confirms cardiac tamponade. Transthoracic echocardiography can detect the site of tamponade and assist in pericardiocentesis. We describe acute pericardial tamponade in a young man who underwent left posterolateral thoracotomy for left upper lobectomy. Intraoperatively, mobilization of the left upper lobe was frequently associated with hypotension. Postoperatively, the patient suffered two more episodes of hypotension. The episodes of hypotension were attributed to surgical manipulation and epidural blockade. Hemodynamics normalized after discontinuing epidural infusion, volume resuscitation and lobectomy. On third postoperative day, the patient developed cardiovascular collapse; arterial blood pressure and central venous pressure were 70/50 and 12 mmHg. Investigations showed haziness of left lung, and severe respiratory acidosis. On opening of the left thoracotomy wound, pericardial tamponade was diagnosed. A pericardial window was created and tamponade was released with that the hemodynamics normalized. Episodes of unexplained hypotension after left upper lobectomy suggest a cardiac etiology and acute pericardial tamponade is a possibility which should be released immediately otherwise it can result in fatal outcome.
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PMID:Pericardial tamponade after left posterolateral thoracotomy for left upper lobectomy for pulmonary aspergilloma. 2163 31

Patients with end stage renal failure (ESRF) present a number of challenges to the anesthesiologist. They may be chronically ill and debilitated and have the potential for multisystem organ dysfunction. Patients with primary renal disease are likely younger and have good cardiopulmonary reserve. Older patients with renal failure secondary to diabetes mellitus or hypertension may suffer the ravages of diffuse atherosclerosis and heart disease. To safely manage these patients we need to understand the benefits and limitations of dialysis, problems related with primary disease, pathophysiological effects of ESRF, and the altered pharmacology of commonly used anesthetic agents and perioperative medications in ESRF. Problems encountered by anesthesiologist in ESRF patients include hypertension, ischemic heart disease, congestive heart failure, anemia, metabolic acidosis, hyperkaliemia, hyponatremia and circulatory collapse. All surgical procedure in patients with ESRF carries significant risk of peri- and postoperative complications (mostly cardiovascular) and even fatal outcome.
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PMID:Preoperative assessment of patients with end stage renal failure. 2187 62

Chylothorax and chylous ascites are very rare clinical entities generally caused by obstruction and disruption of the thoracic duct. A 60-year-old man presented with exertional dyspnea, fatigue, and chest discomfort of 18-month history. Physical examination revealed S4, bilateral pretibial edema, and moderate amount of ascites. Computed tomography and X-ray of the thorax showed left-sided pleural effusion. Abdominal imaging showed normal liver and spleen structure with intraperitoneal effusion and periportal edema. Thoracentesis and paracentesis yielded a milky, lipemic fluid of exudative nature. Biochemical analysis of the fluids showed a high triglyceride content and elevated lymphocyte count, typical of chylous fluid. All laboratory analyses for possible etiologies including neoplasms, tuberculosis, and cirrhosis were negative. Positron-emission tomography did not show any pathological uptake. Transthoracic echocardiographic examination showed bilateral atrial enlargement, left ventricular hypertrophy, anteroseptal hypokinesia and akinesia, and moderate mitral and tricuspid regurgitation, with an ejection fraction of 25%. Coronary arteries were normal on angiography. The patient was diagnosed with severe congestive heart failure accompanied by chylothorax and chylous ascites. Despite appropriate treatment, there was little change in congestion and no change in symptoms. He died during ultrafiltration therapy due to hemodynamic collapse and asystole.
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PMID:Development of chylothorax and chylous ascites in a patient with congestive heart failure. 2191 21

Acute myocarditis and ventricular arrhythmia are rarely seen as the initial presentation of systemic lupus erythematosus (SLE) in children. We reported the case of a 12-year-old girl with congestive heart failure, acute myocarditis and pericardial effusion as a primary manifestation of SLE. Sudden cardiovascular collapse due to ventricular fibrillation (VF), ventricular tachycardia (VT) and cardiac tamponade occurred. After resuscitation and pericardiocentesis, frequent VF/VT refractory to anti-arrhythmic therapy was supported by venoarterial extracorporeal membrane oxygenation. Early diagnosis and a combination treatment for heart failure, arrhythmias and immunosuppression may result in a favorable outcome.
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PMID:Acute myocarditis and ventricular fibrillation as initial presentation of pediatric systemic lupus erythematosus. 2211 42

Neonatal enterovirus myocarditis is a rare but serious infection that is often an underrecognized cause of cardiovascular collapse. Enterovirus myocarditis in patients with such collapse should be suspected when signs of congestive heart failure and tachyarrhythmia are present. The majority of reported electrical disturbances associated with enterovirus myocarditis are ventricular in origin, but the infection can present as atrial tachyarrhythmia. Atrial tachyarrhythmias associated with enterovirus myocarditis are difficult to manage because of their resistance to conventional antiarrhythmic therapy. We present 2 cases of neonates with atrial tachycardia associated with enterovirus myocarditis who responded to a combination of amiodarone and flecainide.
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PMID:Management of atrial tachycardia in the newborn with enterovirus myocarditis. 2277 84

The Left Ventricular Assist Device (LVAD) is a rotary mechanical pump that is implanted in patients with congestive heart failure to help the left ventricle in pumping blood in the circulatory system. However, using such a device may result in a very dangerous event, called ventricular suction that can cause ventricular collapse due to overpumping of blood from the left ventricle when the rotational speed of the pump is high. Therefore, a reliable technique for detecting ventricular suction is crucial. This paper presents a new suction detection system that can precisely classify pump flow patterns, based on a Lagrangian Support Vector Machine (LSVM) model that combines six suction indices extracted from the pump flow signal to make a decision about whether the pump is in suction, approaching suction, or not in suction. The proposed method has been tested using in vivo experimental data based on two different pumps. The simulation results show that the system can produce superior performance in terms of classification accuracy, stability, learning speed, and good robustness compared to three other existing suction detection methods and the original SVM-based algorithm. The ability of the proposed algorithm to detect suction provides a reliable platform for the development of a feedback control system to control the speed of the pump while at the same time ensuring that suction is avoided.
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PMID:A suction detection system for rotary blood pumps based on the Lagrangian support vector machine algorithm. 2319 2

Obstructive sleep apnoea is an increasingly common disorder of repeated upper airway collapse during sleep, leading to oxygen desaturation and disrupted sleep. Features include snoring, witnessed apnoeas, and sleepiness. Pathogenesis varies; predisposing factors include small upper airway lumen, unstable respiratory control, low arousal threshold, small lung volume, and dysfunctional upper airway dilator muscles. Risk factors include obesity, male sex, age, menopause, fluid retention, adenotonsillar hypertrophy, and smoking. Obstructive sleep apnoea causes sleepiness, road traffic accidents, and probably systemic hypertension. It has also been linked to myocardial infarction, congestive heart failure, stroke, and diabetes mellitus though not definitively. Continuous positive airway pressure is the treatment of choice, with adherence of 60-70%. Bi-level positive airway pressure or adaptive servo-ventilation can be used for patients who are intolerant to continuous positive airway pressure. Other treatments include dental devices, surgery, and weight loss.
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PMID:Adult obstructive sleep apnoea. 2391 Apr 33


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