Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UMLS:C0034065 (pulmonary embolism)
 14,979 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

MODALITIES FOR THE DIAGNOSIS OF VENOUS THROMBOEMBOLISM: Currently rely on the confrontation of the initial clinical data and the results of D-dimer measurements, a venous Doppler, although reliable, is not a first-line exploration. REGARDING TREATMENT: Indications for thrombolysis are currently limited to massive pulmonary oedema with shock. Alteplase added to heparin improves the progression of severe embolism; it spares the patients from heavy interventions of resuscitation but the mortality remains the same. Concerning anticoagulant treatments, prolonged antivitamin K at classical doses is more effective than low doses and for limited duration if phlebitis is an idiopathic one. FOR HEART FAILURE WITH PRESERVED EJECTION FRACTION: Treatment of these heart failures, formerly know as 'diastolic' is similar to that of the acute phase of systolic heart failure. However, care should be taken with vasodilatators. CONCERNING HEART FAILURE IN GENERAL: The brain natriuretic peptide (BNP) represents a remarkable progress for the aetiological diagnosis of dyspnoea (inferior to 80 pg/ml in the case of pulmonary origin, superior to 300 pg/ml in the case of cardiac origin or severe pulmonary embolism). Regarding treatment, for acute heart failure, it is still the association of nitrates and diuretics, with oxygen therapy and eventually inotropics. Beta-blockers, which have revolutionized the treatment of chronic heart failure, must be maintained whenever possible in the case of the onset of acute pulmonary oedema. Multisite pacing is increasingly used in refractory chronic heart failure. Implantable defibrillation has become common practice. Non-invasive ventilation (Bi or C-PAP) is interesting in acute cardiogenic pulmonary oedema. THE PREVENTIVE ROLE OF N ACETYL-CYSTEINE: N acetyl cysteine reduces the incidence of nephropathies induced by the radio contrast products in patients with chronic kidney failure. Combined with hydratation, it must be proposed the day before and on the day of the procedure in any patient with diabetes or kidney failure.
 ...
PMID:[Diagnostic and therapeutic progress. Venous thromboembolism, cardiac insufficiency and radio contrast agents]. 1522 98

We describe 3 patients who presented to the emergency department (ED) with stroke, deep venous thrombosis, or pulmonary embolism and renal failure after undergoing cardiac surgery 7 to 17 days earlier. Their onset of thrombosis after previous heparin exposure was temporally plausible for complications of heparin-induced thrombocytopenia, an immune-mediated thrombotic disorder triggered by heparin. The patients had normal platelet counts at presentation, yet each had circulating heparin-induced thrombocytopenia antibodies that were ultimately confirmed. Two patients had heparin reexposure in the ED, 1 of whom developed thrombocytopenia with new thrombosis and died. Alternative parenteral anticoagulation prevented further thrombosis in 2 patients. Because heparin use can be catastrophic in patients with heparin-induced thrombocytopenia, physicians should be vigilant in suspecting heparin-induced thrombocytopenia in patients with thrombosis after recent hospitalization or heparin exposure. Alternative anticoagulants are available for these at-risk patients.
 ...
PMID:Heparin-induced thrombocytopenia in the emergency department. 1552 Jul 11

Low-molecular weight heparins (LMWHs) have been shown to be as safe and effective as unfractionated heparin (UFH) for the treatment of acute venous thrombosis and non-life-threatening pulmonary embolism. Different reports have shown that LMWHs may also be used to treat patients with unstable angina or non-Q-wave infarction. The safety of LMWHs used at therapeutic dose has been widely studied in pivotal clinical trials and analysed in several meta-analyses. However, despite the wide development and use of LMWHs, several issues regarding the safety and optimal use of LMWHs remain unanswered. The main adverse effect of LMWHs is bleeding and it is uncertain whether a weight-adjusted dosage regimen without laboratory monitoring can be used in patients with a high risk of bleeding, such as patients with renal failure, elderly patients, obese patients or pregnant women. These patients are usually excluded from clinical trials and only a few studies, not sufficiently powered to estimate efficacy and safety, have been carried out in these special populations. Most of the available data comes from pharmacokinetic or population pharmacodynamic studies or clinical reports. Results in patients with renal impairment who are not undergoing haemodialysis suggest that a reduction in calculated creatinine clearance levels is associated with an increased risk of accumulation of anti-Xa activity, the extent of which differs depending on the individual LMWH and the extent to which the compound is cleared by the kidney. The limited data available regarding the use of therapeutic doses of LMWHs in obese patients suggest that there is no need to cap the dose at a maximal allowable dose. Long-term (3-month) treatment with LMWHs appears to be as effective and safe as oral anticoagulant therapy for the treatment of venous thromboembolism. It appears that each LMWH is a distinct compound with unique pharmacokinetic and pharmacodynamic profiles. Until more data are available regarding these special populations, periodic monitoring of anti-Xa activity levels may be recommended to detect accumulation and/or an overdose and minimise the bleeding risk. The non-haemorrhagic adverse effects of the LMWHs include heparin-induced thrombocytopenia (HIT) and osteoporosis. The incidence of HIT appears to be lower with LMWHs than with UFH; there is currently not enough data to compare the frequency of HIT between the various LMWHs. LMWHs also appear to carry a lower risk of causing osteoporosis than UFH. In conclusion, studies that include special population patients are required to make conclusive recommendations concerning the safety and monitoring of the different LMWHs.
 ...
PMID:Safety profile of different low-molecular weight heparins used at therapeutic dose. 1578 42

Current guidelines for the diagnosis of non-ST-segment elevation myocardial infarction are largely based on an elevated troponin level. While this rapid and sensitive blood test is certainly valuable in the appropriate setting, its widespread use in a variety of clinical scenarios may lead to the detection of troponin elevation in the absence of thrombotic acute coronary syndromes. Many diseases, such as sepsis, hypovolemia, atrial fibrillation, congestive heart failure, pulmonary embolism, myocarditis, myocardial contusion, and renal failure, can be associated with an increase in troponin level. These elevations may arise from various causes other than thrombotic coronary artery occlusion. Given the lack of any supportive data at present, patients with nonthrombotic troponin elevation should not be treated with antithrombotic and antiplatelet agents. Rather, the underlying cause of the troponin elevation should be targeted. However, troponin elevation in the absence of thrombotic acute coronary syndromes still retains prognostic value. Thus, cardiac troponin elevations are common in numerous disease states and do not necessarily indicate the presence of a thrombotic acute coronary syndrome. While troponin is a sensitive biomarker to "rule out" non-ST-segment elevation myocardial infarction, it is less useful to "rule in" this event because it may lack specificity for acute coronary syndromes.
 ...
PMID:Narrative review: alternative causes for elevated cardiac troponin levels when acute coronary syndromes are excluded. 1586 11

Ventilation and perfusion scanning is still used as the first modality for evaluating pulmonary embolism in pregnant and renal failure patients and those who are allergic to radiographic contrast. Hot spots in the right atrial area on perfusion scan are the result of the presence of thrombi. These thrombi are of 2 varieties. One type is a free-floating thrombus, which needs emergency thrombectomy, and another type is thrombus formation in the atria, predisposed by the presence of catheters. We report a study showing essentially normal perfusion but intense tracer uptake in the superior vena cava and right atrium. Noncontrast computed tomography confirmed the thrombus.
 ...
PMID:Superior vena cava and right atrial thrombus detected on lung perfusion scintigraphy. 1610 Apr 84

(1) The reference drug for prophylaxis against venous thromboembolism after hip or knee replacement surgery is a low-molecular-weight heparin (LMWH), given subcutaneously for 1 to 5 weeks. Vitamin K antagonists, including warfarin, have similar risk-benefit balances. (2) Subcutaneous melagatran and its oral metabolic precursor ximelagatran have recently been granted marketing authorisation in France for use as prophylaxis after hip or knee replacement surgery. Melagatran, unlike LMWH, is a specific thrombin inhibitor. (3) There are four randomised double-blind trials in more than 9000 patients comparing these agents with a LMWH (enoxaparin in three trials, dalteparin in one). Melagatran was given subcutaneously for one or two days before being replaced with ximelagatran (as soon as oral feeding was possible) for 6 to 9 days. These trials showed no advantage of melagatran-ximelagatran in terms of clinical endpoints such as symptomatic deep venous thrombosis, pulmonary embolism, and death from all causes. (4) Three randomised double-blind trials have compared ximelagatran with warfarin in more than 5000 patients. Treatment lasted 7 to 12 days. Ximelagatran was no better than warfarin when assessed using clinical endpoints. (5) In these trials melagatran-ximelagatran did not increase the risk of bleeding compared with LMWH or warfarin. (6) Melagatran-ximelagatran can cause an increase in serum transaminase activity, and is contraindicated if pretreatment serum transaminase activity is more than twice the upper limit of normal. (7) Trials versus warfarin showed a higher risk of myocardial infarction in patients taking ximelagatran (0.7% versus 0.16%). (8) There are few data on the patient subgroups most likely to receive melagatran-ximelagatran, namely patients over 75, underweight and overweight patients, and patients with renal failure. (9) There is currently no clotting test that allows the melagatran-ximelagatran dose regimen to be adjusted in patients who have an increased risk of adverse effects due to overdosing. There is no available antidote if overdose occurs. (10) Erythromycin increases melagatran bioavailability, thereby increasing the bleeding risk. Melagatran and ximelagatran must not be combined with other anticoagulants, thrombolytic agents or antiplatelet drugs because of a increased bleeding risk. (11) In practice, low-molecular-weight heparin remains the reference prophylactic treatment for venous thromboembolism after hip or knee replacement surgery.
 ...
PMID:Melagatran and ximelagatran: new drug. No real simplification of anticoagulant therapy. 1610 94

Cardiac troponin I (cTnI) and cardiac troponin T (cTnT) are valuable heart markers in patients presenting with symptoms of ischaemic heart disease. A number of categories of patients frequently have raised concentrations of cardiac troponin (cTn) without having ischaemic heart disease. These include patients with heart diseases such as heart failure, myocarditis and valvular disease but also those with lung emboli, renal failure and sepsis. Possible underlying mechanisms are diffuse necrosis, cTn proteolysis or leakage of cytoplasmatic cTn with no irreversible damage to the contraction complex of heart-muscle cells. It is possible that cTn-measurement in patients with non-cardiac conditions is of prognostic value but so far this has only been demonstrated in dialysis patients and patients with pulmonary embolism.
 ...
PMID:[The significance of elevated troponin levels in the absence of acute cardiac ischaemia]. 1661 May 13

An ideal cardiac biochemical marker should have not only high sensitivity but also high specificity to myocardial infarction. The creatine kinase-MB, a relatively specific cardiac marker, could be elevated in situations other than acute myocardial infarction, such as renal failure, muscular injury, and myopathy. Although these are more specific than creatine kinase-MB, cardiac troponins have also been reported to be elevated in conditions other than acute myocardial infarction, such as chronic renal failure, acute myocarditis, cardiomyopathy, congestive heart failure, pulmonary embolism, rhabdomyolysis, sepsis, and left ventricular hypertrophy. With the ongoing research in this field, future holds hopes of finding an ideally specific marker of myocardial infarction, but until then biochemical markers should be used in conjunction with clinical assessment and electrocardiography in making the diagnosis of myocardial infarction, and the patients should not be treated merely on the basis of elevated serum levels of cardiac biochemical markers.
 ...
PMID:Role of biochemical markers in diagnosis of myocardial infarction. 1616 23

We examined surgical complications among a group of diabetic type 1 patients (IDDM) with end-stage renal disease (ESRD) who had undergone pancreas-kidney transplantations (PK). Between October 1993 and August 2004, 70 SPK were performed using bladder (n = 14) or enteric (n = 56) drainage. Donors were selected according to standard criteria (mean age, 27.6 years; range, 17-49). All patients received cyclosporine-based immunosuppression. All pancreata functioned immediately, whereas 2 patients needed postoperative dialysis. Four patients (5.7%) lost their pancreatic graft due to vascular thrombosis; both patients underwent urgent allograft pancreaectomy and pancreas retransplantation (re-PT). One of them (1.4%) experienced a venous thrombosis and died due to a pulmonary embolism at 12 hours after re-PT. The other 3 patients had uneventful postoperative courses and were discharged with good pancreatic and renal function. Three patients in the bladder group (21.4%) had an anastomotic leak, which resolved with a bladder catheter. Four patients in the enteric group (7.1%) who experienced an anastomotic leak needed a second surgical procedure but in 3 of them allograft pancreatectomy was necessary. Relaparotomy was required in the other 3 patients due to hemorrhage (1 patient) or occlusion (2 patients). Acute rejection episodes, which occurred in 16 patients (22.8%), were treated with steroid boluses. With a mean follow-up of 72 months (range, 3-129), 2 patients have died at 8 and at 36 months, respectively, after SPK due to acute myocardial infarction (2.9%). Chronic rejection was the leading cause of pancreatic failure in 5 patients (7.1%) and of renal failure in 2 patients (2.8%). Patient, kidney, and pancreas survival rates were 95.8%, 92.9%, and 81.5%, respectively. Surgical complications were the leading cause of pancreatic allograft loss in IDDM and ESRD patients submitted to SPK.
 ...
PMID:Surgical complications are the main cause of pancreatic allograft loss in pancreas-kidney transplant recipients. 1618 75

The initial treatment of patients with acute pulmonary embolism has traditionally involved unfractionated heparin. Given the more predictable pharmacodynamic and pharmacokinetic properties of low molecular weight heparins, their simpler (fixed) dosing regimens, and few or no laboratory monitoring requirements, low molecular weight heparins are gradually replacing heparin for the initial treatment of most patients diagnosed with acute pulmonary embolism, except in very obese patients or patients with renal failure. Only selected patients with massive, life-threatening pulmonary embolism should be managed with intravenously administered thrombolytic drugs, surgical embolectomy, or catheter-based embolectomy. Likewise, inferior vena caval filter should be considered only in patients with an absolute contraindication to, or a documented failure of, anticoagulant therapy. New anticoagulants, such as ximelagatran, an oral direct thrombin inhibitor, or fondaparinux and idraparinux, selective factor X(a) inhibitors with an almost complete bioavailability after subcutaneous injection are promising alternatives, but these drugs have yet to find a place in the initial treatment of pulmonary embolism in standard day-to-day clinical practice. Long-term anticoagulation treatment is still provided by antivitamin K antagonists (eg, warfarin), which unfortunately have a narrow therapeutic window. Consequently, time-consuming monitoring is required to ensure the therapeutic anticoagulant effect. A target International Normalized Ratio (INR) of 2.5 (INR range: 2.0 to 3.0) is recommended for warfarin therapy. This treatment should be continued for at least 3 months for patients with a first episode of pulmonary embolism secondary to a transient (reversible) risk factor, or up to 6 to 12 months for patients with a first episode of idiopathic pulmonary embolism.
 ...
PMID:Pulmonary embolism: current treatment options. 1628 76


<< Previous 1 2 3 4 5 6 7 8 9 10 Next >>