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mechanical valve asthma mitral stenosis mitral regurgitation prosthetic valve lungs biological valve tamponade acidosis arterial puncture alcalosis dyspneea clinical cases ventricular fibrillation atrial flutter ventricular tachycardia cardiac arrhythmia atrial fibrillation catheter cardiac ablation dvt pulmonary embolism deep vein thrombosis ecg stelate ganglion; block; bronchospasm wheezing bronchoilators respiratory ventolin implantable defibrillator left heart failure pacemaker heart xray chest miral valve pefr bronchodilators pericardtis pe