What are beta blockers and how do they work? Beta blockers, also known as beta-adrenergic blocking agents, are a class of drugs that works by blocking the neurotransmitters norepinephrine and epinephrine from binding to receptors. There are three known types of beta receptors, known as beta1 (Î²1), beta2 (Î²2) and beta3 (Î²3).
Although many newer imaging techniques for the evaluation of lung pathology have been developed, auscultation of the chest remains an invaluable clinical tool and is still probably the most common method of evaluating the lung. Evaluation of lung sounds is a routine part of a clinical examination. Breath sounds can be classified into 2 broad categories: normal breath sounds and adventitious (or abnormal) sounds. Adventitious breath sounds include wheezes, coarse crackles, fine crackles, and rhonchi. See the video of breath sound assessment, below.
Distant heart sounds. Introduction. Doctors with a stethoscope heart auscultation if the first heart sound and the second heart sound are weak, heavy cloud, blurred distant sense of those who, for the heart sound far away. Patients are often forced to take semi-recumbent, sitting forward, if supine is the heart sounds more distant. Tuberculous, cancerous, suppurative, rheumatic and some connective tissue diseases caused by pericardial effusion may cause heart sounds distant. Heart sounds far from some patients with chest pain, shortness of breath, difficulty breathing, shallow breathing, cyanosis, poor pulse pressure, congestive splenomegaly and other symptoms.