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A premature ventricular contraction (PVC) is a common event where the heartbeat is initiated by Purkinje fibers in the ventricles rather than by the sinoatrial node. PVCs may cause no symptoms or may be perceived as a "skipped beat" or felt as palpitations in the chest. PVCs do not usually pose any danger. [1]
A pulmonary embolism is a blood clot that's made its way to the arteries that connect the heart and the lungs, which can cause chest discomfort and shortness of breath, Blankstein explains.
Chest pain, tightness or burning sensation [4] Chronic: Persistent cough [4] Shortness of breath [2] Increased susceptibility to respiratory illness [4] Symptoms of chronic chemical pneumonitis may or may not be present, and can take months or years to develop to the point of noticeability. [4]
Humans can smell chlorine gas at ranges from 0.1–0.3 ppm. According to a review from 2010: "At 1–3 ppm, there is mild mucous membrane irritation that can usually be tolerated for about an hour. At 5–15 ppm, there is moderate mucous membrane irritation. At 30 ppm and beyond, there is immediate chest pain, shortness of breath, and cough.
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Palpitations are not always the result of a physical problem with the heart and can be linked to anxiety. [3] However, they may signal a fast or irregular heartbeat. Palpitations can be brief or long-lasting. They can be intermittent or continuous. Other symptoms can include dizziness, shortness of breath, sweating, headaches, and chest pain. [2]
Psychogenic causes of chest pain can include panic attacks; however, this is a diagnosis of exclusion. [12] In children, the most common causes for chest pain are musculoskeletal (76–89%), exercise-induced asthma (4–12%), gastrointestinal illness (8%), and psychogenic causes (4%). [13] Chest pain in children can also have congenital causes.
Many different conditions can lead to the feeling of dyspnea (shortness of breath). DiagnosisPro, an online medical expert system, listed 497 in October 2010. [1] The most common cardiovascular causes are acute myocardial infarction and congestive heart failure while common pulmonary causes include: chronic obstructive pulmonary disease, asthma, pneumothorax, and pneumonia.