A very large range of medical conditions can cause<unk> . These include, but are not limited to: * Hypovolemic shock * Trauma, especially those with massive hemorrhage * Surgery, particularly on patients who have lost blood * Hemorrhagic conditions, e.g. upper gastrointestinal bleeding (esophageal varices, Mallory–Weiss syndrome, aortoenteric fistula, etc.), ruptured aortic aneurysm, superior mesenteric artery syndrome, etc. * Severe dehydration * Third spacing, e.g. malignant pleural effusion, ascites, severe peripheral oedema due to kidney failure * Rapid fluid shift due to dialysis * Cardiogenic shock * Myocardial infarction * Severe cardiac arrhythmia, e.g. ventricular fibrillation, sea water poisoning * Failed heart transplant or artificial heart; in those with cardiovascular disease who are just being treated with medical therapy or oxygen, pacing, cardioversion, or defibrillation using an implantable cardioverter-defibrillator, or else implantation of an intra-aortic balloon pump, or a unilateral or bilateral ventricular assist device, may help matters, as could the use of stenting and/or coronary artery bypass surgery and/or the removal of atherosclerotic plaques. Eventually, a heart transplant or artificial heart may be needed, and these can be replaced when they are no longer performing as well as they did. If necessary, while waiting for a transplant or device, extracorporeal membrane oxygenation (ECMO) or mechanical ventilation using a ventilator, or other less invasive methods, can be used to help compensate. If other systems get impaired, renal dialysis, liver dialysis, and artificial nutrition and hydration (including total or partial parenteral nutrition) can also be used. * Congenital heart defects * Obstructive shock * Pulmonary embolism * Cardiac tamponade * Aortic dissection * Tension pneumothorax * Hypertrophic cardiomyopathy * Constrictive pericarditis * Distributive shock * Septic shock * Anaphylactic shock * Acute pancreatitis * Hypotension due to medications * Intoxicative inhalants * Combined * Dengue fever
Circulatory collapse
Cardiovascular drift
Permissive hypotension
Vasodilatory shock
Parasympathetic rebound
Proarrhythmia
Ischemic cascade
Cerebral softening