BPK 305 Lecture Notes - Lecture 17: Vasodilation, Idiopathy, Asystole
4 Nov 2017
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If a person normally has high bp/is an intense person (ex. Vasovagal syncope: presyncope, loss of vision, loss of hearing, sweating, nausea, muscle weakness, syncope, loss of consciousness, preceded by. Increased bp, progressive increased hr, unstable bp/hr, large vagal reflex. > decreased vascular resistance, decreased co: **syncope occurs immediately after tilt of body (tilt table test, does not involve baroreflex response. Orthostatic hypertension: due to autonomic failure (ex. Parkinson"s disease: fainting due to baroreflex not strong/sensitive enough to stop fainting. Eitology/causes: vasovagal syncope, most common cause of fainting, triggers. It is the blood pressure that affects cerebral perfusion and causes fainting: therefore pacemaker does not prevent the faint, need to control bp, not just hr, to stop fainting, pacemakers only control hr. Pathology: clinical definition = sustained bp > 140mmhg systolic over > 90mmhg diastolic, the risk of cardiovascular disease doubles with increments of 20 (systolic)
