Cardiovascular system part 2 Flashcards
Cardiac Evaluation- How well is this patients heart working?
-Past medical history
-general medical health
-physical evaluation
-ECG
-Type of sx planned
Role of Medical Consultant- Good communication essential
-Medical clearance prior to sx
-Review available patient data, history, and his/her examination
-Communicate severity and stability of the patients cardiovascular status- and vet clearance in writing / faxed
-determine if patient is in optimal medical condition, given context of surgical illness
Diseases of the cardiovascular system
“Cardio”
-Angina (chest pain)
-Myocardial infarction (MI- heart attack)
-Congestive heart failure (CHF)
-Valve damage
-cardiac dysrhythmias
“Vascular”
-Hypertension (high BP)
-Low BP
-cerebrovascular accident (CVA- Stroke)
What parts of “cardio” leads to what diseases (plumbing pump circuitry)
- The Plumbing: Diseases of the coronary arteries leads to angina pectoris
- The pump: Diseases of the myocardium and valves leads to congestive heart failure (CHF) and valve damage and malfunction
- The Circuitry: Diseases of the conducting system leads to irregular heart beats- dysrhythmias
Cardiac diseases- Ischemic heart disease
-Definition: Ischemia is a restriction in blood supply, generally due to partial or complete occlusion of the blood vessels, with resultant damage or dysfunction of tissue.
-Insufficient blood flow to heart muscle from narrowing of coronary artery may cause chest pain, narrowing caused by plaque in coronary artery
Classification of Ischemic Heart disease usually results in __ and this encompasses ___ and ___.
classification of ischemic heart disease usually results in acute coronary syndrome and this encompasses angina pectoris and myocardial infarction
Acute coronary syndrome sequence of disease
-early plaque begins. plaque is made up of fat cholesterol calcium and other substances found in blood
-significant plaque begins to partially occlude arteries walls. when plaque partially occludes blood flow to muscle result is angina
-thrombus- plaque beginning to rupture. Plaque can crack off which causes blood clot
-Infarction- thrombus totally occludes coronary artery blocking blood flow
-results in death/necrosis of muscle/results in heart attack (MI)
Angina pectoris definition
Definition: A primary symptom of coronary heart disease which occurs when myocardial oxygen demand exceeds supply.
-chest pain that occurs in coronary heart disease caused by inadequate oxygenation of cardiac muscle
Angina pectoris
-crushing substernal pain (under sternum/middle chest)
-pain radiating to jaw, arm, back
-caused by ischemia (lack of blood supply to heart)
-if ischemia is relieved and blood supply is restored, angina should resolve
angina - pathophysiology
-starts in coronary arteries by build up of plaque
-available space for blood to flow is narrowed
angina pectoris- diagnosis
diagnosis- history
-when was the last attack?
-how frequently do the attacks occur?
-what exercise level leads to the attacks?
-angina pectoris associated with pain during g exertion
Acute coronary syndrome - treatment
-early plaque + significant plaque= angina
-tx is focused on restoring oxygen to heart muscle remember MONA
-Morphine is given to relive pain
-Oxygen is given to minimize O2 delivered
-Nitroglycerin is a med that dilates arteries to increase blood flow to heart
-Aspirin is given to thin blood
Angina pectoris - treatment
If Angina occurred during intraoperatory treatment would be to
-terminate surgery
-suction, pack surgical site
-100% O2 by mask
-semi recumbent positio.
-loosen clothing
-nitroglycerin sublingually (tablet or spray)
-monitors (BP, HR, EKG, Pulse Ox)
-Nitroglycerin 2nd and 3rd dose q 5 min prn
- If no relief after 3rd dose assume MI and call 911
Myocardial Infarction - the second component of the acute coronary syndrome
Definition: Necrosis or death of heart muscle precipitated by decreased oxygenation from partial or complete blockage of blood flow in the coronary arteries
- Area of infarction with death of the myocardial tissue
Myocardial infarction signs and symptoms
-crushing chest pain not relieved by nitroglycerin
-pain radiating to the arm shoulder or jaw
-sweating, pallor (pale)
Myocardial Infarction vs angina
Heart attack vs coronary
MI is irreversible with cell death
Angina is an injury
Angina is deprived of oxygen- injured but reversible event. restoration of blood flow and oxygen will resolve pain.
Radiation of chest pain in myocardial infarction (MI)
Just as in angina..
-pain may radiate to jaw, shoulder, arm
-jaw pain my be mistaken for tooth pain
Myocardial infarction- diagnosis
-weakness, anxiety, and feeling of impending doom
-crushing chest pain but no response to NTG
-Cardiac dysrhythmias
-Hypotension
-systemic symptoms: nausea/vomiting, pallor (pale), Diaphoresis (sweaty)
Thrombus
-partially restricted blood flow due to plaque in arterial wall
-if plaque ruptures then thrombus forms and may grow and occlude the vessel, thrombus detaches causing embolism obstructing blood flow through artery
-supply of blood obstructed=MI cells ischemic resulting in damage to heart muscle
-Coronary arteries supply constantly alive heart muscle with blood
-MI symptoms: short breath, tightness in chest, intense prolongs chest pain, nausea, fainting, sweating, pain in left shoulder arm jaw and back
Myocardial infarction is induced by and caused by what
-induced by exercise, emotion, heavy meal, stress, surgery
-caused by inadequate coronary circulation leading to permanent muscle damage
Medications used to manage ischemic heart disease
-Remember sympathetic nervous system
-Beta blockers- decrease myocardial oxygen requirements (atenolol, lopressor) lowers blood pressure and heart rate
-Nitrates- vasodilation (nitroglycerin) side effect of a headache
-calcium channel blockers- reduction in cardiac contractility (Adalat, procardia)
-Aspirin- reduction of clumping of blood platelets which can lead to clot formation
-Lipid-lowering drugs- reduce plaque formation (lipitor)
Treatment considerations for patients with a history of Myocardial Infarction
-oxygen during the procedure
-stress reduction
-sedation
Anesthetic considerations and intraoperative management
-for minimally invasive procedures normally performed in an office setting, moderate (“conscious”) sedation may be considered for a patient with significant history of cardiovascular disease
-for more complex procedures requiring general anesthesia, consider an operating room with an anesthesiologist monitoring the patient
Myocardial infarction treatment
MONA (Morphine, Oxygen, Nitroglycerin, Aspirin)
When MI suspected call 911 at outset and be prepared to transfer care to EMTs