Lecture 2- Cardiovascular Disease I Flashcards
what is the most common cause of premature death in the world
cardiovascular disease
patients frequently have _____ CVD
more than one
what are the types of CVD
- HTN
-atherosclerosis - angina pectoris
- CHF
- arrhthmias
-bacterial endocarditis
what does atherosclerosis lead to
coronary artery disease leading to infarction
what is bacterial endocarditis caused by
infection, inflammation and scarring
what is CHF
- dilated ventricles with weak muscles
- thickened myocardium
what is arrhythmia
uncoordinated electrical signals
what is valvular disease characterized by and what does it lead to
- stenotic and not capable of full closure for blood circulation
- leads to CHF
what are the conditions that are risk factors for CVD
- high BP
- high cholesterol
- diabetes
- rheumatic fever
- more than one CVD
why is high BP a risk factor for CVD
- stiffens vessels which reduces blood flow
- risk for stroke, kidney disease and dementia
why is diabetes a risk factor for CVD
unstable glucose levels affect healthy myocardium function; angiopathy
what are the behaviors that are risk factors for CVD
- unhealthy diet
- physical inactivity
- obesity
- too much alcohol
-tobacco use - stress
what constitutes an unhealthy diet in CVD risk factors
- carbs, fat, caffeine, sodium
why is physical inactivity a risk factor for CVD
poor circulation
why is obesity a risk factor for CVD
excess weight stresses heart function, HTN, CAD
why is too much alcohol a CVD risk factor
increases BP, arrythmias
why is tobacco use a CVD risk factor
increases HR, BP, CAD
what family history is a risk factor for CVD
- genetics
- becoming older
- ethnicity
what are predisposing etiologies for CVD
- congenital
- hypertension (positive CVD feedback cycle)
- ischemia (positive CVD feedback cycle)
- inflammation
what are the contributary anatomic abnormalities for CVD
- hypertrophy
- dilation
- valves
- regurgitation
- stenosis
what are the late stage physiologic changes in CVD
- arrhythmias
- heart failure
- ischemia
what stages do we treat in dentistry for CVD patients
class I or class II
what are some signs of CVD
- elevated BP
- irregular HR
- abnormal RR
- SOB
- prolonged bleeding
- surgical scars
- easy bruising
what are symptoms of CVD
patient is uncomfortbale in supine position
what are the dental treatments in the low level intervention category
- health/medical evaluation
- exams
- prophy
- radiographs
- optical oral scans
- alginate impressions
what are the dental treatments that fall in the moderate intervention category
- SRP
- simple restorative procedures on 1-2 teeth
- simple extractions on 1-2 teeth
-restorative impressions needing retractions and longer setting times
what dental procedures fall under high risk intervention cateogry
- complex restorative treatment on more than 2 teeth
- multiple extractions
- surgical extractions
- implant placement
- full arch impressions
- dental care under general anesthesia
what does the renin-angiotensin aldosterone system do
maintains physiologic BP when BP is low
describe primary HTN
- mutlifactorial, gene-environment
- 90-95% of cases
what are the causes of secondary HTN
- renal disease and renin-producing tumors
- endocrine
- cardiovascular
- neurologic
what endocrine disorders can cause secondary HTN
- adrenal
- exogenous hormones
- pregnancy
- pheochromocytoma
- thyroid
what neurologic disorders can cause secondary HTN
- psychogenic
- sleep apnea
- intracranial vascular pressure
- exogenous
what are the complications of HTN
- MI
-stroke - CAD
- peripheral artery disease
- heart failure
- retinopathy
- end stage renal disease
what is the number for normal BP
- less than 120/ less than 80
what is the number for elevated BP
120-129/less than 80
what is the number of hypertensive crisis
higher than 180 and or/ higher than 120
how many BP readings do you need to make a dx
more than 2 readings on 2 separate visits
what is BP measured by
determined by indirect measurement in the upper extremities with a BP cuff and stethoscope
cuff should encompass ___ of the circumference of the arm
80%
center of cuff over _____
brachial artery
white coat HTN elevates BP by
30mmHg
how are pregnant patients BP affected
greater than 10 mmHg increase in systolic BP
what is the risk of high BP in pregnant patietns
eclampsia
HTN goals depend on:
patient age and comorbidities
what is the normal goal for patients with HTN
between less than 130-149/80-90 mmHg
what BP is the cut off for tx at UMKC
greater than or equal to 180/110 mmHg
what do you do if a patient presents with BP greater than 180/110 and is symptomatic
ER
what are the lifestyle modifications for HTN
- diet - increase fruit intake, decrease sodium, increased potassium
- physical exercise/weight loss
- tobacco cessation and alcohol intake reduction
what is the daily limit for alcohol for men and women
no more than 4 for men and no more than 3 for women
what are the ACE inhibitor drugs and their side effects
- lisinopril
-captopril - angioedema, neutropenia/agranulocytosis, taste disturbances
what are the calcium channel blocker drugs and their side effects
- nifedipine, dilitazem
- gingival overgrowth, dry mouth, taste disturbances
what are the diuretic drugs and their side effects
- hydrochlorothiazide
- spironolactone
- hydrochlorothiazide, furosemide
- dry mouth
what are the alpha adrenergic blockers and their side effect
- methyldopa
- dry mouth
what are the beta adrenergic blockers and side effect
- atenolol, oxprenolol, practolol
- propranolol
- dry mouth, angioedema
what are the side effects of pharmacotherapy for HTN
- dry mouth
- burning mouth
- taste changes
- angioedema
- gingival hyperplasia
- lichenoid reactions
- lupus like lesions
what drugs cause dry mouth
anti adrenergic and diuretics
what drugs cause burning mouth
ACE inhibitors
what HTN drugs cause taste changes
antiadrenergics and ACE inhibitors
what HTN drugs cause angioedema
ACE inhibitors and ARB
what HTN drugs cause gingival hyperplasia
calcium channel blockers
what HTN drugs cause lichenoid reactions
thiazides, methyldopa, propranolol and labetalol
what HTN drugs cause lupus like lesions
hydralazine
what is the mechanism of action that causes pseudopockets in calcium channel blockers
stimulates fibroblasts
what are the types of questions you should ask your HTN patients
- physical activity
- hypertension history
- hypertension monitoring
what are the serioud potential complications of severe uncontrolled HTN
- stroke
- angina
- arrhythmia
- MI
what might increase a patients BP and lead to complications
stress, anxiety, and fear
what can be a complication of patients taking nonselective beta-blockers
use of vasoconstrictor can cause acute rise in BP
HTN patients may be sensitive to sudden position changes causing:
orthostatic hypotension
what are the dental considerations for the hypertensive patient
- pre-operative considerations
- intra-operative considerations
- post-operative considerations
- ability to tolerate care
-drug effects
what are the pre-operative considerations for the hypertensive patient
- reduce stress and anxiety
- may need oral and/or inhalation sedation
what are the intra-operative considerations from a HTN patient
- profound anesthesia!!
- limit epi to 2 carpules if taking a selective beta blocker- 2 carp rule
- dont use epi gingival retraction cord
what are the post operative considerations for HTN
- avoid macrolide antibiotics with calcium channel blocker because increase in CCB levels
- avoid long term use of NSAIDS such as more than 2 weeks
- stage 2, monitor BP during tx
- raise patient slowly after tx because of hypotension
what are the general guidelines for a medical consult letter
- make explicit to physician
- ask specific questions to the physician in relation to the current disease status of patient
- disease/patient risk factors- control and severity
- timing risk factors- elective and emergency
- procedure risk factors - invasive and non-invasive
risk category of dental treatment is proportional to:
time of procedure
how many times should you check BP with pt with HTN
- 3 readings at 5-10 min intervals : 2 automatic and 1 manual
what are the hypertension cardiac measures
- stress reduction protocol
- NO
- profound anesthesia
- cardiac epi dose = max 0.04 mg
- articaine for maxillary blocks and maxillary or mandibular infiltrations
- 2% lidocaine 1:100,000 epi for IANB
- 3% mepivacaine without epi for anesthesia
what is atherosclerosis and what categorizes it
- inflammatory disorder with accumulation of lipid plaque within the aterial walls
- thickened intima ( decreased arterial lumen)
- decreased O2
- decreased blood flow to the myocardium
what does atherosclerosis lead to
-stenosis
- angina
- MI
- ischemic stroke
- peripheral arterial disease
what are the main risk factors for atherosclerosis
depression
- family history of CVD
- insulin resistance
- DM
- hyperlipidemia
atherosclerotic plaques can lead to:
- ischemia
- thrombosis
what is the mechanism of atherosclerosis
- chronic endothelial injury
- endothelial dysfunction
- smooth muscle emigration from media to intima and macrophage activation
- macrophages and smooth muscle cells engulf lipid
- smooth muscle proliferation, collagen and other ECM deposition, extracellular lipid
what causes chronic endothelial injury in atherosclerosis
- hyperlipidemia
- HTN
- smoking
- homocysteine
- hemodynamic factors
- toxins
- viruses
- immune reactions
what happens in endothelial dysfunction in atherosclerosis
- increased permeability
- leukocyte adhesion
- monocyte adhesion and emigration
what are the associated symptoms of atherosclerosis
chest pain and angina
what are the complications of atherosclerosis
- unstable angina
- MI
- thrombosis
- embolism
- aneurysm
describe angina pectoris
- chest pain resultant from ischemic changes
- pain may radiate
- pain lasts 5-15 minutes
- vasodilation used to resolve angina
what pain is angina pectoris described as
- mid- chest pain described as aching, heavy, squeezing pressure or tightness
where may pain radiate in angina pectoris
shoulder, arms and jaw
if unstable angina, pain lasts :
may be more than 5-15 minutes
describe stable angina
- imbalanced cardiac perfusion
- stable symptoms, reproducible, predictable, consistent
- chest pain precipitated by physical activity/exertion
- resolves with cessation of activity
describe unstable angina
- disruption of atherosclerotic plaque
- possible partial thrombosis, embolism or vasospasm
- symptoms increasing
- chest pain at rest or with less intensive physical activity/exertion
what is MI
- irreversible coagulative necrosis of the myocardium
- lose normal conduction and contraction
- left ventricle MI is more common
what are the symptoms of MI
- similar to angina plus
-radiation features - severe substernal pain with SOB, profuse sweating, and loss of consciousness
does pain resolve in MI with vasodilators
no and pain is more prolonged
what is treated/reduced in the management of modifiable risk factors and associated disease for ischemic heart disease
- HTN
- angina
- stroke
- revascularization
- hyperlipidemia
what medications are used to treat angina
nitrates (nitroglycerin) with stable angina
what medications are used for stroke prevention
antiplatelet agents such as aspirin and clopidogrel
what surgeries are used in revascularization
- percutaneous transluminal coronary angioplasty with stening (PCI; stent)
- coronary artery bypass grafting (CABG)
what is the most common drug for hyperlipidemia
- HMG CoA reductase inhibitor
- statins
is antibiotic prophylaxis required for SBE
no
what should you know in the medical consult for all ischemic disease patients
- severity of the disease
- stability and cardiopulmonary reserve of the patient
- type and magnitude of the dental procedure
what questions do you ask for ischemic heart disease patients
- same as HTN and:
- have you had cardiac surgery
- have you ever had MI
- make sure you and/or patient have nitroglycerin on day of visit to use when applicable
- be aware of signs and symptoms of MI and be prepared for emergency
- no elective tx in patient with unstable angina or recent history of MI
- do you bruise easily
should you stop antiplatelet therapy with ischemic heart disease patients
no
when should you consider a drug holiday with physician consult in patients with ischemic heart disease
if extensive surgery
what is the protocol for recent MI less than 1 month ago
- urgent dental care only
- acute dental pain or infection
- consult with physician
- consider referral to specialized center
what is the protocol for a past MI greater than 1 month
- consider severity of cardiac status and comorbidities
- ejection fraction can measure the degree of heart failure
- consider appropriate management protocols
what does ejection fraction measure
- amount of blood that leaves the left ventricle after contraction
what ejection fraction classes are okay to treat in dental care
first two levels from 40-70%
what is the ideal stress reduction in stable angina or past MI
- no ischemic symptoms
- intermediate risk
- no other risk factors
what are the stress reduction protocol procedural precautions for ischemic heart disease
- short appointments in the morning
- pre-treatment vital signs
- availability of nitroglycerin
- oral sedation
- NO - oxygen sedation
- profound local anesthesia
- limit amount of vasoconstrictor
- avoid epinephrine-impregnated retraction cord
- effective post-operative pain control
what are the drug interactions and oral manifestations of ischemic heart disease
- HLD: statins - avoid CYP inhibitors such as fluconazole and clarithromycin
- limit epi
- limit NSAIDs
what is the SA node
- primary pacemaker
- regulates atrial function
- produces P wave - atrial depolarization
what is the AV node
- regulates atrial impulses entering ventricles
- slows conduction rate of SA generated impulses
what is the QRS complex
simultaneous depolarization of the ventricles
what is the T wave
repolarization of the ventricles
what is an arrhythmia
- disruption of the electrical impulse generation or conduction in the heart leads to abnormal cardiac function
what qualifies an arrhythmia
- formation of abnormal impulse
- increased impulse formation
- enhanced or abnormal impulse formation
- delayed depolarization
- re-excitation of the heart after refractory period
the disruption in arrythmias may be due to an area of:
- infarction
- ischemia
- electrolyte imbalance
- medication
what is the most common cause of sudden cardiac death
ventricular fibrillation
what are the causes of arrhythmias
- cardiovascular disorders
- pulmonary disorders
- autonomic disorder
- hyperthyroidism
- drugs
- electrolyte imbalance
- anxiety and anger
what CVD cause arrhythmias
- MI
- mitral stenosis
- valvular disease
- ischemic heart disease
- congestive heart failure
what pulmonary disorders cause arrhythmias
-pneumonia
- obstructive lung disease
what drugs can cause arrhythmiaas
- epi
- alcohol
- digitalis
- morphine
- beta blockers
- tricyclic antidepressants
what are the classes of common cardiac arrhythmias
- atrial tachycardias
- heart block
- ventricular arrhythmias
- long QT syndrome
what qualifies bradycardia
- less than 60 beats/min
what qualifies tachycardia
more than 100 beats/min
what are the symptoms of arrhythmais
- palpitations, fatigue
- dizziness, syncope, angina
- CHF
- SOB
- orthopnea
- peripheral edema
describe atrial fibrillation
- most common arrhythmia
- rapid uncontrolled atrial activity
- irregularly irregular rhythm
- risk of arterial clot formation - embolism and stroke
what is a heart block
-impulse is partially or completely blocked
- prolonged or no conduction
describe first degree, second degree and third degree heart block
- first degree: longer conduction time
- second degree: mobitz I (prolonged and no P wave) and mobitz II (repetitive and occasional sudden blocks w/o previous prolonged conduction time)
- third degree: no impulses- complete block
which degree of a heart block is an indication for a pace maker
third degree
describe ventricular arrhythmias
- premature ventricular complexes (PVCs)
- common
- abnormal QRS complex + pause
- increased risk of death if patients have underlying CVD
describe ventricular tachycardia
- if more than 3 consecutive PVC at 100 beats/min
- if lasts for more than 30 seconds, requires termination
- torsades de pointes- potentially life threateningde
describe ventricular flutter and fibrillation
-lethal
- consequence of ischemic heart disease
- cardiac contraction is not sequential, chaotic
what are the side effects of antiarrhthmics- sodium channel blockers
- bitter taste
-dry mouth - petechiae
- gingival bleeding
- oral ulcerations
- xerostomia
- dry mouth
- taste abberation
- metallic taste
what are the side effects of beta blockers for arrhythmias
taste changes and lechnoid reactions
what are the side effects for potassium channel blockers for arrhythmias
- taste abberation
- taste changes, lichenoid reaction
- angioedema
what are the side effects of calcium channel blockers for arrythmias
gingival overgrowths
what are the oral anticoagulants
- clopidogrel (Plavix)
- Aspirin
what is the low dose for baby aspirin
81 mg
what are the oral anticoagulatns
warfarin (Coumadin)
what are the direct oral anticoagulatns
- direct thrombin inhibtor
- direct factor Xa inhibitors
what are the drugs prescribed for arrhythmias
- clopidogrel
- aspirin
- oral anticoagulants
- direct oral anticoagulants
when should you stop anticoagulatns for dental tx
extensive surgery
why should you not stop anticoagulation unless neccessary
risk of thrombosis and risk of massive bleed
what are the non pharmacologic tx for arrhythmia
- pacemakers
- implant cardioverter- defribrillator
- surgery
- electrocardioversion and defribrillation
what are the surgeries for arrhythmia
- tissue resection
- cardiac ablation
- surgery to address underlying cause
what is the protocol for high risk arrhythmias
- defer elective dental care
- dental tx should be limited to urgent care only such as acute pain, bleeding or infection
- obtain medical consult
- management may include an IV line, pulse oximeter, BP and oxygen and ECG monitoring
- cautious use of epi
- prophylactic nitroglycerin
what is the protocol for intermediate and low risk arrhythmias
- stress/anxiety reduction
- assess pretreatment vital signs, have nitro available, limit epi
- profound local anesthesia and pain control
what is indicated with devices in arrhythmias
- electrosurgery units contraindicated in patient with pacemakers and ICDs
- ultrasonic scalers.- low risk interference
- battery operated curing lights - low risk interference
what type of interference is a concern in devices with arrythmias
electromagnetic
what are the local measures for hemostasis/bleeding
- gelatin sponges
- oxidized cellulose
- chitosan hemostatis products
- sutures
- gauze with applied pressure
- topical tranexamic acid
- topical amio=nocaproic acid
- topical thrombin
- electrocautery but not with pacemakers
when are local measure done to control bleeding
when the risk of a patient coming off their medication is too great