Cardiac Flashcards
Normal blood flow thru ♡
superior and inferior vena cava (deoxygenate blood) → RA → tricuspid valve → RV → pulmonary artery → lungs → pulmonary veins (oxygenated blood) → LA → mitral/bicuspid valve → LV → aorta → body systems
Preload
amount of blood returning to right side of heart and muscle stretch that the volume causes — (ANP released during stretch)
Afterload
• what is it?
• w/ HTN = more ____ = lead to what? because HIGH afterload = ↓ CO and ↓ forward flow (wears your heart out)
- pressure/”resistance” in aorta and peripheral arteries that LV has to pump against to get blood out
- HTN = more RESISTANCE = lead to HF and pulmonary edema (HIGH afterload = ↓ CO and ↓ forward flow — wears your heart out)
Stroke Volume
amount of blood pumped out of ventricles w/ each beat
Cardiac Output
• formula?
• ____ is dependent on adequate CO
• Cardiac output changes according to body’s ____
- CO = HR x SV
- Tissue perfusion
- body’s needs
Factors that affect Cardiac Output
• what 3 things? examples?
- HR and certain arrhythmias
- Blood volume
- -less volume = ↓ CO
- -more volume = ↑ CO - Decreased contractility
- -MI, meds, cardiac muscle disease
Patho of ↓ CO • will you perfuse properly? a. Brain: LOC? b. heart? c. lungs? d. skin? e. kidneys? f. peripheral pulses?
• ____ are no big deal UNTIL they affect your Cardiac Output
• NO
a. LOC ↓
b. chest pain
c. wet lung sounds; SOB
d. cold and clammy
e. UO ↓
f. weaker pulses
• Arrhythmias
3 Arrhythmias that are always a big deal
- V-fib
- Pulseless V-tach
- Asystole
Medications Effects on CO
Preload - vasodilate/diurese to ↓ preload
- Diuretics (furosemide)
2. Nitrates (nitroglycerin)
Medications Effects on CO
Afterload - vasodilate to ↓ afterload
- ACE inhibitors (enalapril, fosinopril, captopril)
- ARBs (losartan, irbesartan)
- Hydralazine
- Nitrates
Medications Effects on CO
Improve Contractility
- Inotropes (dopamine, dobutamine, milrinone)
Medications Effects on CO
Rate control
- Beta blockers (propranolol, metoprolol, atenolol, carvedilol)
- Calcium Channel Blockers (diltiazem, verapamil, amlodipine)
- Digoxin
Medications Effects on CO
Rhythm control
- Antiarrhythmics (Amiodarone)
Coronary Artery Disease (CAD)
• most common type of cardiovascular disease: broad term for _____ and _____
• chronic stable angina and acute coronary syndrome
Chronic Stable Angina Patho
- Intermittent ↓ blood flow to myocardium leads to? and then can lead to temporary what?
- what brings this pain? ____ O2 usually d/t ____
- What relieves the pain?
- ISCHEMIA; pain/pressure in chest
- LOW O2 d/t EXERTION
- rest and/or nitroglycerin SL
Nitroglycerin (Nitrostat): Sublingual • causes what? then causes ↓ \_\_\_\_ and \_\_\_\_; also causes what to increase blood flow to myocardium? • take 1 every \_\_\_\_ min x \_\_\_\_ doses • okay to swallow? • keep inside what? in what environment? • burn or fizz? • will get a what? • renew how often? spray? • after taking nitro, what to expect for BP to do?
- venous and arterial DILATION; ↓ PRELOAD and AFTERLOAD; also causes DILATION of CORONARY ARTERIES
- take 1 every 5 MINUTES x 3 DOSES
- DO NOT SWALLOW –needs to dissolve
- keep in DARK, GLASS BOTTLE; dry, cool
- burn or fizz –MAY OR MAY NOT HAPPEN
- will get a HEADACHE
- renew EVERY 6 MONTHS —-spray: 2 YEARS
- BP ↓
Algorithm for NItroglycerin
take 1 NTG SL –after 5 mins if chest pain/discomfort is unimproved/worsened – CALL 911!
Beta-Blockers for Prevention of Angina • examples? • what BBs do to BP, Pulse, myocardial contractility? • what BBs do to workload of heart? • what BBs block? • what happens to CO?
- propranolol (Inderal), metoprolol (Lopressor/Toprol XL), atenolol (Tenormin), carvedilol (Coreg)
- DECREASE BP, Pulse, myocardial contractility
- ↓ workload of heart
- block beta cells (receptor sites for catecholamines – epi, norepi)
- ↓ CO
Calcium Channel Blockers for Prevention of Angina • examples? • what CCB do to BP? • cause what in arterial system? • dilate \_\_\_\_ \_\_\_\_ • 2 benefits of CCB?
- nifedipine (Procardia XL), verapamil (Calan), amlodipine (Norvasc), diltiazem (Cardizem)
- ↓ BP
- vasodilation
- coronary arteries
- ↓ afterload and ↑ O2 to heart muscle
Acetylsalicylic acid (Aspirin) typical dose?
81 mg - 325 mg
Chronic Stable Angina Education • rest? • nutrition: avoid \_\_\_\_, eat what? • what to avoid that ↑ HR? • wait how long after eating to exercise? • what to wear in cold weather? why? • take \_\_\_\_ prophylactically • \_\_\_\_ cessation • lose \_\_\_\_ • avoid \_\_\_\_ exercise • reduce \_\_\_\_
- rest FREQUENTLY
- nutrition: avoid OVEREATING, eat LOW-FAT, HIGH FIBER
- EXCESS CAFFEINE OR ANY DRUGS that ↑ HR
- wait 2 HOURS after eating to exercise?
- DRESS WARMLY in cold weather? TEMP EXTREMES PRECIPITATE ATTACK
- take NITROGLYCERIN prophylactically
- SMOKING cessation
- lose WEIGHT
- avoid ISOMETRIC exercise (NO LIFTING WEIGHTS)
- reduce STRESS
Cardiac Catheterization Pre-procedure • ask if allergic to what? why? • check kidney function why? • what do PHP prescribe if client has kidney problems? why? what should the client expect when getting this?
- shellfish or iodine — iodine-based dye is used
- b/c dye is excreted thru kidneys
- acetylcysteine (Mucomyst) —helps protect kidneys — hot shot and palpitations
Cardiac Catheterization Post-procedure • monitor \_\_\_\_ • watch puncture site for what? • assess 5 Ps? • bed rest, flat, extremity straight for how many hours? • report \_\_\_\_ ASAP • IF client is on metformin (Glucophage) -- what to do with this med post procedure? we are worried of what?
- monitor VS
- bleeding and hematoma formation
- Pulselessness, Pallor, Pain, Paresthesia, Paralysis
- 4-6 hours
- Pain
- hold metformin for 48 hours post procedure — worried about kidneys
Unstable chronic angina = Impending ______
MI
Acute Coronary Syndrome/MI/Unstable Angina
PATHO
• Decreased blood flow to ____ → ____ and ____
• does the client have to be doing anything to bring this pain on?
• will rest or nitroglycerin (Nitrostat) relieve this pain?
- Decreased blood flow to MYOCARDIUM → ISCHEMIA and NECROSIS
- no
- no
Acute Coronary Syndrome/MI/Unstable Angina S/SX • pain described as? • women present with what s/sx? • #1 sign of MI in elderly? • skin? BP? • CO? • ECG changes? • Vomiting?
- pain as CRUSHING, elephant sitting on chest, pressure radiating to left arm and left jaw, N/V, pain between shoulder blades
- women - GI s/sx – epigastric discomfort, pain between shoulders, aching jaw or choking sensation
- SOB
- cold and clammy; BP ↓
- CO ↓
- ECG changes –lots of PVCs
- Yes, stimulation of vagus nerve
Triad of Symptoms in Women
- indigestion or feeling of fullness
- unsual fatigue
- inability to catch one’s breath
STEMI?
NSTEMI?
***WORRY ABOUT WHICH CLIENT?
STEMI
– ST-segment elevation MI – client is having a HEART ATTACK – goal is to get client to cath lab for PCI in <90 minutes!!
STEMI
Non-ST segment elevation MI – less worrisome
WORRY ABOUT STEMI CLIENT
MI Lab work - CPK-MB • Cardiac specific \_\_\_\_ • \_\_\_\_ w/ damage to cardiac cells • elevates within \_\_\_\_ hours; peaks in \_\_\_\_ hours
- TROPONIN
• ____ specificity to myocardial damage
• elevates within ____ hours; remains elevated up to ____ weeks - MYOGLOBIN
• Increases within ____ hour; peaks in ____ hours
• ____ results are a good thing - which cardiac biomarker is the most sensitive indicator for an MI?
- which enzymes or biomarkers are most helpful when the client delays seeking care?
- biomarker
- INCREASE
- elevates within 3-6 HOURS —- peak: 12-24 HOURS
- HIGHLY specific cardiac biomarker
- elevates within 3-4 HOURS — elevates up to 3 WEEKS
- 1 HOUR; peak: 12 HOURS
- negative
- troponin
- troponin
MAJOR ARRHYTHMIAS
• what untreated arrhythmias will put client at risk for SUDDEN DEATH?
- tx for V-Fib?
- if defib doesn’t work, what’s 1 st med or vasopressor to give?
- what’s an antiarrhythmic and is used when V-fib and pulseless VT are resistant to treatment, also for fast arrhythmias
- antiarrhythmic drugs given to prevent a second episode of V-fib?
- Lidocaine toxicity: any ____ changes
- 1sst antiarrhythmic of choice? important SE? why?
• Pulseless V-tach, V-Fib, Asystole
- Defibrillation “Defib the V-fib!”
- EPI
- amiodarone (Cordarone)
- Amiodarone or Lidocaine
- NEURO changes
- amiodarone (Cordarone); hypotension; lead to further arrhythmias