CARDIO Flashcards
(451 cards)
What are the 3 ways to reduce blood pressure?
- Reduce Blood Volume (Diuretics)
- Reduce Systemic Vascular Resistance (Alpha Resistance)
- Reduce Cardiac Output (Beta Blockers)
What do Carbonic Anhydrase Inhibitors do?
They reduce reabsorption of bicarbonate in the PCT and are typically very weak diuretics.
An example is acetazolamide.
What do Loop Diuretics do?
They work in the kidneys and significantly block the reabsorption of sodium.
An example is Furosemide or Lasix.
What do Thiazide Diuretics do?
They work in the kidneys by mildly blocking reabsorption of sodium.
An example is HCTZ.
What do Potassium Sparing Diuretics do?
They work in the kidneys by manipulating sodium and potassium exchange or by blocking aldosterone, usually used in combination with Loop and Thiazide Diuretics.
What do Osmotic Diuretics do?
They work in the kidneys to decrease water reabsorption and are used mostly for reduction of intracranial pressure, increase urinary production of toxins, and promotion of urine production in acute kidney damage.
An example is Mannitol.
What is a Renin Inhibitor?
Aliskiren (not covered)
A medication that inhibits the binding of renin to angiotensinogen.
What are Angiotensin Converting Enzyme (ACE) Inhibitors?
Lisinopril, Captopril
Medications that block the conversion of Angiotensin I to Angiotensin II.
What are Angiotensin Receptor Blockers (ARB)?
Losartan
Medications that block the binding of Angiotensin II to Vascular (AT1) Receptors.
What is the mechanism of action of Renin Inhibitors?
Inhibits the binding of renin to angiotensinogen, elevates Bradykinin, reduces renal blood flow and risk of renal injury.
What are Alpha Blockers?
Prazosin, Terazosin, Doxazosin, Tamsulosin
Medications that decrease systemic vascular resistance.
What are Selective Beta Blockers?
Atenolol, Metoprolol
Medications that decrease cardiac output and systemic vascular resistance.
What are Non-Selective Beta Blockers?
Carvedilol, Labetalol, Propranolol
Medications that decrease cardiac output, systemic vascular resistance, Renin, Angiotensin II, and Aldosterone.
What are Dihydropyridines?
Medications include Amlodipine and Nicardipine.
What are Non-Dihydropyridines?
Medications include Diltiazem and Verapamil.
What is the mechanism of action for Dihydropyridines?
Inhibit calcium ion influx into vascular smooth muscle and myocardium, mainly affecting arterial vascular smooth muscle and lowering blood pressure by causing vasodilation.
What are the effects of Dihydropyridines on heart muscle?
Decrease L-type Calcium channels in heart muscle leading to decreased heart contractility, decreased heart rate, and decreased heart conduction.
What properties do Dihydropyridines have?
They have significant antiarrhythmic properties.
What are Centrally Acting Adrenergic Agents?
Medications include Clonidine and Methyldopa.
What is the mechanism of action for Centrally Acting Adrenergic Agents?
Block sympathetic activity in the brain, decreasing systemic vascular resistance and cardiac input.
What is cardiac output (CO)?
The amount of blood being put out to the peripheral vascular system in a minute.
What does inotropic refer to?
Contractility, which increases or decreases Ca 2+ ions and affects how hard the heart muscle squeezes.
What does chronotropic refer to?
Heart rate, modulated by the parasympathetic or sympathetic nervous system. Beta blockers are negative chronotropes.
What does dromotropic refer to?
Speed of conduction, mainly in the AV node, which pauses to allow for ventricle filling.