Antihypertensives Pt. I Flashcards
Hypertension Background
• 46% of all Americans have BP ≥____
• 38% of Caucasians, 57% of ____
• >60% of all individuals over the age of ____
• Generally asymptomatic until end organ damage
• Only 50% of population getting treated and only 50% of these have BP under optimal control
• BP guidelines have changed ○ Used to be 140/90 ○ Now it's 130/80 - throws more people into the hypertensive group • More prevalent in AA • Side effects are an extension of their mechanism of action
130/80
AA
60
End Organ Consequences • Accelerated \_\_\_\_ • Renal damage especially \_\_\_\_ • Increased risk of bleeding \_\_\_\_ • Increased risk of aneurysm \_\_\_\_ • Increased risk of \_\_\_\_ (ventricular hypertrophy) • Increased risk of \_\_\_\_
• Untreated hypertension ○ Accelerated CAD § Angina pectoris > heart attacks • Renal damage ○ Proteinuria, reduce GMF (by measuring \_\_\_\_ [measure the amount in the blood, and based on weight/height]) • Bleeding stroke > brain damage • Congenital aneurysms are more likely to burst • Constant high BP puts heart on overload > pumping of heart begins to fail • Microbleeds can occur in eye > retinopathy (damages nerves and lose eyesight)
coronary artery disease diabetics strokes rupture aneurysm rupture retinopathy
creatine clearance
Risk factors
Unavoidable • \_\_\_\_ • Increased age • \_\_\_\_ • AfricanAmerican • \_\_\_\_
Modifiable • \_\_\_\_ • Obesity • \_\_\_\_ • Smoking • \_\_\_\_
• Nicotine stimulates nicotinic receptors in the ganglia > drive \_\_\_\_ nervous system • Exercise shown to reduce BP (not just stress, but also physiologic) ○ Cholesterol increases because the body increases \_\_\_\_ ○ Kidney function decreases
genetics male gender diabetes sodium intake alcohol intake exercise sympathetic LDL
Management
• MAP= CO x PVR
– CO ~ preload, heart rate, contraction force
– PVR ~ blood vessel diameter and stiffness
• So treatment strategies are:
– Slow/reduce ____ of the pump (the heart)
– Decrease ____ volume
– Open ____ (blood vessels)
– Decrease ____ activity to pump and pipes
• Manage high BP > lower renal arterial pressure • Drugs reduce CO ○ Reduce amount of blood pumped by heart • Slow/reduce force of heart - \_\_\_\_ • Dec plasma volume - \_\_\_\_ • Open pipes - \_\_\_\_ blocking agents (-azosin) • Decrease CNS activity ○ Problem: going to get CNS depressant effects (drowsy, lethargic)
force
plasma
pumps
CNS
beta blockers
diuretics
alpha1
• Centrally acting
○ Decrease sympathetic outflow
• Drugs are either ____ (decreases neurotransmitter release), or they deplete neurotransmitter (reduce activity at ganglionic sites; ____ - problem: the ganglia are the nerve cell bodies of the post ganglionic nerve fibers of both the sym and parasymp NS - can block sym, but can get side effects that blunt parasymp; powerful drugs, not on them for long periods of time - like in hospital to get the BP down really quickly [like ____ bursting in head]
• Deplete NT in periphery - adrenergic neuronal depleting agents
○ Work on nerves innervating BV or heart
§ Reduce amount of NE in nerve terms of symp system
• Work directly on receptors
○ Beta adrenergic blocking agents
§ Action not just on heart, but a ____ blunting effect; in the kidney (has beta receptors) and stimulation of the receptors enhances production of renin > stimulators of the RAT pathway > end product: ____ - vasoconstrictor, enhance secretion of aldosterone from adrenal cortex (water/sodium retention), stimulate NS centrally
Jacking up system can increase BP
alpha2 agonists
ganglionic blockers
vessel
CNS
angiotensin II
• At level of kidney: ____
• ACE inhibitors work on this sytem
○ Block conversion of ____ (10 to 8 AA)
○ All these drugs (ACE) end in -pril
○ Blocking ACE is a problem > development of drugs that block angio II receptors (-sartin)
§ On BV, in adrenal cortex
§ Similar effect to ACE inhibitors
§ Doesn’t do one, which may make them weaker but reduces potential side effects
• Alpha adrenergic antagonist
○ ____ - you want to block alpha 1 (blocking alpha 2 - increased NE release > makes heart start racing [____])
• Ca-channel blockers
○ Two classes: -pine (lodapine, nifedipine) - block Ca on ____ (vasodilation); virapapil block Ca channels in ____ > will vasodilate, but will also ____ the heart down
○ Implicated in the development of ____
• Vasodilators
○ Direct acting on ____
○ Some open ____ channels
○ Some enhance ____ pathway (vasodilators)
diuretics angio I to angio II vasodilate reflex tachycardia BV heart slow gingival hyperplasia BV K+ NO/cyclic GMP
Centrally Acting Antihypertensives 1
• Clonidine (Catapres®)
– ____
– decreases ____ sympathetic outflow to heart and blood vessels
• Decreased CO and PVR lowers BP
• Also useful in treating some excessive sympathetic nervous systems symptoms of ____ from CNS depressants
• Has some utility in management of ____ pain – sympathetically maintained pain
• Not used for hypertension anymore - too many \_\_\_\_ ○ Depresses CNS too much > people are too lethargic ○ Added on when \_\_\_\_ drugs and still not in an acceptable range • Not directly working on the organs, but slowing down things that come out of the CNS that innervate these organs • When people are withdrawing from CNS depressants (opposite of the activity of the drug): ○ Dampen down the symptoms • Utility in management of chronic pain: ○ Chronic oral facial pain - \_\_\_\_, sympathetically maintained pain § Abnormal crosstalk between symp and neurons that send pain signals to brain/spinal cord § May be due to nerve crushing injury, and they may try to reconnect resulting in abnormal connections
alpha2 adrenergic agonist
CNS
withdrawal
chronic
side effects
2/3
reflex sympathetic dystrophy
Centrally Acting Antihypertensives 2
• α-methyldopa (Aldomet®)
– Crosses ____and metabolized to α methyldopamine > ____
– α methylnorepinephrine a pure ____ agonist or so called “____”.
• Both clonidine and α methyldopa produce the following AEs: Sedation, ____ (apparently α 2 receptors on postganglionic parasympathetic neurons to salivary glands)
A-methyldopa
• False transmitter
• Not widely used > dampens the CNS
• Decreased ____ release in the CNS (like clonidine)
○ Dampens nerve activity going to the BV in the heart
• Xerostomia
○ Dampening symp, but it implies ____ is dominating
○ In salivary glands and the nerves that innervate > have a2 receptors > stimualted > decrease release of Ach to the glands
BBB alpha methylnorepinephrine a2 false transmitter xerostomia NT para
Ganglionic Blocking Agents
• Mecamylamine (Inversine®), Trimethaphan (Afronad®)
– Block ____ receptor on ganglia so some blockade of both ____ nervous systems
– Decrease PVR and CO
– Reserved for ____
– AEs typically reflect a blockade of the system that predominates in that organ:
• Severe ____, bradycardia on sympathetic side
• ____, constipation on parasympathetic side
• Block connection bt pregang and postgang nerve fibers ○ Hitting cell bodies on postgang nerve fiber ○ Hit symp and parasymp • Hit nerves that go to heart and to the BV ○ Decrease CO and PVR • Very powerful - only used in \_\_\_\_ ○ Not used long term > gets the BP rapidly down • AE: ○ On sympathetic side: § Blockade of the sympathetic nervous system - slow HR, dropping the BP too low ○ On parasympathetic side: § Salivary tissue, GI tissue > at rest predominates > on these drugs for a while > xerostomia and constipation ○ These are unpredictable
nicotinic N cholinergic sympathetic and parasympathetic hypertensive crisis hypotension xerostomia hospital settings
Adrenergic Neuronal Blocking Agents
• Guanethidine (Ismelin®) and Reserpine (Serpasil®).
– Causes slow depletion of ____ from postganglionic adrenergic nerve terminal
– Guanethidine competes for NE ____
– Reserpine blocks NE ____ into vesicles
– Drugs will decrease PVR and CO
– Reserpine enters ____ readily and depletes NE there also increasing risk of depression
– Both drugs cause lots of ____ and stomach cramping and diarrhea
– Theoretically up-regulate ____
• These drugs are working at nerve terminals that innervate BV and cardiac tissue ○ Slowly deplete NT: § Slow leaking out § Competition for the NE for getting into the vesicles □ If NE is synthesized and cannot get into the vesicles in the nerve terminal > it cannot be spit out during an AP • Guanethidine - totally excluded from \_\_\_\_; reserpine readily gets in ○ Tragic discovery: reserpine was used for high BP, and 10-15% would get very depressed on these drugs; drugs were created afterwards to create drugs that bumped on NE; the discovery of depression • Depleting NT at the BV > profound vasodilatory effect > \_\_\_\_ • Make the PNS predominate > stomach cramping and diarrhea • Body compensates > upregulates alpha and beta receptors ○ Cautionary: increasing \_\_\_\_ in locals for dentistry can add to this problem
norepinephrine reuptake entry CNS orthostatic hypotension alpha and beta receptors
CNS
postural hypotension
epi
Some Drugs Affecting BV
VASODILATORS • Alpha antagonists ○ Alpha1 selective - ends in \_\_\_\_ • Ca++ blocking agents ○ Two ways to cause vasodilation: § Block positive from \_\_\_\_ § \_\_\_\_ positive ions going out ○ Pure vasodilator (dihydropyridines): end in pine ○ The other two also slow the \_\_\_\_ down (diltiazem and verapamil) • K+ agents ○ Open them (\_\_\_\_) ○ Not widely used; used in emergencies ○ Major AE of minoxidil: used as an ointment (rhogaine) Taking pills for BP > \_\_\_\_
-azosin going in accelerate heart agonist hypertrichosis
Some Drugs Affecting BV
VASODILATORS
• Activator of NO/cyclic GMP system
○ NO enhances ____ and increase production of cGMP > vasodilation
○ NG mainly used in an acute ____
• Angiotensin II antagonists
○ End in ____
○ Not just vasodilators > blcok ang II receptors throughout the body
§ Not as powerful as other agents > well ____
§ Reduce aldosterone secretion from adrenal cortext > less ____ retention
§ Blunting peripherally of the symp
guanylate cyclase angina attack -sartan tolerated water/sodium
Non-Selective α Adrenergic Blockers
• Phentolamine (Regitine®, Oraverse®), phenoxybenzamine (Dibenzyline®)
• High incidence of ____ and reflex tachycardia (α 1, α 2 blockade)
• Phentolamine still used for ____, ____ diagnosis and most recently in small dose accelerating soft tissue local ____
• Block both alpha1 and alpha2 > lower BP • On first doses > postural hypotension because they vasodilate ○ Body turns on reflex mechanisms and speeds up the heart > reflex tachycardia; more likely to happen to these because they block alpha2; release of NE at the heart at b1 receptors > begins to drive the heart in addition to the response of vasodilation • Phentolamine is the active ingredient in oraverse ○ Doesn't use in local anesthetic overdose; just make the lip/tongue numbness go away quicker ○ Have to inject it in area with the local • Pheochromocytoma ○ [???] ○ Cure: \_\_\_\_ remove it ○ Phentolamine given IV in the diagnosis; if reverse the BP surge then they do imaging studies in order to confirm that there is a pheo there
postural hypotension hypertensive crisis pheochromocytoma anesthetic recovery surgically
Quality of Life Issues Associated with Prolonged Lip and Tongue Numbness • In adults/teenagers - difficulty \_\_\_\_ And everyone’s favorite: Speaking Drinking/Eating Drooling
• Opposing epi > making the local distribute quicker > \_\_\_\_ up the vessels ○ Lidocaine by itself would only last \_\_\_\_ mins for the tongue; with epi you now have pulpal anesthesia of \_\_\_\_ minutes
smiling
opens
5-10
60-90
In Pediatric Dental Patients Also:
Lip, Tongue and Cheek ____
biting/mutilation
