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100 Cards in this Set
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Alternative Agents for HTN
Key Point |
Alternative antihypertensive agents have not been proved to reduce the risk of CV events
compared with first-line antihypertensive agents. They should be used primarily in combination with first-line agents to provide additional BP lowering. |
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Characteristics of Alternative HTN Agents
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• Most have a high risk of side effects
• Reserved for difficult to control patients as last-line agents • Use only in combination with other agents • Are very inexpensive, except aliskiren • Most are dosed several times daily • Do not have outcomes data showing ↓ hypertension-associated complications |
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Alpha 1 Blockers
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Doxazosin(cardura)
Prazosin(Minipress) Terazosin(Hytrin) 1st dose should be given at bedtime; counsel patients to rise from a sitting/laying position slowly to minimize risk of orthostatic hypotension; have additional benefits in men with BPH *stopped early in ALLHAT trial b/c not as effective long term as ACE, thiazide, CCB |
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Direct Renin Inhibitor
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Aliskiren(Tekturna)
May cause hyperkalemia in patients w/ CKD and diabetes or those receiving K-sparing diuretic, aldosterone antagonist, ACE inhibitor, or ARB; may cause acute kidney failure in pts. w/ sever bilateral renal artery stenosis or severe stenosis in artery to solitary kidney; do NOT use in pregnancy |
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Central Alpha 2 agonist
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clonidine(catapres/TTS)
methyldopa(aldomet) Abrupt discontinuation may cause rebound HTN; most effective if used w/ diuretic to diminish fluid retention, clonidine patch is replaced once/wk and not rec. in elderly |
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Peripheral adrenergic antagonist
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reserpine(generic only)
very useful agent used in many major clinical trials; should be used w/ diuretic to diminish fluid retention |
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Direct Arterial Vasodilators
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Minoxidil(Loniten)
Hydralazine(apresoline) Should be used w/ diuretic and beta blocker to diminish fluid retention and reflex tachycardia |
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Resistant HTN Key Point
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Patients have resistant hypertension when they fail to attain goal BP values while
adherent with an appropriate three drug regimen. This three drug regimen must include full doses and include a diuretic. |
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What Defines Patients with Resistant HTN?
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Patient requiring 4 or more antihypertensive agents to treat hypertension,
even if they are at their goal BP - Patients not at their goal BP on 3 or more antihypertensive agents, at full doses, one of which is a diuretic |
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Patient Characteristics associated with resistant HTN
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o Older age
o High baseline blood pressure o Obesity o Excessive dietary salt ingestion o Chronic kidney disease(a lot of renin secretion) o Diabetes o Left ventricular hypertrophy(LV thickens, overburdened, early marker of HTN damage) o Black race(increased risk to not responding to HTN drugs) o Female sex o Residence in southeastern United States(lifestyle) |
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Causes of Resistant HTN
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1. Improper BP measurement
- excess sodium intake - vol. retention from CKD - inadequate diuretic therapy 2. Drug-induced/other causes - nonadherence - inadequate doses - agents from table 15-1, secondary causes of HTN (ex. NSAIDS) 3. Associated conditions - obesity, excess alcohol intake, sleep apnea 4. Secondary HTN ***Evolving data indicate that may patients have some degree of underlying hyperaldosteronism, emphasizing the role of adding an aldosterone antagonist (e.g., spironolactone) in resistant hypertension |
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Pharmacotherapy for Resistant HTN
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1. Assure Diuretic therapy
2. appropriate use of combo therapy 3. know when to use alternative agents |
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Thiazides as drug therapy for Resistant HTN
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Thiazides have a large role as part of the regimen
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Aldosterone Antagonist Diuretic Drug Therapy for resistant HTN
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- An aldosterone antagonist as an add-on agent is highly effective
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Loop Diuretic Therapy for resistant HTN
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- Consider using a loop diuretic in patients with resistant hypertension that
have very compromised kidney function (CrCl < 30 ml/min) |
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When to use alternative agents for resistant HTN
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- Never in place of recommended antihypertensive therapy in patients with
a compelling indication - After the first line options (ACE inhibitor, ARB, CCB, thiazide) and even after beta-blockers have been tried (or are contraindicated or not able to be used for whatever reason) |
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Why Teach Pharmacists About Nutrition?
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Obesity is the Greatest Risk Factor for:
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CVD Prevalence
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Medical Complications of Obesity
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1. Pulmonary disease
abnormal function obstructive sleep apnea hypoventilation syndrome 2. Nonalcoholic fatty liver disease steatosis steatohepatitis cirrhosis 3. Coronary heart disease Diabetes Dyslipidemia Hypertension 4. Gynecologic abnormalities abnormal menses infertility polycystic ovarian syndrome 5. Osteoarthritis 6. Skin 7. Gall bladder disease 8. Cancer breast, uterus, cervix colon, esophagus, pancreas kidney, prostate 9. Phlebitis venous stasis 10. Gout 11. Idiopathic intracranial hypertension 12. Stroke 13. Cataracts 14. Severe pancreatitis |
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Why Does Increased Fat Mass Increase
Chronic Disease Risk? |
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“Fat” Fat Cells and Hypertension
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Diet-Related Lifestyle Modifications That
Effectively Lower BP |
Moderation of Alcohol Intake : <2 drinks/d for men; <1 for
women Increased Potassium Intake: 120 mmol/d (4.7g/d) level provided in DASH Diet DASH-TYPE Dietary Patterns: Consume diet rich in fruits & veg (8-10 servings/day), LF dairy (2-3 servings/d), reduced sat fat and cholesterol Reduce Salt Intake: <1.5 grams/day sodium Weight Loss: BMI <25 kg/m2 |
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Lifestyle Modification
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Weight reduction: 5–20 mmHg/10 kg weight loss
Adopt DASH eating plan: 8–14 mmHg Dietary sodium reduction: 2–8 mmHg Physical activity: 4–9 mmHg Moderation of alcohol consumption: 2–4 mmHg |
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Weight Loss
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Dietary Approaches to Stop
Hypertension (DASH) Trial |
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DASH + Sodium Restriction
Trial |
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Free-Living Study on DASH Diet,
BP and Wt Loss |
|
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Increased Potassium Intake
(through DASH-Like Diet) |
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Moderate Alcohol Intake
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How vegetarian Diets effect BP
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– Have been associated with lower BP
– Some of the lowest BPs in industrialized countries are from strict vegetarians. |
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how fish oil effects BP
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Several small clinical trials have shown that high doses of omega-3
fatty acids can lower BP |
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how fiber effects BP
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Supplemental fiber of 14g/d showed BP reductions of 1.6 & 2.0 mm
HG |
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How Ca and Mg effect BP
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– Research has shown modest reduction in BP
with dietary calcium intake. – Best data with women with preeclampsia – Magnesium data inconsistent |
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How carbohydrates effect BP
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– Amount and type of CHO may affect BP
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Points of Concern to think of during HTN URGENCY cases
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1. Current medications
a. Appropriateness b. Dosing c. Cost 2. Patient presentation 3. Plan of action, including follow-up and monitoring |
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HTN Crisis Defn:
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• Critically elevated blood pressure (BP). Has been defined by different parameters
over time and most authors identify diastolic blood pressure (DBP) as the primary factor in diagnosis o DBP > 110-120 mmHg AND/OR o Systolic blood pressure (SBP) > 179 mmHg • Occurs in < 1% of all hypertensive patients • Major risk factor for hypertensive crisis is a history of stage 2 hypertension ***These are fairly loose definitions and require evaluation of the full clinical picture*** |
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4 Main Causes of HTN Crisis:
List |
1. Idiopathic
2. Medication non-adherence 3. undiagnosed HTN 4. Drug Induced |
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Main Causes of HTN Crisis:
Idiopathic |
Idiopathic – the rise in blood pressure could have no underlying reason behind it.
Just as HTN can occur in various types of patients, so can hypertensive crisis. |
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Main Causes of HTN Crisis:
Medication Non-adherence |
Medication non-adherence – the MOST COMMON reason for hypertensive crisis.
Typically occurs in patients with diagnosed stage 2 hypertension. Can also occur when patients abruptly stop certain agents (beta blockers, centrally acting agents) |
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Main Causes of HTN Crisis:
Undiagnosed HTN |
Undiagnosed hypertension – about 73 million people in the U.S. are estimated to
have hypertension, about 25% them are unaware, 63% are uncontrolled |
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Main Causes of HTN Crisis:
Drug Induced |
Drug induced – typically stimulant type illicit drugs (cocaine, methamphetamines,
phencyclidine hydrochloride (PCP), lysergic acid diethylamide (LSD)) |
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Other Causes of HTN Crisis
(Besides Top 4 causes) |
- Neuro: stroke, head injury
- Endocrine: hyperthyroidism, pheochromocytoma - Obstetric: eclampsia, preeclampsia - Cardiovascular: MI, aortic dissection, volume overload - Renal: acute glomerulonephritis, epogen use |
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Two Types of HTN Crisis:
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1. HTN Urgency
2. HTN Emergency |
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HTN Urgency
characteristics |
*** W/out immediate/ progressive end-organ damage
- Recommend lowering blood pressure within the next 24 hours - Managed by oral agents via a few options - Rapid (but safe) onset medications - Adjusting current medications - Adding on another long acting therapy |
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HTN Emergency
characteristics |
*** w/ current/progressive end organ damage
- Requires immediate BP reduction, but not to normal values - Initially treated with an appropriate parenteral drug Ex (FYI): hypertensive encephalopathy, intracranial hemorrhage, unstable angina, acute myocardial infarction, acute LV failure with pulmonary edema, dissecting aortic aneurysm, stroke, progressive renal failure, or eclampsia (in pregnancy) |
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What should you ALWAYS assess for in HTN Urgency?
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ALWAYS asses for end organ damage
Heart, brain, kidneys, and eyes (Think about the risks of long-term hypertension) What questions to ask? |
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Signs of end organ damage in..
brain, eyes, heart and kidney what do these signs mean? |
Brain: HA, mental status change
eyes: vision change, blurred vision heart: chest pain, N/V Kidney: increase freq. urinatino These signs constitute EMERGENCY and pt. needs IMMEDIATE medical attn. |
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HTN urgency goal:
|
GOAL: decrease BP gradually over 24 hours
o Avoiding excessive/abrupt reductions in BP is advised because this can precipitate renal, cerebral, and coronary ischemia o Adaptive autoregulatory mechanisms of essential organs |
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How do you interpret the "Cerebral Blood Flow vs. MAP" curve on pg. 3 in the notes?
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Cerebral BF remains constant over a large range of MAP(~50-150mmHg)
Patients w/ chronic HTN have a shift in the curve to the right(~125-200mmHg) If decrease BP too quickly/try to "normalize" BP values in pts. with chronic HTN, precipitous drop in cerebral perfusion occurs(renal, cerebral, coronary ischemia) It is IMPORTANT to understand autoregulation in this concept b/c it is integral in making rec. for managing HTN urgency |
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Before you start making suggestions for treatment of HTN urgency, what must be assessed prior to your recommendation?
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Adherence
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In the clinic setting, which labs would you recommend to rule-out end-organ
damage? (this may rely heavily on the patients past medical history) |
Think about organ systems effected acutely by incrased BP
Labs: Kidney: BMP, urinalysis heart: EKG, chest X-Ray Endocrine: TSH |
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Two different ways to manage HTN Urgency:
List |
1. Adjust Chronic/maintenance meds
Preferred Approach 2. Initiate short-term fast-acting anti_HTN medication to patient's current regimen. Pref. add agent that coincides w/ guidlines for long term control of BP |
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Managing HTN Urgency:
Adjusting chronic/maintenance medications (preferred approach) |
Adjusting chronic/maintenance medications (preferred approach)
• Adjust dose of current medication(s). This will provide a gradual reduction in BP, which is much safer than a rapid decrease in BP. • Add on an additional antihypertensive medication to the patient’s current regimen. Preferably adding an agent that coincides with guidelines for long term control of blood pressure. |
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Managing HTN Urgency:
Initiate a short-term fast-acting antihypertensive agent that will help acutely manage the patient. |
Initiate a short-term fast-acting antihypertensive agent that will help acutely
manage the patient. • If short acting is chosen, monitor BP every 15-30 minutes • Loop diuretics should be used with caution: o Patients may be volume depleted secondary to BP-induced natriuresis o Unless there is clear evidence of volume overload, avoid diuretics • AVOID immediate-release nifedipine: o Very rapid (too rapid) onset of action that can decrease cerebral blood flow o Not FDA approved for treatment of hypertension (immediate release form) o Heightened risk for MI and stroke (confirmed by multiple case reports) o NEVER USE, especially for this indication |
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Short Acting Agents for HTN Urgency
List |
labetalol
metoprolol tartrate captopril clonidine |
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Labetolol
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alpha/beta blocker
short acting agent SE: bronchoconstriction, heart block, bradycardia caution: asthma, COPD |
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Metoprolol Tartrate
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beta blocker
50/200 mg PO bid SE: bronchoconstriction, heart block, bradycardia caution: asthma, COPD |
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Captopril
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ACE-inhibitor
SE: hyperkalemia, may worsen renal function caution: CKD |
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clonidine
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alpha 2 agonist
useful in cocaine related HTN may cause rebound HTN |
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How to choose treatment choice in HTN urgency
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With regard to these treatment choices, there is NO right or wrong answer; however,
one option may be more appropriate in a given patient. Look at the whole clinical picture. o There may be a compelling indication for a particular antihypertensive (ie ACE inhibitor in patients with diabetes, chronic kidney disease, or congestive heart failure) o Monitor patients in 1 to 7 days. Appropriate follow-up is necessary to ensure continued, optimal hypertension management o Use JNC 7 guidelines to recommend monitoring strategies |
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When to follow up HTN urgency:
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1-7 days
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Why is it important to make sure HTN urgency pts. are controlled acutely and chronically?
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Hypertensive Urgency is associated with increased risk for future cardiovascular events.
Prospective trial in Journal of Hypertension (Vlcek et al, 2008) collected data comparing cardiovascular events suffered by hypertensive patients who were diagnosed with hypertensive urgency (n=384) and those who were not (n=295). o 88 patients (22%) in hypertensive urgency group vs. 42 patients (14%) in control group had a cardiovascular event during follow-up (p = 0.005) o Both groups had similar rates of blood pressure control ( < 135/85 mmHg) after presentation (p = 0.12) |
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Etiologies of HTN Emergency:
List |
1. pheochromocytoma crisis(CCA surge)
2. drug induced 3. eclampsia 4. head injuury 5. severe epitaxis(nosebleed) 6. cardiac 7. CNS |
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Drug induced causes of HTN emergency
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Drug-Induced
- MAOI-tyramine interactions - Overdose with PCP, cocaine, or LSD - Drug interaction-induced hypertension - Clonidine withdrawal |
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Cardiac causes of HTN emergency
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Cardiac:
- Acute aortic dissection - Acute left ventricular failure - Acute or impending MI - Coronary bypass surgery |
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CNS causes of HTN emergency
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CNS
- Intracranial bleed - Subarachnoid hemorrhage |
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Onset HTN Emergency
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abrupt to hours,
occurs immediately |
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DBP HTN emergency
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> or = 140 mmHg
usually b/w (110-140 mmHg) |
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Ocular Findings HTN Emergency
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Papiloedema,
Blurry vision, loss of sight, Wool spots, Retinal hemorrhages |
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cardiac findings HTN emergency
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S1/S3(swish b/c increased preload)
MI, LVH, angina Aortic dissection |
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pulmonary findings HTN emergency
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Acute pulmonary edema
Rales(fluid accumulation) |
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renal findings HTN emergency
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Acute renal failure (Scr > 3 mg/dl)
(double Scr = ARF) |
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CNS findings HTN emergency
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Dizziness, encephalopathy,
Confusion, weakness, stroke Intracranial/subarachnoid hemorrhage, Seizures |
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GI findings HTN emergency
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Nausea/ vomiting
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Prognosis HTN emergency
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fatal w/in hours
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Goals of therapy
HTN Emergency (rules of thumb) |
1. DBP ~100-110
dont aim for <100 2.calculate MAP (2*DBP + SBP)/3 reduce MAP by 10-20% DONT reduce by >50mmHg |
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Why don't we want to NORMALIZE BP in HTN emergency?
|
in HTN, body autoregulates, and shifts curve to the right.
if decrease BP too quickly, body's autoregulattory mechs can't respond. want to decrease MAP no more than 50 mmHg in HTN pts because too much can lead to no/not enough cerebral perfusion=>stroke |
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Advantages vs. Disadvantages:
Esmolol |
Advantage:
Easily titrated; continuous infusion, rapid onset, short duration; Metabolized by easterases in the blood and not metabolized hepatically or cleared renally; disadvantage: Can’t use really use in those with COPD or asthma (e.g., bronchospastic disease); shouldn’t use in patients with heart failure or those with heart block or bradycardia |
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Advantages vs. Disadvantages:
Clevidipine |
advantages:
Easily titrated; continuous infusion, rapid onset, short duration; Undergoes hydrolysis in the blood and not metabolized hepatically or cleared renally disadvantages: Bottle is only good for 4 hours, can’t use if I already have hypertriglycerdeima or soy, soy bean, egg allergy, every expensive |
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Advantages vs. Disadvantages:
Nicardipine |
Advantages:
Easily titrated; continuous infusion, rapid onset, short duration; while metabolized hepatically no dosing adjustments needed for hepatic or renal impairment, beneficial in heart failure patients by reducing afterload Disadvantages: Reflex tachycardia and expensive |
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Advantages vs. Disadvantages:
Fenoldopam |
Advantages:
Easily titrated; continuous infusion, rapid onset, short duration; vasodialtes renal arteries so may improve GFR and urine output but this is debateable; no dosage adjustments needed for renal or hepatic dysfunction disadvantages: Reflex tachycardia and expensive |
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Advantages vs. Disadvantages:
Nitroglycerin |
Advantages:
Easily titrated; continuous infusion, rapid onset, short duration, coronary vasodilator so will help with chest pain, very cheap, works in heart failure patients as it reduces preload, no dosing adjustments needed for hepatic or renal impairment Disadvantages: Tolerance will develop, HA, inorder to reduce BP will need higher doses |
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Advantages vs. Disadvantages:
Nitroprusside |
Advantages:
Easily titrated; continuous infusion, rapid onset, short duration, , very cheap, works in heart failure patients as it reduces preload and afterload Disadvantages: Should not use in patients with chest pain due to coronary steal phenomena (see below) or those with hepatic impairment (as the cyanide will have trouble being converted to thiocyanate) or renal impairment (as both cyanide and thiocyante are cleared renally) |
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What is coronary steal?
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When nitroprusside is administered it can cause a coronary steal phenomena. After an acute myocardial
infarction, the coronary arteries within the necrotic tissue are subsequently damaged. Rather than taking on the characteristics of an artery, they act more more veins. Remember that nitroprusside is more of an arterial than a venodilator. So, when we administer nitroprusside we vasodilate the healthy coronary arteries and NOT the damaged arteries which are actually more like veins. Blood always follows the path of least resistance so the vasodilated coronary arteries steal away the blood away from the damaged tissue that truly needs it thus leading for increasing necrosis. To prevent this phenomena from happening, we can administer a venodilator like nitroglycerin with nitroprusside so that we dilate those damaged coronary arteries. |
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MR is 55 year old black male, who presents to the ER with a 4-day history of increasing SOB. Over the past 2
days, he developed a severe HA unrelieved by NSAIDS, as well as substernal chest pain, anorexia, and nausea. PMH: Meds: NKDA Asthma Albuterol MDI Lisinopril Angina x 5 years Furosemide ISDN AMI ( 2months ago) Felodipine Physical Exam: Current Wt: 150 lbs Ht: 5'10" BP(standing): 220/145 BP (supine): 220/142 Oxygen sat: 88% HR: 125 RR: 36 Temp: 989 Gen: slightly cachectic, anxious-appearing male HEENT: arteriolar narrowing and AV nicking without hemorrhages, exudates, papilledema -JVD, + bilateral carotid bruits Card: RRR. + S3/S4 galllop , no murmurs Resp: inspiratory rales and decreased breath sounds GI: + Bowl signs GU: Denies dysuria or incontinence Extremities: warm with no edema Neuro: Alert and Oriented x 3. Labs: Na = 142 mEq/L, Cl = 101 mEq/L, K = 4.9 mEq/L, CO2 = 23 mEq/L, BUN = 30 mg/dl, Scr = 1.5md/dl, Gluc = 100 mg/dl; INR = 1.08, WBC = 8.0, Hgb = 13 g/dl, Hct = 38%. Case: Address for Signs of End organ damage |
1. CNS: severe HA unrelieved by NSAIDS, + bilateral carotid bruits. This last sign means that a
“swishing” sound can be heard over the carotid arteries that are feeding the brain. Normally I would hear this swishing sound. By hearing this sound, this means that I have constriction ongoing in the carotid arteries. The good thing is that this patient is still alert and oriented x 3, meaning to time (e.g., they can tell you the time), place (eg., they know where they are) , and person (e.g., they know their name). In the eye exam, the patient has + papilledema and arteriolar narrowing of the vessels of the retina. 2. Cardiovascular: +S3 sound (meaning increase preload), EKG indicative of left ventricular hypertrophy, chest Xray indicative of cardiomegaly (enlarged heart), + chest pain 3. Pulmonary: inspiratory rales and decreased breath sounds, shortness of breath 4. Renal: Increased serum creatinine (we will need to see the baseline to know if he really has acute renal failure) but he is spilling protein and blood into his urine. So, does he have organ dysfunction…YES. Remember this patient has multiple signs and symptoms of organ dysfunction. He only needs ONE to qualify for HTN emergency |
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Furosemide
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bad at decreasing BP, better as preload reducer
causes volume depletion, hypokalemia |
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Hydralazine
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SE: drug induced lupus, tachycardia, flushing, HA, vomiting, aggravation of angina
dosed intermittently, not really used in HTN emergency |
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Enalaprilat
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SE: variable response, first dose response, worsen renal failure
|
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labetolol
|
dosed intermittently, not really used in HTN emergency
SE: vomiting, scalp tingling, heart block, orthostatic HTN |
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Furosemide Dosing
|
20-40 mg in 1-2 min
onset: 5-15 mins DOA: 2-3 hrs |
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Nitroprusside Dosing
|
0.25-10 mcg/kg/min
(max 2 mcg/kg/min, max 7 days) onset: immediate DOA: 1-2 mins |
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Nitroglycerin dosing
|
5-100 mcg/min
(double q 10 mins if needed) onset: 2-5 mins DOA: 5-10 mins |
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Fenoldopam dosing
|
0.1-0.3 mcg/kg/min
onset: 4-5 mins DOA: 30 mins |
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Nicardipine Dosing
|
5-15 mg/hr
(easily titrate q 10 mins) onset: 5-10 mins DOA:15-30 mins, may exceed 240 mins |
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Clevidipine dosing
|
1-2 mg/hr (32 mg/hr max)
onset: 2-4 mins DOA: 5-15 mins |
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Hydralazine dosing
|
10-20 mg IV
10-50 mg IM Dose intermittently onset: 10-20min IV, 20-30 min IM DOA: 1-4 hrs IV, 4-6 hrs IM |
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Enalaprilat Dosing
|
0.625-1.25 mg IV q 6 hrs
onset: 15 mins DOA: 6 hrs |
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Esmolol dosing:
|
200-500 mcg/kg/min for 4 mins, the 50-300 mcg/kg/min IV
Slowly titrate up onset 1-2 mins DOA:10-20 mins(cleared by esterase in blood) |
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Labetolol dosing
|
20-80 mg IV bolus q 10 mins
dose intermittenly onset: 5-10 mins DOA: 3-6 hrs |