Hypertension Flashcards
Blood Pressure Classification
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Secondary Hypertension
- A specific, remediable cause of hypertension can be identified in ~10%
Clues in suspecting Secondary hypertension
- Abrupt onset of hypertension or eacerbation of previously controlled hypertension
- Age of onset <20 or >50 years old
- No family history of HPN
- DBP >110-120 mmHg
- Sudden increase in BP in a patient with stable 1 HPN
- Poor BP control (despite good compliance to adequate drug therapy) or malignant HPN
- Systemic findings
- weight loss/gain
- unprovoked or excessive hypokalemia
- Disproportionate target organ damage for degree of hypertension
Renal cause of Hypertension
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CLINICAL CLUES
- Hematuria, urinary symptoms, elevated creatinine, casts on urinalysis
- Abdominal mass (in Polycystic kidney disease), pallor
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DIAGNOSTIC TESTS
- Renal ultrasond
- Tests to evaluate renal disease
Renovascular disease causing Hypertension
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CLINICAL CLUES
- Abrupt onset of hypertenson or worsening or difficult to control
- Flash pulmonary edema
- Early-onset hypertension (such as in fibromuscular dysplasia)
- Abdominal bruits
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DIAGNOSTIC TESTS
- Renal dplex Doppler UTZ
- Abdominal CT or MRA
- Angiography
Primary Hyperaldoteronism causing hypertension
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CLINCAL CLUES
- Hypertension with spotaneous hypokalemia
- Adrenal mass
- Arrhytmias from hypokalemia
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DIAGNOSTIC TESTS
- Plasma aldosterone/renin ratio
- Oral sodium loading test
- IV saline infusion test
- Adrenal CT scan
- Adrenal vein sampling
Obstructive Sleep Apnea causing hypertension
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CLINICAL CLUES
- Resistant hypertension
- Snoring, apnea during sleeping, day-time sleepiness
- Obesity
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DIAGNOSTIC TESTS
- Berlin Questionnaire
- Epworth Sleepiness score
- Overnight oximetry
- Polysomnography
- At least 3 separate clinic based measurements >140/90 mmHg and at least 2 non clinic based measurements <140/90 mmHg in the absence of any evidence of target organ damage
White coat hypertension
- Use amblatory BP monitoring for more accurate diagnosis
Defined as:
- Officce BP >130/80 and with 3 drugs at optimal doses (including a diuretic), or
- Office BP <130/80 but requires >4 drugs
Resistant Hypertension
Fall in SBP >20 mmHg or in DBP >10 mmHg within 3 minutes of assuming upright posture from a a supine position
Orthostatic hypertension
Normal or even low BP, bu with evidence of hypertensive end organ damage
Masked hypertension
- Consider severe peripheral arterial disease causing masked hypertension
Screening for hypertension
(US PREVENTIVE TASK FORCE)
- Screening for high BP in adults >18 years old
- Screening:
- Every 2 years if BP <120/80
- Yearly if BP 120-139/80-89 (pre-hypertensive)
Non pharmacologic Management for Hypertension
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Weight Reduction
- Attain and maintain BMI <25 kg/m2
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Salt and Potassium in diet
- For adults, reduction of Na intake by 1 g/day lowers SBP by 3-4 mmHg 9aim to consume no more than 2.4 g/day of Na)
- Increased K intake may lower BP
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Adapt Dietary Approaches to Stop hypertension (DASH) type dietary plan
- Diet rich in fruits, vegetables,low-fat dairy products, whole grains poultry, fish, nuts
- Diet low in sweets, red meat and saturated/total fat
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Moderation of alcohol consumptions
- <2 standard drinks/day in men
- <1 standard drink/day in women
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Physical Activity
- Regular aerobic activity 93-4 sessions a week lasting 40 mins per session)
- Aerobic physical activity reduces SBP by up to 5 mmHg
Thresholds and Goals of Pharmacological therapy in Patients with Hypertension
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DIURETICS
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BETA BLOCKERS
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Calcium Channel Blockers
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RAAS blockers
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Alpha Blockers
Blocks the post synaptic A1-receptors found in capacitance and resistance vessels
Adverse effects:
- Postural hypotension
- Reflex tachycardia
DRUGS:
- Prazosin 2-20 mg/d (BID or TID)
- Terazosin 1-20 mg/d (OD or BID)
- Doxazosin 1-8 mg/d (OD)
Central Sympatholytics
Activaion of A2-receptors in the CNS
ADVERSE EFFECTS:
- Sedation
- Xerostomia
- Impotence
- CNS side effects
- Rebound HPN on withdrawal (therefore not recommended as emergency meds for crisis/ emergencies)
DRUGS:
- Clonidine 75-150 mcg/d (BID-TID)
- Methyldopa 250-1000 mg/d (BID-TID)
Direct Vasodilators
Release of nitric oxide, leading to arterial vasodilation
ADVERSE EFFECTS:
- Reflex tachycardia
- headache
- Hypotension
- Lupus-like syndrome (for hydralazine)
- Hypertrichosis (for minoxidil)
DRUGS:
- Hydralazine 200-250 mg/d (BID or TID)
- Minoxidil 5-100 mg/d (OD to TID)
Differentiation Between types of Uncontrolled Hypertension
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General Recommendation from 2017 Hypertension Gidelines for hypertensive crisis
- For adults with a compelling condition (aortic dissection, severe preeclampsia/eclampsia, pheochromocytoma crisis), SBP should be reduced to <140 mmHg during the 1st hour and to <120 mmHg in aortic dissection
- For adults without a compelling condition, SBP should be reduced by no more than 25% within the 1st hour, then if stable, to 160/100 mmHg within the next 2-6 hours, and then cautiously to normal during the following 24-48 hours
Nicardipine for hypertensive emergencies)
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DOSE
- 5-15 mg/hr as continuous infusion
- Staring dose 5 mg/hr, increase q5 mins by 2.5 mg/hr until goal BP is achieved; therefore decrease to 3 mg/hr
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CONTRAINDICATIONS and SIDE EFFECTS
- Liver failre
- Severe aortic stenosis
Nitroglycerin for hypertensive emergencies
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DOSE
- 5-20 mcg/min
- Initial 5 mcg/min, then increase in increments of 5 mcg/min q3-5 mins
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CONTRAINDICATIONS and SIDE EFFECTS
- Can cause headaches
Nitroprusside for hypertensive Emergency
-
DOSE
- 0.3-10 mcg/min
- Initial 5 mcg/min, then increase in increments of 5 mcg/min q3-5 mins
-
CONTRAINDICATIONS
- Liver/kidney failure
- Can cause cyanide toxicity
Esmolol for Hypertensive Emergency
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DOSE
- 0.5-1 mg/kg as bolus
- 50-300 mcg/kg/min as infusion
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CONTRAINDICATIONS
- 2nd or 3rd degree AV block, systolic heart failure, bradycardia, COPD
Labetalol for hypertensive emergency
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DOSE
- Initial 0.3-1 mg/kg dose (maximum of 20 mg) slow IV every 10 minutes, or
- 0.4-1 mg/kg/hr IV infusion (up to 3 mg/kg/h). Adjust rate up to total cumlative dose of 300 mg. This dose can be repeated every 4-6 hours
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CONTRAINDICATIONS
- 2nd or 3rd degree AV block, systolic heart failure, bradycardia, COPD
Hydralazine for Hypertensice Emergency
-
DOSE
- Initial 10 mg via slow IV infusion (maximum initial dose of 20 mg)
- Repeat every 4-6 hours as needed
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CONTRAINDICATIONS
- Unpredicatble response and prolonged duration (not a desirable first-line agent)
TREATMENT FOR HYPERTENSIVE EMERGENCIES BASED ON END-ORGAN INVOLVEMENT
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