Primary Care - Cardiovascular Flashcards
Define hypertension
What are the risk factors for hypertension?
- BP persistently above 140/90mmHg.
- has to be confirmed by either HBPM or ABPM (135/85)
Unmodifiable
- black African or black Caribbean
- age
- family history of HTN/CVD/ high cholesterol/diabetes/kidney problems/stroke/heart attack
- sex (men more at risk <65, women more at risk >65)
modifiable
- high salt diet
- lack of exercise
- drinking
- obesity
- smoking
- anxiety/stress
Describe how the renin-angiotensin system works
1) If renal perfusion is low, kidney juxtaglomerular cells convert pro-renin (present in blood) into renin
2) Renin converts angiotensinogen (secreted by liver) into angiotensin I
3) Angiotensin I is converted to angiotensin II by angiotensin-converting enzyme (ACE), released from lungs
4) Angiotensin II is potent vasoconstrictor + promotes adrenal glands to produce aldosterone
5) Aldosterone makes kidneys reabsorb sodium and water into blood (and excrete potassium to maintain electrolyte balance)
What are the stages of hypertension? Explain how you would manage the stages?
Stage 1: clinic blood pressure at least 140/90 and (confirmed by ABPM 135/85)
Stage 2: clinic BP >160/100; ABPM >150/95.
Stage 3: Severe hypertension: >180/110
Malignant: >200/120
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Management
-For stage 1 and 2 do ABPM/HBPM and while your waiting check for end organ damage. Review both in 1 month. In the mean time advise lifestyle
- For severe do not bother with the ABPM or HBPM, start medications right away
- For severe with signs of end organ damage (accelerated) (papilodemia/retinopathy/chest pain/AKI) you should refer them for same day special care
IF LESS THAN 40 refer to CVD specialist
10% of hypertension is caused by secondary causes, what are some examples? (6)
Low renal flow (effects of renin and aldosterone)
- glomerulonephritis/atherosclerosis/vasculitis/aortic dissection/fibromuscular dysplasia
- Conn’s adenoma - tumour of adrenal gland leading to high levels of aldosterone
- Phaeochromocytoma - tumour in the adrenal medulla that causes sympathetic nervous system activation leading to increased BP, HR, anxiety, palpitations and skin presentations (urgent referral)
↑ 24hr Urinary metenepherine
Give Phenoxybenzamine (a blocker) then Propanolol (BB) - Pregnancy
- Steroids, OCP and HRT
- White coat hypertension (discrepancy more than 20/10mmHg)
While your waiting for your ABPM/HBPM what investigations would you do?
ABPM/HBPM - required to confirm diagnosis, in the meantime investigate for end organ damage and risk factors:
- Lipids
- Hba1C
- Total cholesterol and HDL cholesterol
Kidneys:
- U+Es, creatinine and egfr
- Urine dipstick (heamaturia) and Albumin:creatinine (proteinuria) >3 signif
Cardiovascular:
- Qrisk3 >20%
- ECG
Eyes:
-Fundoscopy (arteriolar constriction, arteriovenous nicking, vascular wall changes, flame-shaped hemorrhages, cotton-wool spots, yellow hard exudates, and optic disk edema)
What is ABPM?
How do you do home BP monitoring?
ABPM (ambulatory)
- For for 12 hours
- It automatically takes 2 readings every hour
- The cuff might tight unexpectedly and it might not be predictable when it is going to do it.
- It needs to take AT LEAST 14 measurements before it can start to calculate averages (24 hours)
If < 80 treat BP ≥ 135/85; if > 80 treat BP ≥ 145/85
HBPM (if they cant do ABPM due to unpredictability)
- Twice a day for 7 days (morning and eve)
- Each of BP recording must be done twice at least 1 minutes apart with patient seated
- Discard readings for day 1 (getting used to it)
- Take an average of the rest
What score is relevant to HTN?
How do the results effect management?
QRISK3
- Estimates 10-year risk of developing CVD
- If over 20%, consider high risk and encourage patient to take statin
- Between 10-20% is moderate risk; NICE recommends discussing with patient about starting a statin
When would you treat HTN with medications?
HTN and medications
offer all patients lifestyle advice diet (↓salt, sugar, fats), weight loss, ↑exercise, smoking, ↓alcohol, ↓caffeine
- treat all stage 3/severe HTN >180/110
- if stage 1 (140/90) or stage 2 (160/100) they will have an ABPM
- if ABPM <135/85 don’t treat (unless clear end organ damage)
- if ABPM 135/85+ then treat if QRISK2 score ≥20% (or if end organ damage)
- Treat all confirmed stage 2 (ABPM 150/95+)
What is the drug treatment of hypertension?
Step 1: A or C
- <55 years or diabetic of any age - ACE INHIBITOR (ramipril 2.5mg OD)
- If patient doesn’t tolerate then consider ARB (sartan)
55 years+ or Black of any age- CALCIUM CHANNEL BLOCKER (amlodipine 5mg PO OD)
-if patient doesn’t tolerate give thiazide like diuretic
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Step 2: A and C (or A and D if CCB not tolerated)
- If patient was on ACEi, then add calcium channel blocker
- If patient was on calcium channel blocker then consider adding ARB
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Step 3: A and C and D
ACEi/ARB + Ca channel blocker + thiazide diuretic
Ramipril, Amlodipine + (Indapamide or Chlortalidone)
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Step 4: REFER TO SPECIALIST
If potassium <=4.5 add spironolactone
If potassium>4.5 add beta (atenolol) or alpha blocker (tamsulosin/carvedilol)
Ramipril, Amlodipine, Indapamide, spironolactone (check K+)
When are beta-blockers first line for HTN?
1) Resistant hypertension when potassium is high so cant use spirolactone
2) Pregnant women - ACEi are teratogenic in 1st trimester (give labetolol)
Give an example of a thiazide
What is the mechanism of action of thiazides?
Thiazide diuretics e.g. Indapamide or Chlortalidone
- INHIBIT sodium REABSORPTION at DISTAL convoluted tubule by binding to Na/Cl co-transporter
- This causes increased Na + K excretion
When are thiazides contraindicated?
(Thiazides increase Na+ and K+ excretion)
- Hyponatraemia - in the elderly, thiazides are a common cause of hyponatraemia
- Hypokalaemia
- Hypercalcaemia
- Renal impairment
Example of a loop diuretic? What is the mechanism of action of loop diuretics?
How do they compare to thiazides?
Loop diuretic e.g. Furesamide
- They inhibit resorption of sodium in ascending loop of Henlé
- This causes increased Na+ and K+ excretion
Compared to thiazides:
- more potent
- shorter half-life
- better tolerated in patients with CKD
Example of potassium sparing diuretic? What is the mechanism of action of potassium-sparing diuretics?
Potassium sparing diuretic e.g. spironolactone
- Aldosterone antagonist
- Competitively inhibit aldosterone-dependant sodium-potassium exchange channels in the distal convoluted tubule
- This action leads to increased sodium and water excretion, but more potassium retention
When are ACE inhibitors contraindicated?
- Renal artery stenosis
- Pregnancy
- Hyperkaleamia (reduced aldosterone>reduced K excretion)
What the side effects of ACE inhibitors?
- Dry cough
- Impotence/sexual dysfunction
- Hypotension - take the first one in bed at night
What is decubitus angina?
Occurs when lying down
Impaired left ventricular function due to severe coronary artery disease
What differentiates stable angina/CAD from ACS?
- relieved by GTN spray
- relieved by rest
- lasts less than 20 minutes
What are the 5 types of MI?
- Spontaneous MI due to plaque rupture
- Low oxygen/hypoperfusion due to increased oxygen demand (fibrillation/tachycardia) or decreased supply (septic shock, anaemia)
- Sudden unexpected cardiac death
- Associated with PCI or stent thrombosis
- Associated with cardiac surgery
What are the risk factors for prinzmetal (spazmodal) angina?
Things that cause coronary artery vasospasm e.g.:
- Cocaine
- Smoking
- Low magnesium
What does an ECG of a STEMI show at different time points post-MI?
5-30 mins: tall tented T waves Hours: ST elevation Days: inverted T waves + development of Q waves Months: Q waves remain might get LBBB
When do troponin levels risk, peak and return to baseline?
Levels increase 3-12 hours from pain onset
They peak at 24-48 hours
Return to baseline 5-14 days
What is the acute management of a STEMI?
ABCDEG assessment and ROMANCE -Reassure patient -Oxygen (low flow) if sats <90% or breathless -Morphine (5-10mg IV) and metoclopramide -Aspirin (300mg PO, then 75mg OD) -Nitrates (GTN spray) Ticagrelor (180mg PO, then 90mg OD) -ECG monitoring throughout
If <12 hours since onset and PCI available within 120 mins
-PCI and anticoagulant (unfractionated as shorter half-life)
If <12 hrs since onset + PCI NOT available within 120 mins
- Thrombolysis and anticoagulation (heparin)
- THEN transferred to PCI centre (either rescue PCI or angiography)
if they cant have either repercussion treatments, give heparin
What should be checked in all post-ACS patients?
Echocardiogram - check LV function
Lipid profile
HbA1c
What is the delta change in troponin levels?
- Delta troponin is the percent difference between two troponin results taken in the same patient within a 3 - 8 hour time period
- If it is greater than 20%, this is consistent with an MI
What are the DVLA regulations regarding ACS?
Stop driving for 4 weeks if no PCI/unsuccessful PCI
OR
Stop driving for 1 week if successful PCI
In both cases, the DVLA does not need to be informed
HGV drivers must inform the DVLA and stop driving for 6 weeks then meet with doctor to see if fit
What is the management of angina?
MANAGE RISK FACTORS
MANAGE SYMPTOMS
- 1st line - BETA-BLOCKER/CCB + GTN as rescue
-If both beta-blockers and CCBs are contraindicated or not tolerated, consider monotherapy with one of the following drugs:
-A long-acting nitrate (such as isosorbide mononitrate).
-Nicorandil (K+ channel blocker)
-Ivabradine
-Ranolazine
2nd line
Beta blocker and long acting dihydropyridine CCB combined (nifedipine, amlodipine)
SECONDARY PREVENTION
- Anti-platelet (low dose aspirin 75 mg daily or clopidogrel (If PVD/stroke should continue to use clopidogrel)
- ACE-I if stable angina and risk factors (diabetes, CKD, HTN)
- Statin
-Patients with stable angina should be considered for re-vascularisation (with CABG or PCI) CABG better is 65+ or diabetic
What advise do you give to patients about using GTN spray?
- GTN spray - when you have chest pain, stop what you’re doing, sit down and spray GTN under lounge
- If the symptoms are still there after 5 minutes take another dose… if the symptoms persist after 5 minutes again then ring an ambulance
How can you describe heart failure?
What classification is used to determines someones functionality in heart failure?
When the cardiac output is inadequate for the body’s requirements leading to peripheral hypoperfusion
THE NEW YORK CLASSIFICATION (1-4)
(my adaption)
1. Feels fine. No limitation (heart disease but no undue dyspnoea from normal activity)
2. Climbing stairs. Slight limitation (comfortable at rest, dyspnoea on normal activity)
3. Getting dressed. Marked limitation (less than ordinary activities cause dyspnoea)
4. Sitting down. Dyspnoea at rest, all activity causes discomfort (specialist referral)
- No limitation (heart disease but no undue dyspnoea from normal activity)
- Slight limitation (comfortable at rest, dyspnoea on normal activity)
- Marked limitation (ess than ordinary activities cause dyspnoea)
- Dyspnoea at rest, all activity causes discomfort
What are some causes of high output heart failure?
This is when the heart is working at normal/increased rate but needs of the body are beyond that which heart can supply
- Hyperthyroidism
- Anaemia
- Paget’s disease
- AV malformation
What is the difference between systolic and diastolic heart failure? (comment on most common cause and ejection fraction)
Systolic
- Ventricles enlarged and can’t contract normally
- Resulting in reduced cardiac output
- Most common cause=IHD/MI
- Ejection fraction <40%
Diastolic
- Stiff ventricles (increased filling pressures-can’t fill properly)
- Most common cause=HTN (hypertrophy)
- Ejection fraction >50% (just do furosemide and ACEinhib if HTN)
What are some causes of systolic/diastolic heart failure?
Causes of systolic heart failure
- Ischaemic heart disease
- MI
- Cardiomyopathy
Causes of diastolic heart failure
- Constrictive pericarditis
- HTN
- Cardiomyopathy
How does left ventricular heart failure present? (symptoms and examination findings)
Failure of the left side of the heart causes blood to back up into the lungs, causing respiratory symptoms as well as fatigue due to insufficient supply of oxygenated blood
- Dyspnoea → Orthopnoea → PND (night cough) due to pulmonary oedema
- Pink frothy sputum
- Wheeze (cardiac asthma)
- Fatigue, weight loss, muscle wasting
Examination signs:
- Cyanosis, increased RR
- Basal fine crepitations
- Displaced Apex + RV Heave + S3 (compliant LV)
- Pulsus alternans (alternate strong and weak beats)
How does right ventricular heart failure present?
Failure of the right ventricle leads to congestion of systemic capillaries, which generates excess fluid accumulation in the body -Peripheral oedema -Calf swelling -Ascites •can cause N+V>pressure on stomach •can cause dyspnoea>pressure on IVC and diaphragm •weight gain •↑JVP – distended
What is the blood pressure like in heart failure?
Low BP with narrow pulse pressure (decreased pumpinig)
What is the pulse like in heart failure?
Heart failure
- Pulse alternans - alternate strong and weak beats
- Increased HR
What would you feel on palpation of heart failure?
Heart failure
- Displaced apex beat - LV dilated
- parasternal heave (RVH-closest side to chest wall)
What would you hear on auscultation of LEFT ventricular failure?
Left ventricular failure
- Gallop rhythm due to presence of S3 (blood hitting a non compliant Left ventricle)
- wheeze (cardiac asthma)