manifestation of novel social challenges of the …...50% undetected, above 80 the bp decreases)...
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Manifestation of Novel Social Challenges of the European Union
in the Teaching Material of
Medical Biotechnology Master’s Programmes
at the University of Pécs and at the University of Debrecen Identification number: TÁMOP-4.1.2-08/1/A-2009-0011
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CHARACTERISTICS OF
THE CARDIOVASCULAR
SYSTEM,
ABNORMALITIES AND
DISEASES PART 2
Miklós Székely and Márta Balaskó
Molecular and Clinical Basics of Gerontology – Lecture 9
Manifestation of Novel Social Challenges of the European Union
in the Teaching Material of
Medical Biotechnology Master’s Programmes
at the University of Pécs and at the University of Debrecen Identification number: TÁMOP-4.1.2-08/1/A-2009-0011
![Page 3: Manifestation of Novel Social Challenges of the …...50% undetected, above 80 the BP decreases) •Due to the loss of elasticity in the aorta the pulse wave returns too early, disturbing](https://reader033.vdocuments.mx/reader033/viewer/2022042005/5e6fa3c7cff0b1522f1a9a61/html5/thumbnails/3.jpg)
TÁMOP-4.1.2-08/1/A-2009-0011
Left ventricular volume (ml) ventricular
filling
isovolumic
contraction
ejection
isovolumic
relaxation
systolic
pressure
ventricular
diastolic
pressure
Volume-pressure diagrams 1
0 50 10
0
15
0
200 250
Ventr
icula
r pre
ssure
(m
mH
g)
0
50
100
150
200
250
SV
Young
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TÁMOP-4.1.2-08/1/A-2009-0011
Left ventricular volume (ml)
Volume-pressure diagrams 2
0 50 10
0
15
0
200 250
Ventr
icula
r pre
ssure
(m
mH
g)
0
50
100
150
200
250
1st case
systolic
pressure
ventricular
diastolic
pressure
SV
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TÁMOP-4.1.2-08/1/A-2009-0011
Left ventricular volume (ml)
ventricular
diastolic
pressure
Volume-pressure diagrams 3
0 50 10
0
15
0
200 250
Ventr
icula
r pre
ssure
(m
mH
g)
0
50
100
150
200
250
2nd case
systolic
pressure
SV
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TÁMOP-4.1.2-08/1/A-2009-0011
Left ventricular volume (ml)
systolic
pressure
ventricular
diastolic
pressure
Volume-pressure diagrams 4
0 50 10
0
15
0
200 250
Ventr
icula
r pre
ssure
(m
mH
g)
0
50
100
150
200
250
3rd case
SV
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TÁMOP-4.1.2-08/1/A-2009-0011
Left ventricular volume (ml)
systolic
pressure
ventricular
diastolic
pressure
Volume-pressure diagrams 5
0 50 10
0
15
0
200 250
Ventr
icula
r pre
ssure
(m
mH
g)
0
50
100
150
200
250
4th case
SV
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TÁMOP-4.1.2-08/1/A-2009-0011
Exercise in the elderly
• There is a higher sympathetic tone even at
rest
• Diminished contractility
• Tachycardia develops sooner and easier, but
its maximum is limited
• EDV increases quickly, but here the EDp also
increases significantly
• TPR is higher and grows (both the syst. and
diast. pressures increase quickly)
• Stagnation develops quite early (dyspnoe)
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TÁMOP-4.1.2-08/1/A-2009-0011
Maximal heart rate vs. age
Heart rate (bpm)
Trained
Non-trained Mean
Age (years)
200
190
180
170
160
150
140 20 30 40 50 60 70
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TÁMOP-4.1.2-08/1/A-2009-0011
• Impaired coronary perfusion have only a small influence on myocardial
function in healthy old people (of course, severe atherosclerosis does
have!)
• Ejection fraction of healthy old women and men does not decrease at rest
(when the end systolic and end diastolic volumes are comparable to those
in young people)
• Stroke volume: SV × heart rate – does not change with age, even in case
of a slight (still physiological) increase in the systolic pressure. (The stroke
volume would rather increase a little.)
• Heart rate: resting heart rate (horizontal position) in healthy men is not
age-dependent. The respiration-induced changes in heart rate decrease
though. The increase of the heart-rate is age-dependent: 220-age (The
elderly responds to the same stress with smaller increase in heart rate -
120-130 frequency is already submaximal tachycardia)
• Intrinsic sinus rhythm (by symp. and parasymp. blockade)-significantly
decreased with age: at 20-y it is104/min, at 45-55-y 92/min
Age-related alterations in major
cardiac parameters
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TÁMOP-4.1.2-08/1/A-2009-0011
4-5
Tim
e (
min
ute
s)
Endurance times according to age
Maximal oxygen consumption and
endurance times according to age
male female
Maximal oxygen consumption vs. age
VO
2 m
ax (
l/m
in)
6-7 8-9 10-12 14-15 16-18 25 35 45 55 65
5
6
7
8
9
10
11
12
13
0 10 20 30 40 50 60 70 Age (years) Age (years)
1.0
2.0
3.0
4.0
0.0
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TÁMOP-4.1.2-08/1/A-2009-0011
Atherosclerosis
• One of the most significant diseases of the
elderly
• Clinical picture includes: pectoral angina, AMI,
TIA, stroke, dementia, arteriosclerosis
obliterans
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TÁMOP-4.1.2-08/1/A-2009-0011
Risk factors of atherosclerosis 1
Intrinsic risk factors
• Age: male 45, female above 55 years
• Gender: estrogen provides some protection
(TG, lower LDL cholesterol, higher HDL), after
menopausa the protection diappears: by the
age of 60 the risks of the females exceed the
risks of the male
• Genetic factors: familial appearance, inherited
disorders of the lipid metabolism
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TÁMOP-4.1.2-08/1/A-2009-0011
Risk factors of atherosclerosis 2
Extrinsic risk factors
• Smoking (a pack a day increases the risk 2×)
• Hypertension
• Dyslipoproteinemia
• Hyperglycemia, diabetes mellitus
• Obesity
• Homocystinuria
• Hyperuricemia
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TÁMOP-4.1.2-08/1/A-2009-0011
Regulation
• The sensitivity of the baroreceptor reflex decreases
(hypertension or orthostatic hypotension)
• The serum levels of the catecholamines increase (increased
release, diminished elimination)
• The efficacy of the sympathetic tone decreases
• The carotids are more rigid (cardiovagal reflex decreases)
• Vestibulosympathic reflex efficacy also decreases (adaptation
to gravitational forces) – orthostatic hypotension (upon
standing up a blood pressure fall greater than 20 mmHg)
• The venes are more rigid – decreased CVP (decreased
venous stagnation)
• The activity of the plasma renin decreases
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TÁMOP-4.1.2-08/1/A-2009-0011
Pectoral angina
• Above 70 years the prevalence of coronary
heart disease reaches 70%
• The prevalence of “silent ischemia” increases,
especially in females and in diabetics
(autonomic neuropathy)
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TÁMOP-4.1.2-08/1/A-2009-0011
Arrhythmias
• Atrial fibrillation – with heart failure
• AV-nodal re-entry tachycardia
• Multifocal ventricular premature beats
(polymorphic)
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TÁMOP-4.1.2-08/1/A-2009-0011
Hypertension 1
• Age-related hypertension is mostly isolated systolic
hypertension (18-24 years 2.6%, above 75 70.3%,
50% undetected, above 80 the BP decreases)
• Due to the loss of elasticity in the aorta the pulse
wave returns too early, disturbing the systole and
increasing the systolic blood pressure too much
• The pulse-pressure increases, the diastolic pressure
decreases.
• This increased pulse-amplitude is one of the main
cardiovascular risk factors in the elderly
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TÁMOP-4.1.2-08/1/A-2009-0011
Mean aortic pressure and
aortic pulse wave velocity vs. age
10
0
95
90
85
80
20 40 60 80 Age (years)
Me
an
aort
ic p
ressure
(m
mH
g)
▲, ∆
10
5
110
800
600
1,000
1,20
0
Urban Rural
Aort
ic p
uls
e w
ave v
elo
city (
cm
/sec)
●, ○
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TÁMOP-4.1.2-08/1/A-2009-0011
Hypertension 2
• With age not only the amount of collagen increases but
also the rigidity of the collagen – progressive fibrosis
• The vascular diameter decreases relative to the vessel wall
+ endothelial damage decreases the vasodilatory activity
• RAAS activity decreases (decreased sympathetic tone,
decreased responsiveness).
• Plasma norepinephrine increases, but the β-receptor
responsiveness and sensitivity is down
• There is, on average, a 1% annual decrease in the cardiac
output.
• The proportional increase in total peripheral resistance
counteracts this decrease, but the adaptation capacity is
impaired.
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TÁMOP-4.1.2-08/1/A-2009-0011
Hypertension 3
• Age-related hypertension is salt-sensitive – the
nephron number decreases from the original
800,000 to 400,000 by the age of 80. The salt
excretion is also decreased.
• This is explained partly through the decreased
glomerular function, partly by a decreased
production of natriuretic substances (PGE2,
bradykinin)
• The impaired activity of the Na-K ATP-ase pump
may contribute to hypertension – IC Na – Na+/Ca++
exchange – higher IC Ca – higher vascular tone
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TÁMOP-4.1.2-08/1/A-2009-0011
Hypotension
• Decreased baroreceptor reflex + more rigid carotid
leads to a tendency for orthostatic hypotension and
an excessive HR increase upon standing up
• The BP of the elderly must be measured when sitting
and after standing up (BP fall > 20 mmHg)
• Tendency to develop hypovolemia (decreased thirst,
lower ECV, decreased responsiveness of regulatory
hormones) may promote hypotension and increase
mortality
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TÁMOP-4.1.2-08/1/A-2009-0011
Hypertension and therapy
• Decreased filtration surface (decreased endogenous creatinine
clearance) Na retention and the need to apply thiazide diuretics.
• The renal and hepatic clearance of drugs decrease – drug doses
have to be adjusted
• The side effects are less tolerated by the elderly – therapeutic
compliance is decreased (ACE inhibitors – 30% cough, Ca-
channel blockers – 25% swelling of the legs, combined –
dizziness)
Therapy
ACE inhibitors (Angiotensin II type 1 receptor blockers) and
channel blockers (in the elderly appropriate therapy may increase
the well-being of the patient more effectively)
ACE inhibitors and β-blockers (-25% new DM) General outcome: -19 – -26% stroke, -25% coronary incident