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Define of chronotropic incopmpetence
inability of the heart to regulate its rate appropriatley in response to physiologic stress (metabolic demand)
Chronotropic incompetence is the inability to do what three things?
- 1. accelerate rate
- 2. maintain rate
- 3. decelerate rate
Chronotropic Incompetence is a Class what classification?
CI is inability at the peak of excerice to get above ?
5 possible causes of CI
- 1. age related sinus node dysfunction
- 2. secondary to other cardiac diseases
- 3.medication side effect (beta blockers, calcium channel blockers, digitalis)
- 4.autonomic dysfunction
- 5.endocrine-metabolic diseases
Less-active, less fit subjects require ___________ submaxima rate supprt
- volume of air inhaled and exhaled in one breath
- Rest: 0.5-1 liter
- Exercise: 2-5 liters
tidal volume * respiratory rate
amount of breaths in one minute
Rest: 10-16 breath
What is the best sensor?
a functioning sinus node
Ideal sensor has these quailities
- no special lead
- automatic tailoring of therapy
- supports broad range of lifestyles
- physiloigc response
- supports rates at rest, daily activities, exertion
1st rate responsive pacemaker
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Closed Loop Stimulation
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