IBHRE - Algorithms, functions, equations
What can cause a short AV delay is the response gradual VSS = sudden
or sudden Rate adaptive AV = gradual
Negative AV hysteresis = sudden or gradual
AAIR/DDDR algorithm = sudden
Two most common causes of VSS atrial undersensing and V ectopy
What is another name for PMT endless-loop-tachycardia
What initiates PMT Anything that causes loss of AV synchrony
What programming can be done to prevent crosstalk Decrease Atrial output
Make V channel less sensitive
Increase V blanking
How many bpm is 1 Hz 60 bpm
Hz is measured in Cycles / second
Frequency of R and p waves 5-100 Hz not filtered
Frequency and slew rate of T waves <8 Hz, low frequency and low slew rate
Frequency of external interference 30-300 Hz
Frequency of myopotentials 10-200 Hz
These can be difficult to filter, especially in unipolar myopotentials
What is the most common cause of inappropriate AMS Atrial lead sensing ventricular signals (FFRWOS)
What risks does inappropriate AMS cause Inappropriate treatment for AF (anticoagulants/antiarrhythmics)
Inappropriate inhibition of therapy for ICD patients
Equation for power P=IxV
Power = current x voltage
Open look sensor definition Only takes ion positive feedback
, IBHRE - Algorithms, functions, equations
Closed loop sensor definition Physiologic change converted to rate, which induces a change of the physiologic
parameter in the opposite direction
Primary sensor definition Detects change that determines normal sinus response to physiologic need
Secondary sensor definition Detects internal change that results from exercise
Tertiary sensor definition Detects change as result of exercise
What type of sensor is O2 sat Closed loop
What type of sensor is myocardial contractility closed loop
What type of sensor is QT sensor Open
Is there a clear advantage to an open vs closed loop No
sensor
What type of sensor is MV ( minute ventillation) Open
What type of sensor is pH variation open
What type of sensor is a piezoelectric crystal Open
What type of sensor is an accelerometer open
How does the myocontractility sensor work Measures intracardiac impedance, which is affected by inotropic regulation,
positive feedback increases paces rate before syncope
How does a contraction dynamics sensor work pulse from cathode to generator reflects change in EV contractility and Nervous
innervation, affected by rapid change in blood volume
, IBHRE - Algorithms, functions, equations
Which sensor is able to differentiate between workload Contraction dynamics
and mental stress
what may happen in contraction dynamics sensor due to inappropriate sinus tach
posture change
What is PEA and how is it useful Separate lead, utilizes accelerometer to monitor inotropic drug therapy and can
be helpful in differentiating between VT or SVT
How does a pizeoelectric crystal work detects frequencies related to heel strike and responsive to up and down motion
What are some downsides to motion based sensors not direct relationship between detected activity levels and metabolic demand,
susceptible to environmental noise and pressure on can
What are examples of partially open loop sensors temperature and respiration
How does MV sensor work uses thoracic impedance to measure tidal volume and respiratory rate, every 50
ms
What is the relationship between transthoracic Increases with inspiration, decreases with expiration
impedance and respiration
What is transthoracic impedance most closely related to volume and resistivity of blood in right heart and systemic venous system
When body begins exercise, what is the first thing that Dip in body temp due to venous blood pooled in legs and arms surging into
happens to body temp and why thoracic cavity
What % of patients can experience phantom shocks due 5%
to fear
What is the health care utilization increase in pateints 25 x
treated for VT with shocks vs ATP only
How much longevity is a full energy shock equivalent to 1 month
Both appropriate and inappropriate shocks are Mortality
independent predictors of ______
Patients with this syndrome are 2x more likely to receive Brugada syndrome, T wave oversensing
inappropriate shocks, due to what
What can cause a short AV delay is the response gradual VSS = sudden
or sudden Rate adaptive AV = gradual
Negative AV hysteresis = sudden or gradual
AAIR/DDDR algorithm = sudden
Two most common causes of VSS atrial undersensing and V ectopy
What is another name for PMT endless-loop-tachycardia
What initiates PMT Anything that causes loss of AV synchrony
What programming can be done to prevent crosstalk Decrease Atrial output
Make V channel less sensitive
Increase V blanking
How many bpm is 1 Hz 60 bpm
Hz is measured in Cycles / second
Frequency of R and p waves 5-100 Hz not filtered
Frequency and slew rate of T waves <8 Hz, low frequency and low slew rate
Frequency of external interference 30-300 Hz
Frequency of myopotentials 10-200 Hz
These can be difficult to filter, especially in unipolar myopotentials
What is the most common cause of inappropriate AMS Atrial lead sensing ventricular signals (FFRWOS)
What risks does inappropriate AMS cause Inappropriate treatment for AF (anticoagulants/antiarrhythmics)
Inappropriate inhibition of therapy for ICD patients
Equation for power P=IxV
Power = current x voltage
Open look sensor definition Only takes ion positive feedback
, IBHRE - Algorithms, functions, equations
Closed loop sensor definition Physiologic change converted to rate, which induces a change of the physiologic
parameter in the opposite direction
Primary sensor definition Detects change that determines normal sinus response to physiologic need
Secondary sensor definition Detects internal change that results from exercise
Tertiary sensor definition Detects change as result of exercise
What type of sensor is O2 sat Closed loop
What type of sensor is myocardial contractility closed loop
What type of sensor is QT sensor Open
Is there a clear advantage to an open vs closed loop No
sensor
What type of sensor is MV ( minute ventillation) Open
What type of sensor is pH variation open
What type of sensor is a piezoelectric crystal Open
What type of sensor is an accelerometer open
How does the myocontractility sensor work Measures intracardiac impedance, which is affected by inotropic regulation,
positive feedback increases paces rate before syncope
How does a contraction dynamics sensor work pulse from cathode to generator reflects change in EV contractility and Nervous
innervation, affected by rapid change in blood volume
, IBHRE - Algorithms, functions, equations
Which sensor is able to differentiate between workload Contraction dynamics
and mental stress
what may happen in contraction dynamics sensor due to inappropriate sinus tach
posture change
What is PEA and how is it useful Separate lead, utilizes accelerometer to monitor inotropic drug therapy and can
be helpful in differentiating between VT or SVT
How does a pizeoelectric crystal work detects frequencies related to heel strike and responsive to up and down motion
What are some downsides to motion based sensors not direct relationship between detected activity levels and metabolic demand,
susceptible to environmental noise and pressure on can
What are examples of partially open loop sensors temperature and respiration
How does MV sensor work uses thoracic impedance to measure tidal volume and respiratory rate, every 50
ms
What is the relationship between transthoracic Increases with inspiration, decreases with expiration
impedance and respiration
What is transthoracic impedance most closely related to volume and resistivity of blood in right heart and systemic venous system
When body begins exercise, what is the first thing that Dip in body temp due to venous blood pooled in legs and arms surging into
happens to body temp and why thoracic cavity
What % of patients can experience phantom shocks due 5%
to fear
What is the health care utilization increase in pateints 25 x
treated for VT with shocks vs ATP only
How much longevity is a full energy shock equivalent to 1 month
Both appropriate and inappropriate shocks are Mortality
independent predictors of ______
Patients with this syndrome are 2x more likely to receive Brugada syndrome, T wave oversensing
inappropriate shocks, due to what
