Pacing and CIED's Flashcards
Lance Carter, AA-C
Temporary Cardiac Pacing (4)

Transcutaneous Pacing

Disadvantages to Transcutaneous Pacing (3)

Placement Options for Transesophageal Pacing (2)

Advantages/disadvantages to Transesophageal Pacing (4)

Temporary Transvenous Placement (3)

Advantages (3) & Disadvantages (2) to
Temporary Transvenous Placement

Epicardial Pacing

Cardiovascular Implantable Electronic Devices (CIEDs)

Three types of CIEDs

Two primary reasons for a patient to receive a pacemaker (2)

Automated Implantable Cardioverter Defibrillators (AICDs) (2)

Biventricular pacemakers

Capture Threshold

Normal Capture Ranges (Normal “Pacing Threshold”)

Maintenance & Sensitivity Threshold

Potential sources of heart beats in patient’s with pacemakers (2)

Demand Mode

Pacemaker “Sensing”

The Effect Of Cautery On Pacemakers

Pacemaker Dependent Patients

Asynchronous Mode

The Problem With Asynchronous Mode

The Advantage of Asynchronous Mode

Pacemakers should only be placed in asynchronous mode if (2)

Clinical Use Of Asynchronous Mode

Converting Pacemakers To Asynchronous Mode

How does rate modulation work?

Antitachycardia Pacing (ATP)

Indications For A Pacemaker (5)

What type of pacemaker should be used for this patient?
–Atrial? Ventricular? Or dual chamber (atrial + ventricular)?

Atrial

What type of pacemaker should be used for this patient?
–Atrial? Ventricular? Or dual chamber (atrial + ventricular)?

Ventricular
Because constant atrial activity would not allow the pacemaker to pace if it were only in atria


Single Chamber Pacemaker (in the Right Ventricle)
What type of pacemaker should be used for this patient?
–Atrial? Ventricular? Or dual chamber (atrial + ventricular)?

Dual-chamber
Complete AV block and atrial lead is used to “sense” atrial activity

Fixing Complete Heart Block With Pacing

Single Chamber Pacemaker for Complete Heart Block



Dual Chamber Pacemaker With A Normal ECG
Intrinsic rate is faster and SA/AV are working fine

Dual Chamber Pacemaker With Atrial Only Pacing
Patient has a slow SA node, but normal AVN conduction

Dual Chamber Pacemaker With Ventricular Only Pacing (Most common)
Normal SAN function, but complete heart block present

Dual Chamber Pacemaker With Dual Chamber Pacing
SAN/AVN both are non-functional (Sinus bradycardia and complete heart block present)
Biventricular Pacemaker

Why Have An Additional Lead In The Left Ventricle? (2)

Implantable Cardioverter Defibrillator (ICD)

Traditional (Intravascular) ICD

Subcutaneous ICD (S-ICD)
Advantages To The Subcutaneous ICD (S-ICD)

Disadvantages To The Subcutaneous ICD (S-ICD) (3)

ICDs In The Operating Room

Preventing Accidental Shock From An ICD During Surgery (2)
- One way to prevent accidental shock from an ICD during surgery is to disable the shock function of the ICD
–A pacemaker rep can do this by reprogramming the ICD prior to surgery, but the most common way we do this is to place a magnet over the ICD in the OR - The second way to prevent accidental shock from an ICD during surgery is to keep electrical current (i.e. cautery) away from the ICD
–One way to do this is to place the grounding plate as far away from the ICD as possible (at least 15cm)
–The other way to do this is for the surgeon to use an alternative to unipolar cautery (like bipolar cautery or a harmonic scalpel)

Advantages/disadvantages to a Harmonic Scalpel

Magnet Application On ICDs

Magnet Placement On An ICD

Clinical Management Of ICDs (2)


No shock. Bradycardia/possible asystole
- Put a magnet on
- Bipolar cautery or harmonic scapel
Pacemaker interrogation
How often should pacemakers and ICDs be checked?

Preop Management of CIEDs

What Anesthesia Should Know Preop (6)
- What type of device are we dealing with ? (pacemaker vs. ICD)
- What is the programmability of the device? (i.e., VOO, etc)
- What is the underlying rhythm? (why was the pacemaker placed?)
- Is the patient is pacemaker dependent?
- Does the pacemaker have rate modulation?
- Does the pacemaker capture effectively?
- What is the magnet response?
- Is there adequate battery life? (> 3-6 months)
- What are the manufacturer’s perioperative recommendations?
Intraoperative Management

Postop

CIED Algorithm


Yes she is pacemaker dependent.
- Call rep or put pacing pads on
- Bipolar cautery or harmonic scapel
- Transcutaneous pacing
Nothing, it will stop pacing and causing bradycardia or asystole

No he is not pacemaker dependent
Magnet placement will convert the pacemaker into asynchronous mode and increase HR
No a magnet should not be placed on this patient
Zero effect of cautery on his heart rate

Not required but dependent on the provider
Magnet placement would disable the shock function

Magnet placement will disable shock function and will not change EKG and still in demand mode
Yes, a magnet should be placed

Place magnet

Rep needs to activate asynchronous mode

Rate modulation was not disabled
1st Letter In The Pacemaker Classification Code

2nd Letter In The Pacemaker Classification Code

3rd Letter In The Pacemaker Classification Code

When The 3rd Letter Is “I”

When The 3rd Letter Is “T”

An Example Of Triggering
(When The 3rd Letter Is “T”)

When The 3rd Letter Is “D”

When The 3rd Letter Is “O”

4th (Programmability) & 5th Letters

AAI Pacing

AOO Pacing

VVI Pacing

VOO Pacing

DDD Pacing

DOO Pacing

VDD Pacing

MRI & CT Scans

Radiation Therapy

RF Ablation, Emergency Defibrillation

Transcutaneous Electrical Nerve Stimulation (TENS)

TENS & CIEDs

Electroconvulsive Therapy (ECT)


Cardiovascular & Cerebral Effects of ECT

Methohexital

Etomidate

Propofol

Ketamine

Airway Management For ECT

Neuromuscular Blocking Agents For ECT

CIED Implications For ECT (4)

Extracorporeal Wave (ESW) Lithotripsy

Synchronized Litho Shocks

Non-Synchronized Litho Shocks


CIEDs may interpret these the shocks the same way they interpret cautery. This could cause:


How does synchronized litho shocks can cause arrhythmias in atrially paced patients?
