Heart devices
CRT-D (resynchronization therapy) implantation
A device that makes the ventricles work in step in heart failure and protects against dangerous rhythms.
In heart failure the right and left ventricles may not contract at the same time, and this may worsen symptoms such as shortness of breath and weakness.
Cardiac resynchronization therapy (CRT) makes both ventricles work in step, so that each contraction is more effective. A CRT-D device also adds a defibrillator (ICD) function to this.
How a CRT-D is built
It makes both ventricles work in coordination and protects against dangerous rhythms.
- HousingA small metal part that holds the battery and the electronic circuit.
- Right atrial lead
- Right ventricular lead
- Left ventricular leadAn additional lead for the left ventricle.
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Difference between CRT-P and CRT-D
CRT-P
pacing only (a “biventricular pacemaker”).
CRT-D
three leads; stopping a dangerous ventricular rhythm is added to pacing.
The choice depends on the likelihood of a dangerous arrhythmia, and the doctor decides it.
02
Who may need it
People with heart failure with symptoms, when medicines have not been enough. According to the 2021 ESC recommendation, CRT is recommended with sinus rhythm, a left ventricular ejection fraction (the share of blood pumped out in one contraction) of 35 % or lower, a QRS width on the ECG of 150 ms or more and left bundle branch block (the signal reaches the left ventricle late). In other situations the doctor assesses the decision individually.
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Implantation and after
Implantation is similar to a pacemaker, but may take longer because an additional lead is placed for the left ventricle. The risk of infection is higher than with an ordinary pacemaker. The battery often runs out sooner than in an ordinary ICD, so follow-up is carried out regularly.
04
What to do after a shock
If you feel well after a single shock, check that you have not been injured, rest for a few hours and inform your doctor or the center where the device was implanted that day or the next. If there is more than one shock within 24 hours, contact your doctor or the center very quickly.
The exact procedure, price and preparation are agreed with the doctor or administrator at the appointment.
Emergency help (103): if there are several strong shocks within a short time, chest pain, shortness of breath or fainting after a shock, or a head injury while taking a blood thinner, do not wait, call 103.
Other services in this area
All servicesPacemaker and ICD: consultation and check-up
Is a device needed, which type is suitable, is the implanted one working correctly: an arrhythmologist’s advice and a device check.
Learn morePacemaker implantation
Single- and dual-chamber pacemakers used when the heart beats too slowly: assessing the indication, implantation and follow-up.
Learn moreICD (cardioverter-defibrillator) implantation
A device that stops life-threatening ventricular rhythms: assessing who needs it, implantation and follow-up.
Learn more
Book this service
CRT-D (resynchronization therapy) implantation
+998 97 490 86 75Specialist
Sherzod Nasirovich Sabirov