When to start mechanical pacing or cardiac monitoring?

When to start mechanical pacing or cardiac monitoring?

Electrical capture usually occurs when the current delivered is in the range of 50-100mA (Resuscitation Council UK, 2000) (Fig 6). Check the patient’s pulse. If there is a palpable pulse (mechanical capture), request expert help and prepare for transvenous pacing. If there is no pulse, start CPR.

What happens to electrical impulses after arrival at AV node?

After arriving at the AV node, the electrical impulse is then conducted down to the ventricles through the bundle of His, right and left bundle branches and Purkinje fibres, causing ventricular depolarisation and contraction (QRS complex).

What should the external pacing rate be on a defibrillator?

Select demand mode on the pacing unit on the defibrillator. Select an appropriate rate for external pacing, usually 60-90 per minute (Fig 5).

Do you check for P waves on ECG?

Ventricular standstill – P waves (atrial contraction) only on the ECG. Note that although pacing is not indicated in asystole, always carefully check the ECG for the presence of P waves (ventricular standstill) as this may respond to pacing (Nolan et al, 2005).

What is the duration of the P wave?

the P wave is peaked and has a normal duration. The P wave in V1 is biphasic, with no increase in the upslope of. the first deflection. (4) The PR interval spans approximately three small boxes (0.12 seconds), indicating a sinus rhythm. (5) The QRS complex spans fewer than three small boxes, which is normal.

How is the P wave related to atrial enlargement?

This results in a biphasic P wave, in which the first peak represents depolarization of the right atrium and the second peak represents depolarization of the left atrium, allowing for easy differentiation between the atria. Right atrial enlargement (RAE)leads to delayed activation of the right atrium. This

How tall is the Your Wave in an ECG?

That overall QRS voltage is relatively low. Criteria for “low voltage” are not met — because QRS amplitude is not ≤5mm in all 6 limb leads (ie, the R wave in ECG #1 is 6mm tall in lead II — and it is 7mm tall in lead I of ECG #2). However, QRS amplitude is relatively reduced in both limb leads and chest leads in both tracings.

What’s the normal interval between the P wave and QRS complex?

A normal PR interval ranges between 0.12 seconds to 0.22 seconds. The flat line between the end of the P-wave and the onset of the QRS complex is called the PR segment and it reflects the slow impulse conduction through the atrioventricular node.