What is the significance of monitoring EEG and ECG?

Monitoring EEG and ECG allows researchers to assess the neurological and cardiac effects of the drug simultaneously.

How is the arrhythmia-inducing drug administered?

The drug is mixed with food-grade applesauce and administered via an oral syringe.

What parameters are monitored during the experiment?

Vital parameters include EEG, ECG, oxygen saturation, and breathing patterns.

Why use rabbits for this type of study?

Rabbits are suitable model organisms due to their physiological similarities to humans in cardiovascular studies.

What are the potential applications of this research?

This research can help in understanding drug effects on cardiac function and developing treatments for arrhythmias.

How long is the monitoring period after drug administration?

Monitoring is conducted for two hours post-administration to capture the drug's effects.

Multisystem Monitoring in Rabbit Model: A Method to Assess Neuro-Cardiac and Respiratory Parameters to Study the Oral Drug-induced Triggers for Arrhythmia and Seizures

JoVE Encyclopedia of Experiments

Biology

0 views • 2:45 min • July 8th, 2025

$$\rightleftharpoonup{xx}$$ $$\longleftharp{xx}$$, $$\longrightharp{xx}$$,

Begin with a healthy experimental rabbit placed in a restrainer. Connect the electroencephalogram or EEG electrodes over the rabbit's scalp to record real-time brain activity. Similarly, connect electrocardiogram or ECG electrodes over the rabbit's chest and limbs to record heart functioning.

Next, attach an oximeter over the rabbit's ear and a capnograph mask over its nose and mouth. The oximeter and capnograph help monitor oxygen saturation levels and breathing patterns, respectively.

Now, take an oral syringe containing animal feed supplemented with an arrhythmia-inducing drug. Remove the capnograph mask and inject the feed into the rabbit's mouth. Then, reposition the mask. Allow the drug to circulate into the rabbit's body for an optimum duration.

The drug molecules bind to specialized potassium channels in the heart and restrict the passage of potassium ions. This results in an extended interval between heart contraction and relaxation, leading to cardiac arrhythmia. Subsequently, monitor the vital parameters for neurological and cardiorespiratory functions.

Record a prolonged QT variant for arrhythmia in ECG, coinciding seizure waves in EEG, abnormal oxygen saturation levels in oximeter, and irregular breathing patterns in capnograph.

Before administering the medication, collect 10 to 20 minutes of baseline EEG-ECG-video from the untreated rabbit as demonstrated. For the oral administration of a medication of interest, mix 0.3 milligrams per kilogram of the drug of interest in three milliliters of food-grade applesauce and load the mixture into a three-milliliter oral syringe.

Gently lifting the upper lip of the rabbit, slide the tip of the syringe into the side of the mouth that is unobstructed by the rabbit's teeth, and inject the entire volume of drug-supplemented applesauce into the rabbit's mouth. Then, collect two hours of EEG-ECG-video data before returning the rabbit to its home cage for routine care.