Welcome to PICU Doc On Call, A Podcast Dedicated to Current and Aspiring Intensivists.

I'm Pradip Kamat coming to you from Children’s Healthcare of Atlanta/Emory University School of Medicine and I'm Rahul Damania from Cleveland Clinic Children’s Hospital. We are two Pediatric ICU physicians passionate about all things MED-ED in the PICU. PICU Doc on Call focuses on interesting PICU cases & management in the acute care pediatric setting so let’s get into our episode:

Welcome to our Episode: A Somnolent Toddler.

Here's the case:

A 2 yo M presents to the PICU after being found increasingly sleepy throughout the day. The toddler is otherwise previously healthy and was noted to be in his normal state of health prior to today. The mother dropped the toddler off at his Grandmother’s home early this morning. Grandmother states that he was playing throughout the day, and she noticed around lunchtime the toddler stumbles around and acts more sleepy. She states that this was around his nap time so she did not feel it was too out of the ordinary. The toddler 1 hr later was still very sleepy, and the grandmother noticed that the toddler had some shallow breathing. She called mother very concerned as she also found her purse open where she typically keeps her pills. The grandmother has a history of MI and afib as well as hypertension. She is prescribed a multitude of medications. Given the child’s increased lethargy, the grandmother presents the patient to the ED. In the ED, the child is noted to be afebrile with HR 55 & RR of 18. His blood pressure is 78/40. On exam he has minimal reactivity to his pupils, he has shallow breathing and laying still on the bed. A POC glucose is 68 mg/dL. Acute resuscitation is begun and the patient presents to the PICU.

To summarize key elements from this case, this patient has:

Drowsiness
Bradycardia
Normotension
This is in the setting of being at grandma’s home and having access to many medications
Given the hemodynamic findings and CNS obtundation, this patient’s presentation brings up concern for a clonidine or beta-blocker ingestion.
This episode will be organized:
Beta-Blocker poisoning
We will also examine other medications that potentially can be toxic to a toddler (one pill can kill) present in Grandma's purse which include: TCA, CCB, Opioids, oral anti-diabetic agents, digoxin, etc.

The presence of a grandparent is a risk factor for unintentional pediatric exposure to pharmaceuticals commonly referred to as the Granny Syndrome. Grandparents’ medications account for 10% to 20% of unintentional pediatric intoxications in the United States. To kids, all pills look like candy.

Let’s start with a multiple choice.
An overdose of which of the following medications may mimic the presentation of Metoprolol overdose?
A. Verapamil toxicity
B. Ketamine toxicity
C. Valium toxicity
D. Lithium toxicity

The correct answer is A, verapamil toxicity.

Verapamil is a non DHP CCB.
It acts at the level of the SA and AV node similar to Metoprolol, a beta-1-specific antagonist.
Both cause bradycardia and AV node block.
Valium though a CNS depressant, can cause CV depression as well, however, would have fewer changes on the conduction system compared to a non-DHP CCB.

What is the mechanism of toxicity with beta-blockers?

Beta-blockers are competitive inhibitors at beta-adrenergic binding sites, which results in decreased production of intracellular cyclic adenosine monophosphate (cAMP) with a resultant blunting of multiple metabolic and cardiovascular effects of circulating catecholamines.

They attenuate the effect of adrenergic catecholamines on the heart
Decrease inotropic and chronotropic...