Identify the telemetry rhythm strip below.

Choice A rationale

Third-degree AV block, also known as complete heart block, is characterized by a complete dissociation between atrial and ventricular activity, meaning P waves and QRS complexes occur independently without any consistent relationship. This rhythm does not exhibit such complete dissociation.

Choice B rationale

First-degree AV block is indicated by a prolonged PR interval (greater than 0.20 seconds) with every P wave followed by a QRS complex. The rhythm strip shows a progressive lengthening of the PR interval before a dropped QRS, which is not characteristic of first-degree block.

Choice C rationale

Second-degree AV block Mobitz type 1 (Wenckebach) is characterized by a progressive lengthening of the PR interval over several beats, eventually culminating in a P wave that is not followed by a QRS complex (a dropped beat), after which the cycle repeats. This is exactly what is shown in the telemetry strip.

Choice D rationale

Second-degree AV block Mobitz type 2 is characterized by a constant PR interval for conducted beats, but with intermittent dropped QRS complexes without prior PR interval prolongation. This differs from the progressive PR lengthening seen in the provided rhythm strip.

Choice A rationale

Migraine headaches are classically characterized by unilateral, throbbing pain, often preceded by a prodrome including photophobia (sensitivity to light) or phonophobia (sensitivity to sound), and have a strong genetic predisposition, frequently running in families.

Choice B rationale

Cluster headaches are typically characterized by severe, unilateral pain located around the eye or temple, often accompanied by autonomic symptoms like tearing or nasal congestion, but they are not commonly described as throbbing or associated with photophobia as a premonitory symptom.

Choice C rationale

Tension-type headaches are usually described as a bilateral, pressing or tightening sensation, often mild to moderate in intensity. They are generally not throbbing, unilateral, or associated with significant photophobia as a prominent premonitory symptom.

Choice D rationale

Frontal-type headaches are a descriptive localization of pain rather than a distinct headache type. While pain may be in the frontal region, this term does not encompass the specific clinical characteristics like throbbing nature, premonitory photophobia, and family history indicative of migraine.