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Rocky Mountain Spotted Fever

Rocky Mountain Spotted Fever (RMSF) is a severe tick-borne illness caused by Rickettsia rickettsii, a Gram-negative, coccobacillary bacterium. This pathogen is an obligate intracellular parasite, requiring a host cell for replication. Transmission occurs through the bite of an infected tick. In the United States, the most important vectors are Dermacentor variabilis (American dog tick) and Dermacentor andersoni (Rocky Mountain wood tick), though other tick species may also serve as vectors.
Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

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Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

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Related Experiment Video

Updated: Jul 11, 2026

A Model for Experimental Exposure of Humans to Larval Ixodes scapularis Ticks
04:47

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Published on: December 1, 2023

[Total atrioventricular block following a tick bite].

R J A M Verbunt1, R F Visser

  • 1Máxima Medisch Centrum, Postbus 7777, 5500 MB Veldhoven. r.verbunt@mmc.nl

Nederlands Tijdschrift Voor Geneeskunde
|October 3, 2007
PubMed
Summary

Lyme carditis, a tick-borne illness, can cause heart rhythm problems like atrioventricular block. Prompt antibiotic treatment can reverse these cardiac issues, potentially avoiding permanent pacemaker implantation.

Area of Science:

  • Cardiology
  • Infectious Diseases
  • Tick-borne Illnesses

Background:

  • Lyme disease, caused by Borrelia bacteria, can affect cardiac function.
  • Delayed diagnosis and treatment may lead to persistent cardiac complications.

Observation:

  • A 40-year-old male presented with symptoms of dizziness, palpitations, and shortness of breath.
  • A history of a tick bite years prior was noted, without a characteristic rash.
  • Electrocardiogram (ECG) revealed first-degree atrioventricular (AV) block, with ambulatory monitoring showing intermittent complete AV block.

Findings:

  • Antibodies to Borrelia confirmed Lyme disease.
  • The patient received ceftriaxone treatment and a temporary pacemaker.
  • Complete resolution of AV block occurred within months, leading to pacemaker explantation.

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Implications:

  • This case highlights the potential reversibility of Lyme carditis-induced AV block.
  • Early diagnosis and antibiotic treatment are crucial for managing cardiac manifestations of Lyme disease.
  • Avoiding permanent pacemaker implantation is possible with timely intervention.