I. Findings: Normal

  1. PR Segment is Isoelectric
  2. Interval: 0.12 to 0.20

II. Causes: Prolonged PR Interval

  1. AV Node Block
  2. Hyperthyroidism (occasional)
  3. Normal variant (rarely)

III. Causes: Shortened PR Interval

  1. Wolf-Parkinson-White Syndrome (WPW Syndrome)
    1. Always look closely for a Delta Wave in Short PR Interval
  2. AV nodal rhythm (Junctional Rhythm)
  3. Low atrial nodal rhythm
  4. Lown-Ganong-Levine (LGL)
  5. Hypertension
  6. Normal variant

IV. Causes: PR Depression

  1. Myocardial Infarction involving atrium
  2. Acute Pericarditis (also with downsloping TP segment)

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Ontology: PR depression (C0429068)

Concepts Finding (T033)
SnomedCT 251245007
English PR depression, PR depression (finding)
Spanish depresión del PR (hallazgo), depresión del PR

Ontology: Prolonged PR interval (C0600125)

Definition (NCI) An electrocardiographic finding of a PR interval of more than 0.20 seconds in adults.
Concepts Finding (T033)
SnomedCT 367413009, 195041009, 142116006, 164947007, 14256006
English PR INTERVAL PROLONGED, Prolonged P-R interval, [dup] NOS, PR interval prolonged, PR prolongation, Prolonged P-R interval, NOS (finding), Electrocardiogram PR interval prolonged, Electrocardiogram PR prolongation, Prolonged P-R interval, NOS, Prolonged PR Interval by ECG Finding, Prolonged PR Interval by EKG Finding, Prolonged PR Interval, Prolonged PR interval, Prolonged P-R interval, Prolonged PR interval (finding), Prolonged P-R interval NOS, Prolonged P-R interval, NOS (disorder)
Italian Intervallo PR dell'elettrocardiogramma, prolungato, Intervallo PR allungato, Allungamento del PR
Dutch PR-interval verlengd, PR verlenging, elektrocardiogram PR-interval verlengd, elektrocardiogram PR-verlenging
French Prolongation de l'intervalle PR, Intervalle PR prolongé, Espace PR de l'électrocardiogramme prolongé, ALLONGEMENT DE L'INTERVALLE PR, Prolongation PR de l'électrocardiogramme
German PR-Intervall verlaengert, PR-Verlaengerung, Elekrokardiogramm: PR-Strecke verlaengert, PR-INTERVALL VERLAENGERT, Elektrokardiogramm-PR verlaengert
Portuguese Intervalo PR prolongado, Prolongamento de PR, Intervalo PR do ECG prolongado, ALONGAMENTO DO INTERVALO PR, Prolongamento PR do ECG
Spanish Prolongación de PR, Intervalo PR alargado, Prolongación del intervalo PR, intervalo P-R prolongado [dup] (trastorno), PR PROLONGADO, intervalo P-R prolongado [dup] (hallazgo), intervalo P - R prolongado, intervalo P-R prolongado [dup], P-R prolongado, intervalo P-R prolongado, intervalo PR prolongado (hallazgo), intervalo PR prolongado, Prolongación del intervalo PR del ECG
Japanese 心電図PR間隔延長, 心電図PR延長, PR間隔延長, PR延長, PRカンカクエンチョウ, シンデンズPRエンチョウ, シンデンズPRカンカクエンチョウ, PRエンチョウ
Czech PR interval prodloužený, Prodloužení PR intervalu, Prodloužení PR intervalu na elektrokardiogramu, PR interval na elektrokardiogramu prodloužený
Hungarian PR szakasz megnyúlt, PR megnyúlás, Elektrokardiogram PR megnyúlás, Elektrokardiogram PR távolság megnyúlt