title: Limited clinical utility of Holter monitoring in patients with palpitations or altered consciousness: analysis of 8973 recordings in 7394 patients.
abstract: OBJECTIVE
  To determine the clinical utility of 24 hour Holter monitoring by measuring the frequency of candidate arrhythmias recorded during the investigation of palpitations and altered consciousness.
  
  
  METHODS
  Of 9,729 Holter recordings, reports were available in 8,973 (92.2%) performed in the 7394 patients who comprise the study group. The mean age of the study group was 66 +/- 19 years and 56.4% were women.
  
  
  RESULTS
  The most common indications were altered consciousness (41.7%) and palpitations (36.2%). Among patients with palpitations and sinus rhythm (n=2688), recordings were normal in 2247 (83.6%). Abnormalities included paroxysmal atrial fibrillation (PAF, 6.6%), narrow complex tachycardia (NCT, 2.8%) nonsustained or sustained ventricular tachycardia (NSVT/VT, 2.6%). Among patients with altered consciousness (n=3075), recordings were normal in 2589 (84.2%). Abnormalities included PAF (9.5%), NCT (2.6%), NSV/VT (0.2%), pause >2.8s (2.2%) and high degree AV block (1.3%). The diagnostic yield of Holter monitoring was particularly low in patients aged < or =50 years, of whom 93.1% had palpitations and 95.3% had altered consciousness had normal recordings.
  
  
  CONCLUSIONS
  The diagnostic utility of Holter monitoring in patients being investigated for palpitations and altered consciousness is very limited, particularly in young patients for whom alternative diagnostic methods should be considered.
authors.affiliation: Newham University Hospital, London, United Kingdom. sreekumar.sufi@newhamhealth.nhs.uk
authors.forename: Sreekumar
authors.initials: S
authors.lastname: Sulfi
authors.forename: Dauda
authors.initials: D
authors.lastname: Balami
authors.forename: Neha
authors.initials: N
authors.lastname: Sekhri
authors.forename: Abdel
authors.initials: A
authors.lastname: Suliman
authors.forename: Akhil
authors.initials: A
authors.lastname: Kapur
authors.forename: R Andrew
authors.initials: RA
authors.lastname: Archbold
authors.forename: Kulasegaram
authors.initials: K
authors.lastname: Ranjadayalan
authors.forename: Adam D
authors.initials: AD
authors.lastname: Timmis
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D001145:Arrhythmias, Cardiac / Q000175:diagnosis*; D001281:Atrial Fibrillation / Q000175:diagnosis; D015331:Cohort Studies; D003244:Consciousness Disorders / Q000175:diagnosis* / Q000209:etiology; D015716:Electrocardiography, Ambulatory / Q000379:methods* / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D015203:Reproducibility of Results; D013610:Tachycardia / Q000175:diagnosis; D017180:Tachycardia, Ventricular / Q000175:diagnosis