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Safety and feasibility of atropine added in patients with sub-maximal heart rate during exercise myocardial perfusion SPECT

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Abstract

Background

Failure to reach 80% of maximal predicted heart rate (HR) during exercise may render a myocardial perfusion single photon emission computed tomography (SPECT) study non-diagnostic for ischemia detection. We sought to investigate the injection of atropine in patients who fail to achieve 80% of age-predicted HR during exercise performed for myocardial perfusion SPECT (MPS), defining its safety and efficacy to raise HR to adequate levels as well as its effect on MPS interpretation.

Methods and results

Between January 2002 and December 2004, we studied 3,150 consecutive patients (2,253 men and 897 women, mean age 55 ± 6 years) who were referred to a single office-based nuclear cardiology laboratory for MPS using SPECT imaging. One milligram of atropine was administered to patients that were unable to continue because of fatigue before reaching minimal HR, without an ischemic response (group A, n = 397). The scintigraphic results for group A were compared with those of patients who spontaneously achieved target HR (group B, n = 2,753). In group A, mean HR before atropine injection was 119.5 ± 13.6 beats per minute (bpm), and it increased up to 137.3 ± 13.5 bpm after drug administration, with an incremental of 17.8 ± 6.9 bpm (P < 0.0001). The mean percentage of age-related HR achieved in this group was 83.5 ± 8.1%. In 302 of this patients (76.1%) more than 80% of their aged-related HR (86.9 ± 5.1%) was attained. No major adverse effects occurred. When groups A and B were compared, baseline and peak HR, rate pressure product, and maximal metabolic equivalents achieved were higher in group B. There were no significant differences in the percentage of total positive perfusion studies between both groups: 210/397 patients (52.9%) in group A and 1,342/2,753 patients (48.7%) in group B (P = 0.39). Ischemia or ischemia plus scar was found in 112/397 patients (28.2%) in group A and in 923/2,753 patients (33.5%) of group B (P = 0.14).

Conclusion

Atropine added to exercise stress testing in patients who cannot achieve their 80% age-related HR is a safe, well-tolerated, and feasible method for MPS.

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Authors and Affiliations

  1. Division of Cardiology, Buccheri La Ferla Fatebenefratelli Hospital, Via Salvatore Puglisi n.15, 90143, Palermo, Italy

    Filippo Maria Sarullo, Andrea Taormina, Vincenzo Azzarello & Annamaria Martino

  2. Division of Cardiology, Civico e Benfratelli Hospital, Palermo, Italy

    Corrado Ventimiglia

  3. Nuclear Cardiology Service, Civico and Benfratelli Hospital, Palermo, Italy

    Filippo Felice

  4. Department of Internal Medicine, University of Palermo, Palermo, Italy

    Salvatore Paterna

  5. Division of Cardiology “Paolo Borsellino”, G.F. Ingrassia Hospital, Palermo, Italy

    Pietro Di Pasquale

Authors
  1. Filippo Maria Sarullo
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  2. Corrado Ventimiglia
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  3. Andrea Taormina
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Correspondence to Filippo Maria Sarullo.

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Sarullo, F.M., Ventimiglia, C., Taormina, A. et al. Safety and feasibility of atropine added in patients with sub-maximal heart rate during exercise myocardial perfusion SPECT. Int J Cardiovasc Imaging 23, 511–518 (2007). https://doi.org/10.1007/s10554-006-9169-5

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  • DOI: https://doi.org/10.1007/s10554-006-9169-5

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