Influence of Patient Position on Attenuation Artifacts Observed in D-SPECT Camera Myocardial Tomoscintigraphy (D-SPECT BIKER)

Central Hospital, Nancy, France

Status: Unknown

Conditions: Patient Position; Myocardial Tomoscintigraphy; Attenuation Artifact

Treatments: Procedure: Rest tomoscintigraphy in dorsal decubitus position; Procedure: Rest tomoscintigraphy in semi sitting position; Procedure: Rest tomoscintigraphy in forward tilted

Study type: Interventional

Funder types: Other

Identifiers

NCT02872545

2016-A00378-43

Details and patient eligibility

About

The purpose is to compare percentages of myocardial segments showing attenuation in patients in forward tilted position (biker position) or 2 conventional positions (dorsal decubitus or semi sitting) at acquisition with D-SPECT camera in myocardial tomoscintigraphy.

The hypothesis is that the percentage of myocardial segments with attenuation is significantly lower when acquisitions are made in forward tilted position (biker position).

The secondary purpose is to restrict this analysis to 3 cardiac regions most subject to attenuation artifacts (anterior, apical and inferobasal regions).

Full description

Myocardial perfusion tomoscintigraphy is a very used technique for diagnosis and characterization of abnormalities of stress and rest myocardial perfusion (ischemia, infarction).

A common problem is attenuation artifacts that are due to tissue interposition attenuating radiation from some cardiac regions. These artifacts originate activity decreasing and thus perfusion abnormalities potentially in all walls of left ventricle, especially the inferior wall in men (attenuation by sub-diaphragmatic organs) and the anterior wall in women (attenuation by mammary glands). These artifacts are observed in rest and stress acquisitions and can lead to a wrong diagnosis of infarction.

Attenuation artifacts can be identified with analysis of contraction kinetics with "gated-SPECT" (normal kinetics and thus discordant with aspect of infarction). With D-SPECT camera some artifacts can be prevented with a 30-35° forward tilted position of acquisition. This position, also called biker position, can take cardiac area away from sub-diaphragmatic structures. It can also reduce the distance between heart and detection surface of camera and limit respiratory movements of thoracic wall.

In this study, patients with abnormal results at stress myocardial perfusion tomoscintigraphy will undergo a rest tomoscintigraphy. Acquisition will be done in forward tilted position and in one of 2 other positions: dorsal decubitus or semi sitting.

Enrollment: 80 estimated patients

Sex: All

Ages: 18+ years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Affiliation to social security
• Signed informed consent
• Previous clinical examination authorizing patient to undergo tomoscintigraphy
• Patient with abnormal results of stress tomoscintigraphy and needing a rest tomoscintigraphy
• Patient with sinus and regular cardiac rhythm
• Patient with stable clinical status (without signs of unstable cardiac or coronary failure, without uncontrolled hypertension under treatment)

Exclusion criteria

• Women of childbearing potential without effective contraception
• Evolutive pregnancy
• Breastfeeding patient
• Contraindication to tomoscintigraphy
• Patient with history of hypersensibility to tomography radiotracer STAMICIS® or one of components
• Patient in life-and-death emergency
• Patient with history of disorders possibly interfering with contractility
• Patient with normal results of stress tomoscintigraphy
• Person under legal protection or incapable to consent
• Person deprived of liberty by judicial or administrative decision

Trial design

Primary purpose: Diagnostic

Allocation: Non-Randomized

Interventional model: Crossover Assignment

Masking: None (Open label)

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80 participants in 3 patient groups

forward tilted

Experimental group

Description:

Patients with abnormal results at stress myocardial perfusion tomoscintigraphy will undergo a rest tomoscintigraphy. Acquisition will be done in forward tilted position

Treatment:

Procedure: Rest tomoscintigraphy in dorsal decubitus position

Procedure: Rest tomoscintigraphy in semi sitting position

Procedure: Rest tomoscintigraphy in forward tilted

semi sitting

Other group

Description:

Patients with abnormal results at stress myocardial perfusion tomoscintigraphy will undergo a rest tomoscintigraphy. Acquisition will be done in semi sitting

Treatment:

Procedure: Rest tomoscintigraphy in semi sitting position

Procedure: Rest tomoscintigraphy in forward tilted

dorsal decubitus

Other group

Description:

Patients with abnormal results at stress myocardial perfusion tomoscintigraphy will undergo a rest tomoscintigraphy. Acquisition will be done in dorsal decubitus

Treatment:

Procedure: Rest tomoscintigraphy in dorsal decubitus position

Procedure: Rest tomoscintigraphy in forward tilted