Key result
During a cold pressor test, changes in pressure-rate product and coronary flow velocity were correlated in controls (r=0.58), obese patients (r=0.75), and diabetics without coronary stenosis (r=0.56).
Why the study?
Does transthoracic Doppler during a cold pressor test detect coronary microcirculation abnormalities in asymptomatic patients with type 2 diabetes?
Observational (n=93)
Does transthoracic Doppler during a cold pressor test detect coronary microcirculation abnormalities in asymptomatic patients with type 2 diabetes?
Transthoracic coronary Doppler during a cold pressor test can noninvasively identify coronary microcirculation mismatch in asymptomatic type 2 diabetic patients with coronary stenosis or left ventricular hypertrophy.
Answers are grounded in this paper and cite their sources.
Noninvasive CPT-based coronary microcirculation assessment appears feasible in diabetes; leaves open diagnostic utility pending larger validation studies.
BACKGROUND: The aims of this study were to noninvasively (i) assess the coronary microcirculation changes in response to a cold pressor test (CPT) in control subjects, nondiabetic obese patients and patients with type 2 diabetes and (ii) investigate the response of the coronary microcirculation in patients with diabetes according to the presence or the absence of silent myocardial ischaemia (SMI), asymptomatic coronary stenosis (CS) and left ventricle hypertrophy (LVH). METHODS: The mean left anterior descending coronary flow velocity (mCFV) was measured using transthoracic Doppler before and after a CPT in 16 control subjects, 11 obese and 66 asymptomatic diabetic patients with a high cardiovascular risk. Patients with diabetes were screened for SMI using stress myocardial scintigraphy and/or echocardiography. A coronary angiography was performed in those with SMI. RESULTS: At baseline, pressure-rate product (PRP) was correlated with mCFV (r = 0.23; P < 0.05) and left ventricle mass (r = 0.26; P < 0.05) in the whole population. Changes in PRP and mCFV during CPT were correlated with controls (r = 0.58, P < 0.05), obese (r = 0.75, P < 0.01) and diabetic patients without CS (r = 0.56, P < 0.0001) or without LVH (r = 0.63, P < 0.05) but not in diabetic patients with CS or with LVH. In patients with diabetes, SMI was associated with mCFV changes, independent of other parameters (P < 0.05). CONCLUSION: Transthoracic coronary Doppler allows noninvasive study of changes in the coronary microcirculation during CPT. In asymptomatic patients with type 2 diabetes, this method showed that SMI was associated with mCFV changes during CPT and the presence of CS or LVH was associated with a mismatch between coronary microcirculation and myocardial oxygen demand.
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Pham et al. (2014) conducted an observational in Type 2 diabetes and obesity (n=93). Cold pressor test vs. Control subjects was evaluated on Changes in pressure-rate product and mean coronary flow velocity during cold pressor test (p=<0.05). During a cold pressor test, changes in pressure-rate product and coronary flow velocity were correlated in controls (r=0.58), obese patients (r=0.75), and diabetics without coronary stenosis (r=0.56).
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