* Electrocardiographic J waves are associated with right ventricular morphology and function: evaluation by cardiac magnetic resonance imaging.
- We assessed the relationship between J waves and the ventricular morphology and function using cardiac magnetic resonance imaging (MRI). The 12-lead electrocardiograms (ECGs) of 105 consecutive patients who underwent cardiac MRI were reviewed, and those with signs of arrhythmogenic right ventricular cardiomyopathy, complete left bundle branch block, complete right bundle branch block, or chronic atrial fibrillation, where the J wave is difficult to distinguish, were excluded. The ECGs of the remaining 68 patients were analyzed for the presence of J waves. Ventricular morphologic abnormalities were identified on MRI, based on the largest short-axis diameter in the right and left ventricles (d-RVmax/d-LVmax), the area (a-RVmax/a-LVmax), and the ratio RV/LVmax. The percentage contraction of the RV (PC-RV) was used as a measure of ventricular function. Thirty-two patients (47.0 %) had J waves defined as QRS-ST junction elevation >0.1 mV from baseline in the inferior/lateral leads (J group; 56 ± 15 years; 19 males). Thirty-six patients (53.0 %) did not present J waves (NJ group; 58 ± 15 years; 27 males). The d-RVmax and a-RVmax in the J group were larger than those in the NJ group (41 ± 5.2 vs 36 ± 6.6 mm, P = 0.002 and 14 ± 2.9 vs 12 ± 3.4 cm(2), P = 0.022, respectively). The RV/LVmax ratio in the J group was larger than that in the NJ group (0.83 ± 0.15 vs 0.68 ± 0.15, P < 0.001). The PC-RV in the J group was smaller than that in the NJ group (0.28 ± 0.14 vs 0.36 ± 0.15, P = 0.013). J-wave amplitude was correlated positively with d-RVmax (P = 0.010) and negatively with PC-RV (P = 0.005). These results suggested that J waves are associated with right ventricular morphologic and functional abnormalities.
=>1.機能, 関数, 役割, 働き, 2.機能する, 作用する, 働く, 役目を果たす, 3.社交的会合, パーティー, 儀式
Overview of noun function
The noun function has 7 senses (first 3 from tagged texts)
1. (43) function, mathematical function, single-valued function, map, mapping -- ((mathematics) a
mathematical relation such that each element of a given set (the domain of the function) is
associated with an element of another set (the range of the function))
2. (24) function, purpose, role, use -- (what something is used for; "the function of an auger is to
bore holes"; "ballet is beautiful but what use is it?")
3. (7) function, office, part, role -- (the actions and activities assigned to or required or
expected of a person or group; "the function of a teacher"; "the government must do its part"; "play
its role")
4. function -- (a relation such that one thing is dependent on another; "height is a function of
age"; "price is a function of supply and demand")
5. function -- (a formal or official social gathering or ceremony; "it was a black-tie function")
6. affair, occasion, social occasion, function, social function -- (a vaguely specified social
event; "the party was quite an affair"; "an occasion arranged to honor the president"; "a seemingly
endless round of social functions")
7. routine, subroutine, subprogram, procedure, function -- (a set sequence of steps, part of larger
computer program)
Overview of verb function
The verb function has 3 senses (first 3 from tagged texts)
1. (9) function, work, operate, go, run -- (perform as expected when applied; "The washing machine
won't go unless it's plugged in"; "Does this old car still run well?"; "This old radio doesn't work
anymore")
2. (3) serve, function -- (serve a purpose, role, or function; "The tree stump serves as a table";
"The female students served as a control group"; "This table would serve very well"; "His freedom
served him well"; "The table functions as a desk")
3. (1) officiate, function -- (perform duties attached to a particular office or place or function;
"His wife officiated as his private secretary")
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