TY - JOUR
T1 - Left and right ventricular pressure diameter relationships during ventricular standstill in the dog
AU - Mashiro, Iwao
AU - Mitsunami, Kenichi
AU - Kinoshita, Masahiko
AU - Kawakita, Seiichi
AU - Yamazaki, Gyozan
AU - Heckel, Richard R.
AU - Franciosa, Jaseph A.
AU - Cohn, Jay N
PY - 1982/1
Y1 - 1982/1
N2 - It has been assumed that ventricular standstill induces left ventricular dilation because filling continues without emptying. Left and right ventricular diameters by echocardiography and pressures were monitored continuously in 21 intact dogs before and during ventricular standstill induced by coronary embolization (E), potassium infusion (K+), or calcium infusion (Ca++) in 7 dogs respectively. At the onset of ventricular standstill, left ventricular pressure rose from an end-diastolic of 4.6 ± 2.2 to 16.6 ±3.6 mmHg after E, 5.4 ± 3.2 to 18.0 ± 3.3 mmHg after K+, and 6.3 ± 2.1 to 16.6 ± 3.6 mmHg after Ca++ (all p< 0.001). Left ventricular dimension rose from an end-diastolic of 44.6 ± 8.0 to 49.4 ± 8.5 mm after E, 43.1 ± 5.1 to 46.3 ± 4.6 mm after K+ but fell from 40.6 ± 5.1 to 33.9 ± 3.4 mm after Ca++ before ventricular standstill occurred. During the first 5 min of ventricular standstill, left ventricular pressure gradually fell from 16.6 ± 3.6 to 5.4 ± 1.1 mmHg (E), 18.0 ± 3.3 to 5.9 ± 2.0 (K+), 16.6 ± 3.6 to 6.6 ± 1.7 (Ca++) (all p < 0.001) while left ventricular diameter gradually fell to 40.7 ± 7.0 mm (E), 35.0 ± 5.1 (K+), 29.6 ± 3.6 (Ca++) (all p < 0.001). Right ventricular pressure initially rose from 2.9 ± 1.6 mmHg to 12.1 ± 3.1 (E), from 2.7 ± 1.3 to 12.0 ± 2.0 (K+), from 2.7 + 1.0 to 12.6 ± 2.6 (Ca++) within 15 sec, then gradually fell to 6.6 ± 1.1 (E), 6.1 ± 1.9 (K+), and 7.9 + 1.8 (Ca++) in 5 min whereas right ventricular diameter rose progressively from 4.4 ± 3.0 mm to 21.0 ± 1.7 (E), 4.7 ± 2.6 to 20.3 ± 1.3 (K+), 4.2 ± 1.1 to 18.1±2.8 (Ca++) in 60 sec (all p < 0.001). Thus ventricular standstill is characterized by early left ventricular emptying and inhibited left ventricular filling despite continued right ventricular filling, a finding that might reflect the different intrinsic properties of the two ventricles.
AB - It has been assumed that ventricular standstill induces left ventricular dilation because filling continues without emptying. Left and right ventricular diameters by echocardiography and pressures were monitored continuously in 21 intact dogs before and during ventricular standstill induced by coronary embolization (E), potassium infusion (K+), or calcium infusion (Ca++) in 7 dogs respectively. At the onset of ventricular standstill, left ventricular pressure rose from an end-diastolic of 4.6 ± 2.2 to 16.6 ±3.6 mmHg after E, 5.4 ± 3.2 to 18.0 ± 3.3 mmHg after K+, and 6.3 ± 2.1 to 16.6 ± 3.6 mmHg after Ca++ (all p< 0.001). Left ventricular dimension rose from an end-diastolic of 44.6 ± 8.0 to 49.4 ± 8.5 mm after E, 43.1 ± 5.1 to 46.3 ± 4.6 mm after K+ but fell from 40.6 ± 5.1 to 33.9 ± 3.4 mm after Ca++ before ventricular standstill occurred. During the first 5 min of ventricular standstill, left ventricular pressure gradually fell from 16.6 ± 3.6 to 5.4 ± 1.1 mmHg (E), 18.0 ± 3.3 to 5.9 ± 2.0 (K+), 16.6 ± 3.6 to 6.6 ± 1.7 (Ca++) (all p < 0.001) while left ventricular diameter gradually fell to 40.7 ± 7.0 mm (E), 35.0 ± 5.1 (K+), 29.6 ± 3.6 (Ca++) (all p < 0.001). Right ventricular pressure initially rose from 2.9 ± 1.6 mmHg to 12.1 ± 3.1 (E), from 2.7 ± 1.3 to 12.0 ± 2.0 (K+), from 2.7 + 1.0 to 12.6 ± 2.6 (Ca++) within 15 sec, then gradually fell to 6.6 ± 1.1 (E), 6.1 ± 1.9 (K+), and 7.9 + 1.8 (Ca++) in 5 min whereas right ventricular diameter rose progressively from 4.4 ± 3.0 mm to 21.0 ± 1.7 (E), 4.7 ± 2.6 to 20.3 ± 1.3 (K+), 4.2 ± 1.1 to 18.1±2.8 (Ca++) in 60 sec (all p < 0.001). Thus ventricular standstill is characterized by early left ventricular emptying and inhibited left ventricular filling despite continued right ventricular filling, a finding that might reflect the different intrinsic properties of the two ventricles.
KW - Echocardiography
KW - Pressure and diameter
KW - Right and left ventricle
KW - Ventricular standstill
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U2 - 10.1253/jcj.46.284
DO - 10.1253/jcj.46.284
M3 - Article
C2 - 7062557
AN - SCOPUS:0019965971
SN - 0047-1828
VL - 46
SP - 284
EP - 295
JO - JAPANESE CIRCULATION JOURNAL
JF - JAPANESE CIRCULATION JOURNAL
IS - 3
ER -