Heart tones / Kardiologie - Economy-point.org

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Page modified: Saturday, June 24, 2006 09:16:07

When one designates heart tones the audible oscillations developing during the heart action (15-400 cycles per second), which will transfer to the thorax wall. With presented ear or the Stethoskop two of the four heart tones are perceptible (Auskultation).

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The 1. Heart clay/tone is dull and lasts 0.14 S. it comes off by the fact that the chamber musculature contracts itself with the conclusion of the Atrioventrikularklappen around the incompressible blood ("muscle strain clay/tone"). It is best over the heart point to hear.

The 2. Heart clay/tone is more brightly, louder and lasts more briefly (0.11 s) than the 1. Heart clay/tone. It develops with the conclusion of the pocket flaps of Aorta and Arteria pulmonalis ("flap conclusion clay/tone"). It is best over the heart basis to hear.

There is school book teachings, which mean that the first heart clay/tone (Kontraktur of the chamber musculature and locking of the Mitral, as well as Trikuspidalklappen) is louder i.d.Regel than the second heart clay/tone (Kontraktur of the forecourt musculature and locking of the Aorten and Pulmonalklappen). This is also logical, because the chamber musculature possesses the stronger contractible force, since it discharges the blood into the large and/or small cycle.

Physiological ("normal") heart tones

In the Phonokardiogramm 4 heart tones can be differentiated:

I. Heart clay/tone in the strain phase of the heart (R-S distance in the ELECTROCARDIOGRAM)
II. Heart clay/tone when closing the pocket flaps of the two Arterien of the heart (short after the T-wave in the ELECTROCARDIOGRAM)
III. Heart clay/tone in the early filling phase by the blood flowing in into the Herzkammer (falls in the front third of the TP-distance in the ELECTROCARDIOGRAM)
IV. Heart clay/tone, which is to be found only occasionally as clay/tone of the forecourt contraction (briefly after the P-wave in the ELECTROCARDIOGRAM).

Pathological ("diseased") heart noises

Even if noises are added to the heart tones, these refer contrary to the heart tones usually to pathological ("diseased") changes of the Herzklappen. So for example a heart noise is to be mostly attributed during the Systole (the operating phase of the heart) to a Stenose (narrowing) of the pocket flaps or an insufficiency (leakage) of the sail flaps, a diastolic noise (during the dwell phase of the heart) against it usually to leaky pocket flaps or narrowed sail flaps.