. Clinical disorders of the heart beat : a handbook for practitioners and students . drawn on the curve. Systoles 2a, 4a, 5a, 6a and 7a do not affect the ventricle ;and where the ventricle is silent an unusually lengthy pause is found. Thearterial pause o is brief as compared with b because the auricular impulse4 takes longer to reach the ventricle than does impulse 5. Disturbanceof a 2 : 1 period is shown in Fig. 17. An early contraction of the ventricleis followed by a pulse pause a which is shorter than 6 and the succeedingpauses. The reason of this shortening has been explained in the desc
. Clinical disorders of the heart beat : a handbook for practitioners and students . drawn on the curve. Systoles 2a, 4a, 5a, 6a and 7a do not affect the ventricle ;and where the ventricle is silent an unusually lengthy pause is found. Thearterial pause o is brief as compared with b because the auricular impulse4 takes longer to reach the ventricle than does impulse 5. Disturbanceof a 2 : 1 period is shown in Fig. 17. An early contraction of the ventricleis followed by a pulse pause a which is shorter than 6 and the succeedingpauses. The reason of this shortening has been explained in the descriptionof the last figure. In Fig. 17 heart-block is also evidenced by the totalduration (c) of the two short beats, it is equal to one and a half times thatof the longer beats (period d). In other words c and d correspond to threeauricular cycles. 28 Chapter III. In mitral stenosis partial heart-block is often character-ised by peculiarities of the murmurs. They are oftenextremely complex. Where 2 : 1 heart-block is present twothrills and two diastolic murmurs may accompany each. Fig. 18. Arterial and apex curves from a case of mitral stenosis, while themechanism passes from a condition of dropped beats to 2 : 1 the arrangement of the diastolic murmurs and their dependenceupon those auricular contractions which force blood into the ventricle.
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